Merge branch 'feature/10.0' of http://cloud.finedevelop.com:2015/scm/~kerry/base-third into feature/10.0

build.third_step1.gradle

@@ -17,7 +17,7 @@ def srcDir="."
 
 
 task unJar{
-	ant{	
+	ant{
 		delete(dir:"build")
 	}
 }
@@ -30,7 +30,10 @@ sourceSets{
 			srcDirs=[
 				"${srcDir}/fine-poi/src",
 				"${srcDir}/fine-quartz/src",
-				"${srcDir}/fine-commons-io/src"
+				"${srcDir}/fine-commons-io/src",
+				"${srcDir}/fine-commons-fileupload/src",
+				"${srcDir}/fine-commons-lang3/src",
+				"${srcDir}/fine-commons-collections4/src"
 				]
 		}
 	}
@@ -40,7 +43,7 @@ sourceSets{
 sourceSets.main.output.classesDir =  file('build/classes/1')
 repositories{
 	mavenCentral()
-} 
+}
 
 //获取什么分支名
 FileTree files =fileTree(dir:'./',include:'build.*.gradle')
@@ -75,6 +78,9 @@ task copyFiles(type:Copy,dependsOn:'compileJava'){
 		with dataContent.call("${srcDir}/fine-poi/src")
 		with dataContent.call("${srcDir}/fine-quartz/src")
 		with dataContent.call("${srcDir}/fine-commons-io/src")
+        with dataContent.call("${srcDir}/fine-commons-fileupload/src")
+		with dataContent.call("${srcDir}/fine-commons-lang3/src")
+		with dataContent.call("${srcDir}/fine-commons-collections4/src")
 		into "${classesDir}"
 	}
 }

build.third_step6.gradle

@@ -38,7 +38,8 @@ sourceSets{
 				"${srcDir}/fine-jodd/src",
 				"${srcDir}/fine-redisson/src",
 				"${srcDir}/fine-socketio/src",
-				"${srcDir}/fine-itext/src"
+				"${srcDir}/fine-itext/src",
+				"${srcDir}/fine-kryo/src"
 				]
 		}
 	}
@@ -96,6 +97,7 @@ task copyFiles(type:Copy,dependsOn:'compileJava'){
 		with dataContent.call("${srcDir}/fine-jedis/src")
 		with dataContent.call("${srcDir}/fine-jedis/resources")
 		with dataContent.call("${srcDir}/fine-cssparser/src")
+		with dataContent.call("${srcDir}/fine-kryo/src")
 		into "${classesDir}"
 	}
 }

fine-commons-collections4/src/com/fr/third/org/apache/commons/collections4/ArrayStack.java

@@ -0,0 +1,167 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.fr.third.org.apache.commons.collections4;
+
+import java.util.ArrayList;
+import java.util.EmptyStackException;
+
+/**
+ * An implementation of the {@link java.util.Stack} API that is based on an
+ * <code>ArrayList</code> instead of a <code>Vector</code>, so it is not
+ * synchronized to protect against multi-threaded access.  The implementation
+ * is therefore operates faster in environments where you do not need to
+ * worry about multiple thread contention.
+ * <p>
+ * The removal order of an <code>ArrayStack</code> is based on insertion
+ * order: The most recently added element is removed first.  The iteration
+ * order is <i>not</i> the same as the removal order.  The iterator returns
+ * elements from the bottom up.
+ * <p>
+ * Unlike <code>Stack</code>, <code>ArrayStack</code> accepts null entries.
+ * <p>
+ * <b>Note:</b> From version 4.0 onwards, this class does not implement the
+ * removed {@code Buffer} interface anymore.
+ *
+ * @see java.util.Stack
+ * @since 1.0
+ * @version $Id: ArrayStack.java 1477779 2013-04-30 18:55:24Z tn $
+ * @deprecated use {@link java.util.ArrayDeque} instead (available from Java 1.6)
+ */
+@Deprecated
+public class ArrayStack<E> extends ArrayList<E> {
+
+    /** Ensure serialization compatibility */
+    private static final long serialVersionUID = 2130079159931574599L;
+
+    /**
+     * Constructs a new empty <code>ArrayStack</code>. The initial size
+     * is controlled by <code>ArrayList</code> and is currently 10.
+     */
+    public ArrayStack() {
+        super();
+    }
+
+    /**
+     * Constructs a new empty <code>ArrayStack</code> with an initial size.
+     *
+     * @param initialSize  the initial size to use
+     * @throws IllegalArgumentException  if the specified initial size
+     *  is negative
+     */
+    public ArrayStack(final int initialSize) {
+        super(initialSize);
+    }
+
+    /**
+     * Return <code>true</code> if this stack is currently empty.
+     * <p>
+     * This method exists for compatibility with <code>java.util.Stack</code>.
+     * New users of this class should use <code>isEmpty</code> instead.
+     *
+     * @return true if the stack is currently empty
+     */
+    public boolean empty() {
+        return isEmpty();
+    }
+
+    /**
+     * Returns the top item off of this stack without removing it.
+     *
+     * @return the top item on the stack
+     * @throws EmptyStackException  if the stack is empty
+     */
+    public E peek() throws EmptyStackException {
+        final int n = size();
+        if (n <= 0) {
+            throw new EmptyStackException();
+        } else {
+            return get(n - 1);
+        }
+    }
+
+    /**
+     * Returns the n'th item down (zero-relative) from the top of this
+     * stack without removing it.
+     *
+     * @param n  the number of items down to go
+     * @return the n'th item on the stack, zero relative
+     * @throws EmptyStackException  if there are not enough items on the
+     *  stack to satisfy this request
+     */
+    public E peek(final int n) throws EmptyStackException {
+        final int m = (size() - n) - 1;
+        if (m < 0) {
+            throw new EmptyStackException();
+        } else {
+            return get(m);
+        }
+    }
+
+    /**
+     * Pops the top item off of this stack and return it.
+     *
+     * @return the top item on the stack
+     * @throws EmptyStackException  if the stack is empty
+     */
+    public E pop() throws EmptyStackException {
+        final int n = size();
+        if (n <= 0) {
+            throw new EmptyStackException();
+        } else {
+            return remove(n - 1);
+        }
+    }
+
+    /**
+     * Pushes a new item onto the top of this stack. The pushed item is also
+     * returned. This is equivalent to calling <code>add</code>.
+     *
+     * @param item  the item to be added
+     * @return the item just pushed
+     */
+    public E push(final E item) {
+        add(item);
+        return item;
+    }
+
+    /**
+     * Returns the one-based position of the distance from the top that the
+     * specified object exists on this stack, where the top-most element is
+     * considered to be at distance <code>1</code>.  If the object is not
+     * present on the stack, return <code>-1</code> instead.  The
+     * <code>equals()</code> method is used to compare to the items
+     * in this stack.
+     *
+     * @param object  the object to be searched for
+     * @return the 1-based depth into the stack of the object, or -1 if not found
+     */
+    public int search(final Object object) {
+        int i = size() - 1;        // Current index
+        int n = 1;                 // Current distance
+        while (i >= 0) {
+            final Object current = get(i);
+            if ((object == null && current == null) ||
+                (object != null && object.equals(current))) {
+                return n;
+            }
+            i--;
+            n++;
+        }
+        return -1;
+    }
+
+}

fine-commons-collections4/src/com/fr/third/org/apache/commons/collections4/Bag.java

@@ -0,0 +1,221 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.fr.third.org.apache.commons.collections4;
+
+import java.util.Collection;
+import java.util.Iterator;
+import java.util.Set;
+
+/**
+ * Defines a collection that counts the number of times an object appears in
+ * the collection.
+ * <p>
+ * Suppose you have a Bag that contains <code>{a, a, b, c}</code>.
+ * Calling {@link #getCount(Object)} on <code>a</code> would return 2, while
+ * calling {@link #uniqueSet()} would return <code>{a, b, c}</code>.
+ * <p>
+ * <i>NOTE: This interface violates the {@link Collection} contract.</i>
+ * The behavior specified in many of these methods is <i>not</i> the same
+ * as the behavior specified by <code>Collection</code>.
+ * The noncompliant methods are clearly marked with "(Violation)".
+ * Exercise caution when using a bag as a <code>Collection</code>.
+ * <p>
+ * This violation resulted from the original specification of this interface.
+ * In an ideal world, the interface would be changed to fix the problems, however
+ * it has been decided to maintain backwards compatibility instead.
+ *
+ * @param <E> the type held in the bag
+ * @since 2.0
+ * @version $Id: Bag.java 1477779 2013-04-30 18:55:24Z tn $
+ */
+public interface Bag<E> extends Collection<E> {
+
+    /**
+     * Returns the number of occurrences (cardinality) of the given
+     * object currently in the bag. If the object does not exist in the
+     * bag, return 0.
+     *
+     * @param object  the object to search for
+     * @return the number of occurrences of the object, zero if not found
+     */
+    int getCount(Object object);
+
+    /**
+     * <i>(Violation)</i>
+     * Adds one copy of the specified object to the Bag.
+     * <p>
+     * If the object is already in the {@link #uniqueSet()} then increment its
+     * count as reported by {@link #getCount(Object)}. Otherwise add it to the
+     * {@link #uniqueSet()} and report its count as 1.
+     * <p>
+     * Since this method always increases the size of the bag,
+     * according to the {@link Collection#add(Object)} contract, it
+     * should always return <code>true</code>.  Since it sometimes returns
+     * <code>false</code>, this method violates the contract.
+     *
+     * @param object  the object to add
+     * @return <code>true</code> if the object was not already in the <code>uniqueSet</code>
+     */
+    boolean add(E object);
+
+    /**
+     * Adds <code>nCopies</code> copies of the specified object to the Bag.
+     * <p>
+     * If the object is already in the {@link #uniqueSet()} then increment its
+     * count as reported by {@link #getCount(Object)}. Otherwise add it to the
+     * {@link #uniqueSet()} and report its count as <code>nCopies</code>.
+     *
+     * @param object  the object to add
+     * @param nCopies  the number of copies to add
+     * @return <code>true</code> if the object was not already in the <code>uniqueSet</code>
+     */
+    boolean add(E object, int nCopies);
+
+    /**
+     * <i>(Violation)</i>
+     * Removes all occurrences of the given object from the bag.
+     * <p>
+     * This will also remove the object from the {@link #uniqueSet()}.
+     * <p>
+     * According to the {@link Collection#remove(Object)} method,
+     * this method should only remove the <i>first</i> occurrence of the
+     * given object, not <i>all</i> occurrences.
+     *
+     * @param object  the object to remove
+     * @return <code>true</code> if this call changed the collection
+     */
+    boolean remove(Object object);
+
+    /**
+     * Removes <code>nCopies</code> copies of the specified object from the Bag.
+     * <p>
+     * If the number of copies to remove is greater than the actual number of
+     * copies in the Bag, no error is thrown.
+     *
+     * @param object  the object to remove
+     * @param nCopies  the number of copies to remove
+     * @return <code>true</code> if this call changed the collection
+     */
+    boolean remove(Object object, int nCopies);
+
+    /**
+     * Returns a {@link Set} of unique elements in the Bag.
+     * <p>
+     * Uniqueness constraints are the same as those in {@link java.util.Set}.
+     *
+     * @return the Set of unique Bag elements
+     */
+    Set<E> uniqueSet();
+
+    /**
+     * Returns the total number of items in the bag across all types.
+     *
+     * @return the total size of the Bag
+     */
+    int size();
+
+    /**
+     * <i>(Violation)</i>
+     * Returns <code>true</code> if the bag contains all elements in
+     * the given collection, respecting cardinality.  That is, if the
+     * given collection <code>coll</code> contains <code>n</code> copies
+     * of a given object, calling {@link #getCount(Object)} on that object must
+     * be <code>&gt;= n</code> for all <code>n</code> in <code>coll</code>.
+     * <p>
+     * The {@link Collection#containsAll(Collection)} method specifies
+     * that cardinality should <i>not</i> be respected; this method should
+     * return true if the bag contains at least one of every object contained
+     * in the given collection.
+     *
+     * @param coll  the collection to check against
+     * @return <code>true</code> if the Bag contains all the collection
+     */
+    boolean containsAll(Collection<?> coll);
+
+    /**
+     * <i>(Violation)</i>
+     * Remove all elements represented in the given collection,
+     * respecting cardinality.  That is, if the given collection
+     * <code>coll</code> contains <code>n</code> copies of a given object,
+     * the bag will have <code>n</code> fewer copies, assuming the bag
+     * had at least <code>n</code> copies to begin with.
+     *
+     * <p>The {@link Collection#removeAll(Collection)} method specifies
+     * that cardinality should <i>not</i> be respected; this method should
+     * remove <i>all</i> occurrences of every object contained in the
+     * given collection.
+     *
+     * @param coll  the collection to remove
+     * @return <code>true</code> if this call changed the collection
+     */
+    boolean removeAll(Collection<?> coll);
+
+    /**
+     * <i>(Violation)</i>
+     * Remove any members of the bag that are not in the given
+     * collection, respecting cardinality.  That is, if the given
+     * collection <code>coll</code> contains <code>n</code> copies of a
+     * given object and the bag has <code>m &gt; n</code> copies, then
+     * delete <code>m - n</code> copies from the bag.  In addition, if
+     * <code>e</code> is an object in the bag but
+     * <code>!coll.contains(e)</code>, then remove <code>e</code> and any
+     * of its copies.
+     *
+     * <p>The {@link Collection#retainAll(Collection)} method specifies
+     * that cardinality should <i>not</i> be respected; this method should
+     * keep <i>all</i> occurrences of every object contained in the
+     * given collection.
+     *
+     * @param coll  the collection to retain
+     * @return <code>true</code> if this call changed the collection
+     */
+    boolean retainAll(Collection<?> coll);
+
+    /**
+     * Returns an {@link Iterator} over the entire set of members,
+     * including copies due to cardinality. This iterator is fail-fast
+     * and will not tolerate concurrent modifications.
+     *
+     * @return iterator over all elements in the Bag
+     */
+    Iterator<E> iterator();
+
+    // The following is not part of the formal Bag interface, however where possible
+    // Bag implementations should follow these comments.
+//    /**
+//     * Compares this Bag to another.
+//     * This Bag equals another Bag if it contains the same number of occurrences of
+//     * the same elements.
+//     * This equals definition is compatible with the Set interface.
+//     *
+//     * @param obj  the Bag to compare to
+//     * @return true if equal
+//     */
+//    boolean equals(Object obj);
+//
+//    /**
+//     * Gets a hash code for the Bag compatible with the definition of equals.
+//     * The hash code is defined as the sum total of a hash code for each element.
+//     * The per element hash code is defined as
+//     * <code>(e==null ? 0 : e.hashCode()) ^ noOccurances)</code>.
+//     * This hash code definition is compatible with the Set interface.
+//     *
+//     * @return the hash code of the Bag
+//     */
+//    int hashCode();
+
+}

fine-commons-collections4/src/com/fr/third/org/apache/commons/collections4/BagUtils.java

@@ -0,0 +1,273 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.fr.third.org.apache.commons.collections4;
+
+import com.fr.third.org.apache.commons.collections4.bag.CollectionBag;
+import com.fr.third.org.apache.commons.collections4.bag.HashBag;
+import com.fr.third.org.apache.commons.collections4.bag.PredicatedBag;
+import com.fr.third.org.apache.commons.collections4.bag.PredicatedSortedBag;
+import com.fr.third.org.apache.commons.collections4.bag.SynchronizedBag;
+import com.fr.third.org.apache.commons.collections4.bag.SynchronizedSortedBag;
+import com.fr.third.org.apache.commons.collections4.bag.TransformedBag;
+import com.fr.third.org.apache.commons.collections4.bag.TransformedSortedBag;
+import com.fr.third.org.apache.commons.collections4.bag.TreeBag;
+import com.fr.third.org.apache.commons.collections4.bag.UnmodifiableBag;
+import com.fr.third.org.apache.commons.collections4.bag.UnmodifiableSortedBag;
+import com.fr.third.org.apache.commons.collections4.bag.CollectionBag;
+import com.fr.third.org.apache.commons.collections4.bag.HashBag;
+import com.fr.third.org.apache.commons.collections4.bag.PredicatedBag;
+import com.fr.third.org.apache.commons.collections4.bag.PredicatedSortedBag;
+import com.fr.third.org.apache.commons.collections4.bag.SynchronizedBag;
+import com.fr.third.org.apache.commons.collections4.bag.SynchronizedSortedBag;
+import com.fr.third.org.apache.commons.collections4.bag.TransformedBag;
+import com.fr.third.org.apache.commons.collections4.bag.TransformedSortedBag;
+import com.fr.third.org.apache.commons.collections4.bag.TreeBag;
+import com.fr.third.org.apache.commons.collections4.bag.UnmodifiableBag;
+import com.fr.third.org.apache.commons.collections4.bag.UnmodifiableSortedBag;
+
+/**
+ * Provides utility methods and decorators for {@link Bag} and {@link SortedBag} instances.
+ *
+ * @since 2.1
+ * @version $Id: BagUtils.java 1686855 2015-06-22 13:00:27Z tn $
+ */
+public class BagUtils {
+
+    /**
+     * An empty unmodifiable bag.
+     */
+    @SuppressWarnings("rawtypes") // OK, empty bag is compatible with any type
+    public static final Bag EMPTY_BAG = UnmodifiableBag.unmodifiableBag(new HashBag<Object>());
+
+    /**
+     * An empty unmodifiable sorted bag.
+     */
+    @SuppressWarnings("rawtypes") // OK, empty bag is compatible with any type
+    public static final Bag EMPTY_SORTED_BAG =
+            UnmodifiableSortedBag.unmodifiableSortedBag(new TreeBag<Object>());
+
+    /**
+     * Instantiation of BagUtils is not intended or required.
+     */
+    private BagUtils() {}
+
+    //-----------------------------------------------------------------------
+    /**
+     * Returns a synchronized (thread-safe) bag backed by the given bag. In
+     * order to guarantee serial access, it is critical that all access to the
+     * backing bag is accomplished through the returned bag.
+     * <p>
+     * It is imperative that the user manually synchronize on the returned bag
+     * when iterating over it:
+     *
+     * <pre>
+     * Bag bag = BagUtils.synchronizedBag(new HashBag());
+     * ...
+     * synchronized(bag) {
+     *     Iterator i = bag.iterator(); // Must be in synchronized block
+     *     while (i.hasNext())
+     *         foo(i.next());
+     *     }
+     * }
+     * </pre>
+     *
+     * Failure to follow this advice may result in non-deterministic behavior.
+     *
+     * @param <E> the element type
+     * @param bag the bag to synchronize, must not be null
+     * @return a synchronized bag backed by that bag
+     * @throws NullPointerException if the Bag is null
+     */
+    public static <E> Bag<E> synchronizedBag(final Bag<E> bag) {
+        return SynchronizedBag.synchronizedBag(bag);
+    }
+
+    /**
+     * Returns an unmodifiable view of the given bag. Any modification attempts
+     * to the returned bag will raise an {@link UnsupportedOperationException}.
+     *
+     * @param <E> the element type
+     * @param bag the bag whose unmodifiable view is to be returned, must not be null
+     * @return an unmodifiable view of that bag
+     * @throws NullPointerException if the Bag is null
+     */
+    public static <E> Bag<E> unmodifiableBag(final Bag<? extends E> bag) {
+        return UnmodifiableBag.unmodifiableBag(bag);
+    }
+
+    /**
+     * Returns a predicated (validating) bag backed by the given bag.
+     * <p>
+     * Only objects that pass the test in the given predicate can be added to
+     * the bag. Trying to add an invalid object results in an
+     * IllegalArgumentException. It is important not to use the original bag
+     * after invoking this method, as it is a backdoor for adding invalid
+     * objects.
+     *
+     * @param <E> the element type
+     * @param bag the bag to predicate, must not be null
+     * @param predicate the predicate for the bag, must not be null
+     * @return a predicated bag backed by the given bag
+     * @throws NullPointerException if the Bag or Predicate is null
+     */
+    public static <E> Bag<E> predicatedBag(final Bag<E> bag, final Predicate<? super E> predicate) {
+        return PredicatedBag.predicatedBag(bag, predicate);
+    }
+
+    /**
+     * Returns a transformed bag backed by the given bag.
+     * <p>
+     * Each object is passed through the transformer as it is added to the Bag.
+     * It is important not to use the original bag after invoking this method,
+     * as it is a backdoor for adding untransformed objects.
+     * <p>
+     * Existing entries in the specified bag will not be transformed.
+     * If you want that behaviour, see {@link TransformedBag#transformedBag(Bag, Transformer)}.
+     *
+     * @param <E> the element type
+     * @param bag the bag to predicate, must not be null
+     * @param transformer the transformer for the bag, must not be null
+     * @return a transformed bag backed by the given bag
+     * @throws NullPointerException if the Bag or Transformer is null
+     */
+    public static <E> Bag<E> transformingBag(final Bag<E> bag, final Transformer<? super E, ? extends E> transformer) {
+        return TransformedBag.transformingBag(bag, transformer);
+    }
+
+    /**
+     * Returns a bag that complies to the Collection contract, backed by the given bag.
+     *
+     * @param <E> the element type
+     * @param bag the bag to decorate, must not be null
+     * @return a Bag that complies to the Collection contract
+     * @throws NullPointerException if bag is null
+     * @since 4.0
+     */
+    public static <E> Bag<E> collectionBag(final Bag<E> bag) {
+        return CollectionBag.collectionBag(bag);
+    }
+
+    //-----------------------------------------------------------------------
+    /**
+     * Returns a synchronized (thread-safe) sorted bag backed by the given
+     * sorted bag. In order to guarantee serial access, it is critical that all
+     * access to the backing bag is accomplished through the returned bag.
+     * <p>
+     * It is imperative that the user manually synchronize on the returned bag
+     * when iterating over it:
+     *
+     * <pre>
+     * SortedBag bag = BagUtils.synchronizedSortedBag(new TreeBag());
+     * ...
+     * synchronized(bag) {
+     *     Iterator i = bag.iterator(); // Must be in synchronized block
+     *     while (i.hasNext())
+     *         foo(i.next());
+     *     }
+     * }
+     * </pre>
+     *
+     * Failure to follow this advice may result in non-deterministic behavior.
+     *
+     * @param <E> the element type
+     * @param bag the bag to synchronize, must not be null
+     * @return a synchronized bag backed by that bag
+     * @throws NullPointerException if the SortedBag is null
+     */
+    public static <E> SortedBag<E> synchronizedSortedBag(final SortedBag<E> bag) {
+        return SynchronizedSortedBag.synchronizedSortedBag(bag);
+    }
+
+    /**
+     * Returns an unmodifiable view of the given sorted bag. Any modification
+     * attempts to the returned bag will raise an
+     * {@link UnsupportedOperationException}.
+     *
+     * @param <E> the element type
+     * @param bag the bag whose unmodifiable view is to be returned, must not be null
+     * @return an unmodifiable view of that bag
+     * @throws NullPointerException if the SortedBag is null
+     */
+    public static <E> SortedBag<E> unmodifiableSortedBag(final SortedBag<E> bag) {
+        return UnmodifiableSortedBag.unmodifiableSortedBag(bag);
+    }
+
+    /**
+     * Returns a predicated (validating) sorted bag backed by the given sorted
+     * bag.
+     * <p>
+     * Only objects that pass the test in the given predicate can be added to
+     * the bag. Trying to add an invalid object results in an
+     * IllegalArgumentException. It is important not to use the original bag
+     * after invoking this method, as it is a backdoor for adding invalid
+     * objects.
+     *
+     * @param <E> the element type
+     * @param bag the sorted bag to predicate, must not be null
+     * @param predicate the predicate for the bag, must not be null
+     * @return a predicated bag backed by the given bag
+     * @throws NullPointerException if the SortedBag or Predicate is null
+     */
+    public static <E> SortedBag<E> predicatedSortedBag(final SortedBag<E> bag,
+            final Predicate<? super E> predicate) {
+        return PredicatedSortedBag.predicatedSortedBag(bag, predicate);
+    }
+
+    /**
+     * Returns a transformed sorted bag backed by the given bag.
+     * <p>
+     * Each object is passed through the transformer as it is added to the Bag.
+     * It is important not to use the original bag after invoking this method,
+     * as it is a backdoor for adding untransformed objects.
+     * <p>
+     * Existing entries in the specified bag will not be transformed.
+     * If you want that behaviour, see
+     * {@link TransformedSortedBag#transformedSortedBag(SortedBag, Transformer)}.
+     *
+     * @param <E> the element type
+     * @param bag the bag to predicate, must not be null
+     * @param transformer the transformer for the bag, must not be null
+     * @return a transformed bag backed by the given bag
+     * @throws NullPointerException if the Bag or Transformer is null
+     */
+    public static <E> SortedBag<E> transformingSortedBag(final SortedBag<E> bag,
+                                                         final Transformer<? super E, ? extends E> transformer) {
+        return TransformedSortedBag.transformingSortedBag(bag, transformer);
+    }
+
+    /**
+     * Get an empty <code>Bag</code>.
+     *
+     * @param <E> the element type
+     * @return an empty Bag
+     */
+    @SuppressWarnings("unchecked") // OK, empty bag is compatible with any type
+    public static <E> Bag<E> emptyBag() {
+        return (Bag<E>) EMPTY_BAG;
+    }
+
+    /**
+     * Get an empty <code>SortedBag</code>.
+     *
+     * @param <E> the element type
+     * @return an empty sorted Bag
+     */
+    @SuppressWarnings("unchecked") // OK, empty bag is compatible with any type
+    public static <E> SortedBag<E> emptySortedBag() {
+        return (SortedBag<E>) EMPTY_SORTED_BAG;
+    }
+}

fine-commons-collections4/src/com/fr/third/org/apache/commons/collections4/BidiMap.java

@@ -0,0 +1,144 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.fr.third.org.apache.commons.collections4;
+
+import java.util.Set;
+
+/**
+ * Defines a map that allows bidirectional lookup between key and values.
+ * <p>
+ * This extended <code>Map</code> represents a mapping where a key may
+ * lookup a value and a value may lookup a key with equal ease.
+ * This interface extends <code>Map</code> and so may be used anywhere a map
+ * is required. The interface provides an inverse map view, enabling
+ * full access to both directions of the <code>BidiMap</code>.
+ * <p>
+ * Implementations should allow a value to be looked up from a key and
+ * a key to be looked up from a value with equal performance.
+ * <p>
+ * This map enforces the restriction that there is a 1:1 relation between
+ * keys and values, meaning that multiple keys cannot map to the same value.
+ * This is required so that "inverting" the map results in a map without
+ * duplicate keys. See the {@link #put} method description for more information.
+ *
+ * @param <K> the type of the keys in the map
+ * @param <V> the type of the values in the map
+ *
+ * @since 3.0
+ * @version $Id: BidiMap.java 1612021 2014-07-20 04:51:05Z ggregory $
+ */
+public interface BidiMap<K, V> extends IterableMap<K, V> {
+
+    /**
+     * Puts the key-value pair into the map, replacing any previous pair.
+     * <p>
+     * When adding a key-value pair, the value may already exist in the map
+     * against a different key. That mapping is removed, to ensure that the
+     * value only occurs once in the inverse map.
+     * <pre>
+     *  BidiMap map1 = new DualHashBidiMap();
+     *  map.put("A","B");  // contains A mapped to B, as per Map
+     *  map.put("A","C");  // contains A mapped to C, as per Map
+     *
+     *  BidiMap map2 = new DualHashBidiMap();
+     *  map.put("A","B");  // contains A mapped to B, as per Map
+     *  map.put("C","B");  // contains C mapped to B, key A is removed
+     * </pre>
+     *
+     * @param key  the key to store
+     * @param value  the value to store
+     * @return the previous value mapped to this key
+     *
+     * @throws UnsupportedOperationException if the <code>put</code> method is not supported
+     * @throws ClassCastException (optional) if the map limits the type of the
+     *  value and the specified value is inappropriate
+     * @throws IllegalArgumentException (optional) if the map limits the values
+     *  in some way and the value was invalid
+     * @throws NullPointerException (optional) if the map limits the values to
+     *  non-null and null was specified
+     */
+    V put(K key, V value);
+
+    /**
+     * Gets the key that is currently mapped to the specified value.
+     * <p>
+     * If the value is not contained in the map, <code>null</code> is returned.
+     * <p>
+     * Implementations should seek to make this method perform equally as well
+     * as <code>get(Object)</code>.
+     *
+     * @param value  the value to find the key for
+     * @return the mapped key, or <code>null</code> if not found
+     *
+     * @throws ClassCastException (optional) if the map limits the type of the
+     *  value and the specified value is inappropriate
+     * @throws NullPointerException (optional) if the map limits the values to
+     *  non-null and null was specified
+     */
+    K getKey(Object value);
+
+    /**
+     * Removes the key-value pair that is currently mapped to the specified
+     * value (optional operation).
+     * <p>
+     * If the value is not contained in the map, <code>null</code> is returned.
+     * <p>
+     * Implementations should seek to make this method perform equally as well
+     * as <code>remove(Object)</code>.
+     *
+     * @param value  the value to find the key-value pair for
+     * @return the key that was removed, <code>null</code> if nothing removed
+     *
+     * @throws ClassCastException (optional) if the map limits the type of the
+     *  value and the specified value is inappropriate
+     * @throws NullPointerException (optional) if the map limits the values to
+     *  non-null and null was specified
+     * @throws UnsupportedOperationException if this method is not supported
+     *  by the implementation
+     */
+    K removeValue(Object value);
+
+    /**
+     * Gets a view of this map where the keys and values are reversed.
+     * <p>
+     * Changes to one map will be visible in the other and vice versa.
+     * This enables both directions of the map to be accessed as a <code>Map</code>.
+     * <p>
+     * Implementations should seek to avoid creating a new object every time this
+     * method is called. See <code>AbstractMap.values()</code> etc. Calling this
+     * method on the inverse map should return the original.
+     *
+     * @return an inverted bidirectional map
+     */
+    BidiMap<V, K> inverseBidiMap();
+
+    /**
+     * Returns a {@link Set} view of the values contained in this map.
+     * The set is backed by the map, so changes to the map are reflected
+     * in the set, and vice-versa.  If the map is modified while an iteration
+     * over the set is in progress (except through the iterator's own
+     * {@code remove} operation), the results of the iteration are undefined.
+     * The set supports element removal, which removes the corresponding
+     * mapping from the map, via the {@code Iterator.remove},
+     * {@code Collection.remove}, {@code removeAll},
+     * {@code retainAll} and {@code clear} operations.  It does not
+     * support the {@code add} or {@code addAll} operations.
+     *
+     * @return a set view of the values contained in this map
+     */
+    Set<V> values();
+}

fine-commons-collections4/src/com/fr/third/org/apache/commons/collections4/BoundedCollection.java

@@ -0,0 +1,50 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.fr.third.org.apache.commons.collections4;
+
+import java.util.Collection;
+
+/**
+ * Defines a collection that is bounded in size.
+ * <p>
+ * The size of the collection can vary, but it can never exceed a preset
+ * maximum number of elements. This interface allows the querying of details
+ * associated with the maximum number of elements.
+ *
+ * @see CollectionUtils#isFull
+ * @see CollectionUtils#maxSize
+ *
+ * @since 3.0
+ * @version $Id: BoundedCollection.java 1477779 2013-04-30 18:55:24Z tn $
+ */
+public interface BoundedCollection<E> extends Collection<E> {
+
+    /**
+     * Returns true if this collection is full and no new elements can be added.
+     *
+     * @return <code>true</code> if the collection is full
+     */
+    boolean isFull();
+
+    /**
+     * Gets the maximum size of the collection (the bound).
+     *
+     * @return the maximum number of elements the collection can hold
+     */
+    int maxSize();
+
+}

fine-commons-collections4/src/com/fr/third/org/apache/commons/collections4/BoundedMap.java

@@ -0,0 +1,45 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.fr.third.org.apache.commons.collections4;
+
+/**
+ * Defines a map that is bounded in size.
+ * <p>
+ * The size of the map can vary, but it can never exceed a preset
+ * maximum number of elements. This interface allows the querying of details
+ * associated with the maximum number of elements.
+ *
+ * @since 3.0
+ * @version $Id: BoundedMap.java 1477779 2013-04-30 18:55:24Z tn $
+ */
+public interface BoundedMap<K, V> extends IterableMap<K, V> {
+
+    /**
+     * Returns true if this map is full and no new elements can be added.
+     *
+     * @return <code>true</code> if the map is full
+     */
+    boolean isFull();
+
+    /**
+     * Gets the maximum size of the map (the bound).
+     *
+     * @return the maximum number of elements the map can hold
+     */
+    int maxSize();
+
+}

fine-commons-collections4/src/com/fr/third/org/apache/commons/collections4/Closure.java

@@ -0,0 +1,44 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.fr.third.org.apache.commons.collections4;
+
+/**
+ * Defines a functor interface implemented by classes that do something.
+ * <p>
+ * A <code>Closure</code> represents a block of code which is executed from
+ * inside some block, function or iteration. It operates an input object.
+ * <p>
+ * Standard implementations of common closures are provided by
+ * {@link ClosureUtils}. These include method invocation and for/while loops.
+ *
+ * @param <T> the type that the closure acts on
+ * @since 1.0
+ * @version $Id: Closure.java 1543261 2013-11-19 00:47:34Z ggregory $
+ */
+public interface Closure<T> {
+
+    /**
+     * Performs an action on the specified input object.
+     *
+     * @param input  the input to execute on
+     * @throws ClassCastException (runtime) if the input is the wrong class
+     * @throws IllegalArgumentException (runtime) if the input is invalid
+     * @throws FunctorException (runtime) if any other error occurs
+     */
+    void execute(T input);
+
+}

fine-commons-collections4/src/com/fr/third/org/apache/commons/collections4/ClosureUtils.java

@@ -0,0 +1,386 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.fr.third.org.apache.commons.collections4;
+
+import java.util.Collection;
+import java.util.Map;
+
+import com.fr.third.org.apache.commons.collections4.functors.ChainedClosure;
+import com.fr.third.org.apache.commons.collections4.functors.EqualPredicate;
+import com.fr.third.org.apache.commons.collections4.functors.ExceptionClosure;
+import com.fr.third.org.apache.commons.collections4.functors.ForClosure;
+import com.fr.third.org.apache.commons.collections4.functors.IfClosure;
+import com.fr.third.org.apache.commons.collections4.functors.InvokerTransformer;
+import com.fr.third.org.apache.commons.collections4.functors.NOPClosure;
+import com.fr.third.org.apache.commons.collections4.functors.SwitchClosure;
+import com.fr.third.org.apache.commons.collections4.functors.TransformerClosure;
+import com.fr.third.org.apache.commons.collections4.functors.WhileClosure;
+import com.fr.third.org.apache.commons.collections4.functors.ChainedClosure;
+import com.fr.third.org.apache.commons.collections4.functors.EqualPredicate;
+import com.fr.third.org.apache.commons.collections4.functors.ExceptionClosure;
+import com.fr.third.org.apache.commons.collections4.functors.ForClosure;
+import com.fr.third.org.apache.commons.collections4.functors.IfClosure;
+import com.fr.third.org.apache.commons.collections4.functors.InvokerTransformer;
+import com.fr.third.org.apache.commons.collections4.functors.NOPClosure;
+import com.fr.third.org.apache.commons.collections4.functors.SwitchClosure;
+import com.fr.third.org.apache.commons.collections4.functors.TransformerClosure;
+import com.fr.third.org.apache.commons.collections4.functors.WhileClosure;
+
+/**
+ * <code>ClosureUtils</code> provides reference implementations and utilities
+ * for the Closure functor interface. The supplied closures are:
+ * <ul>
+ * <li>Invoker - invokes a method on the input object
+ * <li>For - repeatedly calls a closure for a fixed number of times
+ * <li>While - repeatedly calls a closure while a predicate is true
+ * <li>Chained - chains two or more closures together
+ * <li>If - calls one closure or another based on a predicate
+ * <li>Switch - calls one closure based on one or more predicates
+ * <li>SwitchMap - calls one closure looked up from a Map
+ * <li>Transformer - wraps a Transformer as a Closure
+ * <li>NOP - does nothing
+ * <li>Exception - always throws an exception
+ * </ul>
+ * <p>
+ * Since v4.1 only closures which are considered to be unsafe are
+ * Serializable. Closures considered to be unsafe for serialization are:
+ * <ul>
+ * <li>Invoker
+ * <li>For
+ * <li>While
+ * </ul>
+ *
+ * @since 3.0
+ * @version $Id: ClosureUtils.java 1714362 2015-11-14 20:38:02Z tn $
+ */
+public class ClosureUtils {
+
+    /**
+     * This class is not normally instantiated.
+     */
+    private ClosureUtils() {}
+
+    /**
+     * Gets a Closure that always throws an exception.
+     * This could be useful during testing as a placeholder.
+     *
+     * @see ExceptionClosure
+     *
+     * @param <E>  the type that the closure acts on
+     * @return the closure
+     */
+    public static <E> Closure<E> exceptionClosure() {
+        return ExceptionClosure.<E>exceptionClosure();
+    }
+
+    /**
+     * Gets a Closure that will do nothing.
+     * This could be useful during testing as a placeholder.
+     *
+     * @see NOPClosure
+     *
+     * @param <E>  the type that the closure acts on
+     * @return the closure
+     */
+    public static <E> Closure<E> nopClosure() {
+        return NOPClosure.<E>nopClosure();
+    }
+
+    /**
+     * Creates a Closure that calls a Transformer each time it is called.
+     * The transformer will be called using the closure's input object.
+     * The transformer's result will be ignored.
+     *
+     * @see TransformerClosure
+     *
+     * @param <E>  the type that the closure acts on
+     * @param transformer  the transformer to run each time in the closure, null means nop
+     * @return the closure
+     */
+    public static <E> Closure<E> asClosure(final Transformer<? super E, ?> transformer) {
+        return TransformerClosure.transformerClosure(transformer);
+    }
+
+    /**
+     * Creates a Closure that will call the closure <code>count</code> times.
+     * <p>
+     * A null closure or zero count returns the <code>NOPClosure</code>.
+     *
+     * @see ForClosure
+     *
+     * @param <E>  the type that the closure acts on
+     * @param count  the number of times to loop
+     * @param closure  the closure to call repeatedly
+     * @return the <code>for</code> closure
+     */
+    public static <E> Closure<E> forClosure(final int count, final Closure<? super E> closure) {
+        return ForClosure.forClosure(count, closure);
+    }
+
+    /**
+     * Creates a Closure that will call the closure repeatedly until the
+     * predicate returns false.
+     *
+     * @see WhileClosure
+     *
+     * @param <E>  the type that the closure acts on
+     * @param predicate  the predicate to use as an end of loop test, not null
+     * @param closure  the closure to call repeatedly, not null
+     * @return the <code>while</code> closure
+     * @throws NullPointerException if either argument is null
+     */
+    public static <E> Closure<E> whileClosure(final Predicate<? super E> predicate, final Closure<? super E> closure) {
+        return WhileClosure.<E>whileClosure(predicate, closure, false);
+    }
+
+    /**
+     * Creates a Closure that will call the closure once and then repeatedly
+     * until the predicate returns false.
+     *
+     * @see WhileClosure
+     *
+     * @param <E>  the type that the closure acts on
+     * @param closure  the closure to call repeatedly, not null
+     * @param predicate  the predicate to use as an end of loop test, not null
+     * @return the <code>do-while</code> closure
+     * @throws NullPointerException if either argument is null
+     */
+    public static <E> Closure<E> doWhileClosure(final Closure<? super E> closure,
+                                                final Predicate<? super E> predicate) {
+        return WhileClosure.<E>whileClosure(predicate, closure, true);
+    }
+
+    /**
+     * Creates a Closure that will invoke a specific method on the closure's
+     * input object by reflection.
+     *
+     * @see InvokerTransformer
+     * @see TransformerClosure
+     *
+     * @param <E>  the type that the closure acts on
+     * @param methodName  the name of the method
+     * @return the <code>invoker</code> closure
+     * @throws NullPointerException if the method name is null
+     */
+    public static <E> Closure<E> invokerClosure(final String methodName) {
+        // reuse transformer as it has caching - this is lazy really, should have inner class here
+        return asClosure(InvokerTransformer.<E, Object>invokerTransformer(methodName));
+    }
+
+    /**
+     * Creates a Closure that will invoke a specific method on the closure's
+     * input object by reflection.
+     *
+     * @see InvokerTransformer
+     * @see TransformerClosure
+     *
+     * @param <E>  the type that the closure acts on
+     * @param methodName  the name of the method
+     * @param paramTypes  the parameter types
+     * @param args  the arguments
+     * @return the <code>invoker</code> closure
+     * @throws NullPointerException if the method name is null
+     * @throws IllegalArgumentException if the paramTypes and args don't match
+     */
+    public static <E> Closure<E> invokerClosure(final String methodName, final Class<?>[] paramTypes,
+                                                final Object[] args) {
+        // reuse transformer as it has caching - this is lazy really, should have inner class here
+        return asClosure(InvokerTransformer.<E, Object>invokerTransformer(methodName, paramTypes, args));
+    }
+
+    /**
+     * Create a new Closure that calls each closure in turn, passing the
+     * result into the next closure.
+     *
+     * @see ChainedClosure
+     *
+     * @param <E>  the type that the closure acts on
+     * @param closures  an array of closures to chain
+     * @return the <code>chained</code> closure
+     * @throws NullPointerException if the closures array is null
+     * @throws NullPointerException if any closure in the array is null
+     */
+    public static <E> Closure<E> chainedClosure(final Closure<? super E>... closures) {
+        return ChainedClosure.chainedClosure(closures);
+    }
+
+    /**
+     * Create a new Closure that calls each closure in turn, passing the
+     * result into the next closure. The ordering is that of the iterator()
+     * method on the collection.
+     *
+     * @see ChainedClosure
+     *
+     * @param <E>  the type that the closure acts on
+     * @param closures  a collection of closures to chain
+     * @return the <code>chained</code> closure
+     * @throws NullPointerException if the closures collection is null
+     * @throws NullPointerException if any closure in the collection is null
+     * @throws IllegalArgumentException if the closures collection is empty
+     */
+    public static <E> Closure<E> chainedClosure(final Collection<? extends Closure<? super E>> closures) {
+        return ChainedClosure.chainedClosure(closures);
+    }
+
+    /**
+     * Create a new Closure that calls another closure based on the
+     * result of the specified predicate.
+     *
+     * @see IfClosure
+     *
+     * @param <E>  the type that the closure acts on
+     * @param predicate  the validating predicate
+     * @param trueClosure  the closure called if the predicate is true
+     * @return the <code>if</code> closure
+     * @throws NullPointerException if the predicate or closure is null
+     * @since 3.2
+     */
+    public static <E> Closure<E> ifClosure(final Predicate<? super E> predicate,
+                                           final Closure<? super E> trueClosure) {
+        return IfClosure.<E>ifClosure(predicate, trueClosure);
+    }
+
+    /**
+     * Create a new Closure that calls one of two closures depending
+     * on the specified predicate.
+     *
+     * @see IfClosure
+     *
+     * @param <E>  the type that the closure acts on
+     * @param predicate  the predicate to switch on
+     * @param trueClosure  the closure called if the predicate is true
+     * @param falseClosure  the closure called if the predicate is false
+     * @return the <code>switch</code> closure
+     * @throws NullPointerException if the predicate or either closure is null
+     */
+    public static <E> Closure<E> ifClosure(final Predicate<? super E> predicate,
+                                           final Closure<? super E> trueClosure,
+                                           final Closure<? super E> falseClosure) {
+        return IfClosure.<E>ifClosure(predicate, trueClosure, falseClosure);
+    }
+
+    /**
+     * Create a new Closure that calls one of the closures depending
+     * on the predicates.
+     * <p>
+     * The closure at array location 0 is called if the predicate at array
+     * location 0 returned true. Each predicate is evaluated
+     * until one returns true.
+     *
+     * @see SwitchClosure
+     *
+     * @param <E>  the type that the closure acts on
+     * @param predicates  an array of predicates to check, not null
+     * @param closures  an array of closures to call, not null
+     * @return the <code>switch</code> closure
+     * @throws NullPointerException if the either array is null
+     * @throws NullPointerException if any element in the arrays is null
+     * @throws IllegalArgumentException if the arrays have different sizes
+     */
+    public static <E> Closure<E> switchClosure(final Predicate<? super E>[] predicates,
+                                               final Closure<? super E>[] closures) {
+        return SwitchClosure.<E>switchClosure(predicates, closures, null);
+    }
+
+    /**
+     * Create a new Closure that calls one of the closures depending
+     * on the predicates.
+     * <p>
+     * The closure at array location 0 is called if the predicate at array
+     * location 0 returned true. Each predicate is evaluated
+     * until one returns true. If no predicates evaluate to true, the default
+     * closure is called.
+     *
+     * @see SwitchClosure
+     *
+     * @param <E>  the type that the closure acts on
+     * @param predicates  an array of predicates to check, not null
+     * @param closures  an array of closures to call, not null
+     * @param defaultClosure  the default to call if no predicate matches
+     * @return the <code>switch</code> closure
+     * @throws NullPointerException if the either array is null
+     * @throws NullPointerException if any element in the arrays is null
+     * @throws IllegalArgumentException if the arrays are different sizes
+     */
+    public static <E> Closure<E> switchClosure(final Predicate<? super E>[] predicates,
+                                               final Closure<? super E>[] closures,
+                                               final Closure<? super E> defaultClosure) {
+        return SwitchClosure.<E>switchClosure(predicates, closures, defaultClosure);
+    }
+
+    /**
+     * Create a new Closure that calls one of the closures depending
+     * on the predicates.
+     * <p>
+     * The Map consists of Predicate keys and Closure values. A closure
+     * is called if its matching predicate returns true. Each predicate is evaluated
+     * until one returns true. If no predicates evaluate to true, the default
+     * closure is called. The default closure is set in the map with a
+     * null key. The ordering is that of the iterator() method on the entryset
+     * collection of the map.
+     *
+     * @see SwitchClosure
+     *
+     * @param <E>  the type that the closure acts on
+     * @param predicatesAndClosures  a map of predicates to closures
+     * @return the <code>switch</code> closure
+     * @throws NullPointerException if the map is null
+     * @throws NullPointerException if any closure in the map is null
+     * @throws IllegalArgumentException if the map is empty
+     * @throws ClassCastException  if the map elements are of the wrong type
+     */
+    public static <E> Closure<E> switchClosure(final Map<Predicate<E>, Closure<E>> predicatesAndClosures) {
+        return SwitchClosure.switchClosure(predicatesAndClosures);
+    }
+
+    /**
+     * Create a new Closure that uses the input object as a key to find the
+     * closure to call.
+     * <p>
+     * The Map consists of object keys and Closure values. A closure
+     * is called if the input object equals the key. If there is no match, the
+     * default closure is called. The default closure is set in the map
+     * using a null key.
+     *
+     * @see SwitchClosure
+     *
+     * @param <E>  the type that the closure acts on
+     * @param objectsAndClosures  a map of objects to closures
+     * @return the closure
+     * @throws NullPointerException if the map is null
+     * @throws NullPointerException if any closure in the map is null
+     * @throws IllegalArgumentException if the map is empty
+     */
+    @SuppressWarnings("unchecked")
+    public static <E> Closure<E> switchMapClosure(final Map<? extends E, Closure<E>> objectsAndClosures) {
+        if (objectsAndClosures == null) {
+            throw new NullPointerException("The object and closure map must not be null");
+        }
+        final Closure<? super E> def = objectsAndClosures.remove(null);
+        final int size = objectsAndClosures.size();
+        final Closure<? super E>[] trs = new Closure[size];
+        final Predicate<E>[] preds = new Predicate[size];
+        int i = 0;
+        for (final Map.Entry<? extends E, Closure<E>> entry : objectsAndClosures.entrySet()) {
+            preds[i] = EqualPredicate.<E>equalPredicate(entry.getKey());
+            trs[i] = entry.getValue();
+            i++;
+        }
+        return ClosureUtils.<E>switchClosure(preds, trs, def);
+    }
+
+}

fine-commons-collections4/src/com/fr/third/org/apache/commons/collections4/ComparatorUtils.java

@@ -0,0 +1,239 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.fr.third.org.apache.commons.collections4;
+
+import java.util.Collection;
+import java.util.Comparator;
+
+import com.fr.third.org.apache.commons.collections4.comparators.BooleanComparator;
+import com.fr.third.org.apache.commons.collections4.comparators.ComparableComparator;
+import com.fr.third.org.apache.commons.collections4.comparators.ComparatorChain;
+import com.fr.third.org.apache.commons.collections4.comparators.NullComparator;
+import com.fr.third.org.apache.commons.collections4.comparators.ReverseComparator;
+import com.fr.third.org.apache.commons.collections4.comparators.TransformingComparator;
+
+/**
+ * Provides convenient static utility methods for <Code>Comparator</Code>
+ * objects.
+ * <p>
+ * Most of the functionality in this class can also be found in the
+ * <code>comparators</code> package. This class merely provides a
+ * convenient central place if you have use for more than one class
+ * in the <code>comparators</code> subpackage.
+ *
+ * @since 2.1
+ * @version $Id: ComparatorUtils.java 1591832 2014-05-02 08:58:40Z tn $
+ */
+public class ComparatorUtils {
+
+    /**
+     * ComparatorUtils should not normally be instantiated.
+     */
+    private ComparatorUtils() {}
+
+    /**
+     * Comparator for natural sort order.
+     *
+     * @see ComparableComparator#comparableComparator()
+     */
+    @SuppressWarnings({ "rawtypes", "unchecked" }) // explicit type needed for Java 1.5 compilation
+    public static final Comparator NATURAL_COMPARATOR = ComparableComparator.<Comparable>comparableComparator();
+
+    /**
+     * Gets a comparator that uses the natural order of the objects.
+     *
+     * @param <E>  the object type to compare
+     * @return  a comparator which uses natural order
+     */
+    @SuppressWarnings("unchecked")
+    public static <E extends Comparable<? super E>> Comparator<E> naturalComparator() {
+        return NATURAL_COMPARATOR;
+    }
+
+    /**
+     * Gets a comparator that compares using an array of {@link Comparator}s, applied
+     * in sequence until one returns not equal or the array is exhausted.
+     *
+     * @param <E>  the object type to compare
+     * @param comparators  the comparators to use, not null or empty or containing nulls
+     * @return a {@link ComparatorChain} formed from the input comparators
+     * @throws NullPointerException if comparators array is null or contains a null
+     * @see ComparatorChain
+     */
+    public static <E> Comparator<E> chainedComparator(final Comparator<E>... comparators) {
+        final ComparatorChain<E> chain = new ComparatorChain<E>();
+        for (final Comparator<E> comparator : comparators) {
+            if (comparator == null) {
+                throw new NullPointerException("Comparator cannot be null");
+            }
+            chain.addComparator(comparator);
+        }
+        return chain;
+    }
+
+    /**
+     * Gets a comparator that compares using a collection of {@link Comparator}s,
+     * applied in (default iterator) sequence until one returns not equal or the
+     * collection is exhausted.
+     *
+     * @param <E>  the object type to compare
+     * @param comparators  the comparators to use, not null or empty or containing nulls
+     * @return a {@link ComparatorChain} formed from the input comparators
+     * @throws NullPointerException if comparators collection is null or contains a null
+     * @throws ClassCastException if the comparators collection contains the wrong object type
+     * @see ComparatorChain
+     */
+    @SuppressWarnings("unchecked")
+    public static <E> Comparator<E> chainedComparator(final Collection<Comparator<E>> comparators) {
+        return chainedComparator(
+            (Comparator<E>[]) comparators.toArray(new Comparator[comparators.size()])
+        );
+    }
+
+    /**
+     * Gets a comparator that reverses the order of the given comparator.
+     *
+     * @param <E>  the object type to compare
+     * @param comparator  the comparator to reverse
+     * @return  a comparator that reverses the order of the input comparator
+     * @see ReverseComparator
+     */
+    public static <E> Comparator<E> reversedComparator(final Comparator<E> comparator) {
+        return new ReverseComparator<E>(comparator);
+    }
+
+    /**
+     * Gets a Comparator that can sort Boolean objects.
+     * <p>
+     * The parameter specifies whether true or false is sorted first.
+     * <p>
+     * The comparator throws NullPointerException if a null value is compared.
+     *
+     * @param trueFirst  when <code>true</code>, sort
+     *        <code>true</code> {@link Boolean}s before
+     *        <code>false</code> {@link Boolean}s.
+     * @return  a comparator that sorts booleans
+     */
+    public static Comparator<Boolean> booleanComparator(final boolean trueFirst) {
+        return BooleanComparator.booleanComparator(trueFirst);
+    }
+
+    /**
+     * Gets a Comparator that controls the comparison of <code>null</code> values.
+     * <p>
+     * The returned comparator will consider a null value to be less than
+     * any nonnull value, and equal to any other null value.  Two nonnull
+     * values will be evaluated with the given comparator.
+     *
+     * @param <E>  the object type to compare
+     * @param comparator the comparator that wants to allow nulls
+     * @return  a version of that comparator that allows nulls
+     * @see NullComparator
+     */
+    @SuppressWarnings("unchecked")
+    public static <E> Comparator<E> nullLowComparator(Comparator<E> comparator) {
+        if (comparator == null) {
+            comparator = NATURAL_COMPARATOR;
+        }
+        return new NullComparator<E>(comparator, false);
+    }
+
+    /**
+     * Gets a Comparator that controls the comparison of <code>null</code> values.
+     * <p>
+     * The returned comparator will consider a null value to be greater than
+     * any nonnull value, and equal to any other null value.  Two nonnull
+     * values will be evaluated with the given comparator.
+     *
+     * @param <E>  the object type to compare
+     * @param comparator the comparator that wants to allow nulls
+     * @return  a version of that comparator that allows nulls
+     * @see NullComparator
+     */
+    @SuppressWarnings("unchecked")
+    public static <E> Comparator<E> nullHighComparator(Comparator<E> comparator) {
+        if (comparator == null) {
+            comparator = NATURAL_COMPARATOR;
+        }
+        return new NullComparator<E>(comparator, true);
+    }
+
+    /**
+     * Gets a Comparator that passes transformed objects to the given comparator.
+     * <p>
+     * Objects passed to the returned comparator will first be transformed
+     * by the given transformer before they are compared by the given
+     * comparator.
+     *
+     * @param <I>  the input object type of the transformed comparator
+     * @param <O>  the object type of the decorated comparator
+     * @param comparator  the sort order to use
+     * @param transformer  the transformer to use
+     * @return  a comparator that transforms its input objects before comparing them
+     * @see  TransformingComparator
+     */
+    @SuppressWarnings("unchecked")
+    public static <I, O> Comparator<I> transformedComparator(Comparator<O> comparator,
+            final Transformer<? super I, ? extends O> transformer) {
+
+        if (comparator == null) {
+            comparator = NATURAL_COMPARATOR;
+        }
+        return new TransformingComparator<I, O>(transformer, comparator);
+    }
+
+    /**
+     * Returns the smaller of the given objects according to the given
+     * comparator, returning the second object if the comparator
+     * returns equal.
+     *
+     * @param <E>  the object type to compare
+     * @param o1  the first object to compare
+     * @param o2  the second object to compare
+     * @param comparator  the sort order to use
+     * @return  the smaller of the two objects
+     */
+    @SuppressWarnings("unchecked")
+    public static <E> E min(final E o1, final E o2, Comparator<E> comparator) {
+        if (comparator == null) {
+            comparator = NATURAL_COMPARATOR;
+        }
+        final int c = comparator.compare(o1, o2);
+        return c < 0 ? o1 : o2;
+    }
+
+    /**
+     * Returns the larger of the given objects according to the given
+     * comparator, returning the second object if the comparator
+     * returns equal.
+     *
+     * @param <E>  the object type to compare
+     * @param o1  the first object to compare
+     * @param o2  the second object to compare
+     * @param comparator  the sort order to use
+     * @return  the larger of the two objects
+     */
+    @SuppressWarnings("unchecked")
+    public static <E> E max(final E o1, final E o2, Comparator<E> comparator) {
+        if (comparator == null) {
+            comparator = NATURAL_COMPARATOR;
+        }
+        final int c = comparator.compare(o1, o2);
+        return c > 0 ? o1 : o2;
+    }
+
+}

fine-commons-collections4/src/com/fr/third/org/apache/commons/collections4/EnumerationUtils.java

@@ -0,0 +1,97 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.fr.third.org.apache.commons.collections4;
+
+import java.util.ArrayList;
+import java.util.Enumeration;
+import java.util.List;
+import java.util.StringTokenizer;
+
+import com.fr.third.org.apache.commons.collections4.iterators.EnumerationIterator;
+
+/**
+ * Provides utility methods for {@link Enumeration} instances.
+ *
+ * @since 3.0
+ * @version $Id: EnumerationUtils.java 1683009 2015-06-01 21:53:01Z tn $
+ */
+public class EnumerationUtils {
+
+    /**
+     * EnumerationUtils is not normally instantiated.
+     */
+    private EnumerationUtils() {}
+
+    /**
+     * Returns the <code>index</code>-th value in the {@link Enumeration}, throwing
+     * <code>IndexOutOfBoundsException</code> if there is no such element.
+     * <p>
+     * The Enumeration is advanced to <code>index</code> (or to the end, if
+     * <code>index</code> exceeds the number of entries) as a side effect of this method.
+     *
+     * @param e  the enumeration to get a value from
+     * @param index  the index to get
+     * @param <T> the type of object in the {@link Enumeration}
+     * @return the object at the specified index
+     * @throws IndexOutOfBoundsException if the index is invalid
+     * @throws IllegalArgumentException if the object type is invalid
+     * @since 4.1
+     */
+    public static <T> T get(final Enumeration<T> e, final int index) {
+        int i = index;
+        CollectionUtils.checkIndexBounds(i);
+        while (e.hasMoreElements()) {
+            i--;
+            if (i == -1) {
+                return e.nextElement();
+            } else {
+                e.nextElement();
+            }
+        }
+        throw new IndexOutOfBoundsException("Entry does not exist: " + i);
+    }
+
+    /**
+     * Creates a list based on an enumeration.
+     *
+     * <p>As the enumeration is traversed, an ArrayList of its values is
+     * created. The new list is returned.</p>
+     *
+     * @param <E> the element type
+     * @param enumeration  the enumeration to traverse, which should not be <code>null</code>.
+     * @return a list containing all elements of the given enumeration
+     * @throws NullPointerException if the enumeration parameter is <code>null</code>.
+     */
+    public static <E> List<E> toList(final Enumeration<? extends E> enumeration) {
+        return IteratorUtils.toList(new EnumerationIterator<E>(enumeration));
+    }
+
+    /**
+     * Override toList(Enumeration) for StringTokenizer as it implements Enumeration&lt;Object&gt;
+     * for the sake of backward compatibility.
+     *
+     * @param stringTokenizer  the tokenizer to convert to a {@link List}&lt;{@link String}&gt;
+     * @return a list containing all tokens of the given StringTokenizer
+     */
+    public static List<String> toList(final StringTokenizer stringTokenizer) {
+        final List<String> result = new ArrayList<String>(stringTokenizer.countTokens());
+        while (stringTokenizer.hasMoreTokens()) {
+            result.add(stringTokenizer.nextToken());
+        }
+        return result;
+    }
+}

fine-commons-collections4/src/com/fr/third/org/apache/commons/collections4/Equator.java

@@ -0,0 +1,45 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more contributor license
+ * agreements. See the NOTICE file distributed with this work for additional information regarding
+ * copyright ownership. The ASF licenses this file to You under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the License. You may obtain a
+ * copy of the License at http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable
+ * law or agreed to in writing, software distributed under the License is distributed on an "AS IS"
+ * BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License
+ * for the specific language governing permissions and limitations under the License.
+ */
+package com.fr.third.org.apache.commons.collections4;
+
+import com.fr.third.org.apache.commons.collections4.map.HashedMap;
+
+/**
+ * An equation function, which determines equality between objects of type T.
+ * <p>
+ * It is the functional sibling of {@link java.util.Comparator}; {@link Equator} is to
+ * {@link Object} as {@link java.util.Comparator} is to {@link java.lang.Comparable}.
+ *
+ * @param <T> the types of object this {@link Equator} can evaluate.
+ * @since 4.0
+ * @version $Id: Equator.java 1540567 2013-11-10 22:19:29Z tn $
+ */
+public interface Equator<T> {
+    /**
+     * Evaluates the two arguments for their equality.
+     *
+     * @param o1 the first object to be equated.
+     * @param o2 the second object to be equated.
+     * @return whether the two objects are equal.
+     */
+    boolean equate(T o1, T o2);
+
+    /**
+     * Calculates the hash for the object, based on the method of equality used in the equate
+     * method. This is used for classes that delegate their {@link Object#equals(Object) equals(Object)} method to an
+     * Equator (and so must also delegate their {@link Object#hashCode() hashCode()} method), or for implementations
+     * of {@link HashedMap} that use an Equator for the key objects.
+     *
+     * @param o the object to calculate the hash for.
+     * @return the hash of the object.
+     */
+    int hash(T o);
+}

fine-commons-collections4/src/com/fr/third/org/apache/commons/collections4/Factory.java

@@ -0,0 +1,44 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.fr.third.org.apache.commons.collections4;
+
+/**
+ * Defines a functor interface implemented by classes that create objects.
+ * <p>
+ * A <code>Factory</code> creates an object without using an input parameter.
+ * If an input parameter is required, then {@link Transformer} is more appropriate.
+ * <p>
+ * Standard implementations of common factories are provided by
+ * {@link FactoryUtils}. These include factories that return a constant,
+ * a copy of a prototype or a new instance.
+ *
+ * @param <T> the type that the factory creates
+ *
+ * @since 2.1
+ * @version $Id: Factory.java 1543256 2013-11-19 00:45:38Z ggregory $
+ */
+public interface Factory<T> {
+
+    /**
+     * Create a new object.
+     *
+     * @return a new object
+     * @throws FunctorException (runtime) if the factory cannot create an object
+     */
+    T create();
+
+}

fine-commons-collections4/src/com/fr/third/org/apache/commons/collections4/FactoryUtils.java

@@ -0,0 +1,154 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.fr.third.org.apache.commons.collections4;
+
+import com.fr.third.org.apache.commons.collections4.functors.ConstantFactory;
+import com.fr.third.org.apache.commons.collections4.functors.ExceptionFactory;
+import com.fr.third.org.apache.commons.collections4.functors.InstantiateFactory;
+import com.fr.third.org.apache.commons.collections4.functors.PrototypeFactory;
+import com.fr.third.org.apache.commons.collections4.functors.ConstantFactory;
+import com.fr.third.org.apache.commons.collections4.functors.ExceptionFactory;
+import com.fr.third.org.apache.commons.collections4.functors.InstantiateFactory;
+import com.fr.third.org.apache.commons.collections4.functors.PrototypeFactory;
+
+/**
+ * <code>FactoryUtils</code> provides reference implementations and utilities
+ * for the Factory functor interface. The supplied factories are:
+ * <ul>
+ * <li>Prototype - clones a specified object
+ * <li>Instantiate - creates objects using reflection
+ * <li>Constant - always returns the same object
+ * <li>Null - always returns null
+ * <li>Exception - always throws an exception
+ * </ul>
+ * <p>
+ * Since v4.1 only factories which are considered to be unsafe are
+ * Serializable. Factories considered to be unsafe for serialization are:
+ * <ul>
+ * <li>Prototype
+ * <li>Instantiate
+ * </ul>
+ *
+ * @since 3.0
+ * @version $Id: FactoryUtils.java 1714362 2015-11-14 20:38:02Z tn $
+ */
+public class FactoryUtils {
+
+    /**
+     * This class is not normally instantiated.
+     */
+    private FactoryUtils() {}
+
+    /**
+     * Gets a Factory that always throws an exception.
+     * This could be useful during testing as a placeholder.
+     *
+     * @see ExceptionFactory
+     *
+     * @param <T> the type that the factory creates
+     * @return the factory
+     */
+    public static <T> Factory<T> exceptionFactory() {
+        return ExceptionFactory.<T>exceptionFactory();
+    }
+
+    /**
+     * Gets a Factory that will return null each time the factory is used.
+     * This could be useful during testing as a placeholder.
+     *
+     * @see ConstantFactory
+     * @param <T> the "type" of null object the factory should return.
+     * @return the factory
+     */
+    public static <T> Factory<T> nullFactory() {
+        return ConstantFactory.<T>constantFactory(null);
+    }
+
+    /**
+     * Creates a Factory that will return the same object each time the factory
+     * is used. No check is made that the object is immutable. In general, only
+     * immutable objects should use the constant factory. Mutable objects should
+     * use the prototype factory.
+     *
+     * @see ConstantFactory
+     *
+     * @param <T> the type that the factory creates
+     * @param constantToReturn  the constant object to return each time in the factory
+     * @return the <code>constant</code> factory.
+     */
+    public static <T> Factory<T> constantFactory(final T constantToReturn) {
+        return ConstantFactory.constantFactory(constantToReturn);
+    }
+
+    /**
+     * Creates a Factory that will return a clone of the same prototype object
+     * each time the factory is used. The prototype will be cloned using one of these
+     * techniques (in order):
+     * <ul>
+     * <li>public clone method
+     * <li>public copy constructor
+     * <li>serialization clone
+     * <ul>
+     *
+     * @see PrototypeFactory
+     *
+     * @param <T> the type that the factory creates
+     * @param prototype  the object to clone each time in the factory
+     * @return the <code>prototype</code> factory, or a {@link ConstantFactory#NULL_INSTANCE} if
+     * the {@code prototype} is {@code null}
+     * @throws IllegalArgumentException if the prototype cannot be cloned
+     */
+    public static <T> Factory<T> prototypeFactory(final T prototype) {
+        return PrototypeFactory.<T>prototypeFactory(prototype);
+    }
+
+    /**
+     * Creates a Factory that can create objects of a specific type using
+     * a no-args constructor.
+     *
+     * @see InstantiateFactory
+     *
+     * @param <T> the type that the factory creates
+     * @param classToInstantiate  the Class to instantiate each time in the factory
+     * @return the <code>reflection</code> factory
+     * @throws NullPointerException if the classToInstantiate is null
+     */
+    public static <T> Factory<T> instantiateFactory(final Class<T> classToInstantiate) {
+        return InstantiateFactory.instantiateFactory(classToInstantiate, null, null);
+    }
+
+    /**
+     * Creates a Factory that can create objects of a specific type using
+     * the arguments specified to this method.
+     *
+     * @see InstantiateFactory
+     *
+     * @param <T> the type that the factory creates
+     * @param classToInstantiate  the Class to instantiate each time in the factory
+     * @param paramTypes  parameter types for the constructor, can be null
+     * @param args  the arguments to pass to the constructor, can be null
+     * @return the <code>reflection</code> factory
+     * @throws NullPointerException if the classToInstantiate is null
+     * @throws IllegalArgumentException if the paramTypes and args don't match
+     * @throws IllegalArgumentException if the constructor doesn't exist
+     */
+    public static <T> Factory<T> instantiateFactory(final Class<T> classToInstantiate, final Class<?>[] paramTypes,
+                                                    final Object[] args) {
+        return InstantiateFactory.instantiateFactory(classToInstantiate, paramTypes, args);
+    }
+
+}

fine-commons-collections4/src/com/fr/third/org/apache/commons/collections4/FluentIterable.java

@@ -0,0 +1,505 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.fr.third.org.apache.commons.collections4;
+
+import java.util.Arrays;
+import java.util.Collection;
+import java.util.Comparator;
+import java.util.Enumeration;
+import java.util.Iterator;
+import java.util.List;
+
+import com.fr.third.org.apache.commons.collections4.iterators.SingletonIterator;
+
+/**
+ * A FluentIterable provides a powerful yet simple API for manipulating
+ * Iterable instances in a fluent manner.
+ * <p>
+ * A FluentIterable can be created either from an Iterable or from a set
+ * of elements. The following types of methods are provided:
+ * <ul>
+ *   <li>fluent methods which return a new {@code FluentIterable} instance,
+ *       providing a view of the original iterable (e.g. filter(Predicate));
+ *   <li>conversion methods which copy the FluentIterable's contents into a
+ *       new collection or array (e.g. toList());
+ *   <li>utility methods which answer questions about the FluentIterable's
+ *       contents (e.g. size(), anyMatch(Predicate)).
+ *   <li>
+ * </ul>
+ * <p>
+ * The following example outputs the first 3 even numbers in the range [1, 10]
+ * into a list:
+ * <pre>
+ * List&lt;String&gt; result =
+ *   FluentIterable
+ *       .of(1, 2, 3, 4, 5, 6, 7, 8, 9, 10)
+ *       .filter(new Predicate<Integer>() {
+ *                   public boolean evaluate(Integer number) {
+ *                        return number % 2 == 0;
+ *                   }
+ *              )
+ *       .transform(TransformerUtils.stringValueTransformer())
+ *       .limit(3)
+ *       .toList();
+ * </pre>
+ * The resulting list will contain the following elements:
+ * <pre>[2, 4, 6]</pre>
+ *
+ * @param <E>  the element type
+ * @since 4.1
+ * @version $Id: FluentIterable.java 1684264 2015-06-08 20:06:29Z tn $
+ */
+public class FluentIterable<E> implements Iterable<E> {
+
+    /** A reference to the wrapped iterable. */
+    private final Iterable<E> iterable;
+
+    // Static factory methods
+    // ----------------------------------------------------------------------
+
+    /**
+     * Creates a new empty FluentIterable.
+     *
+     * @param <T>  the element type
+     * @return a new empty FluentIterable
+     */
+    @SuppressWarnings("unchecked")
+    public static <T> FluentIterable<T> empty() {
+        return IterableUtils.EMPTY_ITERABLE;
+    }
+
+    /**
+     * Creates a new FluentIterable of the single provided element.
+     * <p>
+     * The returned iterable's iterator does not support {@code remove()}.
+     *
+     * @param <T>  the element type
+     * @param singleton  the singleton element
+     * @return a new FluentIterable containing the singleton
+     */
+    public static <T> FluentIterable<T> of(final T singleton) {
+        return of(IteratorUtils.asIterable(new SingletonIterator<T>(singleton, false)));
+    }
+
+    /**
+     * Creates a new FluentIterable from the provided elements.
+     * <p>
+     * The returned iterable's iterator does not support {@code remove()}.
+     *
+     * @param <T>  the element type
+     * @param elements  the elements to be contained in the FluentIterable
+     * @return a new FluentIterable containing the provided elements
+     */
+    public static <T> FluentIterable<T> of(final T... elements) {
+        return of(Arrays.asList(elements));
+    }
+
+    /**
+     * Construct a new FluentIterable from the provided iterable. If the
+     * iterable is already an instance of FluentIterable, the instance
+     * will be returned instead.
+     * <p>
+     * The returned iterable's iterator supports {@code remove()} when the
+     * corresponding input iterator supports it.
+     *
+     * @param <T>  the element type
+     * @param iterable  the iterable to wrap into a FluentIterable, may not be null
+     * @return a new FluentIterable wrapping the provided iterable
+     * @throws NullPointerException if iterable is null
+     */
+    public static <T> FluentIterable<T> of(final Iterable<T> iterable) {
+        IterableUtils.checkNotNull(iterable);
+        if (iterable instanceof FluentIterable<?>) {
+            return (FluentIterable<T>) iterable;
+        } else {
+            return new FluentIterable<T>(iterable);
+        }
+    }
+
+    // Constructor
+    // ----------------------------------------------------------------------
+
+    /**
+     * Package-private constructor, used by IterableUtils.
+     */
+    FluentIterable() {
+        this.iterable = this;
+    }
+
+    /**
+     * Create a new FluentIterable by wrapping the provided iterable.
+     * @param iterable  the iterable to wrap
+     */
+    private FluentIterable(final Iterable<E> iterable) {
+        this.iterable = iterable;
+    }
+
+    // fluent construction methods
+    // ----------------------------------------------------------------------
+
+    /**
+     * Returns a new FluentIterable whose iterator will first traverse
+     * the elements of the current iterable, followed by the provided
+     * elements.
+     *
+     * @param elements  the elements to append to the iterable
+     * @return a new iterable, combining this iterable with the elements
+     */
+    public FluentIterable<E> append(final E... elements) {
+        return append(Arrays.asList(elements));
+    }
+
+    /**
+     * Returns a new FluentIterable whose iterator will first traverse
+     * the elements of the current iterable, followed by the elements
+     * of the provided iterable.
+     *
+     * @param other  the other iterable to combine, may not be null
+     * @return a new iterable, combining this iterable with other
+     * @throws NullPointerException if other is null
+     */
+    public FluentIterable<E> append(final Iterable<? extends E> other) {
+        return of(IterableUtils.chainedIterable(iterable, other));
+    }
+
+    /**
+     * Returns a new FluentIterable whose iterator will traverse the
+     * elements of the current and provided iterable in natural order.
+     * <p>
+     * Example: natural ordering
+     * <ul>
+     *   <li>this contains elements [1, 3, 5, 7]
+     *   <li>other contains elements [2, 4, 6, 8]
+     * </ul>
+     * <p>
+     * The returned iterable will traverse the elements in the following
+     * order: [1, 2, 3, 4, 5, 6, 7, 8]
+     *
+     * @param other  the other iterable to collate, may not be null
+     * @return a new iterable, collating this iterable with the other in natural order
+     * @throws NullPointerException if other is null
+     * @see {@link org.apache.commons.collections4.iterators.CollatingIterator CollatingIterator}
+     */
+    public FluentIterable<E> collate(final Iterable<? extends E> other) {
+        return of(IterableUtils.collatedIterable(iterable, other));
+    }
+
+    /**
+     * Returns a new FluentIterable whose iterator will traverse the
+     * elements of the current and provided iterable according to the
+     * ordering defined by an comparator.
+     * <p>
+     * Example: descending order
+     * <ul>
+     *   <li>this contains elements [7, 5, 3, 1]
+     *   <li>other contains elements [8, 6, 4, 2]
+     * </ul>
+     * <p>
+     * The returned iterable will traverse the elements in the following
+     * order: [8, 7, 6, 5, 4, 3, 2, 1]
+     *
+     * @param comparator  the comparator to define an ordering, may be null,
+     *   in which case natural ordering will be used
+     * @param other  the other iterable to collate, may not be null
+     * @return a new iterable, collating this iterable with the other in natural order
+     * @throws NullPointerException if other is null
+     * @see {@link org.apache.commons.collections4.iterators.CollatingIterator CollatingIterator}
+     */
+    public FluentIterable<E> collate(final Iterable<? extends E> other,
+                                     final Comparator<? super E> comparator) {
+        return of(IterableUtils.collatedIterable(comparator, iterable, other));
+    }
+
+    /**
+     * This method fully traverses an iterator of this iterable and returns
+     * a new iterable with the same contents, but without any reference
+     * to the originating iterables and/or iterators.
+     * <p>
+     * Calling this method is equivalent to:
+     * <pre>
+     *   FluentIterable<E> someIterable = ...;
+     *   FluentIterable.of(someIterable.toList());
+     * </pre>
+     *
+     * @return a new iterable with the same contents as this iterable
+     */
+    public FluentIterable<E> eval() {
+        return of(toList());
+    }
+
+    /**
+     * Returns a new FluentIterable whose iterator will only return
+     * elements from this iterable matching the provided predicate.
+     *
+     * @param predicate  the predicate used to filter elements
+     * @return a new iterable, providing a filtered view of this iterable
+     * @throws NullPointerException if predicate is null
+     */
+    public FluentIterable<E> filter(final Predicate<? super E> predicate) {
+        return of(IterableUtils.filteredIterable(iterable, predicate));
+    }
+
+    /**
+     * Returns a new FluentIterable whose iterator will return at most
+     * the provided maximum number of elements from this iterable.
+     *
+     * @param maxSize  the maximum number of elements
+     * @return a new iterable, providing a bounded view of this iterable
+     * @throws IllegalArgumentException if maxSize is negative
+     */
+    public FluentIterable<E> limit(final long maxSize) {
+        return of(IterableUtils.boundedIterable(iterable, maxSize));
+    }
+
+    /**
+     * Returns a new FluentIterable whose iterator will loop infinitely
+     * over the elements from this iterable.
+     *
+     * @return a new iterable, providing a looping view of this iterable
+     */
+    public FluentIterable<E> loop() {
+        return of(IterableUtils.loopingIterable(iterable));
+    }
+
+    /**
+     * Returns a new FluentIterable whose iterator will traverse the
+     * elements from this iterable in reverse order.
+     *
+     * @return a new iterable, providing a reversed view of this iterable
+     */
+    public FluentIterable<E> reverse() {
+        return of(IterableUtils.reversedIterable(iterable));
+    }
+
+    /**
+     * Returns a new FluentIterable whose iterator will skip the first
+     * N elements from this iterable.
+     *
+     * @param elementsToSkip  the number of elements to skip
+     * @return a new iterable, providing a view of this iterable by skipping
+     *   the first N elements
+     * @throws IllegalArgumentException if elementsToSkip is negative
+     */
+    public FluentIterable<E> skip(final long elementsToSkip) {
+        return of(IterableUtils.skippingIterable(iterable, elementsToSkip));
+    }
+
+    /**
+     * Returns a new FluentIterable whose iterator will return all elements
+     * of this iterable transformed by the provided transformer.
+     *
+     * @param <O>  the output element type
+     * @param transformer  the transformer applied to each element
+     * @return a new iterable, providing a transformed view of this iterable
+     * @throws NullPointerException if transformer is null
+     */
+    public <O> FluentIterable<O> transform(final Transformer<? super E, ? extends O> transformer) {
+        return of(IterableUtils.transformedIterable(iterable, transformer));
+    }
+
+    /**
+     * Returns a new FluentIterable whose iterator will return a unique view
+     * of this iterable.
+     *
+     * @return a new iterable, providing a unique view of this iterable
+     */
+    public FluentIterable<E> unique() {
+        return of(IterableUtils.uniqueIterable(iterable));
+    }
+
+    /**
+     * Returns a new FluentIterable whose iterator will return an unmodifiable
+     * view of this iterable.
+     *
+     * @return a new iterable, providing an unmodifiable view of this iterable
+     */
+    public FluentIterable<E> unmodifiable() {
+        return of(IterableUtils.unmodifiableIterable(iterable));
+    }
+
+    /**
+     * Returns a new FluentIterable whose iterator will traverse
+     * the elements of this iterable and the other iterable in
+     * alternating order.
+     *
+     * @param other  the other iterable to interleave, may not be null
+     * @return a new iterable, interleaving this iterable with others
+     * @throws NullPointerException if other is null
+     */
+    public FluentIterable<E> zip(final Iterable<? extends E> other) {
+        return of(IterableUtils.zippingIterable(iterable, other));
+    }
+
+    /**
+     * Returns a new FluentIterable whose iterator will traverse
+     * the elements of this iterable and the other iterables in
+     * alternating order.
+     *
+     * @param others  the iterables to interleave, may not be null
+     * @return a new iterable, interleaving this iterable with others
+     * @throws NullPointerException if either of the provided iterables is null
+     */
+    public FluentIterable<E> zip(final Iterable<? extends E>... others) {
+        return of(IterableUtils.zippingIterable(iterable, others));
+    }
+
+    // convenience methods
+    // ----------------------------------------------------------------------
+
+    /** {@inheritDoc} */
+    @Override
+    public Iterator<E> iterator() {
+        return iterable.iterator();
+    }
+
+    /**
+     * Returns an Enumeration that will enumerate all elements contained
+     * in this iterable.
+     *
+     * @return an Enumeration over the elements of this iterable
+     */
+    public Enumeration<E> asEnumeration() {
+        return IteratorUtils.asEnumeration(iterator());
+    }
+
+    /**
+     * Checks if all elements contained in this iterable are matching the
+     * provided predicate.
+     * <p>
+     * A <code>null</code> or empty iterable returns true.
+     *
+     * @param predicate  the predicate to use, may not be null
+     * @return true if all elements contained in this iterable match the predicate,
+     *   false otherwise
+     * @throws NullPointerException if predicate is null
+     */
+    public boolean allMatch(final Predicate<? super E> predicate) {
+        return IterableUtils.matchesAll(iterable, predicate);
+    }
+
+    /**
+     * Checks if this iterable contains any element matching the provided predicate.
+     * <p>
+     * A <code>null</code> or empty iterable returns false.
+     *
+     * @param predicate  the predicate to use, may not be null
+     * @return true if at least one element contained in this iterable matches the predicate,
+     *   false otherwise
+     * @throws NullPointerException if predicate is null
+     */
+    public boolean anyMatch(final Predicate<? super E> predicate) {
+        return IterableUtils.matchesAny(iterable, predicate);
+    }
+
+    /**
+     * Checks if this iterable is empty.
+     *
+     * @return true if this iterable does not contain any elements, false otherwise
+     */
+    public boolean isEmpty() {
+        return IterableUtils.isEmpty(iterable);
+    }
+
+    /**
+     * Checks if the object is contained in this iterable.
+     *
+     * @param object  the object to check
+     * @return true if the object is contained in this iterable, false otherwise
+     */
+    public boolean contains(final Object object) {
+        return IterableUtils.contains(iterable, object);
+    }
+
+    /**
+     * Applies the closure to all elements contained in this iterable.
+     *
+     * @param closure  the closure to apply to each element, may not be null
+     * @throws NullPointerException if closure is null
+     */
+    public void forEach(final Closure<? super E> closure) {
+        IterableUtils.forEach(iterable, closure);
+    }
+
+    /**
+     * Returns the element at the provided position in this iterable.
+     * In order to return the element, an iterator needs to be traversed
+     * up to the requested position.
+     *
+     * @param position  the position of the element to return
+     * @return the element
+     * @throws IndexOutOfBoundsException if the provided position is outside the
+     *   valid range of this iterable: [0, size)
+     */
+    public E get(final int position) {
+        return IterableUtils.get(iterable, position);
+    }
+
+    /**
+     * Returns the number of elements that are contained in this iterable.
+     * In order to determine the size, an iterator needs to be traversed.
+     *
+     * @return the size of this iterable
+     */
+    public int size() {
+        return IterableUtils.size(iterable);
+    }
+
+    /**
+     * Traverses an iterator of this iterable and adds all elements
+     * to the provided collection.
+     *
+     * @param collection  the collection to add the elements
+     * @throws NullPointerException if collection is null
+     */
+    public void copyInto(final Collection<? super E> collection) {
+        if (collection == null) {
+            throw new NullPointerException("Collection must not be null");
+        }
+        CollectionUtils.addAll(collection, iterable);
+    }
+
+    /**
+     * Returns an array containing all elements of this iterable by traversing
+     * its iterator.
+     *
+     * @param arrayClass  the class of array to create
+     * @return an array of the iterable contents
+     * @throws ArrayStoreException if arrayClass is invalid
+     */
+    public E[] toArray(final Class<E> arrayClass) {
+        return IteratorUtils.toArray(iterator(), arrayClass);
+    }
+
+    /**
+     * Returns a mutable list containing all elements of this iterable
+     * by traversing its iterator.
+     * <p>
+     * The returned list is guaranteed to be mutable.
+     *
+     * @return a list of the iterable contents
+     */
+    public List<E> toList() {
+        return IterableUtils.toList(iterable);
+    }
+
+    /** {@inheritDoc} */
+    @Override
+    public String toString() {
+        return IterableUtils.toString(iterable);
+    }
+
+}

fine-commons-collections4/src/com/fr/third/org/apache/commons/collections4/FunctorException.java

@@ -0,0 +1,72 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.fr.third.org.apache.commons.collections4;
+
+/**
+ * Runtime exception thrown from functors.
+ * If required, a root cause error can be wrapped within this one.
+ *
+ * @since 3.0
+ * @version $Id: FunctorException.java 1477779 2013-04-30 18:55:24Z tn $
+ */
+public class FunctorException extends RuntimeException {
+
+    /** Serialization version */
+    private static final long serialVersionUID = -4704772662059351193L;
+
+    /**
+     * Constructs a new <code>FunctorException</code> without specified
+     * detail message.
+     */
+    public FunctorException() {
+        super();
+    }
+
+    /**
+     * Constructs a new <code>FunctorException</code> with specified
+     * detail message.
+     *
+     * @param msg  the error message.
+     */
+    public FunctorException(final String msg) {
+        super(msg);
+    }
+
+    /**
+     * Constructs a new <code>FunctorException</code> with specified
+     * nested <code>Throwable</code> root cause.
+     *
+     * @param rootCause  the exception or error that caused this exception
+     *                   to be thrown.
+     */
+    public FunctorException(final Throwable rootCause) {
+        super(rootCause);
+    }
+
+    /**
+     * Constructs a new <code>FunctorException</code> with specified
+     * detail message and nested <code>Throwable</code> root cause.
+     *
+     * @param msg        the error message.
+     * @param rootCause  the exception or error that caused this exception
+     *                   to be thrown.
+     */
+    public FunctorException(final String msg, final Throwable rootCause) {
+        super(msg, rootCause);
+    }
+
+}

fine-commons-collections4/src/com/fr/third/org/apache/commons/collections4/Get.java

@@ -0,0 +1,77 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.fr.third.org.apache.commons.collections4;
+
+import java.util.Collection;
+import java.util.Set;
+
+/**
+ * The "read" subset of the {@link java.util.Map} interface.
+ *
+ * @since 4.0
+ * @version $Id: Get.java 1543265 2013-11-19 00:48:44Z ggregory $
+ *
+ * @see Put
+ */
+public interface Get<K, V> {
+
+    /**
+     * @see java.util.Map#containsKey(Object)
+     */
+    boolean containsKey(Object key);
+
+    /**
+     * @see java.util.Map#containsValue(Object)
+     */
+    boolean containsValue(Object value);
+
+    /**
+     * @see java.util.Map#entrySet()
+     */
+    Set<java.util.Map.Entry<K, V>> entrySet();
+
+    /**
+     * @see java.util.Map#get(Object)
+     */
+    V get(Object key);
+
+    /**
+     * @see java.util.Map#remove(Object)
+     */
+    V remove(Object key);
+
+    /**
+     * @see java.util.Map#isEmpty()
+     */
+    boolean isEmpty();
+
+    /**
+     * @see java.util.Map#keySet()
+     */
+    Set<K> keySet();
+
+    /**
+     * @see java.util.Map#size()
+     */
+    int size();
+
+    /**
+     * @see java.util.Map#values()
+     */
+    Collection<V> values();
+
+}

fine-commons-collections4/src/com/fr/third/org/apache/commons/collections4/IterableGet.java

@@ -0,0 +1,47 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.fr.third.org.apache.commons.collections4;
+
+/**
+ * The "read" subset of the {@link java.util.Map} interface.
+ *
+ * @since 4.0
+ * @version $Id: IterableGet.java 1477779 2013-04-30 18:55:24Z tn $
+ *
+ * @see Put
+ */
+public interface IterableGet<K, V> extends Get<K, V> {
+    /**
+     * Obtains a <code>MapIterator</code> over the map.
+     * <p>
+     * A map iterator is an efficient way of iterating over maps.
+     * There is no need to access the entry set or use Map Entry objects.
+     * <pre>
+     * IterableMap<String,Integer> map = new HashedMap<String,Integer>();
+     * MapIterator<String,Integer> it = map.mapIterator();
+     * while (it.hasNext()) {
+     *   String key = it.next();
+     *   Integer value = it.getValue();
+     *   it.setValue(value + 1);
+     * }
+     * </pre>
+     *
+     * @return a map iterator
+     */
+    MapIterator<K, V> mapIterator();
+
+}

fine-commons-collections4/src/com/fr/third/org/apache/commons/collections4/IterableMap.java

@@ -0,0 +1,43 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.fr.third.org.apache.commons.collections4;
+
+import java.util.Map;
+
+/**
+ * Defines a map that can be iterated directly without needing to create an entry set.
+ * <p>
+ * A map iterator is an efficient way of iterating over maps.
+ * There is no need to access the entry set or use Map Entry objects.
+ * <pre>
+ * IterableMap<String,Integer> map = new HashedMap<String,Integer>();
+ * MapIterator<String,Integer> it = map.mapIterator();
+ * while (it.hasNext()) {
+ *   String key = it.next();
+ *   Integer value = it.getValue();
+ *   it.setValue(value + 1);
+ * }
+ * </pre>
+ *
+ * @param <K> the type of the keys in the map
+ * @param <V> the type of the values in the map
+ *
+ * @since 3.0
+ * @version $Id: IterableMap.java 1469004 2013-04-17 17:37:03Z tn $
+ */
+public interface IterableMap<K, V> extends Map<K, V>, Put<K, V>, IterableGet<K, V> {
+}

fine-commons-collections4/src/com/fr/third/org/apache/commons/collections4/IterableSortedMap.java

@@ -0,0 +1,31 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.fr.third.org.apache.commons.collections4;
+
+import java.util.SortedMap;
+
+/**
+ * {@link SortedMap} + {@link OrderedMap}.
+ *
+ * @param <K> the type of the keys in the map
+ * @param <V> the type of the values in the map
+ *
+ * @since 4.0
+ * @version $Id: IterableSortedMap.java 1469004 2013-04-17 17:37:03Z tn $
+ */
+public interface IterableSortedMap<K, V> extends SortedMap<K, V>, OrderedMap<K, V> {
+}

fine-commons-collections4/src/com/fr/third/org/apache/commons/collections4/KeyValue.java

@@ -0,0 +1,47 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.fr.third.org.apache.commons.collections4;
+
+/**
+ * Defines a simple key value pair.
+ * <p>
+ * A Map Entry has considerable additional semantics over and above a simple
+ * key-value pair. This interface defines the minimum key value, with just the
+ * two get methods.
+ *
+ * @param <K> the type of the key
+ * @param <V> the type of the value
+ * @since 3.0
+ * @version $Id: KeyValue.java 1477779 2013-04-30 18:55:24Z tn $
+ */
+public interface KeyValue<K, V> {
+
+    /**
+     * Gets the key from the pair.
+     *
+     * @return the key
+     */
+    K getKey();
+
+    /**
+     * Gets the value from the pair.
+     *
+     * @return the value
+     */
+    V getValue();
+
+}

fine-commons-collections4/src/com/fr/third/org/apache/commons/collections4/ListUtils.java

@@ -0,0 +1,709 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.fr.third.org.apache.commons.collections4;
+
+import java.util.AbstractList;
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.HashSet;
+import java.util.Iterator;
+import java.util.List;
+
+import com.fr.third.org.apache.commons.collections4.bag.HashBag;
+import com.fr.third.org.apache.commons.collections4.functors.DefaultEquator;
+import com.fr.third.org.apache.commons.collections4.list.FixedSizeList;
+import com.fr.third.org.apache.commons.collections4.list.LazyList;
+import com.fr.third.org.apache.commons.collections4.list.PredicatedList;
+import com.fr.third.org.apache.commons.collections4.list.TransformedList;
+import com.fr.third.org.apache.commons.collections4.list.UnmodifiableList;
+import com.fr.third.org.apache.commons.collections4.sequence.CommandVisitor;
+import com.fr.third.org.apache.commons.collections4.sequence.EditScript;
+import com.fr.third.org.apache.commons.collections4.sequence.SequencesComparator;
+import com.fr.third.org.apache.commons.collections4.bag.HashBag;
+import com.fr.third.org.apache.commons.collections4.functors.DefaultEquator;
+import com.fr.third.org.apache.commons.collections4.list.FixedSizeList;
+import com.fr.third.org.apache.commons.collections4.list.LazyList;
+import com.fr.third.org.apache.commons.collections4.list.PredicatedList;
+import com.fr.third.org.apache.commons.collections4.list.TransformedList;
+import com.fr.third.org.apache.commons.collections4.list.UnmodifiableList;
+import com.fr.third.org.apache.commons.collections4.sequence.CommandVisitor;
+import com.fr.third.org.apache.commons.collections4.sequence.EditScript;
+import com.fr.third.org.apache.commons.collections4.sequence.SequencesComparator;
+
+/**
+ * Provides utility methods and decorators for {@link List} instances.
+ *
+ * @since 1.0
+ * @version $Id: ListUtils.java 1686855 2015-06-22 13:00:27Z tn $
+ */
+public class ListUtils {
+
+    /**
+     * <code>ListUtils</code> should not normally be instantiated.
+     */
+    private ListUtils() {}
+
+    //-----------------------------------------------------------------------
+
+    /**
+     * Returns an immutable empty list if the argument is <code>null</code>,
+     * or the argument itself otherwise.
+     *
+     * @param <T> the element type
+     * @param list the list, possibly <code>null</code>
+     * @return an empty list if the argument is <code>null</code>
+     */
+    public static <T> List<T> emptyIfNull(final List<T> list) {
+        return list == null ? Collections.<T>emptyList() : list;
+    }
+
+    /**
+     * Returns either the passed in list, or if the list is {@code null},
+     * the value of {@code defaultList}.
+     *
+     * @param <T> the element type
+     * @param list  the list, possibly {@code null}
+     * @param defaultList  the returned values if list is {@code null}
+     * @return an empty list if the argument is <code>null</code>
+     * @since 4.0
+     */
+    public static <T> List<T> defaultIfNull(final List<T> list, final List<T> defaultList) {
+        return list == null ? defaultList : list;
+    }
+
+    /**
+     * Returns a new list containing all elements that are contained in
+     * both given lists.
+     *
+     * @param <E> the element type
+     * @param list1  the first list
+     * @param list2  the second list
+     * @return  the intersection of those two lists
+     * @throws NullPointerException if either list is null
+     */
+    public static <E> List<E> intersection(final List<? extends E> list1, final List<? extends E> list2) {
+        final List<E> result = new ArrayList<E>();
+
+        List<? extends E> smaller = list1;
+        List<? extends E> larger = list2;
+        if (list1.size() > list2.size()) {
+            smaller = list2;
+            larger = list1;
+        }
+
+        final HashSet<E> hashSet = new HashSet<E>(smaller);
+
+        for (final E e : larger) {
+            if (hashSet.contains(e)) {
+                result.add(e);
+                hashSet.remove(e);
+            }
+        }
+        return result;
+    }
+
+    /**
+     * Subtracts all elements in the second list from the first list,
+     * placing the results in a new list.
+     * <p>
+     * This differs from {@link List#removeAll(Collection)} in that
+     * cardinality is respected; if <Code>list1</Code> contains two
+     * occurrences of <Code>null</Code> and <Code>list2</Code> only
+     * contains one occurrence, then the returned list will still contain
+     * one occurrence.
+     *
+     * @param <E> the element type
+     * @param list1  the list to subtract from
+     * @param list2  the list to subtract
+     * @return a new list containing the results
+     * @throws NullPointerException if either list is null
+     */
+    public static <E> List<E> subtract(final List<E> list1, final List<? extends E> list2) {
+        final ArrayList<E> result = new ArrayList<E>();
+        final HashBag<E> bag = new HashBag<E>(list2);
+        for (final E e : list1) {
+            if (!bag.remove(e, 1)) {
+                result.add(e);
+            }
+        }
+        return result;
+    }
+
+    /**
+     * Returns the sum of the given lists.  This is their intersection
+     * subtracted from their union.
+     *
+     * @param <E> the element type
+     * @param list1  the first list
+     * @param list2  the second list
+     * @return  a new list containing the sum of those lists
+     * @throws NullPointerException if either list is null
+     */
+    public static <E> List<E> sum(final List<? extends E> list1, final List<? extends E> list2) {
+        return subtract(union(list1, list2), intersection(list1, list2));
+    }
+
+    /**
+     * Returns a new list containing the second list appended to the
+     * first list.  The {@link List#addAll(Collection)} operation is
+     * used to append the two given lists into a new list.
+     *
+     * @param <E> the element type
+     * @param list1  the first list
+     * @param list2  the second list
+     * @return a new list containing the union of those lists
+     * @throws NullPointerException if either list is null
+     */
+    public static <E> List<E> union(final List<? extends E> list1, final List<? extends E> list2) {
+        final ArrayList<E> result = new ArrayList<E>(list1);
+        result.addAll(list2);
+        return result;
+    }
+
+    /**
+     * Selects all elements from input collection which match the given
+     * predicate into an output list.
+     * <p>
+     * A <code>null</code> predicate matches no elements.
+     *
+     * @param <E> the element type
+     * @param inputCollection  the collection to get the input from, may not be null
+     * @param predicate  the predicate to use, may be null
+     * @return the elements matching the predicate (new list)
+     * @throws NullPointerException if the input list is null
+     *
+     * @since 4.0
+     * @see CollectionUtils#select(Iterable, Predicate)
+     */
+    public static <E> List<E> select(final Collection<? extends E> inputCollection,
+            final Predicate<? super E> predicate) {
+        return CollectionUtils.select(inputCollection, predicate, new ArrayList<E>(inputCollection.size()));
+    }
+
+    /**
+     * Selects all elements from inputCollection which don't match the given
+     * predicate into an output collection.
+     * <p>
+     * If the input predicate is <code>null</code>, the result is an empty list.
+     *
+     * @param <E> the element type
+     * @param inputCollection the collection to get the input from, may not be null
+     * @param predicate the predicate to use, may be null
+     * @return the elements <b>not</b> matching the predicate (new list)
+     * @throws NullPointerException if the input collection is null
+     *
+     * @since 4.0
+     * @see CollectionUtils#selectRejected(Iterable, Predicate)
+     */
+    public static <E> List<E> selectRejected(final Collection<? extends E> inputCollection,
+            final Predicate<? super E> predicate) {
+        return CollectionUtils.selectRejected(inputCollection, predicate, new ArrayList<E>(inputCollection.size()));
+    }
+
+    /**
+     * Tests two lists for value-equality as per the equality contract in
+     * {@link java.util.List#equals(java.lang.Object)}.
+     * <p>
+     * This method is useful for implementing <code>List</code> when you cannot
+     * extend AbstractList. The method takes Collection instances to enable other
+     * collection types to use the List implementation algorithm.
+     * <p>
+     * The relevant text (slightly paraphrased as this is a static method) is:
+     * <blockquote>
+     * Compares the two list objects for equality.  Returns
+     * {@code true} if and only if both
+     * lists have the same size, and all corresponding pairs of elements in
+     * the two lists are <i>equal</i>.  (Two elements {@code e1} and
+     * {@code e2} are <i>equal</i> if <tt>(e1==null ? e2==null :
+     * e1.equals(e2))</tt>.)  In other words, two lists are defined to be
+     * equal if they contain the same elements in the same order.  This
+     * definition ensures that the equals method works properly across
+     * different implementations of the {@code List} interface.
+     * </blockquote>
+     *
+     * <b>Note:</b> The behaviour of this method is undefined if the lists are
+     * modified during the equals comparison.
+     *
+     * @see java.util.List
+     * @param list1  the first list, may be null
+     * @param list2  the second list, may be null
+     * @return whether the lists are equal by value comparison
+     */
+    public static boolean isEqualList(final Collection<?> list1, final Collection<?> list2) {
+        if (list1 == list2) {
+            return true;
+        }
+        if (list1 == null || list2 == null || list1.size() != list2.size()) {
+            return false;
+        }
+
+        final Iterator<?> it1 = list1.iterator();
+        final Iterator<?> it2 = list2.iterator();
+        Object obj1 = null;
+        Object obj2 = null;
+
+        while (it1.hasNext() && it2.hasNext()) {
+            obj1 = it1.next();
+            obj2 = it2.next();
+
+            if (!(obj1 == null ? obj2 == null : obj1.equals(obj2))) {
+                return false;
+            }
+        }
+
+        return !(it1.hasNext() || it2.hasNext());
+    }
+
+    /**
+     * Generates a hash code using the algorithm specified in
+     * {@link java.util.List#hashCode()}.
+     * <p>
+     * This method is useful for implementing <code>List</code> when you cannot
+     * extend AbstractList. The method takes Collection instances to enable other
+     * collection types to use the List implementation algorithm.
+     *
+     * @see java.util.List#hashCode()
+     * @param list  the list to generate the hashCode for, may be null
+     * @return the hash code
+     */
+    public static int hashCodeForList(final Collection<?> list) {
+        if (list == null) {
+            return 0;
+        }
+        int hashCode = 1;
+        final Iterator<?> it = list.iterator();
+
+        while (it.hasNext()) {
+            final Object obj = it.next();
+            hashCode = 31 * hashCode + (obj == null ? 0 : obj.hashCode());
+        }
+        return hashCode;
+    }
+
+    //-----------------------------------------------------------------------
+    /**
+     * Returns a List containing all the elements in <code>collection</code>
+     * that are also in <code>retain</code>. The cardinality of an element <code>e</code>
+     * in the returned list is the same as the cardinality of <code>e</code>
+     * in <code>collection</code> unless <code>retain</code> does not contain <code>e</code>, in which
+     * case the cardinality is zero. This method is useful if you do not wish to modify
+     * the collection <code>c</code> and thus cannot call <code>collection.retainAll(retain);</code>.
+     * <p>
+     * This implementation iterates over <code>collection</code>, checking each element in
+     * turn to see if it's contained in <code>retain</code>. If it's contained, it's added
+     * to the returned list. As a consequence, it is advised to use a collection type for
+     * <code>retain</code> that provides a fast (e.g. O(1)) implementation of
+     * {@link Collection#contains(Object)}.
+     *
+     * @param <E>  the element type
+     * @param collection  the collection whose contents are the target of the #retailAll operation
+     * @param retain  the collection containing the elements to be retained in the returned collection
+     * @return a <code>List</code> containing all the elements of <code>c</code>
+     * that occur at least once in <code>retain</code>.
+     * @throws NullPointerException if either parameter is null
+     * @since 3.2
+     */
+    public static <E> List<E> retainAll(final Collection<E> collection, final Collection<?> retain) {
+        final List<E> list = new ArrayList<E>(Math.min(collection.size(), retain.size()));
+
+        for (final E obj : collection) {
+            if (retain.contains(obj)) {
+                list.add(obj);
+            }
+        }
+        return list;
+    }
+
+    /**
+     * Removes the elements in <code>remove</code> from <code>collection</code>. That is, this
+     * method returns a list containing all the elements in <code>collection</code>
+     * that are not in <code>remove</code>. The cardinality of an element <code>e</code>
+     * in the returned collection is the same as the cardinality of <code>e</code>
+     * in <code>collection</code> unless <code>remove</code> contains <code>e</code>, in which
+     * case the cardinality is zero. This method is useful if you do not wish to modify
+     * <code>collection</code> and thus cannot call <code>collection.removeAll(remove);</code>.
+     * <p>
+     * This implementation iterates over <code>collection</code>, checking each element in
+     * turn to see if it's contained in <code>remove</code>. If it's not contained, it's added
+     * to the returned list. As a consequence, it is advised to use a collection type for
+     * <code>remove</code> that provides a fast (e.g. O(1)) implementation of
+     * {@link Collection#contains(Object)}.
+     *
+     * @param <E>  the element type
+     * @param collection  the collection from which items are removed (in the returned collection)
+     * @param remove  the items to be removed from the returned <code>collection</code>
+     * @return a <code>List</code> containing all the elements of <code>c</code> except
+     * any elements that also occur in <code>remove</code>.
+     * @throws NullPointerException if either parameter is null
+     * @since 3.2
+     */
+    public static <E> List<E> removeAll(final Collection<E> collection, final Collection<?> remove) {
+        final List<E> list = new ArrayList<E>();
+        for (final E obj : collection) {
+            if (!remove.contains(obj)) {
+                list.add(obj);
+            }
+        }
+        return list;
+    }
+
+    //-----------------------------------------------------------------------
+    /**
+     * Returns a synchronized list backed by the given list.
+     * <p>
+     * You must manually synchronize on the returned list's iterator to
+     * avoid non-deterministic behavior:
+     *
+     * <pre>
+     * List list = ListUtils.synchronizedList(myList);
+     * synchronized (list) {
+     *     Iterator i = list.iterator();
+     *     while (i.hasNext()) {
+     *         process (i.next());
+     *     }
+     * }
+     * </pre>
+     *
+     * This method is just a wrapper for {@link Collections#synchronizedList(List)}.
+     *
+     * @param <E> the element type
+     * @param list  the list to synchronize, must not be null
+     * @return a synchronized list backed by the given list
+     * @throws NullPointerException if the list is null
+     */
+    public static <E> List<E> synchronizedList(final List<E> list) {
+        return Collections.synchronizedList(list);
+    }
+
+    /**
+     * Returns an unmodifiable list backed by the given list.
+     * <p>
+     * This method uses the implementation in the decorators subpackage.
+     *
+     * @param <E>  the element type
+     * @param list  the list to make unmodifiable, must not be null
+     * @return an unmodifiable list backed by the given list
+     * @throws NullPointerException if the list is null
+     */
+    public static <E> List<E> unmodifiableList(final List<? extends E> list) {
+        return UnmodifiableList.unmodifiableList(list);
+    }
+
+    /**
+     * Returns a predicated (validating) list backed by the given list.
+     * <p>
+     * Only objects that pass the test in the given predicate can be added to the list.
+     * Trying to add an invalid object results in an IllegalArgumentException.
+     * It is important not to use the original list after invoking this method,
+     * as it is a backdoor for adding invalid objects.
+     *
+     * @param <E> the element type
+     * @param list  the list to predicate, must not be null
+     * @param predicate  the predicate for the list, must not be null
+     * @return a predicated list backed by the given list
+     * @throws NullPointerException if the List or Predicate is null
+     */
+    public static <E> List<E> predicatedList(final List<E> list, final Predicate<E> predicate) {
+        return PredicatedList.predicatedList(list, predicate);
+    }
+
+    /**
+     * Returns a transformed list backed by the given list.
+     * <p>
+     * This method returns a new list (decorating the specified list) that
+     * will transform any new entries added to it.
+     * Existing entries in the specified list will not be transformed.
+     * <p>
+     * Each object is passed through the transformer as it is added to the
+     * List. It is important not to use the original list after invoking this
+     * method, as it is a backdoor for adding untransformed objects.
+     * <p>
+     * Existing entries in the specified list will not be transformed.
+     * If you want that behaviour, see {@link TransformedList#transformedList}.
+     *
+     * @param <E> the element type
+     * @param list  the list to predicate, must not be null
+     * @param transformer  the transformer for the list, must not be null
+     * @return a transformed list backed by the given list
+     * @throws NullPointerException if the List or Transformer is null
+     */
+    public static <E> List<E> transformedList(final List<E> list,
+                                              final Transformer<? super E, ? extends E> transformer) {
+        return TransformedList.transformingList(list, transformer);
+    }
+
+    /**
+     * Returns a "lazy" list whose elements will be created on demand.
+     * <p>
+     * When the index passed to the returned list's {@link List#get(int) get}
+     * method is greater than the list's size, then the factory will be used
+     * to create a new object and that object will be inserted at that index.
+     * <p>
+     * For instance:
+     *
+     * <pre>
+     * Factory&lt;Date&gt; factory = new Factory&lt;Date&gt;() {
+     *     public Date create() {
+     *         return new Date();
+     *     }
+     * }
+     * List&lt;Date&gt; lazy = ListUtils.lazyList(new ArrayList&lt;Date&gt;(), factory);
+     * Date date = lazy.get(3);
+     * </pre>
+     *
+     * After the above code is executed, <code>date</code> will refer to
+     * a new <code>Date</code> instance.  Furthermore, that <code>Date</code>
+     * instance is the fourth element in the list.  The first, second,
+     * and third element are all set to <code>null</code>.
+     *
+     * @param <E> the element type
+     * @param list  the list to make lazy, must not be null
+     * @param factory  the factory for creating new objects, must not be null
+     * @return a lazy list backed by the given list
+     * @throws NullPointerException if the List or Factory is null
+     */
+    public static <E> List<E> lazyList(final List<E> list, final Factory<? extends E> factory) {
+        return LazyList.lazyList(list, factory);
+    }
+
+    /**
+     * Returns a fixed-sized list backed by the given list.
+     * Elements may not be added or removed from the returned list, but
+     * existing elements can be changed (for instance, via the
+     * {@link List#set(int, Object)} method).
+     *
+     * @param <E>  the element type
+     * @param list  the list whose size to fix, must not be null
+     * @return a fixed-size list backed by that list
+     * @throws NullPointerException  if the List is null
+     */
+    public static <E> List<E> fixedSizeList(final List<E> list) {
+        return FixedSizeList.fixedSizeList(list);
+    }
+
+    //-----------------------------------------------------------------------
+    /**
+     * Finds the first index in the given List which matches the given predicate.
+     * <p>
+     * If the input List or predicate is null, or no element of the List
+     * matches the predicate, -1 is returned.
+     *
+     * @param <E>  the element type
+     * @param list the List to search, may be null
+     * @param predicate  the predicate to use, may be null
+     * @return the first index of an Object in the List which matches the predicate or -1 if none could be found
+     */
+    public static <E> int indexOf(final List<E> list, final Predicate<E> predicate) {
+        if (list != null && predicate != null) {
+            for (int i = 0; i < list.size(); i++) {
+                final E item = list.get(i);
+                if (predicate.evaluate(item)) {
+                    return i;
+                }
+            }
+        }
+        return -1;
+    }
+
+    //-----------------------------------------------------------------------
+    /**
+     * Returns the longest common subsequence (LCS) of two sequences (lists).
+     *
+     * @param <E>  the element type
+     * @param a  the first list
+     * @param b  the second list
+     * @return the longest common subsequence
+     * @throws NullPointerException if either list is {@code null}
+     * @since 4.0
+     */
+    public static <E> List<E> longestCommonSubsequence(final List<E> a, final List<E> b) {
+      return longestCommonSubsequence( a, b, DefaultEquator.defaultEquator() );
+    }
+
+    /**
+     * Returns the longest common subsequence (LCS) of two sequences (lists).
+     *
+     * @param <E>  the element type
+     * @param a  the first list
+     * @param b  the second list
+     * @param equator  the equator used to test object equality
+     * @return the longest common subsequence
+     * @throws NullPointerException if either list or the equator is {@code null}
+     * @since 4.0
+     */
+    public static <E> List<E> longestCommonSubsequence(final List<E> a, final List<E> b,
+                                                       final Equator<? super E> equator) {
+        if (a == null || b == null) {
+            throw new NullPointerException("List must not be null");
+        }
+        if (equator == null) {
+          throw new NullPointerException("Equator must not be null");
+        }
+
+        final SequencesComparator<E> comparator = new SequencesComparator<E>(a, b, equator);
+        final EditScript<E> script = comparator.getScript();
+        final LcsVisitor<E> visitor = new LcsVisitor<E>();
+        script.visit(visitor);
+        return visitor.getSubSequence();
+    }
+
+    /**
+     * Returns the longest common subsequence (LCS) of two {@link CharSequence} objects.
+     * <p>
+     * This is a convenience method for using {@link #longestCommonSubsequence(List, List)}
+     * with {@link CharSequence} instances.
+     *
+     * @param a  the first sequence
+     * @param b  the second sequence
+     * @return the longest common subsequence as {@link String}
+     * @throws NullPointerException if either sequence is {@code null}
+     * @since 4.0
+     */
+    public static String longestCommonSubsequence(final CharSequence a, final CharSequence b) {
+        if (a == null || b == null) {
+            throw new NullPointerException("CharSequence must not be null");
+        }
+        final List<Character> lcs = longestCommonSubsequence(new CharSequenceAsList( a ), new CharSequenceAsList( b ));
+        final StringBuilder sb = new StringBuilder();
+        for ( Character ch : lcs ) {
+          sb.append(ch);
+        }
+        return sb.toString();
+    }
+
+    /**
+     * A helper class used to construct the longest common subsequence.
+     */
+    private static final class LcsVisitor<E> implements CommandVisitor<E> {
+        private ArrayList<E> sequence;
+
+        public LcsVisitor() {
+            sequence = new ArrayList<E>();
+        }
+
+        public void visitInsertCommand(final E object) {}
+
+        public void visitDeleteCommand(final E object) {}
+
+        public void visitKeepCommand(final E object) {
+            sequence.add(object);
+        }
+
+        public List<E> getSubSequence() {
+            return sequence;
+        }
+    }
+
+    /**
+     * A simple wrapper to use a CharSequence as List.
+     */
+    private static final class CharSequenceAsList extends AbstractList<Character> {
+
+      private final CharSequence sequence;
+
+      public CharSequenceAsList(final CharSequence sequence) {
+        this.sequence = sequence;
+      }
+
+      @Override
+      public Character get( int index ) {
+        return Character.valueOf(sequence.charAt( index ));
+      }
+
+      @Override
+      public int size() {
+        return sequence.length();
+      }
+
+    }
+
+    //-----------------------------------------------------------------------
+    /**
+     * Returns consecutive {@link List#subList(int, int) sublists} of a
+     * list, each of the same size (the final list may be smaller). For example,
+     * partitioning a list containing {@code [a, b, c, d, e]} with a partition
+     * size of 3 yields {@code [[a, b, c], [d, e]]} -- an outer list containing
+     * two inner lists of three and two elements, all in the original order.
+     * <p>
+     * The outer list is unmodifiable, but reflects the latest state of the
+     * source list. The inner lists are sublist views of the original list,
+     * produced on demand using {@link List#subList(int, int)}, and are subject
+     * to all the usual caveats about modification as explained in that API.
+     * <p>
+     * Adapted from http://code.google.com/p/guava-libraries/
+     *
+     * @param <T> the element type
+     * @param list  the list to return consecutive sublists of
+     * @param size  the desired size of each sublist (the last may be smaller)
+     * @return a list of consecutive sublists
+     * @throws NullPointerException if list is null
+     * @throws IllegalArgumentException if size is not strictly positive
+     * @since 4.0
+     */
+    public static <T> List<List<T>> partition(final List<T> list, final int size) {
+        if (list == null) {
+            throw new NullPointerException("List must not be null");
+        }
+        if (size <= 0) {
+            throw new IllegalArgumentException("Size must be greater than 0");
+        }
+        return new Partition<T>(list, size);
+    }
+
+    /**
+     * Provides a partition view on a {@link List}.
+     * @since 4.0
+     */
+    private static class Partition<T> extends AbstractList<List<T>> {
+        private final List<T> list;
+        private final int size;
+
+        private Partition(final List<T> list, final int size) {
+            this.list = list;
+            this.size = size;
+        }
+
+        @Override
+        public List<T> get(final int index) {
+            final int listSize = size();
+            if (listSize < 0) {
+                throw new IllegalArgumentException("negative size: " + listSize);
+            }
+            if (index < 0) {
+                throw new IndexOutOfBoundsException("Index " + index + " must not be negative");
+            }
+            if (index >= listSize) {
+                throw new IndexOutOfBoundsException("Index " + index + " must be less than size " +
+                                                    listSize);
+            }
+            final int start = index * size;
+            final int end = Math.min(start + size, list.size());
+            return list.subList(start, end);
+        }
+
+        @Override
+        public int size() {
+            return (list.size() + size - 1) / size;
+        }
+
+        @Override
+        public boolean isEmpty() {
+            return list.isEmpty();
+        }
+    }
+}

fine-commons-collections4/src/com/fr/third/org/apache/commons/collections4/ListValuedMap.java

@@ -0,0 +1,67 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.fr.third.org.apache.commons.collections4;
+
+import java.util.List;
+
+/**
+ * Defines a map that holds a list of values against each key.
+ * <p>
+ * A {@code ListValuedMap} is a Map with slightly different semantics:
+ * <ul>
+ *   <li>Putting a value into the map will add the value to a {@link List} at that key.</li>
+ *   <li>Getting a value will return a {@link List}, holding all the values put to that key.</li>
+ * </ul>
+ *
+ * @since 4.1
+ * @version $Id: ListValuedMap.java 1685299 2015-06-13 18:27:11Z tn $
+ */
+public interface ListValuedMap<K, V> extends MultiValuedMap<K, V> {
+
+    /**
+     * Gets the list of values associated with the specified key.
+     * <p>
+     * This method will return an <b>empty</b> list if
+     * {@link #containsKey(Object)} returns {@code false}. Changes to the
+     * returned list will update the underlying {@code ListValuedMap} and
+     * vice-versa.
+     *
+     * @param key  the key to retrieve
+     * @return the {@code List} of values, implementations should return an
+     *   empty {@code List} for no mapping
+     * @throws NullPointerException if the key is null and null keys are invalid
+     */
+    @Override
+    List<V> get(K key);
+
+    /**
+     * Removes all values associated with the specified key.
+     * <p>
+     * The returned list <i>may</i> be modifiable, but updates will not be
+     * propagated to this list-valued map. In case no mapping was stored for the
+     * specified key, an empty, unmodifiable list will be returned.
+     *
+     * @param key  the key to remove values from
+     * @return the {@code List} of values removed, implementations
+     *   typically return an empty, unmodifiable {@code List} for no mapping found
+     * @throws UnsupportedOperationException if the map is unmodifiable
+     * @throws NullPointerException if the key is null and null keys are invalid
+     */
+    @Override
+    List<V> remove(Object key);
+
+}

fine-commons-collections4/src/com/fr/third/org/apache/commons/collections4/MapIterator.java

@@ -0,0 +1,109 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.fr.third.org.apache.commons.collections4;
+
+import java.util.Iterator;
+
+/**
+ * Defines an iterator that operates over a <code>Map</code>.
+ * <p>
+ * This iterator is a special version designed for maps. It can be more
+ * efficient to use this rather than an entry set iterator where the option
+ * is available, and it is certainly more convenient.
+ * <p>
+ * A map that provides this interface may not hold the data internally using
+ * Map Entry objects, thus this interface can avoid lots of object creation.
+ * <p>
+ * In use, this iterator iterates through the keys in the map. After each call
+ * to <code>next()</code>, the <code>getValue()</code> method provides direct
+ * access to the value. The value can also be set using <code>setValue()</code>.
+ * <pre>
+ * MapIterator<String,Integer> it = map.mapIterator();
+ * while (it.hasNext()) {
+ *   String key = it.next();
+ *   Integer value = it.getValue();
+ *   it.setValue(value + 1);
+ * }
+ * </pre>
+ *
+ * @param <K> the type of the keys in the map
+ * @param <V> the type of the values in the map
+ * @since 3.0
+ * @version $Id: MapIterator.java 1469004 2013-04-17 17:37:03Z tn $
+ */
+public interface MapIterator<K, V> extends Iterator<K> {
+
+    /**
+     * Checks to see if there are more entries still to be iterated.
+     *
+     * @return <code>true</code> if the iterator has more elements
+     */
+    boolean hasNext();
+
+    /**
+     * Gets the next <em>key</em> from the <code>Map</code>.
+     *
+     * @return the next key in the iteration
+     * @throws java.util.NoSuchElementException if the iteration is finished
+     */
+    K next();
+
+    //-----------------------------------------------------------------------
+    /**
+     * Gets the current key, which is the key returned by the last call
+     * to <code>next()</code>.
+     *
+     * @return the current key
+     * @throws IllegalStateException if <code>next()</code> has not yet been called
+     */
+    K getKey();
+
+    /**
+     * Gets the current value, which is the value associated with the last key
+     * returned by <code>next()</code>.
+     *
+     * @return the current value
+     * @throws IllegalStateException if <code>next()</code> has not yet been called
+     */
+    V getValue();
+
+    //-----------------------------------------------------------------------
+    /**
+     * Removes the last returned key from the underlying <code>Map</code> (optional operation).
+     * <p>
+     * This method can be called once per call to <code>next()</code>.
+     *
+     * @throws UnsupportedOperationException if remove is not supported by the map
+     * @throws IllegalStateException if <code>next()</code> has not yet been called
+     * @throws IllegalStateException if <code>remove()</code> has already been called
+     *  since the last call to <code>next()</code>
+     */
+    void remove();
+
+    /**
+     * Sets the value associated with the current key (optional operation).
+     *
+     * @param value  the new value
+     * @return the previous value
+     * @throws UnsupportedOperationException if setValue is not supported by the map
+     * @throws IllegalStateException if <code>next()</code> has not yet been called
+     * @throws IllegalStateException if <code>remove()</code> has been called since the
+     *  last call to <code>next()</code>
+     */
+    V setValue(V value);
+
+}

fine-commons-collections4/src/com/fr/third/org/apache/commons/collections4/MultiMap.java

@@ -0,0 +1,158 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.fr.third.org.apache.commons.collections4;
+
+import java.util.Collection;
+
+/**
+ * Defines a map that holds a collection of values against each key.
+ * <p>
+ * A <code>MultiMap</code> is a Map with slightly different semantics.
+ * Putting a value into the map will add the value to a Collection at that key.
+ * Getting a value will return a Collection, holding all the values put to that key.
+ * <p>
+ * For example:
+ * <pre>
+ * MultiMap mhm = new MultiValueMap();
+ * mhm.put(key, "A");
+ * mhm.put(key, "B");
+ * mhm.put(key, "C");
+ * Collection coll = (Collection) mhm.get(key);</pre>
+ * <p>
+ * <code>coll</code> will be a collection containing "A", "B", "C".
+ * <p>
+ * NOTE: Additional methods were added to this interface in Commons Collections 3.1.
+ * These were added solely for documentation purposes and do not change the interface
+ * as they were defined in the superinterface <code>Map</code> anyway.
+ *
+ * @since 2.0
+ * @version $Id: MultiMap.java 1683018 2015-06-01 22:41:31Z tn $
+ * @deprecated since 4.1, use {@link MultiValuedMap} instead
+ */
+@Deprecated
+public interface MultiMap<K, V> extends IterableMap<K, Object> {
+
+    /**
+     * Removes a specific value from map.
+     * <p>
+     * The item is removed from the collection mapped to the specified key.
+     * Other values attached to that key are unaffected.
+     * <p>
+     * If the last value for a key is removed, implementations typically
+     * return <code>null</code> from a subsequent <code>get(Object)</code>, however
+     * they may choose to return an empty collection.
+     *
+     * @param key  the key to remove from
+     * @param item  the item to remove
+     * @return {@code true} if the mapping was removed, {@code false} otherwise
+     * @throws UnsupportedOperationException if the map is unmodifiable
+     * @throws ClassCastException if the key or value is of an invalid type
+     * @throws NullPointerException if the key or value is null and null is invalid
+     * @since 4.0 (signature in previous releases: V remove(K, V))
+     */
+    boolean removeMapping(K key, V item);
+
+    //-----------------------------------------------------------------------
+    /**
+     * Gets the number of keys in this map.
+     * <p>
+     * Implementations typically return only the count of keys in the map
+     * This cannot be mandated due to backwards compatibility of this interface.
+     *
+     * @return the number of key-collection mappings in this map
+     */
+    int size();
+
+    /**
+     * Gets the collection of values associated with the specified key.
+     * <p>
+     * The returned value will implement <code>Collection</code>. Implementations
+     * are free to declare that they return <code>Collection</code> subclasses
+     * such as <code>List</code> or <code>Set</code>.
+     * <p>
+     * Implementations typically return <code>null</code> if no values have
+     * been mapped to the key, however the implementation may choose to
+     * return an empty collection.
+     * <p>
+     * Implementations may choose to return a clone of the internal collection.
+     *
+     * @param key  the key to retrieve
+     * @return the <code>Collection</code> of values, implementations should
+     *  return <code>null</code> for no mapping, but may return an empty collection
+     * @throws ClassCastException if the key is of an invalid type
+     * @throws NullPointerException if the key is null and null keys are invalid
+     */
+    Object get(Object key); // Cannot use get(K key) as that does not properly implement Map#get
+
+    /**
+     * Checks whether the map contains the value specified.
+     * <p>
+     * Implementations typically check all collections against all keys for the value.
+     * This cannot be mandated due to backwards compatibility of this interface.
+     *
+     * @param value  the value to search for
+     * @return true if the map contains the value
+     * @throws ClassCastException if the value is of an invalid type
+     * @throws NullPointerException if the value is null and null value are invalid
+     */
+    boolean containsValue(Object value);
+
+    /**
+     * Adds the value to the collection associated with the specified key.
+     * <p>
+     * Unlike a normal <code>Map</code> the previous value is not replaced.
+     * Instead the new value is added to the collection stored against the key.
+     * The collection may be a <code>List</code>, <code>Set</code> or other
+     * collection dependent on implementation.
+     *
+     * @param key  the key to store against
+     * @param value  the value to add to the collection at the key
+     * @return typically the value added if the map changed and null if the map did not change
+     * @throws UnsupportedOperationException if the map is unmodifiable
+     * @throws ClassCastException if the key or value is of an invalid type
+     * @throws NullPointerException if the key or value is null and null is invalid
+     * @throws IllegalArgumentException if the key or value is invalid
+     */
+    Object put(K key, Object value);
+
+    /**
+     * Removes all values associated with the specified key.
+     * <p>
+     * Implementations typically return <code>null</code> from a subsequent
+     * <code>get(Object)</code>, however they may choose to return an empty collection.
+     *
+     * @param key  the key to remove values from
+     * @return the <code>Collection</code> of values removed, implementations should
+     *  return <code>null</code> for no mapping found, but may return an empty collection
+     * @throws UnsupportedOperationException if the map is unmodifiable
+     * @throws ClassCastException if the key is of an invalid type
+     * @throws NullPointerException if the key is null and null keys are invalid
+     */
+    Object remove(Object key); // Cannot use remove(K key) as that does not properly implement Map#remove
+
+    /**
+     * Gets a collection containing all the values in the map.
+     * <p>
+     * Implementations typically return a collection containing the combination
+     * of values from all keys.
+     * This cannot be mandated due to backwards compatibility of this interface.
+     *
+     * @return a collection view of the values contained in this map
+     */
+    Collection<Object> values();
+
+}

fine-commons-collections4/src/com/fr/third/org/apache/commons/collections4/MultiMapUtils.java

@@ -0,0 +1,259 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.fr.third.org.apache.commons.collections4;
+
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Set;
+
+import com.fr.third.org.apache.commons.collections4.bag.HashBag;
+import com.fr.third.org.apache.commons.collections4.multimap.ArrayListValuedHashMap;
+import com.fr.third.org.apache.commons.collections4.multimap.HashSetValuedHashMap;
+import com.fr.third.org.apache.commons.collections4.multimap.TransformedMultiValuedMap;
+import com.fr.third.org.apache.commons.collections4.multimap.UnmodifiableMultiValuedMap;
+import com.fr.third.org.apache.commons.collections4.bag.HashBag;
+import com.fr.third.org.apache.commons.collections4.multimap.ArrayListValuedHashMap;
+import com.fr.third.org.apache.commons.collections4.multimap.HashSetValuedHashMap;
+import com.fr.third.org.apache.commons.collections4.multimap.TransformedMultiValuedMap;
+import com.fr.third.org.apache.commons.collections4.multimap.UnmodifiableMultiValuedMap;
+
+/**
+ * Provides utility methods and decorators for {@link MultiValuedMap} instances.
+ * <p>
+ * It contains various type safe and null safe methods. Additionally, it provides
+ * the following decorators:
+ * <ul>
+ *   <li>{@link #unmodifiableMultiValuedMap(MultiValuedMap)}</li>
+ *   <li>{@link #transformedMultiValuedMap(MultiValuedMap, Transformer, Transformer)}</li>
+ * </ul>
+ *
+ * @since 4.1
+ * @version $Id: MultiMapUtils.java 1715302 2015-11-19 23:08:01Z tn $
+ */
+public class MultiMapUtils {
+
+    /**
+     * <code>MultiMapUtils</code> should not normally be instantiated.
+     */
+    private MultiMapUtils() {}
+
+    /**
+     * An empty {@link UnmodifiableMultiValuedMap}.
+     */
+    @SuppressWarnings({ "rawtypes", "unchecked" })
+    public static final MultiValuedMap EMPTY_MULTI_VALUED_MAP =
+            UnmodifiableMultiValuedMap.unmodifiableMultiValuedMap(new ArrayListValuedHashMap(0, 0));
+
+    /**
+     * Returns immutable EMPTY_MULTI_VALUED_MAP with generic type safety.
+     *
+     * @param <K> the type of key in the map
+     * @param <V> the type of value in the map
+     * @return immutable and empty <code>MultiValuedMap</code>
+     */
+    @SuppressWarnings("unchecked")
+    public static <K, V> MultiValuedMap<K, V> emptyMultiValuedMap() {
+        return EMPTY_MULTI_VALUED_MAP;
+    }
+
+    // Null safe methods
+
+    /**
+     * Returns an immutable empty <code>MultiValuedMap</code> if the argument is
+     * <code>null</code>, or the argument itself otherwise.
+     *
+     * @param <K> the type of key in the map
+     * @param <V> the type of value in the map
+     * @param map  the map, may be null
+     * @return an empty {@link MultiValuedMap} if the argument is null
+     */
+    @SuppressWarnings("unchecked")
+    public static <K, V> MultiValuedMap<K, V> emptyIfNull(final MultiValuedMap<K, V> map) {
+        return map == null ? EMPTY_MULTI_VALUED_MAP : map;
+    }
+
+    /**
+     * Null-safe check if the specified <code>MultiValuedMap</code> is empty.
+     * <p>
+     * If the provided map is null, returns true.
+     *
+     * @param map  the map to check, may be null
+     * @return true if the map is empty or null
+     */
+    public static boolean isEmpty(final MultiValuedMap<?, ?> map) {
+        return map == null || map.isEmpty();
+    }
+
+    // Null safe getters
+    // -------------------------------------------------------------------------
+
+    /**
+     * Gets a Collection from <code>MultiValuedMap</code> in a null-safe manner.
+     *
+     * @param <K> the key type
+     * @param <V> the value type
+     * @param map  the {@link MultiValuedMap} to use
+     * @param key  the key to look up
+     * @return the Collection in the {@link MultiValuedMap}, or null if input map is null
+     */
+    public static <K, V> Collection<V> getCollection(final MultiValuedMap<K, V> map, final K key) {
+        if (map != null) {
+            return map.get(key);
+        }
+        return null;
+    }
+
+    // TODO: review the getValuesAsXXX methods - depending on the actual MultiValuedMap type, changes
+    // to the returned collection might update the backing map. This should be clarified and/or prevented.
+
+    /**
+     * Gets a List from <code>MultiValuedMap</code> in a null-safe manner.
+     *
+     * @param <K> the key type
+     * @param <V> the value type
+     * @param map  the {@link MultiValuedMap} to use
+     * @param key  the key to look up
+     * @return the Collection in the {@link MultiValuedMap} as List, or null if input map is null
+     */
+    public static <K, V> List<V> getValuesAsList(final MultiValuedMap<K, V> map, final K key) {
+        if (map != null) {
+            Collection<V> col = map.get(key);
+            if (col instanceof List) {
+                return (List<V>) col;
+            }
+            return new ArrayList<V>(col);
+        }
+        return null;
+    }
+
+    /**
+     * Gets a Set from <code>MultiValuedMap</code> in a null-safe manner.
+     *
+     * @param <K> the key type
+     * @param <V> the value type
+     * @param map  the {@link MultiValuedMap} to use
+     * @param key  the key to look up
+     * @return the Collection in the {@link MultiValuedMap} as Set, or null if input map is null
+     */
+    public static <K, V> Set<V> getValuesAsSet(final MultiValuedMap<K, V> map, final K key) {
+        if (map != null) {
+            Collection<V> col = map.get(key);
+            if (col instanceof Set) {
+                return (Set<V>) col;
+            }
+            return new HashSet<V>(col);
+        }
+        return null;
+    }
+
+    /**
+     * Gets a Bag from <code>MultiValuedMap</code> in a null-safe manner.
+     *
+     * @param <K> the key type
+     * @param <V> the value type
+     * @param map  the {@link MultiValuedMap} to use
+     * @param key  the key to look up
+     * @return the Collection in the {@link MultiValuedMap} as Bag, or null if input map is null
+     */
+    public static <K, V> Bag<V> getValuesAsBag(final MultiValuedMap<K, V> map, final K key) {
+        if (map != null) {
+            Collection<V> col = map.get(key);
+            if (col instanceof Bag) {
+                return (Bag<V>) col;
+            }
+            return new HashBag<V>(col);
+        }
+        return null;
+    }
+
+    // Factory Methods
+    // -----------------------------------------------------------------------
+
+    /**
+     * Creates a {@link ListValuedMap} with an {@link java.util.ArrayList ArrayList} as
+     * collection class to store the values mapped to a key.
+     *
+     * @param <K> the key type
+     * @param <V> the value type
+     * @return a new <code>ListValuedMap</code>
+     */
+    public static <K, V> ListValuedMap<K, V> newListValuedHashMap() {
+        return new ArrayListValuedHashMap<K, V>();
+    }
+
+    /**
+     * Creates a {@link SetValuedMap} with an {@link java.util.HashSet HashSet} as
+     * collection class to store the values mapped to a key.
+     *
+     * @param <K> the key type
+     * @param <V> the value type
+     * @return a new {@link SetValuedMap}
+     */
+    public static <K, V> SetValuedMap<K, V> newSetValuedHashMap() {
+        return new HashSetValuedHashMap<K, V>();
+    }
+
+    // MultiValuedMap Decorators
+    // -----------------------------------------------------------------------
+
+    /**
+     * Returns an <code>UnmodifiableMultiValuedMap</code> backed by the given
+     * map.
+     *
+     * @param <K> the key type
+     * @param <V> the value type
+     * @param map  the {@link MultiValuedMap} to decorate, must not be null
+     * @return an unmodifiable {@link MultiValuedMap} backed by the provided map
+     * @throws NullPointerException if map is null
+     */
+    public static <K, V> MultiValuedMap<K, V> unmodifiableMultiValuedMap(
+            final MultiValuedMap<? extends K, ? extends V> map) {
+        return UnmodifiableMultiValuedMap.<K, V>unmodifiableMultiValuedMap(map);
+    }
+
+    /**
+     * Returns a <code>TransformedMultiValuedMap</code> backed by the given map.
+     * <p>
+     * This method returns a new <code>MultiValuedMap</code> (decorating the
+     * specified map) that will transform any new entries added to it. Existing
+     * entries in the specified map will not be transformed. If you want that
+     * behaviour, see {@link TransformedMultiValuedMap#transformedMap}.
+     * <p>
+     * Each object is passed through the transformers as it is added to the Map.
+     * It is important not to use the original map after invoking this method,
+     * as it is a back door for adding untransformed objects.
+     * <p>
+     * If there are any elements already in the map being decorated, they are
+     * NOT transformed.
+     *
+     * @param <K> the key type
+     * @param <V> the value type
+     * @param map  the {@link MultiValuedMap} to transform, must not be null, typically empty
+     * @param keyTransformer  the transformer for the map keys, null means no transformation
+     * @param valueTransformer  the transformer for the map values, null means no transformation
+     * @return a transformed <code>MultiValuedMap</code> backed by the given map
+     * @throws NullPointerException if map is null
+     */
+    public static <K, V> MultiValuedMap<K, V> transformedMultiValuedMap(final MultiValuedMap<K, V> map,
+            final Transformer<? super K, ? extends K> keyTransformer,
+            final Transformer<? super V, ? extends V> valueTransformer) {
+        return TransformedMultiValuedMap.transformingMap(map, keyTransformer, valueTransformer);
+    }
+
+}

fine-commons-collections4/src/com/fr/third/org/apache/commons/collections4/MultiSet.java

@@ -0,0 +1,272 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.fr.third.org.apache.commons.collections4;
+
+import java.util.Collection;
+import java.util.Iterator;
+import java.util.Set;
+
+/**
+ * Defines a collection that counts the number of times an object appears in
+ * the collection.
+ * <p>
+ * Suppose you have a MultiSet that contains <code>{a, a, b, c}</code>.
+ * Calling {@link #getCount(Object)} on <code>a</code> would return 2, while
+ * calling {@link #uniqueSet()} would return <code>{a, b, c}</code>.
+ *
+ * @param <E> the type held in the multiset
+ * @since 4.1
+ * @version $Id: MultiSet.java 1714424 2015-11-15 10:06:16Z tn $
+ */
+public interface MultiSet<E> extends Collection<E> {
+
+    /**
+     * Returns the number of occurrences of the given object currently
+     * in the MultiSet. If the object does not exist in the multiset,
+     * return 0.
+     *
+     * @param object  the object to search for
+     * @return the number of occurrences of the object, zero if not found
+     */
+    int getCount(Object object);
+
+    /**
+     * Sets the number of occurrences of the specified object in the MultiSet
+     * to the given count.
+     * <p>
+     * If the provided count is zero, the object will be removed from the
+     * {@link #uniqueSet()}.
+     *
+     * @param object  the object to update
+     * @param count  the number of occurrences of the object
+     * @return the number of occurrences of the object before this operation, zero
+     *   if the object was not contained in the multiset
+     * @throws IllegalArgumentException if count is negative
+     */
+    int setCount(E object, int count);
+
+    /**
+     * Adds one copy of the specified object to the MultiSet.
+     * <p>
+     * If the object is already in the {@link #uniqueSet()} then increment its
+     * count as reported by {@link #getCount(Object)}. Otherwise add it to the
+     * {@link #uniqueSet()} and report its count as 1.
+     *
+     * @param object  the object to add
+     * @return <code>true</code> always, as the size of the MultiSet is increased
+     *   in any case
+     */
+    @Override
+    boolean add(E object);
+
+    /**
+     * Adds a number of occurrences of the specified object to the MultiSet.
+     * <p>
+     * If the object is already in the {@link #uniqueSet()} then increment its
+     * count as reported by {@link #getCount(Object)}. Otherwise add it to the
+     * {@link #uniqueSet()} and report its count as <code>occurrences</code>.
+     *
+     * @param object  the object to add
+     * @param occurrences  the number of occurrences to add, may be zero,
+     *   in which case no change is made to the multiset
+     * @return the number of occurrences of the object in the multiset before
+     *   this operation; possibly zero
+     * @throws IllegalArgumentException if occurrences is negative
+     */
+    int add(E object, int occurrences);
+
+    /**
+     * Removes one occurrence of the given object from the MultiSet.
+     * <p>
+     * If the number of occurrences after this operations is reduced
+     * to zero, the object will be removed from the {@link #uniqueSet()}.
+     *
+     * @param object  the object to remove
+     * @return <code>true</code> if this call changed the collection
+     */
+    @Override
+    boolean remove(Object object);
+
+    /**
+     * Removes a number of occurrences of the specified object from the MultiSet.
+     * <p>
+     * If the number of occurrences to remove is greater than the actual number of
+     * occurrences in the multiset, the object will be removed from the multiset.
+     *
+     * @param object  the object to remove
+     * @param occurrences  the number of occurrences to remove, may be zero,
+     *   in which case no change is made to the multiset
+     * @return the number of occurrences of the object in the multiset
+     *   before the operation; possibly zero
+     * @throws IllegalArgumentException if occurrences is negative
+     */
+    int remove(Object object, int occurrences);
+
+    /**
+     * Returns a {@link Set} of unique elements in the MultiSet.
+     * <p>
+     * Uniqueness constraints are the same as those in {@link java.util.Set}.
+     * <p>
+     * The returned set is backed by this multiset, so any change to either
+     * is immediately reflected in the other. Only removal operations are
+     * supported, in which case all occurrences of the element are removed
+     * from the backing multiset.
+     *
+     * @return the Set of unique MultiSet elements
+     */
+    Set<E> uniqueSet();
+
+    /**
+     * Returns a {@link Set} of all entries contained in the MultiSet.
+     * <p>
+     * The returned set is backed by this multiset, so any change to either
+     * is immediately reflected in the other.
+     *
+     * @return the Set of MultiSet entries
+     */
+    Set<Entry<E>> entrySet();
+
+    /**
+     * Returns an {@link Iterator} over the entire set of members,
+     * including copies due to cardinality. This iterator is fail-fast
+     * and will not tolerate concurrent modifications.
+     *
+     * @return iterator over all elements in the MultiSet
+     */
+    @Override
+    Iterator<E> iterator();
+
+    /**
+     * Returns the total number of items in the MultiSet.
+     *
+     * @return the total size of the multiset
+     */
+    @Override
+    int size();
+
+    /**
+     * Returns <code>true</code> if the MultiSet contains at least one
+     * occurrence for each element contained in the given collection.
+     *
+     * @param coll  the collection to check against
+     * @return <code>true</code> if the MultiSet contains all the collection
+     */
+    @Override
+    boolean containsAll(Collection<?> coll);
+
+    /**
+     * Remove all occurrences of all elements from this MultiSet represented
+     * in the given collection.
+     *
+     * @param coll  the collection of elements to remove
+     * @return <code>true</code> if this call changed the multiset
+     */
+    @Override
+    boolean removeAll(Collection<?> coll);
+
+    /**
+     * Remove any elements of this MultiSet that are not contained in the
+     * given collection.
+     *
+     * @param coll  the collection of elements to retain
+     * @return <code>true</code> if this call changed the multiset
+     */
+    @Override
+    boolean retainAll(Collection<?> coll);
+
+    /**
+     * Compares this MultiSet to another object.
+     * <p>
+     * This MultiSet equals another object if it is also a MultiSet
+     * that contains the same number of occurrences of the same elements.
+     *
+     * @param obj  the object to compare to
+     * @return true if equal
+     */
+    @Override
+    boolean equals(Object obj);
+
+    /**
+     * Gets a hash code for the MultiSet compatible with the definition of equals.
+     * The hash code is defined as the sum total of a hash code for each element.
+     * The per element hash code is defined as
+     * <code>(e==null ? 0 : e.hashCode()) ^ noOccurances)</code>.
+     *
+     * @return the hash code of the MultiSet
+     */
+    @Override
+    int hashCode();
+
+    /**
+     * An unmodifiable entry for an element and its occurrence as contained in a MultiSet.
+     * <p>
+     * The {@link MultiSet#entrySet()} method returns a view of the multiset whose elements
+     * implements this interface.
+     *
+     * @param <E>  the element type
+     */
+    interface Entry<E> {
+
+        /**
+         * Returns the element corresponding to this entry.
+         *
+         * @return the element corresponding to this entry
+         */
+        E getElement();
+
+        /**
+         * Returns the number of occurrences for the element of this entry.
+         *
+         * @return the number of occurrences of the element
+         */
+        int getCount();
+
+        /**
+         * Compares the specified object with this entry for equality.
+         * Returns true if the given object is also a multiset entry
+         * and the two entries represent the same element with the same
+         * number of occurrences.
+         * <p>
+         * More formally, two entries <tt>e1</tt> and <tt>e2</tt> represent
+         * the same mapping if
+         * <pre>
+         *     (e1.getElement()==null ? e2.getElement()==null
+         *                            : e1.getElement().equals(e2.getElement())) &amp;&amp;
+         *     (e1.getCount()==e2.getCount())
+         * </pre>
+         *
+         * @param o object to be compared for equality with this multiset entry
+         * @return true if the specified object is equal to this multiset entry
+         */
+        @Override
+        boolean equals(Object o);
+
+        /**
+         * Returns the hash code value for this multiset entry.
+         * <p>
+         * The hash code of a multiset entry <tt>e</tt> is defined to be:
+         * <pre>
+         *      (e==null ? 0 : e.hashCode()) ^ noOccurances)
+         * </pre>
+         *
+         * @return the hash code value for this multiset entry
+         */
+        @Override
+        int hashCode();
+    }
+
+}

fine-commons-collections4/src/com/fr/third/org/apache/commons/collections4/MultiSetUtils.java

@@ -0,0 +1,123 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.fr.third.org.apache.commons.collections4;
+
+import com.fr.third.org.apache.commons.collections4.multiset.HashMultiSet;
+import com.fr.third.org.apache.commons.collections4.multiset.PredicatedMultiSet;
+import com.fr.third.org.apache.commons.collections4.multiset.SynchronizedMultiSet;
+import com.fr.third.org.apache.commons.collections4.multiset.UnmodifiableMultiSet;
+import com.fr.third.org.apache.commons.collections4.multiset.HashMultiSet;
+import com.fr.third.org.apache.commons.collections4.multiset.PredicatedMultiSet;
+import com.fr.third.org.apache.commons.collections4.multiset.SynchronizedMultiSet;
+import com.fr.third.org.apache.commons.collections4.multiset.UnmodifiableMultiSet;
+
+/**
+ * Provides utility methods and decorators for {@link MultiSet} instances.
+ *
+ * @since 4.1
+ * @version $Id: MultiSetUtils.java 1714424 2015-11-15 10:06:16Z tn $
+ */
+public class MultiSetUtils {
+
+    /**
+     * An empty unmodifiable multiset.
+     */
+    @SuppressWarnings("rawtypes") // OK, empty multiset is compatible with any type
+    public static final MultiSet EMPTY_MULTISET =
+        UnmodifiableMultiSet.unmodifiableMultiSet(new HashMultiSet<Object>());
+
+    /**
+     * Instantiation of MultiSetUtils is not intended or required.
+     */
+    private MultiSetUtils() {}
+
+    //-----------------------------------------------------------------------
+    /**
+     * Returns a synchronized (thread-safe) multiset backed by the given multiset.
+     * In order to guarantee serial access, it is critical that all access to the
+     * backing multiset is accomplished through the returned multiset.
+     * <p>
+     * It is imperative that the user manually synchronize on the returned multiset
+     * when iterating over it:
+     *
+     * <pre>
+     * MultiSet multiset = MultiSetUtils.synchronizedMultiSet(new HashMultiSet());
+     * ...
+     * synchronized(multiset) {
+     *     Iterator i = multiset.iterator(); // Must be in synchronized block
+     *     while (i.hasNext())
+     *         foo(i.next());
+     *     }
+     * }
+     * </pre>
+     *
+     * Failure to follow this advice may result in non-deterministic behavior.
+     *
+     * @param <E> the element type
+     * @param multiset the multiset to synchronize, must not be null
+     * @return a synchronized multiset backed by that multiset
+     * @throws NullPointerException if the MultiSet is null
+     */
+    public static <E> MultiSet<E> synchronizedMultiSet(final MultiSet<E> multiset) {
+        return SynchronizedMultiSet.synchronizedMultiSet(multiset);
+    }
+
+    /**
+     * Returns an unmodifiable view of the given multiset. Any modification attempts
+     * to the returned multiset will raise an {@link UnsupportedOperationException}.
+     *
+     * @param <E> the element type
+     * @param multiset the multiset whose unmodifiable view is to be returned, must not be null
+     * @return an unmodifiable view of that multiset
+     * @throws NullPointerException if the MultiSet is null
+     */
+    public static <E> MultiSet<E> unmodifiableMultiSet(final MultiSet<? extends E> multiset) {
+        return UnmodifiableMultiSet.unmodifiableMultiSet(multiset);
+    }
+
+    /**
+     * Returns a predicated (validating) multiset backed by the given multiset.
+     * <p>
+     * Only objects that pass the test in the given predicate can be added to
+     * the multiset. Trying to add an invalid object results in an
+     * IllegalArgumentException. It is important not to use the original multiset
+     * after invoking this method, as it is a backdoor for adding invalid
+     * objects.
+     *
+     * @param <E> the element type
+     * @param multiset the multiset to predicate, must not be null
+     * @param predicate the predicate for the multiset, must not be null
+     * @return a predicated multiset backed by the given multiset
+     * @throws NullPointerException if the MultiSet or Predicate is null
+     */
+    public static <E> MultiSet<E> predicatedMultiSet(final MultiSet<E> multiset,
+            final Predicate<? super E> predicate) {
+        return PredicatedMultiSet.predicatedMultiSet(multiset, predicate);
+    }
+
+    /**
+     * Get an empty <code>MultiSet</code>.
+     *
+     * @param <E> the element type
+     * @return an empty MultiSet
+     */
+    @SuppressWarnings("unchecked") // OK, empty multiset is compatible with any type
+    public static <E> MultiSet<E> emptyMultiSet() {
+        return EMPTY_MULTISET;
+    }
+
+}

fine-commons-collections4/src/com/fr/third/org/apache/commons/collections4/MultiValuedMap.java

@@ -0,0 +1,320 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.fr.third.org.apache.commons.collections4;
+
+import java.util.Collection;
+import java.util.Map;
+import java.util.Map.Entry;
+import java.util.Set;
+
+/**
+ * Defines a map that holds a collection of values against each key.
+ * <p>
+ * A {@code MultiValuedMap} is a Map with slightly different semantics:
+ * <ul>
+ *   <li>Putting a value into the map will add the value to a {@link Collection} at that key.</li>
+ *   <li>Getting a value will return a {@link Collection}, holding all the values put to that key.</li>
+ * </ul>
+ * <p>
+ * For example:
+ * <pre>
+ * MultiValuedMap&lt;K, String&gt; map = new MultiValuedHashMap&lt;K, String&gt;();
+ * map.put(key, &quot;A&quot;);
+ * map.put(key, &quot;B&quot;);
+ * map.put(key, &quot;C&quot;);
+ * Collection&lt;String&gt; coll = map.get(key);
+ * </pre>
+ * <p>
+ * <code>coll</code> will be a collection containing "A", "B", "C".
+ * <p>
+ *
+ * @since 4.1
+ * @version $Id: MultiValuedMap.java 1716537 2015-11-25 20:27:24Z tn $
+ */
+public interface MultiValuedMap<K, V> {
+    // Query operations
+
+    /**
+     * Gets the total size of the map.
+     * <p>
+     * Implementations would return the total size of the map which is the count
+     * of the values from all keys.
+     *
+     * @return the total size of the map
+     */
+    int size();
+
+    /**
+     * Returns {@code true} if this map contains no key-value mappings.
+     *
+     * @return {@code true} if this map contains no key-value mappings
+     */
+    boolean isEmpty();
+
+    /**
+     * Returns {@code true} if this map contains a mapping for the specified
+     * key. More formally, returns {@code true} if and only if this map contains
+     * a mapping for a key {@code k} such that {@code (key==null ? k==null : key.equals(k))}.
+     * (There can be at most one such mapping.)
+     *
+     * @param key  key whose presence in this map is to be tested
+     * @return true if this map contains a mapping for the specified key
+     * @throws NullPointerException if the specified key is null and this map
+     *   does not permit null keys (optional)
+     */
+    boolean containsKey(Object key);
+
+    /**
+     * Checks whether the map contains at least one mapping for the specified value.
+     *
+     * @param value  the value to search for
+     * @return true if the map contains the value
+     * @throws NullPointerException if the value is null and null values are not supported
+     *   by the used collection types (optional)
+     */
+    boolean containsValue(Object value);
+
+    /**
+     * Checks whether the map contains a mapping for the specified key and value.
+     *
+     * @param key  the key to search for
+     * @param value  the value to search for
+     * @return true if the map contains the value
+     */
+    boolean containsMapping(Object key, Object value);
+
+    /**
+     * Returns a view collection of the values associated with the specified key.
+     * <p>
+     * This method will return an <b>empty</b> collection if {@link #containsKey(Object)}
+     * returns {@code false}. Changes to the returned collection will update the underlying
+     * {@code MultiValuedMap} and vice-versa.
+     *
+     * @param key  the key to retrieve
+     * @return the {@code Collection} of values, implementations should
+     *   return an empty collection for no mapping
+     * @throws NullPointerException if the key is null and null keys are invalid (optional)
+     */
+    Collection<V> get(K key);
+
+    // Modification operations
+
+    /**
+     * Adds a key-value mapping to this multi-valued map.
+     * <p>
+     * Unlike a normal {@code Map} the previous value is not replaced.
+     * Instead the new value is added to the collection stored against the key.
+     * Depending on the collection type used, duplicate key-value mappings may
+     * be allowed.
+     * <p>
+     * The method will return {@code true} if the size of the multi-valued map
+     * has been increased because of this operation.
+     *
+     * @param key  the key to store against
+     * @param value  the value to add to the collection at the key
+     * @return true if the map changed as a result of this put operation, or false
+     *   if the map already contained the key-value mapping and the collection
+     *   type does not allow duplicate values, e.g. when using a Set
+     * @throws UnsupportedOperationException if the put operation is not supported by
+     *   this multi-valued map, e.g. if it is unmodifiable
+     * @throws NullPointerException if the key or value is null and null is invalid (optional)
+     * @throws IllegalArgumentException if some aspect of the specified key or value prevents
+     *   it from being stored in this multi-valued map
+     */
+    boolean put(K key, V value);
+
+    /**
+     * Adds a mapping to the specified key for all values contained in the given Iterable.
+     *
+     * @param key  the key to store against
+     * @param values  the values to add to the collection at the key, may not be null
+     * @return true if the map changed as a result of this operation
+     * @throws NullPointerException if the specified iterable is null, or if this map
+     *   does not permit null keys or values, and the specified key or values contain
+     *   null (optional)
+     */
+    boolean putAll(K key, Iterable<? extends V> values);
+
+    /**
+     * Copies all mappings from the specified map to this multi-valued map
+     * (optional operation).
+     * <p>
+     * The effect of this call is equivalent to that of calling
+     * {@link #put(Object,Object) put(k, v)} on this map once for each mapping
+     * from key {@code k} to value {@code v} in the specified map.
+     * <p>
+     * The behavior of this operation is undefined if the specified map is modified
+     * while the operation is in progress.
+     *
+     * @param map  mappings to be stored in this map, may not be null
+     * @return true if the map changed as a result of this operation
+     * @throws UnsupportedOperationException if the {@code putAll} operation is
+     *   not supported by this map
+     * @throws NullPointerException if the specified map is null, or if this map
+     *   does not permit null keys or values, and the specified map
+     *   contains null keys or values (optional)
+     * @throws IllegalArgumentException if some property of a key or value in
+     *   the specified map prevents it from being stored in this map
+     */
+    boolean putAll(Map<? extends K, ? extends V> map);
+
+    /**
+     * Copies all mappings from the specified map to this multi-valued map
+     * (optional operation).
+     * <p>
+     * The effect of this call is equivalent to that of calling
+     * {@link #put(Object,Object) put(k, v)} on this map once for each
+     * mapping from key {@code k} to value {@code v} in the specified map.
+     * <p>
+     * The behavior of this operation is undefined if the specified map is modified
+     * while the operation is in progress.
+     *
+     * @param map  mappings to be stored in this map, may not be null
+     * @return true if the map changed as a result of this operation
+     * @throws UnsupportedOperationException if the {@code putAll} operation is
+     *   not supported by this map
+     * @throws NullPointerException if the specified map is null, or if this map
+     *   does not permit null keys or values, and the specified map
+     *   contains null keys or values (optional)
+     * @throws IllegalArgumentException if some property of a key or value in
+     *   the specified map prevents it from being stored in this map
+     */
+    boolean putAll(MultiValuedMap<? extends K, ? extends V> map);
+
+    /**
+     * Removes all values associated with the specified key.
+     * <p>
+     * The returned collection <i>may</i> be modifiable, but updates will not be propagated
+     * to this multi-valued map. In case no mapping was stored for the specified
+     * key, an empty, unmodifiable collection will be returned.
+     *
+     * @param key  the key to remove values from
+     * @return the values that were removed
+     * @throws UnsupportedOperationException if the map is unmodifiable
+     * @throws NullPointerException if the key is null and null keys are invalid (optional)
+     */
+    Collection<V> remove(Object key);
+
+    /**
+     * Removes a key-value mapping from the map.
+     * <p>
+     * The item is removed from the collection mapped to the specified key.
+     * Other values attached to that key are unaffected.
+     * <p>
+     * If the last value for a key is removed, implementations typically return
+     * an empty collection from a subsequent <code>get(Object)</code>.
+     *
+     * @param key  the key to remove from
+     * @param item  the item to remove
+     * @return true if the mapping was removed, false otherwise
+     * @throws UnsupportedOperationException if the map is unmodifiable
+     * @throws NullPointerException if the key or value is null and null is invalid (optional)
+     */
+    boolean removeMapping(Object key, Object item);
+
+    /**
+     * Removes all of the mappings from this map (optional operation).
+     * <p>
+     * The map will be empty after this call returns.
+     *
+     * @throws UnsupportedOperationException if the map is unmodifiable
+     */
+    void clear();
+
+    // Views
+
+    /**
+     * Returns a {@link Collection} view of the mappings contained in this multi-valued map.
+     * <p>
+     * The collection is backed by the map, so changes to the map are reflected
+     * in the collection, and vice-versa.
+     *
+     * @return a set view of the mappings contained in this map
+     */
+    Collection<Entry<K, V>> entries();
+
+    /**
+     * Returns a {@link MultiSet} view of the keys contained in this multi-valued map.
+     * <p>
+     * The {@link MultiSet#getCount(Object)} method of the returned multiset will give
+     * the same result a calling {@code get(Object).size()} for the same key.
+     * <p>
+     * This multiset is backed by the map, so any changes in the map are reflected in
+     * the multiset.
+     *
+     * @return a multiset view of the keys contained in this map
+     */
+    MultiSet<K> keys();
+
+    /**
+     * Returns a {@link Set} view of the keys contained in this multi-valued map.
+     * <p>
+     * The set is backed by the map, so changes to the map are reflected
+     * in the set, and vice-versa.
+     * <p>
+     * If the map is modified while an iteration over the set is in
+     * progress (except through the iterator's own {@code remove} operation),
+     * the result of the iteration is undefined. The set supports element
+     * removal, which removes the corresponding mapping from the map, via the
+     * {@code Iterator.remove}, {@code Set.remove}, {@code removeAll},
+     * {@code retainAll}, and {@code clear} operations. It does not support
+     * the {@code add} or {@code addAll} operations.
+     *
+     * @return a set view of the keys contained in this map
+     */
+    Set<K> keySet();
+
+    /**
+     * Gets a {@link Collection} view of all values contained in this multi-valued map.
+     * <p>
+     * Implementations typically return a collection containing the combination
+     * of values from all keys.
+     *
+     * @return a collection view of the values contained in this multi-valued map
+     */
+    Collection<V> values();
+
+    /**
+     * Returns a view of this multi-valued map as a {@code Map} from each distinct
+     * key to the non-empty collection of that key's associated values.
+     * <p>
+     * Note that {@code this.asMap().get(k)} is equivalent to {@code this.get(k)}
+     * only when {@code k} is a key contained in the multi-valued map; otherwise it
+     * returns {@code null} as opposed to an empty collection.
+     * <p>
+     * Changes to the returned map or the collections that serve as its values
+     * will update the underlying multi-valued map, and vice versa. The map does
+     * not support {@code put} or {@code putAll}, nor do its entries support
+     * {@link Map.Entry#setValue setValue}.
+     *
+     * @return a map view of the mappings in this multi-valued map
+     */
+    Map<K, Collection<V>> asMap();
+
+    // Iterators
+
+    /**
+     * Obtains a <code>MapIterator</code> over this multi-valued map.
+     * <p>
+     * A map iterator is an efficient way of iterating over maps. There is no
+     * need to access the entries collection or use {@code Map.Entry} objects.
+     *
+     * @return a map iterator
+     */
+    MapIterator<K, V> mapIterator();
+
+}

fine-commons-collections4/src/com/fr/third/org/apache/commons/collections4/OrderedBidiMap.java

@@ -0,0 +1,51 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.fr.third.org.apache.commons.collections4;
+
+/**
+ * Defines a map that allows bidirectional lookup between key and values
+ * and retains and provides access to an ordering.
+ * <p>
+ * Implementations should allow a value to be looked up from a key and
+ * a key to be looked up from a value with equal performance.
+ *
+ * @param <K> the type of the keys in the map
+ * @param <V> the type of the values in the map
+ *
+ * @since 3.0
+ * @version $Id: OrderedBidiMap.java 1543260 2013-11-19 00:47:22Z ggregory $
+ */
+public interface OrderedBidiMap<K, V> extends BidiMap<K, V>, OrderedMap<K, V> {
+
+    /**
+     * Gets a view of this map where the keys and values are reversed.
+     * <p>
+     * Changes to one map will be visible in the other and vice versa.
+     * This enables both directions of the map to be accessed equally.
+     * <p>
+     * Implementations should seek to avoid creating a new object every time this
+     * method is called. See <code>AbstractMap.values()</code> etc. Calling this
+     * method on the inverse map should return the original.
+     * <p>
+     * Implementations must return an <code>OrderedBidiMap</code> instance,
+     * usually by forwarding to <code>inverseOrderedBidiMap()</code>.
+     *
+     * @return an inverted bidirectional map
+     */
+    OrderedBidiMap<V, K> inverseBidiMap();
+
+}

fine-commons-collections4/src/com/fr/third/org/apache/commons/collections4/OrderedIterator.java

@@ -0,0 +1,47 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.fr.third.org.apache.commons.collections4;
+
+import java.util.Iterator;
+
+/**
+ * Defines an iterator that operates over an ordered container. Subset of {@link java.util.ListIterator}.
+ * <p>
+ * This iterator allows both forward and reverse iteration through the container.
+ *
+ * @param <E> the type to iterate over
+ * @since 3.0
+ * @version $Id: OrderedIterator.java 1469004 2013-04-17 17:37:03Z tn $
+ */
+public interface OrderedIterator<E> extends Iterator<E> {
+
+    /**
+     * Checks to see if there is a previous element that can be iterated to.
+     *
+     * @return <code>true</code> if the iterator has a previous element
+     */
+    boolean hasPrevious();
+
+    /**
+     * Gets the previous element from the container.
+     *
+     * @return the previous element in the iteration
+     * @throws java.util.NoSuchElementException if the iteration is finished
+     */
+    E previous();
+
+}

fine-commons-collections4/src/com/fr/third/org/apache/commons/collections4/OrderedMap.java

@@ -0,0 +1,73 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.fr.third.org.apache.commons.collections4;
+
+/**
+ * Defines a map that maintains order and allows both forward and backward
+ * iteration through that order.
+ *
+ * @param <K> the type of the keys in the map
+ * @param <V> the type of the values in the map
+ *
+ * @since 3.0
+ * @version $Id: OrderedMap.java 1543259 2013-11-19 00:47:07Z ggregory $
+ */
+public interface OrderedMap<K, V> extends IterableMap<K, V> {
+
+    /**
+     * Obtains an <code>OrderedMapIterator</code> over the map.
+     * <p>
+     * A ordered map iterator is an efficient way of iterating over maps
+     * in both directions.
+     *
+     * @return a map iterator
+     */
+    OrderedMapIterator<K, V> mapIterator();
+
+    /**
+     * Gets the first key currently in this map.
+     *
+     * @return the first key currently in this map
+     * @throws java.util.NoSuchElementException if this map is empty
+     */
+    K firstKey();
+
+    /**
+     * Gets the last key currently in this map.
+     *
+     * @return the last key currently in this map
+     * @throws java.util.NoSuchElementException if this map is empty
+     */
+    K lastKey();
+
+    /**
+     * Gets the next key after the one specified.
+     *
+     * @param key  the key to search for next from
+     * @return the next key, null if no match or at end
+     */
+    K nextKey(K key);
+
+    /**
+     * Gets the previous key before the one specified.
+     *
+     * @param key  the key to search for previous from
+     * @return the previous key, null if no match or at start
+     */
+    K previousKey(K key);
+
+}

fine-commons-collections4/src/com/fr/third/org/apache/commons/collections4/OrderedMapIterator.java

@@ -0,0 +1,46 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.fr.third.org.apache.commons.collections4;
+
+/**
+ * Defines an iterator that operates over an ordered <code>Map</code>.
+ * <p>
+ * This iterator allows both forward and reverse iteration through the map.
+ *
+ * @param <K> the type of the keys in the map
+ * @param <V> the type of the values in the map
+ * @since 3.0
+ * @version $Id: OrderedMapIterator.java 1469004 2013-04-17 17:37:03Z tn $
+ */
+public interface OrderedMapIterator<K, V> extends MapIterator<K, V>, OrderedIterator<K> {
+
+    /**
+     * Checks to see if there is a previous entry that can be iterated to.
+     *
+     * @return <code>true</code> if the iterator has a previous element
+     */
+    boolean hasPrevious();
+
+    /**
+     * Gets the previous <em>key</em> from the <code>Map</code>.
+     *
+     * @return the previous key in the iteration
+     * @throws java.util.NoSuchElementException if the iteration is finished
+     */
+    K previous();
+
+}

fine-commons-collections4/src/com/fr/third/org/apache/commons/collections4/Predicate.java

@@ -0,0 +1,49 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.fr.third.org.apache.commons.collections4;
+
+/**
+ * Defines a functor interface implemented by classes that perform a predicate
+ * test on an object.
+ * <p>
+ * A <code>Predicate</code> is the object equivalent of an <code>if</code> statement.
+ * It uses the input object to return a true or false value, and is often used in
+ * validation or filtering.
+ * <p>
+ * Standard implementations of common predicates are provided by
+ * {@link PredicateUtils}. These include true, false, instanceof, equals, and,
+ * or, not, method invokation and null testing.
+ *
+ * @param <T> the type that the predicate queries
+ *
+ * @since 1.0
+ * @version $Id: Predicate.java 1543262 2013-11-19 00:47:45Z ggregory $
+ */
+public interface Predicate<T> {
+
+    /**
+     * Use the specified parameter to perform a test that returns true or false.
+     *
+     * @param object  the object to evaluate, should not be changed
+     * @return true or false
+     * @throws ClassCastException (runtime) if the input is the wrong class
+     * @throws IllegalArgumentException (runtime) if the input is invalid
+     * @throws FunctorException (runtime) if the predicate encounters a problem
+     */
+    boolean evaluate(T object);
+
+}

fine-commons-collections4/src/com/fr/third/org/apache/commons/collections4/PredicateUtils.java

@@ -0,0 +1,562 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.fr.third.org.apache.commons.collections4;
+
+import java.util.Collection;
+
+import com.fr.third.org.apache.commons.collections4.functors.AllPredicate;
+import com.fr.third.org.apache.commons.collections4.functors.AndPredicate;
+import com.fr.third.org.apache.commons.collections4.functors.AnyPredicate;
+import com.fr.third.org.apache.commons.collections4.functors.EqualPredicate;
+import com.fr.third.org.apache.commons.collections4.functors.ExceptionPredicate;
+import com.fr.third.org.apache.commons.collections4.functors.FalsePredicate;
+import com.fr.third.org.apache.commons.collections4.functors.IdentityPredicate;
+import com.fr.third.org.apache.commons.collections4.functors.InstanceofPredicate;
+import com.fr.third.org.apache.commons.collections4.functors.InvokerTransformer;
+import com.fr.third.org.apache.commons.collections4.functors.NonePredicate;
+import com.fr.third.org.apache.commons.collections4.functors.NotNullPredicate;
+import com.fr.third.org.apache.commons.collections4.functors.NotPredicate;
+import com.fr.third.org.apache.commons.collections4.functors.NullIsExceptionPredicate;
+import com.fr.third.org.apache.commons.collections4.functors.NullIsFalsePredicate;
+import com.fr.third.org.apache.commons.collections4.functors.NullIsTruePredicate;
+import com.fr.third.org.apache.commons.collections4.functors.NullPredicate;
+import com.fr.third.org.apache.commons.collections4.functors.OnePredicate;
+import com.fr.third.org.apache.commons.collections4.functors.OrPredicate;
+import com.fr.third.org.apache.commons.collections4.functors.TransformedPredicate;
+import com.fr.third.org.apache.commons.collections4.functors.TransformerPredicate;
+import com.fr.third.org.apache.commons.collections4.functors.TruePredicate;
+import com.fr.third.org.apache.commons.collections4.functors.UniquePredicate;
+import com.fr.third.org.apache.commons.collections4.functors.AllPredicate;
+import com.fr.third.org.apache.commons.collections4.functors.AndPredicate;
+import com.fr.third.org.apache.commons.collections4.functors.AnyPredicate;
+import com.fr.third.org.apache.commons.collections4.functors.EqualPredicate;
+import com.fr.third.org.apache.commons.collections4.functors.ExceptionPredicate;
+import com.fr.third.org.apache.commons.collections4.functors.FalsePredicate;
+import com.fr.third.org.apache.commons.collections4.functors.IdentityPredicate;
+import com.fr.third.org.apache.commons.collections4.functors.InstanceofPredicate;
+import com.fr.third.org.apache.commons.collections4.functors.InvokerTransformer;
+import com.fr.third.org.apache.commons.collections4.functors.NonePredicate;
+import com.fr.third.org.apache.commons.collections4.functors.NotNullPredicate;
+import com.fr.third.org.apache.commons.collections4.functors.NotPredicate;
+import com.fr.third.org.apache.commons.collections4.functors.NullIsExceptionPredicate;
+import com.fr.third.org.apache.commons.collections4.functors.NullIsFalsePredicate;
+import com.fr.third.org.apache.commons.collections4.functors.NullIsTruePredicate;
+import com.fr.third.org.apache.commons.collections4.functors.NullPredicate;
+import com.fr.third.org.apache.commons.collections4.functors.OnePredicate;
+import com.fr.third.org.apache.commons.collections4.functors.OrPredicate;
+import com.fr.third.org.apache.commons.collections4.functors.TransformedPredicate;
+import com.fr.third.org.apache.commons.collections4.functors.TransformerPredicate;
+import com.fr.third.org.apache.commons.collections4.functors.TruePredicate;
+import com.fr.third.org.apache.commons.collections4.functors.UniquePredicate;
+
+/**
+ * <code>PredicateUtils</code> provides reference implementations and utilities
+ * for the Predicate functor interface. The supplied predicates are:
+ * <ul>
+ * <li>Invoker - returns the result of a method call on the input object
+ * <li>InstanceOf - true if the object is an instanceof a class
+ * <li>Equal - true if the object equals() a specified object
+ * <li>Identity - true if the object == a specified object
+ * <li>Null - true if the object is null
+ * <li>NotNull - true if the object is not null
+ * <li>Unique - true if the object has not already been evaluated
+ * <li>And/All - true if all of the predicates are true
+ * <li>Or/Any - true if any of the predicates is true
+ * <li>Either/One - true if only one of the predicate is true
+ * <li>Neither/None - true if none of the predicates are true
+ * <li>Not - true if the predicate is false, and vice versa
+ * <li>Transformer - wraps a Transformer as a Predicate
+ * <li>True - always return true
+ * <li>False - always return false
+ * <li>Exception - always throws an exception
+ * <li>NullIsException/NullIsFalse/NullIsTrue - check for null input
+ * <li>Transformed - transforms the input before calling the predicate
+ * </ul>
+ * All the supplied predicates are Serializable.
+ *
+ * @since 3.0
+ * @version $Id: PredicateUtils.java 1686855 2015-06-22 13:00:27Z tn $
+ */
+public class PredicateUtils {
+
+    /**
+     * This class is not normally instantiated.
+     */
+    private PredicateUtils() {}
+
+    // Simple predicates
+    //-----------------------------------------------------------------------------
+
+    /**
+     * Gets a Predicate that always throws an exception.
+     * This could be useful during testing as a placeholder.
+     *
+     * @param <T>  the type that the predicate queries
+     * @return the predicate
+     * @see ExceptionPredicate
+     */
+    public static <T> Predicate<T> exceptionPredicate() {
+        return ExceptionPredicate.exceptionPredicate();
+    }
+
+    /**
+     * Gets a Predicate that always returns true.
+     *
+     * @param <T>  the type that the predicate queries
+     * @return the predicate
+     * @see TruePredicate
+     */
+    public static <T> Predicate<T> truePredicate() {
+        return TruePredicate.truePredicate();
+    }
+
+    /**
+     * Gets a Predicate that always returns false.
+     *
+     * @param <T>  the type that the predicate queries
+     * @return the predicate
+     * @see FalsePredicate
+     */
+    public static <T> Predicate<T> falsePredicate() {
+        return FalsePredicate.falsePredicate();
+    }
+
+    /**
+     * Gets a Predicate that checks if the input object passed in is null.
+     *
+     * @param <T>  the type that the predicate queries
+     * @return the predicate
+     * @see NullPredicate
+     */
+    public static <T> Predicate<T> nullPredicate() {
+        return NullPredicate.nullPredicate();
+    }
+
+    /**
+     * Gets a Predicate that checks if the input object passed in is not null.
+     *
+     * @param <T>  the type that the predicate queries
+     * @return the predicate
+     * @see NotNullPredicate
+     */
+    public static <T> Predicate<T> notNullPredicate() {
+        return NotNullPredicate.notNullPredicate();
+    }
+
+    /**
+     * Creates a Predicate that checks if the input object is equal to the
+     * specified object using equals().
+     *
+     * @param <T>  the type that the predicate queries
+     * @param value  the value to compare against
+     * @return the predicate
+     * @see EqualPredicate
+     */
+    public static <T> Predicate<T> equalPredicate(final T value) {
+        return EqualPredicate.equalPredicate(value);
+    }
+
+    /**
+     * Creates a Predicate that checks if the input object is equal to the
+     * specified object by identity.
+     *
+     * @param <T>  the type that the predicate queries
+     * @param value  the value to compare against
+     * @return the predicate
+     * @see IdentityPredicate
+     */
+    public static <T> Predicate<T> identityPredicate(final T value) {
+        return IdentityPredicate.identityPredicate(value);
+    }
+
+    /**
+     * Creates a Predicate that checks if the object passed in is of
+     * a particular type, using instanceof. A <code>null</code> input
+     * object will return <code>false</code>.
+     *
+     * @param type  the type to check for, may not be null
+     * @return the predicate
+     * @throws NullPointerException if the class is null
+     * @see InstanceofPredicate
+     */
+    public static Predicate<Object> instanceofPredicate(final Class<?> type) {
+        return InstanceofPredicate.instanceOfPredicate(type);
+    }
+
+    /**
+     * Creates a Predicate that returns true the first time an object is
+     * encountered, and false if the same object is received
+     * again. The comparison is by equals(). A <code>null</code> input object
+     * is accepted and will return true the first time, and false subsequently
+     * as well.
+     *
+     * @param <T>  the type that the predicate queries
+     * @return the predicate
+     * @see UniquePredicate
+     */
+    public static <T> Predicate<T> uniquePredicate() {
+        // must return new instance each time
+        return UniquePredicate.uniquePredicate();
+    }
+
+    /**
+     * Creates a Predicate that invokes a method on the input object.
+     * The method must return either a boolean or a non-null Boolean,
+     * and have no parameters. If the input object is null, a
+     * PredicateException is thrown.
+     * <p>
+     * For example, <code>PredicateUtils.invokerPredicate("isEmpty");</code>
+     * will call the <code>isEmpty</code> method on the input object to
+     * determine the predicate result.
+     *
+     * @param <T>  the type that the predicate queries
+     * @param methodName  the method name to call on the input object, may not be null
+     * @return the predicate
+     * @throws NullPointerException if the methodName is null.
+     * @see InvokerTransformer
+     * @see TransformerPredicate
+     */
+    public static <T> Predicate<T> invokerPredicate(final String methodName) {
+        // reuse transformer as it has caching - this is lazy really, should have inner class here
+        return asPredicate(InvokerTransformer.<Object, Boolean>invokerTransformer(methodName));
+    }
+
+    /**
+     * Creates a Predicate that invokes a method on the input object.
+     * The method must return either a boolean or a non-null Boolean,
+     * and have no parameters. If the input object is null, a
+     * PredicateException is thrown.
+     * <p>
+     * For example, <code>PredicateUtils.invokerPredicate("isEmpty");</code>
+     * will call the <code>isEmpty</code> method on the input object to
+     * determine the predicate result.
+     *
+     * @param <T>  the type that the predicate queries
+     * @param methodName  the method name to call on the input object, may not be null
+     * @param paramTypes  the parameter types
+     * @param args  the arguments
+     * @return the predicate
+     * @throws NullPointerException if the method name is null
+     * @throws IllegalArgumentException if the paramTypes and args don't match
+     * @see InvokerTransformer
+     * @see TransformerPredicate
+     */
+    public static <T> Predicate<T> invokerPredicate(final String methodName, final Class<?>[] paramTypes,
+                                                    final Object[] args) {
+        // reuse transformer as it has caching - this is lazy really, should have inner class here
+        return asPredicate(InvokerTransformer.<Object, Boolean>invokerTransformer(methodName, paramTypes, args));
+    }
+
+    // Boolean combinations
+    //-----------------------------------------------------------------------------
+
+    /**
+     * Create a new Predicate that returns true only if both of the specified
+     * predicates are true.
+     *
+     * @param <T>  the type that the predicate queries
+     * @param predicate1  the first predicate, may not be null
+     * @param predicate2  the second predicate, may not be null
+     * @return the <code>and</code> predicate
+     * @throws NullPointerException if either predicate is null
+     * @see AndPredicate
+     */
+    public static <T> Predicate<T> andPredicate(final Predicate<? super T> predicate1,
+                                                final Predicate<? super T> predicate2) {
+        return AndPredicate.andPredicate(predicate1, predicate2);
+    }
+
+    /**
+     * Create a new Predicate that returns true only if all of the specified
+     * predicates are true.
+     * If the array of predicates is empty, then this predicate returns true.
+     *
+     * @param <T>  the type that the predicate queries
+     * @param predicates  an array of predicates to check, may not be null
+     * @return the <code>all</code> predicate
+     * @throws NullPointerException if the predicates array is null
+     * @throws NullPointerException if any predicate in the array is null
+     * @see AllPredicate
+     */
+    public static <T> Predicate<T> allPredicate(final Predicate<? super T>... predicates) {
+        return AllPredicate.allPredicate(predicates);
+    }
+
+    /**
+     * Create a new Predicate that returns true only if all of the specified
+     * predicates are true. The predicates are checked in iterator order.
+     * If the collection of predicates is empty, then this predicate returns true.
+     *
+     * @param <T>  the type that the predicate queries
+     * @param predicates  a collection of predicates to check, may not be null
+     * @return the <code>all</code> predicate
+     * @throws NullPointerException if the predicates collection is null
+     * @throws NullPointerException if any predicate in the collection is null
+     * @see AllPredicate
+     */
+    public static <T> Predicate<T> allPredicate(final Collection<? extends Predicate<? super T>> predicates) {
+        return AllPredicate.allPredicate(predicates);
+    }
+
+    /**
+     * Create a new Predicate that returns true if either of the specified
+     * predicates are true.
+     *
+     * @param <T>  the type that the predicate queries
+     * @param predicate1  the first predicate, may not be null
+     * @param predicate2  the second predicate, may not be null
+     * @return the <code>or</code> predicate
+     * @throws NullPointerException if either predicate is null
+     * @see OrPredicate
+     */
+    public static <T> Predicate<T> orPredicate(final Predicate<? super T> predicate1,
+                                               final Predicate<? super T> predicate2) {
+        return OrPredicate.orPredicate(predicate1, predicate2);
+    }
+
+    /**
+     * Create a new Predicate that returns true if any of the specified
+     * predicates are true.
+     * If the array of predicates is empty, then this predicate returns false.
+     *
+     * @param <T>  the type that the predicate queries
+     * @param predicates  an array of predicates to check, may not be null
+     * @return the <code>any</code> predicate
+     * @throws NullPointerException if the predicates array is null
+     * @throws NullPointerException if any predicate in the array is null
+     * @see AnyPredicate
+     */
+    public static <T> Predicate<T> anyPredicate(final Predicate<? super T>... predicates) {
+        return AnyPredicate.anyPredicate(predicates);
+    }
+
+    /**
+     * Create a new Predicate that returns true if any of the specified
+     * predicates are true. The predicates are checked in iterator order.
+     * If the collection of predicates is empty, then this predicate returns false.
+     *
+     * @param <T>  the type that the predicate queries
+     * @param predicates  a collection of predicates to check, may not be null
+     * @return the <code>any</code> predicate
+     * @throws NullPointerException if the predicates collection is null
+     * @throws NullPointerException if any predicate in the collection is null
+     * @see AnyPredicate
+     */
+    public static <T> Predicate<T> anyPredicate(final Collection<? extends Predicate<? super T>> predicates) {
+        return AnyPredicate.anyPredicate(predicates);
+    }
+
+    /**
+     * Create a new Predicate that returns true if one, but not both, of the
+     * specified predicates are true. XOR
+     *
+     * @param <T>  the type that the predicate queries
+     * @param predicate1  the first predicate, may not be null
+     * @param predicate2  the second predicate, may not be null
+     * @return the <code>either</code> predicate
+     * @throws NullPointerException if either predicate is null
+     * @see OnePredicate
+     */
+    public static <T> Predicate<T> eitherPredicate(final Predicate<? super T> predicate1,
+                                                   final Predicate<? super T> predicate2) {
+        @SuppressWarnings("unchecked")
+        final Predicate<T> onePredicate = PredicateUtils.onePredicate(predicate1, predicate2);
+        return onePredicate;
+    }
+
+    /**
+     * Create a new Predicate that returns true if only one of the specified
+     * predicates are true.
+     * If the array of predicates is empty, then this predicate returns false.
+     *
+     * @param <T>  the type that the predicate queries
+     * @param predicates  an array of predicates to check, may not be null
+     * @return the <code>one</code> predicate
+     * @throws NullPointerException if the predicates array is null
+     * @throws NullPointerException if any predicate in the array is null
+     * @see OnePredicate
+     */
+    public static <T> Predicate<T> onePredicate(final Predicate<? super T>... predicates) {
+        return OnePredicate.onePredicate(predicates);
+    }
+
+    /**
+     * Create a new Predicate that returns true if only one of the specified
+     * predicates are true. The predicates are checked in iterator order.
+     * If the collection of predicates is empty, then this predicate returns false.
+     *
+     * @param <T>  the type that the predicate queries
+     * @param predicates  a collection of predicates to check, may not be null
+     * @return the <code>one</code> predicate
+     * @throws NullPointerException if the predicates collection is null
+     * @throws NullPointerException if any predicate in the collection is null
+     * @see OnePredicate
+     */
+    public static <T> Predicate<T> onePredicate(final Collection<? extends Predicate<? super T>> predicates) {
+        return OnePredicate.onePredicate(predicates);
+    }
+
+    /**
+     * Create a new Predicate that returns true if neither of the specified
+     * predicates are true.
+     *
+     * @param <T>  the type that the predicate queries
+     * @param predicate1  the first predicate, may not be null
+     * @param predicate2  the second predicate, may not be null
+     * @return the <code>neither</code> predicate
+     * @throws NullPointerException if either predicate is null
+     * @see NonePredicate
+     */
+    public static <T> Predicate<T> neitherPredicate(final Predicate<? super T> predicate1,
+                                                    final Predicate<? super T> predicate2) {
+        @SuppressWarnings("unchecked")
+        final Predicate<T> nonePredicate = PredicateUtils.nonePredicate(predicate1, predicate2);
+        return nonePredicate;
+    }
+
+    /**
+     * Create a new Predicate that returns true if none of the specified
+     * predicates are true.
+     * If the array of predicates is empty, then this predicate returns true.
+     *
+     * @param <T>  the type that the predicate queries
+     * @param predicates  an array of predicates to check, may not be null
+     * @return the <code>none</code> predicate
+     * @throws NullPointerException if the predicates array is null
+     * @throws NullPointerException if any predicate in the array is null
+     * @see NonePredicate
+     */
+    public static <T> Predicate<T> nonePredicate(final Predicate<? super T>... predicates) {
+        return NonePredicate.nonePredicate(predicates);
+    }
+
+    /**
+     * Create a new Predicate that returns true if none of the specified
+     * predicates are true. The predicates are checked in iterator order.
+     * If the collection of predicates is empty, then this predicate returns true.
+     *
+     * @param <T>  the type that the predicate queries
+     * @param predicates  a collection of predicates to check, may not be null
+     * @return the <code>none</code> predicate
+     * @throws NullPointerException if the predicates collection is null
+     * @throws NullPointerException if any predicate in the collection is null
+     * @see NonePredicate
+     */
+    public static <T> Predicate<T> nonePredicate(final Collection<? extends Predicate<? super T>> predicates) {
+        return NonePredicate.nonePredicate(predicates);
+    }
+
+    /**
+     * Create a new Predicate that returns true if the specified predicate
+     * returns false and vice versa.
+     *
+     * @param <T>  the type that the predicate queries
+     * @param predicate  the predicate to not
+     * @return the <code>not</code> predicate
+     * @throws NullPointerException if the predicate is null
+     * @see NotPredicate
+     */
+    public static <T> Predicate<T> notPredicate(final Predicate<? super T> predicate) {
+        return NotPredicate.notPredicate(predicate);
+    }
+
+    // Adaptors
+    //-----------------------------------------------------------------------------
+
+    /**
+     * Create a new Predicate that wraps a Transformer. The Transformer must
+     * return either Boolean.TRUE or Boolean.FALSE otherwise a PredicateException
+     * will be thrown.
+     *
+     * @param <T>  the type that the predicate queries
+     * @param transformer  the transformer to wrap, may not be null
+     * @return the transformer wrapping predicate
+     * @throws NullPointerException if the transformer is null
+     * @see TransformerPredicate
+     */
+    public static <T> Predicate<T> asPredicate(final Transformer<? super T, Boolean> transformer) {
+        return TransformerPredicate.transformerPredicate(transformer);
+    }
+
+    // Null handlers
+    //-----------------------------------------------------------------------------
+
+    /**
+     * Gets a Predicate that throws an exception if the input object is null,
+     * otherwise it calls the specified Predicate. This allows null handling
+     * behaviour to be added to Predicates that don't support nulls.
+     *
+     * @param <T>  the type that the predicate queries
+     * @param predicate  the predicate to wrap, may not be null
+     * @return the predicate
+     * @throws NullPointerException if the predicate is null.
+     * @see NullIsExceptionPredicate
+     */
+    public static <T> Predicate<T> nullIsExceptionPredicate(final Predicate<? super T> predicate){
+        return NullIsExceptionPredicate.nullIsExceptionPredicate(predicate);
+    }
+
+    /**
+     * Gets a Predicate that returns false if the input object is null, otherwise
+     * it calls the specified Predicate. This allows null handling behaviour to
+     * be added to Predicates that don't support nulls.
+     *
+     * @param <T>  the type that the predicate queries
+     * @param predicate  the predicate to wrap, may not be null
+     * @return the predicate
+     * @throws NullPointerException if the predicate is null.
+     * @see NullIsFalsePredicate
+     */
+    public static <T> Predicate<T> nullIsFalsePredicate(final Predicate<? super T> predicate){
+        return NullIsFalsePredicate.nullIsFalsePredicate(predicate);
+    }
+
+    /**
+     * Gets a Predicate that returns true if the input object is null, otherwise
+     * it calls the specified Predicate. This allows null handling behaviour to
+     * be added to Predicates that don't support nulls.
+     *
+     * @param <T>  the type that the predicate queries
+     * @param predicate  the predicate to wrap, may not be null
+     * @return the predicate
+     * @throws NullPointerException if the predicate is null.
+     * @see NullIsTruePredicate
+     */
+    public static <T> Predicate<T> nullIsTruePredicate(final Predicate<? super T> predicate){
+        return NullIsTruePredicate.nullIsTruePredicate(predicate);
+    }
+
+    // Transformed
+    //-----------------------------------------------------------------------
+    /**
+     * Creates a predicate that transforms the input object before passing it
+     * to the predicate.
+     *
+     * @param <T>  the type that the predicate queries
+     * @param transformer  the transformer to call first
+     * @param predicate  the predicate to call with the result of the transform
+     * @return the predicate
+     * @throws NullPointerException if the transformer or the predicate is null
+     * @see TransformedPredicate
+     * @since 3.1
+     */
+    public static <T> Predicate<T> transformedPredicate(
+            final Transformer<? super T, ? extends T> transformer, final Predicate<? super T> predicate) {
+        return TransformedPredicate.transformedPredicate(transformer, predicate);
+    }
+
+}

fine-commons-collections4/src/com/fr/third/org/apache/commons/collections4/Put.java

@@ -0,0 +1,55 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.fr.third.org.apache.commons.collections4;
+
+import java.util.Map;
+
+/**
+ * The "write" subset of the {@link Map} interface.
+ * <p>
+ * NOTE: in the original {@link Map} interface, {@link Map#put(Object, Object)} is known
+ * to have the same return type as {@link Map#get(Object)}, namely {@code V}. {@link Put}
+ * makes no assumptions in this regard (there is no association with, nor even knowledge
+ * of, a "reading" interface) and thus defines {@link #put(Object, Object)} as returning
+ * {@link Object}.
+ *
+ * @since 4.0
+ * @version $Id: Put.java 1543257 2013-11-19 00:45:55Z ggregory $
+ *
+ * @see Get
+ */
+public interface Put<K, V> {
+
+    /**
+     * @see Map#clear()
+     */
+    void clear();
+
+    /**
+     * Note that the return type is Object, rather than V as in the Map interface.
+     * See the class Javadoc for further info.
+     *
+     * @see Map#put(Object, Object)
+     */
+    Object put(K key, V value);
+
+    /**
+     * @see Map#putAll(Map)
+     */
+    void putAll(Map<? extends K, ? extends V> t);
+
+}

fine-commons-collections4/src/com/fr/third/org/apache/commons/collections4/QueueUtils.java

@@ -0,0 +1,111 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.fr.third.org.apache.commons.collections4;
+
+import java.util.LinkedList;
+import java.util.Queue;
+
+import com.fr.third.org.apache.commons.collections4.queue.PredicatedQueue;
+import com.fr.third.org.apache.commons.collections4.queue.TransformedQueue;
+import com.fr.third.org.apache.commons.collections4.queue.UnmodifiableQueue;
+import com.fr.third.org.apache.commons.collections4.queue.PredicatedQueue;
+import com.fr.third.org.apache.commons.collections4.queue.TransformedQueue;
+import com.fr.third.org.apache.commons.collections4.queue.UnmodifiableQueue;
+
+/**
+ * Provides utility methods and decorators for {@link Queue} instances.
+ *
+ * @since 4.0
+ * @version $Id: QueueUtils.java 1686855 2015-06-22 13:00:27Z tn $
+ */
+public class QueueUtils {
+
+    /**
+     * An empty unmodifiable queue.
+     */
+    @SuppressWarnings("rawtypes") // OK, empty queue is compatible with any type
+    public static final Queue EMPTY_QUEUE = UnmodifiableQueue.unmodifiableQueue(new LinkedList<Object>());
+
+    /**
+     * <code>QueueUtils</code> should not normally be instantiated.
+     */
+    private QueueUtils() {}
+
+    //-----------------------------------------------------------------------
+
+    /**
+     * Returns an unmodifiable queue backed by the given queue.
+     *
+     * @param <E> the type of the elements in the queue
+     * @param queue  the queue to make unmodifiable, must not be null
+     * @return an unmodifiable queue backed by that queue
+     * @throws NullPointerException if the queue is null
+     */
+    public static <E> Queue<E> unmodifiableQueue(final Queue<? extends E> queue) {
+        return UnmodifiableQueue.unmodifiableQueue(queue);
+    }
+
+    /**
+     * Returns a predicated (validating) queue backed by the given queue.
+     * <p>
+     * Only objects that pass the test in the given predicate can be added to the queue.
+     * Trying to add an invalid object results in an IllegalArgumentException.
+     * It is important not to use the original queue after invoking this method,
+     * as it is a backdoor for adding invalid objects.
+     *
+     * @param <E> the type of the elements in the queue
+     * @param queue  the queue to predicate, must not be null
+     * @param predicate  the predicate used to evaluate new elements, must not be null
+     * @return a predicated queue
+     * @throws NullPointerException if the queue or predicate is null
+     */
+    public static <E> Queue<E> predicatedQueue(final Queue<E> queue, final Predicate<? super E> predicate) {
+        return PredicatedQueue.predicatedQueue(queue, predicate);
+    }
+
+    /**
+     * Returns a transformed queue backed by the given queue.
+     * <p>
+     * Each object is passed through the transformer as it is added to the
+     * Queue. It is important not to use the original queue after invoking this
+     * method, as it is a backdoor for adding untransformed objects.
+     * <p>
+     * Existing entries in the specified queue will not be transformed.
+     * If you want that behaviour, see {@link TransformedQueue#transformedQueue}.
+     *
+     * @param <E> the type of the elements in the queue
+     * @param queue  the queue to predicate, must not be null
+     * @param transformer  the transformer for the queue, must not be null
+     * @return a transformed queue backed by the given queue
+     * @throws NullPointerException if the queue or transformer is null
+     */
+    public static <E> Queue<E> transformingQueue(final Queue<E> queue,
+                                                 final Transformer<? super E, ? extends E> transformer) {
+        return TransformedQueue.transformingQueue(queue, transformer);
+    }
+
+    /**
+     * Get an empty <code>Queue</code>.
+     *
+     * @param <E> the type of the elements in the queue
+     * @return an empty {@link Queue}
+     */
+    @SuppressWarnings("unchecked") // OK, empty queue is compatible with any type
+    public static <E> Queue<E> emptyQueue() {
+        return (Queue<E>) EMPTY_QUEUE;
+    }
+}

fine-commons-collections4/src/com/fr/third/org/apache/commons/collections4/ResettableIterator.java

@@ -0,0 +1,38 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.fr.third.org.apache.commons.collections4;
+
+import java.util.Iterator;
+
+/**
+ * Defines an iterator that can be reset back to an initial state.
+ * <p>
+ * This interface allows an iterator to be repeatedly reused.
+ *
+ * @param <E> the type to iterate over
+ * @since 3.0
+ * @version $Id: ResettableIterator.java 1543263 2013-11-19 00:47:55Z ggregory $
+ */
+public interface ResettableIterator<E> extends Iterator<E> {
+
+    /**
+     * Resets the iterator back to the position at which the iterator
+     * was created.
+     */
+    void reset();
+
+}

fine-commons-collections4/src/com/fr/third/org/apache/commons/collections4/ResettableListIterator.java

@@ -0,0 +1,32 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.fr.third.org.apache.commons.collections4;
+
+import java.util.ListIterator;
+
+/**
+ * Defines a list iterator that can be reset back to an initial state.
+ * <p>
+ * This interface allows an iterator to be repeatedly reused.
+ *
+ * @param <E> the type to iterate over
+ * @since 3.0
+ * @version $Id: ResettableListIterator.java 1477779 2013-04-30 18:55:24Z tn $
+ */
+public interface ResettableListIterator<E> extends ListIterator<E>, ResettableIterator<E>, OrderedIterator<E> {
+
+}

fine-commons-collections4/src/com/fr/third/org/apache/commons/collections4/SetUtils.java

@@ -0,0 +1,655 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.fr.third.org.apache.commons.collections4;
+
+import java.util.AbstractSet;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.HashSet;
+import java.util.IdentityHashMap;
+import java.util.Iterator;
+import java.util.NavigableSet;
+import java.util.Set;
+import java.util.SortedSet;
+import java.util.TreeSet;
+
+import com.fr.third.org.apache.commons.collections4.set.ListOrderedSet;
+import com.fr.third.org.apache.commons.collections4.set.PredicatedNavigableSet;
+import com.fr.third.org.apache.commons.collections4.set.PredicatedSet;
+import com.fr.third.org.apache.commons.collections4.set.PredicatedSortedSet;
+import com.fr.third.org.apache.commons.collections4.set.TransformedNavigableSet;
+import com.fr.third.org.apache.commons.collections4.set.TransformedSet;
+import com.fr.third.org.apache.commons.collections4.set.TransformedSortedSet;
+import com.fr.third.org.apache.commons.collections4.set.UnmodifiableNavigableSet;
+import com.fr.third.org.apache.commons.collections4.set.UnmodifiableSet;
+import com.fr.third.org.apache.commons.collections4.set.UnmodifiableSortedSet;
+import com.fr.third.org.apache.commons.collections4.set.ListOrderedSet;
+import com.fr.third.org.apache.commons.collections4.set.PredicatedNavigableSet;
+import com.fr.third.org.apache.commons.collections4.set.PredicatedSet;
+import com.fr.third.org.apache.commons.collections4.set.PredicatedSortedSet;
+import com.fr.third.org.apache.commons.collections4.set.TransformedNavigableSet;
+import com.fr.third.org.apache.commons.collections4.set.TransformedSet;
+import com.fr.third.org.apache.commons.collections4.set.TransformedSortedSet;
+import com.fr.third.org.apache.commons.collections4.set.UnmodifiableNavigableSet;
+import com.fr.third.org.apache.commons.collections4.set.UnmodifiableSet;
+import com.fr.third.org.apache.commons.collections4.set.UnmodifiableSortedSet;
+
+/**
+ * Provides utility methods and decorators for
+ * {@link Set} and {@link SortedSet} instances.
+ *
+ * @since 2.1
+ * @version $Id: SetUtils.java 1686950 2015-06-22 21:51:07Z tn $
+ */
+public class SetUtils {
+
+    /**
+     * Get a typed empty unmodifiable Set.
+     * @param <E> the element type
+     * @return an empty Set
+     */
+    public static <E> Set<E> emptySet() {
+        return Collections.<E>emptySet();
+    }
+
+    /**
+     * An empty unmodifiable sorted set.
+     * This is not provided in the JDK.
+     */
+    @SuppressWarnings("rawtypes")
+    public static final SortedSet EMPTY_SORTED_SET =
+            UnmodifiableSortedSet.unmodifiableSortedSet(new TreeSet<Object>());
+
+    /**
+     * Get a typed empty unmodifiable sorted set.
+     * @param <E> the element type
+     * @return an empty sorted Set
+     */
+    @SuppressWarnings("unchecked") // empty set is OK for any type
+    public static <E> SortedSet<E> emptySortedSet() {
+        return EMPTY_SORTED_SET;
+    }
+
+    /**
+     * <code>SetUtils</code> should not normally be instantiated.
+     */
+    private SetUtils() {}
+
+    //-----------------------------------------------------------------------
+
+    /**
+     * Returns an immutable empty set if the argument is <code>null</code>,
+     * or the argument itself otherwise.
+     *
+     * @param <T> the element type
+     * @param set the set, possibly <code>null</code>
+     * @return an empty set if the argument is <code>null</code>
+     */
+    public static <T> Set<T> emptyIfNull(final Set<T> set) {
+        return set == null ? Collections.<T>emptySet() : set;
+    }
+
+    /**
+     * Tests two sets for equality as per the <code>equals()</code> contract
+     * in {@link java.util.Set#equals(java.lang.Object)}.
+     * <p>
+     * This method is useful for implementing <code>Set</code> when you cannot
+     * extend AbstractSet. The method takes Collection instances to enable other
+     * collection types to use the Set implementation algorithm.
+     * <p>
+     * The relevant text (slightly paraphrased as this is a static method) is:
+     * <blockquote>
+     * <p>Two sets are considered equal if they have
+     * the same size, and every member of the first set is contained in
+     * the second. This ensures that the {@code equals} method works
+     * properly across different implementations of the {@code Set}
+     * interface.</p>
+     *
+     * <p>
+     * This implementation first checks if the two sets are the same object:
+     * if so it returns {@code true}.  Then, it checks if the two sets are
+     * identical in size; if not, it returns false. If so, it returns
+     * {@code a.containsAll((Collection) b)}.</p>
+     * </blockquote>
+     *
+     * @see java.util.Set
+     * @param set1  the first set, may be null
+     * @param set2  the second set, may be null
+     * @return whether the sets are equal by value comparison
+     */
+    public static boolean isEqualSet(final Collection<?> set1, final Collection<?> set2) {
+        if (set1 == set2) {
+            return true;
+        }
+        if (set1 == null || set2 == null || set1.size() != set2.size()) {
+            return false;
+        }
+
+        return set1.containsAll(set2);
+    }
+
+    /**
+     * Generates a hash code using the algorithm specified in
+     * {@link java.util.Set#hashCode()}.
+     * <p>
+     * This method is useful for implementing <code>Set</code> when you cannot
+     * extend AbstractSet. The method takes Collection instances to enable other
+     * collection types to use the Set implementation algorithm.
+     *
+     * @param <T> the element type
+     * @see java.util.Set#hashCode()
+     * @param set  the set to calculate the hash code for, may be null
+     * @return the hash code
+     */
+    public static <T> int hashCodeForSet(final Collection<T> set) {
+        if (set == null) {
+            return 0;
+        }
+
+        int hashCode = 0;
+        for (final T obj : set) {
+            if (obj != null) {
+                hashCode += obj.hashCode();
+            }
+        }
+        return hashCode;
+    }
+
+    /**
+     * Returns a new hash set that matches elements based on <code>==</code> not
+     * <code>equals()</code>.
+     * <p>
+     * <strong>This set will violate the detail of various Set contracts.</note>
+     * As a general rule, don't compare this set to other sets. In particular, you can't
+     * use decorators like {@link ListOrderedSet} on it, which silently assume that these
+     * contracts are fulfilled.</strong>
+     * <p>
+     * <strong>Note that the returned set is not synchronized and is not thread-safe.</strong>
+     * If you wish to use this set from multiple threads concurrently, you must use
+     * appropriate synchronization. The simplest approach is to wrap this map
+     * using {@link java.util.Collections#synchronizedSet(Set)}. This class may throw
+     * exceptions when accessed by concurrent threads without synchronization.
+     *
+     * @param <E>  the element type
+     * @return a new identity hash set
+     * @since 4.1
+     */
+    public static <E> Set<E> newIdentityHashSet() {
+        return Collections.newSetFromMap(new IdentityHashMap<E, Boolean>());
+    }
+
+    // Set
+    //-----------------------------------------------------------------------
+    /**
+     * Returns a synchronized set backed by the given set.
+     * <p>
+     * You must manually synchronize on the returned set's iterator to
+     * avoid non-deterministic behavior:
+     *
+     * <pre>
+     * Set s = SetUtils.synchronizedSet(mySet);
+     * synchronized (s) {
+     *     Iterator i = s.iterator();
+     *     while (i.hasNext()) {
+     *         process (i.next());
+     *     }
+     * }
+     * </pre>
+     *
+     * This method is just a wrapper for {@link Collections#synchronizedSet(Set)}.
+     *
+     * @param <E> the element type
+     * @param set  the set to synchronize, must not be null
+     * @return a synchronized set backed by the given set
+     * @throws NullPointerException if the set is null
+     */
+    public static <E> Set<E> synchronizedSet(final Set<E> set) {
+        return Collections.synchronizedSet(set);
+    }
+
+    /**
+     * Returns an unmodifiable set backed by the given set.
+     * <p>
+     * This method uses the implementation in the decorators subpackage.
+     *
+     * @param <E> the element type
+     * @param set  the set to make unmodifiable, must not be null
+     * @return an unmodifiable set backed by the given set
+     * @throws NullPointerException if the set is null
+     */
+    public static <E> Set<E> unmodifiableSet(final Set<? extends E> set) {
+        return UnmodifiableSet.unmodifiableSet(set);
+    }
+
+    /**
+     * Returns a predicated (validating) set backed by the given set.
+     * <p>
+     * Only objects that pass the test in the given predicate can be added to the set.
+     * Trying to add an invalid object results in an IllegalArgumentException.
+     * It is important not to use the original set after invoking this method,
+     * as it is a backdoor for adding invalid objects.
+     *
+     * @param <E> the element type
+     * @param set  the set to predicate, must not be null
+     * @param predicate  the predicate for the set, must not be null
+     * @return a predicated set backed by the given set
+     * @throws NullPointerException if the set or predicate is null
+     */
+    public static <E> Set<E> predicatedSet(final Set<E> set, final Predicate<? super E> predicate) {
+        return PredicatedSet.predicatedSet(set, predicate);
+    }
+
+    /**
+     * Returns a transformed set backed by the given set.
+     * <p>
+     * Each object is passed through the transformer as it is added to the
+     * Set. It is important not to use the original set after invoking this
+     * method, as it is a backdoor for adding untransformed objects.
+     * <p>
+     * Existing entries in the specified set will not be transformed.
+     * If you want that behaviour, see {@link TransformedSet#transformedSet}.
+     *
+     * @param <E> the element type
+     * @param set  the set to transform, must not be null
+     * @param transformer  the transformer for the set, must not be null
+     * @return a transformed set backed by the given set
+     * @throws NullPointerException if the set or transformer is null
+     */
+    public static <E> Set<E> transformedSet(final Set<E> set,
+                                            final Transformer<? super E, ? extends E> transformer) {
+        return TransformedSet.transformingSet(set, transformer);
+    }
+
+    /**
+     * Returns a set that maintains the order of elements that are added
+     * backed by the given set.
+     * <p>
+     * If an element is added twice, the order is determined by the first add.
+     * The order is observed through the iterator or toArray.
+     *
+     * @param <E> the element type
+     * @param set  the set to order, must not be null
+     * @return an ordered set backed by the given set
+     * @throws NullPointerException if the set is null
+     */
+    public static <E> Set<E> orderedSet(final Set<E> set) {
+        return ListOrderedSet.listOrderedSet(set);
+    }
+
+    // SortedSet
+    //-----------------------------------------------------------------------
+    /**
+     * Returns a synchronized sorted set backed by the given sorted set.
+     * <p>
+     * You must manually synchronize on the returned set's iterator to
+     * avoid non-deterministic behavior:
+     *
+     * <pre>
+     * Set s = SetUtils.synchronizedSortedSet(mySet);
+     * synchronized (s) {
+     *     Iterator i = s.iterator();
+     *     while (i.hasNext()) {
+     *         process (i.next());
+     *     }
+     * }
+     * </pre>
+     *
+     * This method is just a wrapper for {@link Collections#synchronizedSortedSet(SortedSet)}.
+     *
+     * @param <E> the element type
+     * @param set  the sorted set to synchronize, must not be null
+     * @return a synchronized set backed by the given set
+     * @throws NullPointerException if the set is null
+     */
+    public static <E> SortedSet<E> synchronizedSortedSet(final SortedSet<E> set) {
+        return Collections.synchronizedSortedSet(set);
+    }
+
+    /**
+     * Returns an unmodifiable sorted set backed by the given sorted set.
+     * <p>
+     * This method uses the implementation in the decorators subpackage.
+     *
+     * @param <E> the element type
+     * @param set  the sorted set to make unmodifiable, must not be null
+     * @return an unmodifiable set backed by the given set
+     * @throws NullPointerException if the set is null
+     */
+    public static <E> SortedSet<E> unmodifiableSortedSet(final SortedSet<E> set) {
+        return UnmodifiableSortedSet.unmodifiableSortedSet(set);
+    }
+
+    /**
+     * Returns a predicated (validating) sorted set backed by the given sorted set.
+     * <p>
+     * Only objects that pass the test in the given predicate can be added to the set.
+     * Trying to add an invalid object results in an IllegalArgumentException.
+     * It is important not to use the original set after invoking this method,
+     * as it is a backdoor for adding invalid objects.
+     *
+     * @param <E> the element type
+     * @param set  the sorted set to predicate, must not be null
+     * @param predicate  the predicate for the sorted set, must not be null
+     * @return a predicated sorted set backed by the given sorted set
+     * @throws NullPointerException if the set or predicate is null
+     */
+    public static <E> SortedSet<E> predicatedSortedSet(final SortedSet<E> set,
+                                                       final Predicate<? super E> predicate) {
+        return PredicatedSortedSet.predicatedSortedSet(set, predicate);
+    }
+
+    /**
+     * Returns a transformed sorted set backed by the given set.
+     * <p>
+     * Each object is passed through the transformer as it is added to the
+     * Set. It is important not to use the original set after invoking this
+     * method, as it is a backdoor for adding untransformed objects.
+     * <p>
+     * Existing entries in the specified set will not be transformed.
+     * If you want that behaviour, see {@link TransformedSortedSet#transformedSortedSet}.
+     *
+     * @param <E> the element type
+     * @param set  the set to transform, must not be null
+     * @param transformer  the transformer for the set, must not be null
+     * @return a transformed set backed by the given set
+     * @throws NullPointerException if the set or transformer is null
+     */
+    public static <E> SortedSet<E> transformedSortedSet(final SortedSet<E> set,
+                                                        final Transformer<? super E, ? extends E> transformer) {
+        return TransformedSortedSet.transformingSortedSet(set, transformer);
+    }
+
+    // NavigableSet
+    //-----------------------------------------------------------------------
+    /**
+     * Returns an unmodifiable navigable set backed by the given navigable set.
+     * <p>
+     * This method uses the implementation in the decorators subpackage.
+     *
+     * @param <E> the element type
+     * @param set  the navigable set to make unmodifiable, must not be null
+     * @return an unmodifiable set backed by the given set
+     * @throws NullPointerException if the set is null
+     * @since 4.1
+     */
+    public static <E> SortedSet<E> unmodifiableNavigableSet(final NavigableSet<E> set) {
+        return UnmodifiableNavigableSet.unmodifiableNavigableSet(set);
+    }
+
+    /**
+     * Returns a predicated (validating) navigable set backed by the given navigable set.
+     * <p>
+     * Only objects that pass the test in the given predicate can be added to the set.
+     * Trying to add an invalid object results in an IllegalArgumentException.
+     * It is important not to use the original set after invoking this method,
+     * as it is a backdoor for adding invalid objects.
+     *
+     * @param <E> the element type
+     * @param set  the navigable set to predicate, must not be null
+     * @param predicate  the predicate for the navigable set, must not be null
+     * @return a predicated navigable set backed by the given navigable set
+     * @throws NullPointerException if the set or predicate is null
+     * @since 4.1
+     */
+    public static <E> SortedSet<E> predicatedNavigableSet(final NavigableSet<E> set,
+                                                          final Predicate<? super E> predicate) {
+        return PredicatedNavigableSet.predicatedNavigableSet(set, predicate);
+    }
+
+    /**
+     * Returns a transformed navigable set backed by the given navigable set.
+     * <p>
+     * Each object is passed through the transformer as it is added to the
+     * Set. It is important not to use the original set after invoking this
+     * method, as it is a backdoor for adding untransformed objects.
+     * <p>
+     * Existing entries in the specified set will not be transformed.
+     * If you want that behaviour, see {@link TransformedNavigableSet#transformedNavigableSet}.
+     *
+     * @param <E> the element type
+     * @param set  the navigable set to transform, must not be null
+     * @param transformer  the transformer for the set, must not be null
+     * @return a transformed set backed by the given set
+     * @throws NullPointerException if the set or transformer is null
+     * @since 4.1
+     */
+    public static <E> SortedSet<E> transformedNavigableSet(final NavigableSet<E> set,
+                                                           final Transformer<? super E, ? extends E> transformer) {
+        return TransformedNavigableSet.transformingNavigableSet(set, transformer);
+    }
+
+    // Set operations
+    //-----------------------------------------------------------------------
+
+    /**
+     * Returns a unmodifiable <b>view</b> of the union of the given {@link Set}s.
+     * <p>
+     * The returned view contains all elements of {@code a} and {@code b}.
+     *
+     * @param <E> the generic type that is able to represent the types contained
+     *   in both input sets.
+     * @param a  the first set, must not be null
+     * @param b  the second set, must not be null
+     * @return a view of the union of the two set
+     * @throws NullPointerException if either input set is null
+     * @since 4.1
+     */
+    public static <E> SetView<E> union(final Set<? extends E> a, final Set<? extends E> b) {
+        if (a == null || b == null) {
+            throw new NullPointerException("Sets must not be null.");
+        }
+
+        final SetView<E> bMinusA = difference(b, a);
+
+        return new SetView<E>() {
+            @Override
+            public boolean contains(Object o) {
+                return a.contains(o) || b.contains(o);
+            }
+
+            @Override
+            public Iterator<E> createIterator() {
+                return IteratorUtils.chainedIterator(a.iterator(), bMinusA.iterator());
+            }
+
+            @Override
+            public boolean isEmpty() {
+                return a.isEmpty() && b.isEmpty();
+            }
+
+            @Override
+            public int size() {
+                return a.size() + bMinusA.size();
+            }
+        };
+    }
+
+    /**
+     * Returns a unmodifiable <b>view</b> containing the difference of the given
+     * {@link Set}s, denoted by {@code a \ b} (or {@code a - b}).
+     * <p>
+     * The returned view contains all elements of {@code a} that are not a member
+     * of {@code b}.
+     *
+     * @param <E> the generic type that is able to represent the types contained
+     *   in both input sets.
+     * @param a  the set to subtract from, must not be null
+     * @param b  the set to subtract, must not be null
+     * @return a view of the relative complement of  of the two sets
+     * @since 4.1
+     */
+    public static <E> SetView<E> difference(final Set<? extends E> a, final Set<? extends E> b) {
+        if (a == null || b == null) {
+            throw new NullPointerException("Sets must not be null.");
+        }
+
+        final Predicate<E> notContainedInB = new Predicate<E>() {
+            @Override
+            public boolean evaluate(E object) {
+                return !b.contains(object);
+            }
+        };
+
+        return new SetView<E>() {
+            @Override
+            public boolean contains(Object o) {
+                return a.contains(o) && !b.contains(o);
+            }
+
+            @Override
+            public Iterator<E> createIterator() {
+                return IteratorUtils.filteredIterator(a.iterator(), notContainedInB);
+            }
+        };
+    }
+
+    /**
+     * Returns a unmodifiable <b>view</b> of the intersection of the given {@link Set}s.
+     * <p>
+     * The returned view contains all elements that are members of both input sets
+     * ({@code a} and {@code b}).
+     *
+     * @param <E> the generic type that is able to represent the types contained
+     *   in both input sets.
+     * @param a  the first set, must not be null
+     * @param b  the second set, must not be null
+     * @return a view of the intersection of the two sets
+     * @since 4.1
+     */
+    public static <E> SetView<E> intersection(final Set<? extends E> a, final Set<? extends E> b) {
+        if (a == null || b == null) {
+            throw new NullPointerException("Sets must not be null.");
+        }
+
+        final Predicate<E> containedInB = new Predicate<E>() {
+            @Override
+            public boolean evaluate(E object) {
+                return b.contains(object);
+            }
+        };
+
+        return new SetView<E>() {
+            @Override
+            public boolean contains(Object o) {
+                return a.contains(o) && b.contains(o);
+            }
+
+            @Override
+            public Iterator<E> createIterator() {
+                return IteratorUtils.filteredIterator(a.iterator(), containedInB);
+            }
+        };
+    }
+
+    /**
+     * Returns a unmodifiable <b>view</b> of the symmetric difference of the given
+     * {@link Set}s.
+     * <p>
+     * The returned view contains all elements of {@code a} and {@code b} that are
+     * not a member of the other set.
+     * <p>
+     * This is equivalent to {@code union(difference(a, b), difference(b, a))}.
+     *
+     * @param <E> the generic type that is able to represent the types contained
+     *   in both input sets.
+     * @param a  the first set, must not be null
+     * @param b  the second set, must not be null
+     * @return a view of the symmetric difference of the two sets
+     * @since 4.1
+     */
+    public static <E> SetView<E> disjunction(final Set<? extends E> a, final Set<? extends E> b) {
+        if (a == null || b == null) {
+            throw new NullPointerException("Sets must not be null.");
+        }
+
+        final SetView<E> aMinusB = difference(a, b);
+        final SetView<E> bMinusA = difference(b, a);
+
+        return new SetView<E>() {
+            @Override
+            public boolean contains(Object o) {
+                return a.contains(o) ^ b.contains(o);
+            }
+
+            @Override
+            public Iterator<E> createIterator() {
+                return IteratorUtils.chainedIterator(aMinusB.iterator(), bMinusA.iterator());
+            }
+
+            @Override
+            public boolean isEmpty() {
+                return aMinusB.isEmpty() && bMinusA.isEmpty();
+            }
+
+            @Override
+            public int size() {
+                return aMinusB.size() + bMinusA.size();
+            }
+        };
+    }
+
+    /**
+     * An unmodifiable <b>view</b> of a set that may be backed by other sets.
+     * <p>
+     * If the decorated sets change, this view will change as well. The contents
+     * of this view can be transferred to another instance via the {@link #copyInto(Set)}
+     * and {@link #toSet()} methods.
+     *
+     * @param <E> the element type
+     * @since 4.1
+     */
+    public static abstract class SetView<E> extends AbstractSet<E> {
+
+        @Override
+        public Iterator<E> iterator() {
+            return IteratorUtils.unmodifiableIterator(createIterator());
+        }
+
+        /**
+         * Return an iterator for this view; the returned iterator is
+         * not required to be unmodifiable.
+         * @return a new iterator for this view
+         */
+        protected abstract Iterator<E> createIterator();
+
+        @Override
+        public int size() {
+            return IteratorUtils.size(iterator());
+        }
+
+        /**
+         * Copies the contents of this view into the provided set.
+         *
+         * @param <S> the set type
+         * @param set  the set for copying the contents
+         */
+        public <S extends Set<E>> void copyInto(final S set) {
+            CollectionUtils.addAll(set, this);
+        }
+
+        /**
+         * Returns a new set containing the contents of this view.
+         *
+         * @return a new set containing all elements of this view
+         */
+        public Set<E> toSet() {
+            final Set<E> set = new HashSet<E>(size());
+            copyInto(set);
+            return set;
+        }
+    }
+}

fine-commons-collections4/src/com/fr/third/org/apache/commons/collections4/SetValuedMap.java

@@ -0,0 +1,65 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.fr.third.org.apache.commons.collections4;
+
+import java.util.Set;
+
+/**
+ * Defines a map that holds a set of values against each key.
+ * <p>
+ * A {@code SetValuedMap} is a Map with slightly different semantics:
+ * <ul>
+ *   <li>Putting a value into the map will add the value to a {@link Set} at that key.</li>
+ *   <li>Getting a value will return a {@link Set}, holding all the values put to that key.</li>
+ * </ul>
+ *
+ * @since 4.1
+ * @version $Id: SetValuedMap.java 1685299 2015-06-13 18:27:11Z tn $
+ */
+public interface SetValuedMap<K, V> extends MultiValuedMap<K, V> {
+
+    /**
+     * Gets the set of values associated with the specified key.
+     * <p>
+     * Implementations typically return an empty {@code Set} if no values
+     * have been mapped to the key.
+     * <p>
+     *
+     * @param key  the key to retrieve
+     * @return the {@code Set} of values, implementations should return an
+     *   empty {@code Set} for no mapping
+     * @throws NullPointerException if the key is null and null keys are invalid
+     */
+    @Override
+    Set<V> get(K key);
+
+    /**
+     * Removes all values associated with the specified key.
+     * <p>
+     * The returned set <i>may</i> be modifiable, but updates will not be
+     * propagated to this set-valued map. In case no mapping was stored for the
+     * specified key, an empty, unmodifiable set will be returned.
+     *
+     * @param key  the key to remove values from
+     * @return the {@code Set} of values removed, implementations should
+     *   return null for no mapping found, but may return an empty collection
+     * @throws UnsupportedOperationException if the map is unmodifiable
+     * @throws NullPointerException if the key is null and null keys are invalid
+     */
+    @Override
+    Set<V> remove(Object key);
+}

fine-commons-collections4/src/com/fr/third/org/apache/commons/collections4/SortedBag.java

@@ -0,0 +1,53 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.fr.third.org.apache.commons.collections4;
+
+import java.util.Comparator;
+
+/**
+ * Defines a type of <code>Bag</code> that maintains a sorted order among
+ * its unique representative members.
+ *
+ * @param <E> the type to iterate over
+ * @since 2.0
+ * @version $Id: SortedBag.java 1543264 2013-11-19 00:48:12Z ggregory $
+ */
+public interface SortedBag<E> extends Bag<E> {
+
+    /**
+     * Returns the comparator associated with this sorted set, or null
+     * if it uses its elements' natural ordering.
+     *
+     * @return the comparator in use, or null if natural ordering
+     */
+    Comparator<? super E> comparator();
+
+    /**
+     * Returns the first (lowest) member.
+     *
+     * @return the first element in the sorted bag
+     */
+    E first();
+
+    /**
+     * Returns the last (highest) member.
+     *
+     * @return the last element in the sorted bag
+     */
+    E last();
+
+}

fine-commons-collections4/src/com/fr/third/org/apache/commons/collections4/SortedBidiMap.java

@@ -0,0 +1,58 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.fr.third.org.apache.commons.collections4;
+
+import java.util.Comparator;
+import java.util.SortedMap;
+
+/**
+ * Defines a map that allows bidirectional lookup between key and values
+ * and retains both keys and values in sorted order.
+ * <p>
+ * Implementations should allow a value to be looked up from a key and
+ * a key to be looked up from a value with equal performance.
+ *
+ * @param <K> the type of the keys in the map
+ * @param <V> the type of the values in the map
+ * @since 3.0
+ * @version $Id: SortedBidiMap.java 1543255 2013-11-19 00:45:24Z ggregory $
+ */
+public interface SortedBidiMap<K, V> extends OrderedBidiMap<K, V>, SortedMap<K, V> {
+
+    /**
+     * Gets a view of this map where the keys and values are reversed.
+     * <p>
+     * Changes to one map will be visible in the other and vice versa.
+     * This enables both directions of the map to be accessed equally.
+     * <p>
+     * Implementations should seek to avoid creating a new object every time this
+     * method is called. See <code>AbstractMap.values()</code> etc. Calling this
+     * method on the inverse map should return the original.
+     * <p>
+     * Implementations must return a <code>SortedBidiMap</code> instance,
+     * usually by forwarding to <code>inverseSortedBidiMap()</code>.
+     *
+     * @return an inverted bidirectional map
+     */
+    SortedBidiMap<V, K> inverseBidiMap();
+
+    /**
+     * Get the comparator used for the values in the value-to-key map aspect.
+     * @return Comparator<? super V>
+     */
+    Comparator<? super V> valueComparator();
+}

fine-commons-collections4/src/com/fr/third/org/apache/commons/collections4/SplitMapUtils.java

@@ -0,0 +1,250 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.fr.third.org.apache.commons.collections4;
+
+import java.util.Collection;
+import java.util.Map;
+import java.util.Set;
+
+import com.fr.third.org.apache.commons.collections4.map.EntrySetToMapIteratorAdapter;
+import com.fr.third.org.apache.commons.collections4.map.UnmodifiableEntrySet;
+import com.fr.third.org.apache.commons.collections4.set.UnmodifiableSet;
+import com.fr.third.org.apache.commons.collections4.collection.UnmodifiableCollection;
+import com.fr.third.org.apache.commons.collections4.iterators.UnmodifiableMapIterator;
+import com.fr.third.org.apache.commons.collections4.map.EntrySetToMapIteratorAdapter;
+import com.fr.third.org.apache.commons.collections4.map.UnmodifiableEntrySet;
+import com.fr.third.org.apache.commons.collections4.set.UnmodifiableSet;
+
+/**
+ * Utilities for working with "split maps:" objects that implement {@link Put}
+ * and/or {@link Get} but not {@link Map}.
+ *
+ * @since 4.0
+ * @version $Id: SplitMapUtils.java 1686855 2015-06-22 13:00:27Z tn $
+ *
+ * @see Get
+ * @see Put
+ */
+public class SplitMapUtils {
+
+    /**
+     * <code>SplitMapUtils</code> should not normally be instantiated.
+     */
+    private SplitMapUtils() {}
+
+    //-----------------------------------------------------------------------
+
+    private static class WrappedGet<K, V> implements IterableMap<K, V>, Unmodifiable {
+        private final Get<K, V> get;
+
+        private WrappedGet(final Get<K, V> get) {
+            this.get = get;
+        }
+
+        public void clear() {
+            throw new UnsupportedOperationException();
+        }
+
+        public boolean containsKey(final Object key) {
+            return get.containsKey(key);
+        }
+
+        public boolean containsValue(final Object value) {
+            return get.containsValue(value);
+        }
+
+        public Set<Map.Entry<K, V>> entrySet() {
+            return UnmodifiableEntrySet.unmodifiableEntrySet(get.entrySet());
+        }
+
+        @Override
+        public boolean equals(final Object arg0) {
+            if (arg0 == this) {
+                return true;
+            }
+            return arg0 instanceof WrappedGet && ((WrappedGet<?, ?>) arg0).get.equals(this.get);
+        }
+
+        public V get(final Object key) {
+            return get.get(key);
+        }
+
+        @Override
+        public int hashCode() {
+            return ("WrappedGet".hashCode() << 4) | get.hashCode();
+        }
+
+        public boolean isEmpty() {
+            return get.isEmpty();
+        }
+
+        public Set<K> keySet() {
+            return UnmodifiableSet.unmodifiableSet(get.keySet());
+        }
+
+        public V put(final K key, final V value) {
+            throw new UnsupportedOperationException();
+        }
+
+        public void putAll(final Map<? extends K, ? extends V> t) {
+            throw new UnsupportedOperationException();
+        }
+
+        public V remove(final Object key) {
+            return get.remove(key);
+        }
+
+        public int size() {
+            return get.size();
+        }
+
+        public Collection<V> values() {
+            return UnmodifiableCollection.unmodifiableCollection(get.values());
+        }
+
+        public MapIterator<K, V> mapIterator() {
+            MapIterator<K, V> it;
+            if (get instanceof IterableGet) {
+                it = ((IterableGet<K, V>) get).mapIterator();
+            } else {
+                it = new EntrySetToMapIteratorAdapter<K, V>(get.entrySet());
+            }
+            return UnmodifiableMapIterator.unmodifiableMapIterator(it);
+        }
+    }
+
+    private static class WrappedPut<K, V> implements Map<K, V>, Put<K, V> {
+        private final Put<K, V> put;
+
+        private WrappedPut(final Put<K, V> put) {
+            this.put = put;
+        }
+
+        public void clear() {
+            put.clear();
+        }
+
+        public boolean containsKey(final Object key) {
+            throw new UnsupportedOperationException();
+        }
+
+        public boolean containsValue(final Object value) {
+            throw new UnsupportedOperationException();
+        }
+
+        public Set<Map.Entry<K, V>> entrySet() {
+            throw new UnsupportedOperationException();
+        }
+
+        @Override
+        public boolean equals(final Object obj) {
+            if (obj == this) {
+                return true;
+            }
+            return obj instanceof WrappedPut && ((WrappedPut<?, ?>) obj).put.equals(this.put);
+        }
+
+        public V get(final Object key) {
+            throw new UnsupportedOperationException();
+        }
+
+        @Override
+        public int hashCode() {
+            return ("WrappedPut".hashCode() << 4) | put.hashCode();
+        }
+
+        public boolean isEmpty() {
+            throw new UnsupportedOperationException();
+        }
+
+        public Set<K> keySet() {
+            throw new UnsupportedOperationException();
+        }
+
+        @SuppressWarnings("unchecked")
+        public V put(final K key, final V value) {
+            return (V) put.put(key, value);
+        }
+
+        public void putAll(final Map<? extends K, ? extends V> t) {
+            put.putAll(t);
+        }
+
+        public V remove(final Object key) {
+            throw new UnsupportedOperationException();
+        }
+
+        public int size() {
+            throw new UnsupportedOperationException();
+        }
+
+        public Collection<V> values() {
+            throw new UnsupportedOperationException();
+        }
+    }
+
+    //-----------------------------------------------------------------------
+
+    /**
+     * Get the specified {@link Get} as an instance of {@link IterableMap}.
+     * If <code>get</code> implements {@link IterableMap} directly, no conversion will take place.
+     * If <code>get</code> implements {@link Map} but not {@link IterableMap} it will be decorated.
+     * Otherwise an {@link Unmodifiable} {@link IterableMap} will be returned.
+     * @param <K> the key type
+     * @param <V> the value type
+     * @param get to wrap, must not be null
+     * @return {@link IterableMap}
+     * @throws NullPointerException if the argument is null
+     */
+    @SuppressWarnings("unchecked")
+    public static <K, V> IterableMap<K, V> readableMap(final Get<K, V> get) {
+        if (get == null) {
+            throw new NullPointerException("Get must not be null");
+        }
+        if (get instanceof Map) {
+            return get instanceof IterableMap ?
+                    ((IterableMap<K, V>) get) :
+                    MapUtils.iterableMap((Map<K, V>) get);
+        }
+        return new WrappedGet<K, V>(get);
+    }
+
+    /**
+     * Get the specified {@link Put} as an instanceof {@link Map}.
+     * If <code>put</code> implements {@link Map} directly, no conversion will take place.
+     * Otherwise a <em>write-only</em> {@link Map} will be returned.  On such a {@link Map}
+     * it is recommended that the result of #put(K, V) be discarded as it likely will not
+     * match <code>V</code> at runtime.
+     *
+     * @param <K> the key type
+     * @param <V> the element type
+     * @param put to wrap, must not be null
+     * @return {@link Map}
+     * @throws NullPointerException if the argument is null
+     */
+    @SuppressWarnings("unchecked")
+    public static <K, V> Map<K, V> writableMap(final Put<K, V> put) {
+        if (put == null) {
+            throw new NullPointerException("Put must not be null");
+        }
+        if (put instanceof Map) {
+            return (Map<K, V>) put;
+        }
+        return new WrappedPut<K, V>(put);
+    }
+
+}

fine-commons-collections4/src/com/fr/third/org/apache/commons/collections4/Transformer.java

@@ -0,0 +1,51 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.fr.third.org.apache.commons.collections4;
+
+/**
+ * Defines a functor interface implemented by classes that transform one
+ * object into another.
+ * <p>
+ * A <code>Transformer</code> converts the input object to the output object.
+ * The input object should be left unchanged.
+ * Transformers are typically used for type conversions, or extracting data
+ * from an object.
+ * <p>
+ * Standard implementations of common transformers are provided by
+ * {@link TransformerUtils}. These include method invocation, returning a constant,
+ * cloning and returning the string value.
+ *
+ * @param <I> the input type to the transformer
+ * @param <O> the output type from the transformer
+ *
+ * @since 1.0
+ * @version $Id: Transformer.java 1543278 2013-11-19 00:54:07Z ggregory $
+ */
+public interface Transformer<I, O> {
+
+    /**
+     * Transforms the input object (leaving it unchanged) into some output object.
+     *
+     * @param input  the object to be transformed, should be left unchanged
+     * @return a transformed object
+     * @throws ClassCastException (runtime) if the input is the wrong class
+     * @throws IllegalArgumentException (runtime) if the input is invalid
+     * @throws FunctorException (runtime) if the transform cannot be completed
+     */
+    O transform(I input);
+
+}

fine-commons-collections4/src/com/fr/third/org/apache/commons/collections4/TransformerUtils.java

@@ -0,0 +1,499 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.fr.third.org.apache.commons.collections4;
+
+import java.util.Collection;
+import java.util.Map;
+
+import com.fr.third.org.apache.commons.collections4.functors.ChainedTransformer;
+import com.fr.third.org.apache.commons.collections4.functors.CloneTransformer;
+import com.fr.third.org.apache.commons.collections4.functors.ClosureTransformer;
+import com.fr.third.org.apache.commons.collections4.functors.ConstantTransformer;
+import com.fr.third.org.apache.commons.collections4.functors.EqualPredicate;
+import com.fr.third.org.apache.commons.collections4.functors.ExceptionTransformer;
+import com.fr.third.org.apache.commons.collections4.functors.FactoryTransformer;
+import com.fr.third.org.apache.commons.collections4.functors.IfTransformer;
+import com.fr.third.org.apache.commons.collections4.functors.InstantiateTransformer;
+import com.fr.third.org.apache.commons.collections4.functors.InvokerTransformer;
+import com.fr.third.org.apache.commons.collections4.functors.MapTransformer;
+import com.fr.third.org.apache.commons.collections4.functors.NOPTransformer;
+import com.fr.third.org.apache.commons.collections4.functors.PredicateTransformer;
+import com.fr.third.org.apache.commons.collections4.functors.StringValueTransformer;
+import com.fr.third.org.apache.commons.collections4.functors.SwitchTransformer;
+import com.fr.third.org.apache.commons.collections4.functors.ChainedTransformer;
+import com.fr.third.org.apache.commons.collections4.functors.CloneTransformer;
+import com.fr.third.org.apache.commons.collections4.functors.ClosureTransformer;
+import com.fr.third.org.apache.commons.collections4.functors.ConstantTransformer;
+import com.fr.third.org.apache.commons.collections4.functors.EqualPredicate;
+import com.fr.third.org.apache.commons.collections4.functors.ExceptionTransformer;
+import com.fr.third.org.apache.commons.collections4.functors.FactoryTransformer;
+import com.fr.third.org.apache.commons.collections4.functors.IfTransformer;
+import com.fr.third.org.apache.commons.collections4.functors.InstantiateTransformer;
+import com.fr.third.org.apache.commons.collections4.functors.InvokerTransformer;
+import com.fr.third.org.apache.commons.collections4.functors.MapTransformer;
+import com.fr.third.org.apache.commons.collections4.functors.NOPTransformer;
+import com.fr.third.org.apache.commons.collections4.functors.PredicateTransformer;
+import com.fr.third.org.apache.commons.collections4.functors.StringValueTransformer;
+import com.fr.third.org.apache.commons.collections4.functors.SwitchTransformer;
+
+/**
+ * <code>TransformerUtils</code> provides reference implementations and
+ * utilities for the Transformer functor interface. The supplied transformers are:
+ * <ul>
+ * <li>Invoker - returns the result of a method call on the input object
+ * <li>Clone - returns a clone of the input object
+ * <li>Constant - always returns the same object
+ * <li>Closure - performs a Closure and returns the input object
+ * <li>Predicate - returns the result of the predicate as a Boolean
+ * <li>Factory - returns a new object from a factory
+ * <li>Chained - chains two or more transformers together
+ * <li>If - calls one transformer or another based on a predicate
+ * <li>Switch - calls one transformer based on one or more predicates
+ * <li>SwitchMap - calls one transformer looked up from a Map
+ * <li>Instantiate - the Class input object is instantiated
+ * <li>Map - returns an object from a supplied Map
+ * <li>Null - always returns null
+ * <li>NOP - returns the input object, which should be immutable
+ * <li>Exception - always throws an exception
+ * <li>StringValue - returns a <code>java.lang.String</code> representation of the input object
+ * </ul>
+ * <p>
+ * Since v4.1 only transformers which are considered to be unsafe are
+ * Serializable. Transformers considered to be unsafe for serialization are:
+ * <ul>
+ * <li>Invoker
+ * <li>Clone
+ * <li>Instantiate
+ * </ul>
+ *
+ * @since 3.0
+ * @version $Id: TransformerUtils.java 1714362 2015-11-14 20:38:02Z tn $
+ */
+public class TransformerUtils {
+
+    /**
+     * This class is not normally instantiated.
+     */
+    private TransformerUtils() {}
+
+    /**
+     * Gets a transformer that always throws an exception.
+     * This could be useful during testing as a placeholder.
+     *
+     * @param <I>  the input type
+     * @param <O>  the output type
+     * @return the transformer
+     * @see ExceptionTransformer
+     */
+    public static <I, O> Transformer<I, O> exceptionTransformer() {
+        return ExceptionTransformer.exceptionTransformer();
+    }
+
+    /**
+     * Gets a transformer that always returns null.
+     *
+     * @param <I>  the input type
+     * @param <O>  the output type
+     * @return the transformer
+     * @see ConstantTransformer
+     */
+    public static <I, O> Transformer<I, O> nullTransformer() {
+        return ConstantTransformer.nullTransformer();
+    }
+
+    /**
+     * Gets a transformer that returns the input object.
+     * The input object should be immutable to maintain the
+     * contract of Transformer (although this is not checked).
+     *
+     * @param <T>  the input/output type
+     * @return the transformer
+     * @see NOPTransformer
+     */
+    public static <T> Transformer<T, T> nopTransformer() {
+        return NOPTransformer.nopTransformer();
+    }
+
+    /**
+     * Gets a transformer that returns a clone of the input object.
+     * The input object will be cloned using one of these techniques (in order):
+     * <ul>
+     * <li>public clone method
+     * <li>public copy constructor
+     * <li>serialization clone
+     * <ul>
+     *
+     * @param <T>  the input/output type
+     * @return the transformer
+     * @see CloneTransformer
+     */
+    public static <T> Transformer<T, T> cloneTransformer() {
+        return CloneTransformer.cloneTransformer();
+    }
+
+    /**
+     * Creates a Transformer that will return the same object each time the
+     * transformer is used.
+     *
+     * @param <I>  the input type
+     * @param <O>  the output type
+     * @param constantToReturn  the constant object to return each time in the transformer
+     * @return the transformer.
+     * @see ConstantTransformer
+     */
+    public static <I, O> Transformer<I, O> constantTransformer(final O constantToReturn) {
+        return ConstantTransformer.constantTransformer(constantToReturn);
+    }
+
+    /**
+     * Creates a Transformer that calls a Closure each time the transformer is used.
+     * The transformer returns the input object.
+     *
+     * @param <T>  the input/output type
+     * @param closure  the closure to run each time in the transformer, not null
+     * @return the transformer
+     * @throws NullPointerException if the closure is null
+     * @see ClosureTransformer
+     */
+    public static <T> Transformer<T, T> asTransformer(final Closure<? super T> closure) {
+        return ClosureTransformer.closureTransformer(closure);
+    }
+
+    /**
+     * Creates a Transformer that calls a Predicate each time the transformer is used.
+     * The transformer will return either Boolean.TRUE or Boolean.FALSE.
+     *
+     * @param <T>  the input type
+     * @param predicate  the predicate to run each time in the transformer, not null
+     * @return the transformer
+     * @throws NullPointerException if the predicate is null
+     * @see PredicateTransformer
+     */
+    public static <T> Transformer<T, Boolean> asTransformer(final Predicate<? super T> predicate) {
+        return PredicateTransformer.predicateTransformer(predicate);
+    }
+
+    /**
+     * Creates a Transformer that calls a Factory each time the transformer is used.
+     * The transformer will return the value returned by the factory.
+     *
+     * @param <I>  the input type
+     * @param <O>  the output type
+     * @param factory  the factory to run each time in the transformer, not null
+     * @return the transformer
+     * @throws NullPointerException if the factory is null
+     * @see FactoryTransformer
+     */
+    public static <I, O> Transformer<I, O> asTransformer(final Factory<? extends O> factory) {
+        return FactoryTransformer.factoryTransformer(factory);
+    }
+
+    /**
+     * Create a new Transformer that calls each transformer in turn, passing the
+     * result into the next transformer.
+     *
+     * @param <T>  the input/output type
+     * @param transformers  an array of transformers to chain
+     * @return the transformer
+     * @throws NullPointerException if the transformers array or any of the transformers is null
+     * @see ChainedTransformer
+     */
+    public static <T> Transformer<T, T> chainedTransformer(
+            final Transformer<? super T, ? extends T>... transformers) {
+        return ChainedTransformer.chainedTransformer(transformers);
+    }
+
+    /**
+     * Create a new Transformer that calls each transformer in turn, passing the
+     * result into the next transformer. The ordering is that of the iterator()
+     * method on the collection.
+     *
+     * @param <T>  the input/output type
+     * @param transformers  a collection of transformers to chain
+     * @return the transformer
+     * @throws NullPointerException if the transformers collection or any of the transformers is null
+     * @see ChainedTransformer
+     */
+    public static <T> Transformer<T, T> chainedTransformer(
+            final Collection<? extends Transformer<? super T, ? extends T>> transformers) {
+        return ChainedTransformer.chainedTransformer(transformers);
+    }
+
+    /**
+     * Create a new Transformer that calls the transformer if the predicate is true,
+     * otherwise the input object is returned unchanged.
+     *
+     * @param <T>  the input / output type
+     * @param predicate  the predicate to switch on
+     * @param trueTransformer  the transformer called if the predicate is true
+     * @return the transformer
+     * @throws NullPointerException if either the predicate or transformer is null
+     * @see IfTransformer
+     * @since 4.1
+     */
+    public static <T> Transformer<T, T> ifTransformer(final Predicate<? super T> predicate,
+                                                      final Transformer<? super T, ? extends T> trueTransformer) {
+        return IfTransformer.ifTransformer(predicate, trueTransformer);
+    }
+
+    /**
+     * Create a new Transformer that calls one of two transformers depending
+     * on the specified predicate.
+     *
+     * @param <I>  the input type
+     * @param <O>  the output type
+     * @param predicate  the predicate to switch on
+     * @param trueTransformer  the transformer called if the predicate is true
+     * @param falseTransformer  the transformer called if the predicate is false
+     * @return the transformer
+     * @throws NullPointerException if either the predicate or transformer is null
+     * @see IfTransformer
+     * @since 4.1
+     */
+    public static <I, O> Transformer<I, O> ifTransformer(final Predicate<? super I> predicate,
+                                                         final Transformer<? super I, ? extends O> trueTransformer,
+                                                         final Transformer<? super I, ? extends O> falseTransformer) {
+        return IfTransformer.ifTransformer(predicate, trueTransformer, falseTransformer);
+    }
+
+    /**
+     * Create a new Transformer that calls one of two transformers depending
+     * on the specified predicate.
+     *
+     * @param <I>  the input type
+     * @param <O>  the output type
+     * @param predicate  the predicate to switch on
+     * @param trueTransformer  the transformer called if the predicate is true
+     * @param falseTransformer  the transformer called if the predicate is false
+     * @return the transformer
+     * @throws NullPointerException if either the predicate or transformer is null
+     * @see SwitchTransformer
+     * @deprecated as of 4.1, use {@link #ifTransformer(Predicate, Transformer, Transformer))
+     */
+    @SuppressWarnings("unchecked")
+    @Deprecated
+    public static <I, O> Transformer<I, O> switchTransformer(final Predicate<? super I> predicate,
+            final Transformer<? super I, ? extends O> trueTransformer,
+            final Transformer<? super I, ? extends O> falseTransformer) {
+        return SwitchTransformer.switchTransformer(new Predicate[] { predicate },
+                                                   new Transformer[] { trueTransformer }, falseTransformer);
+    }
+
+    /**
+     * Create a new Transformer that calls one of the transformers depending
+     * on the predicates. The transformer at array location 0 is called if the
+     * predicate at array location 0 returned true. Each predicate is evaluated
+     * until one returns true. If no predicates evaluate to true, null is returned.
+     *
+     * @param <I>  the input type
+     * @param <O>  the output type
+     * @param predicates  an array of predicates to check
+     * @param transformers  an array of transformers to call
+     * @return the transformer
+     * @throws NullPointerException if the either array is null
+     * @throws NullPointerException if any element in the arrays is null
+     * @throws IllegalArgumentException if the arrays have different sizes
+     * @see SwitchTransformer
+     */
+    public static <I, O> Transformer<I, O> switchTransformer(final Predicate<? super I>[] predicates,
+            final Transformer<? super I, ? extends O>[] transformers) {
+        return SwitchTransformer.switchTransformer(predicates, transformers, null);
+    }
+
+    /**
+     * Create a new Transformer that calls one of the transformers depending
+     * on the predicates. The transformer at array location 0 is called if the
+     * predicate at array location 0 returned true. Each predicate is evaluated
+     * until one returns true. If no predicates evaluate to true, the default
+     * transformer is called. If the default transformer is null, null is returned.
+     *
+     * @param <I>  the input type
+     * @param <O>  the output type
+     * @param predicates  an array of predicates to check
+     * @param transformers  an array of transformers to call
+     * @param defaultTransformer  the default to call if no predicate matches, null means return null
+     * @return the transformer
+     * @throws NullPointerException if the either array is null
+     * @throws NullPointerException if any element in the arrays is null
+     * @throws IllegalArgumentException if the arrays have different sizes
+     * @see SwitchTransformer
+     */
+    public static <I, O> Transformer<I, O> switchTransformer(final Predicate<? super I>[] predicates,
+            final Transformer<? super I, ? extends O>[] transformers,
+            final Transformer<? super I, ? extends O> defaultTransformer) {
+        return SwitchTransformer.switchTransformer(predicates, transformers, defaultTransformer);
+    }
+
+    /**
+     * Create a new Transformer that calls one of the transformers depending
+     * on the predicates.
+     * <p>
+     * The Map consists of Predicate keys and Transformer values. A transformer
+     * is called if its matching predicate returns true. Each predicate is evaluated
+     * until one returns true. If no predicates evaluate to true, the default
+     * transformer is called. The default transformer is set in the map with a
+     * null key. If no default transformer is set, null will be returned in a default
+     * case. The ordering is that of the iterator() method on the entryset collection
+     * of the map.
+     *
+     * @param <I>  the input type
+     * @param <O>  the output type
+     * @param predicatesAndTransformers  a map of predicates to transformers
+     * @return the transformer
+     * @throws NullPointerException if the map is null
+     * @throws NullPointerException if any transformer in the map is null
+     * @throws ClassCastException  if the map elements are of the wrong type
+     * @see SwitchTransformer
+     */
+    public static <I, O> Transformer<I, O> switchTransformer(
+            final Map<Predicate<I>, Transformer<I, O>> predicatesAndTransformers) {
+        return SwitchTransformer.switchTransformer(predicatesAndTransformers);
+    }
+
+    /**
+     * Create a new Transformer that uses the input object as a key to find the
+     * transformer to call.
+     * <p>
+     * The Map consists of object keys and Transformer values. A transformer
+     * is called if the input object equals the key. If there is no match, the
+     * default transformer is called. The default transformer is set in the map
+     * using a null key. If no default is set, null will be returned in a default case.
+     *
+     * @param <I>  the input type
+     * @param <O>  the output type
+     * @param objectsAndTransformers  a map of objects to transformers
+     * @return the transformer
+     * @throws NullPointerException if the map is null
+     * @throws NullPointerException if any transformer in the map is null
+     * @see SwitchTransformer
+     */
+    @SuppressWarnings("unchecked")
+    public static <I, O> Transformer<I, O> switchMapTransformer(
+            final Map<I, Transformer<I, O>> objectsAndTransformers) {
+
+        if (objectsAndTransformers == null) {
+            throw new NullPointerException("The object and transformer map must not be null");
+        }
+        final Transformer<? super I, ? extends O> def = objectsAndTransformers.remove(null);
+        final int size = objectsAndTransformers.size();
+        final Transformer<? super I, ? extends O>[] trs = new Transformer[size];
+        final Predicate<I>[] preds = new Predicate[size];
+        int i = 0;
+        for (final Map.Entry<I, Transformer<I, O>> entry : objectsAndTransformers.entrySet()) {
+            preds[i] = EqualPredicate.<I>equalPredicate(entry.getKey());
+            trs[i++] = entry.getValue();
+        }
+        return TransformerUtils.switchTransformer(preds, trs, def);
+    }
+
+    /**
+     * Gets a Transformer that expects an input Class object that it will instantiate.
+     *
+     * @param <T>  the output type
+     * @return the transformer
+     * @see InstantiateTransformer
+     */
+    public static <T> Transformer<Class<? extends T>, T> instantiateTransformer() {
+        return InstantiateTransformer.instantiateTransformer();
+    }
+
+    /**
+     * Creates a Transformer that expects an input Class object that it will
+     * instantiate. The constructor used is determined by the arguments specified
+     * to this method.
+     *
+     * @param <T>  the output type
+     * @param paramTypes  parameter types for the constructor, can be null
+     * @param args  the arguments to pass to the constructor, can be null
+     * @return the transformer
+     * @throws IllegalArgumentException if the paramTypes and args don't match
+     * @see InstantiateTransformer
+     */
+    public static <T> Transformer<Class<? extends T>, T> instantiateTransformer(
+            final Class<?>[] paramTypes, final Object[] args) {
+        return InstantiateTransformer.instantiateTransformer(paramTypes, args);
+    }
+
+    /**
+     * Creates a Transformer that uses the passed in Map to transform the input
+     * object (as a simple lookup).
+     *
+     * @param <I>  the input type
+     * @param <O>  the output type
+     * @param map  the map to use to transform the objects
+     * @return the transformer, or {@link ConstantTransformer#nullTransformer()} if the
+     *   {@code map} is {@code null}
+     * @see MapTransformer
+     */
+    public static <I, O> Transformer<I, O> mapTransformer(final Map<? super I, ? extends O> map) {
+        return MapTransformer.mapTransformer(map);
+    }
+
+    /**
+     * Gets a Transformer that invokes a method on the input object.
+     * The method must have no parameters. If the input object is null,
+     * null is returned.
+     * <p>
+     * For example, <code>TransformerUtils.invokerTransformer("getName");</code>
+     * will call the <code>getName/code> method on the input object to
+     * determine the transformer result.
+     *
+     * @param <I>  the input type
+     * @param <O>  the output type
+     * @param methodName  the method name to call on the input object, may not be null
+     * @return the transformer
+     * @throws NullPointerException if the methodName is null.
+     * @see InvokerTransformer
+     */
+    public static <I, O> Transformer<I, O> invokerTransformer(final String methodName) {
+        return InvokerTransformer.invokerTransformer(methodName, null, null);
+    }
+
+    /**
+     * Gets a Transformer that invokes a method on the input object.
+     * The method parameters are specified. If the input object is {@code null},
+     * {@code null} is returned.
+     *
+     * @param <I>  the input type
+     * @param <O>  the output type
+     * @param methodName  the name of the method
+     * @param paramTypes  the parameter types
+     * @param args  the arguments
+     * @return the transformer
+     * @throws NullPointerException if the method name is null
+     * @throws IllegalArgumentException if the paramTypes and args don't match
+     * @see InvokerTransformer
+     */
+    public static <I, O> Transformer<I, O> invokerTransformer(final String methodName, final Class<?>[] paramTypes,
+                                                              final Object[] args) {
+        return InvokerTransformer.invokerTransformer(methodName, paramTypes, args);
+    }
+
+    /**
+     * Gets a transformer that returns a <code>java.lang.String</code>
+     * representation of the input object. This is achieved via the
+     * <code>toString</code> method, <code>null</code> returns 'null'.
+     *
+     * @param <T>  the input type
+     * @return the transformer
+     * @see StringValueTransformer
+     */
+    public static <T> Transformer<T, String> stringValueTransformer() {
+        return StringValueTransformer.stringValueTransformer();
+    }
+
+}

fine-commons-collections4/src/com/fr/third/org/apache/commons/collections4/Trie.java

@@ -0,0 +1,47 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.fr.third.org.apache.commons.collections4;
+
+import java.util.SortedMap;
+
+/**
+ * Defines the interface for a prefix tree, an ordered tree data structure. For
+ * more information, see <a href="http://en.wikipedia.org/wiki/Trie">Tries</a>.
+ *
+ * @since 4.0
+ * @version $Id: Trie.java 1543279 2013-11-19 00:54:31Z ggregory $
+ */
+public interface Trie<K, V> extends IterableSortedMap<K, V> {
+
+    /**
+     * Returns a view of this {@link Trie} of all elements that are prefixed
+     * by the given key.
+     * <p>
+     * In a {@link Trie} with fixed size keys, this is essentially a
+     * {@link #get(Object)} operation.
+     * <p>
+     * For example, if the {@link Trie} contains 'Anna', 'Anael',
+     * 'Analu', 'Andreas', 'Andrea', 'Andres', and 'Anatole', then
+     * a lookup of 'And' would return 'Andreas', 'Andrea', and 'Andres'.
+     *
+     * @param key  the key used in the search
+     * @return a {@link SortedMap} view of this {@link Trie} with all elements whose
+     *   key is prefixed by the search key
+     */
+    SortedMap<K, V> prefixMap(K key);
+
+}

fine-commons-collections4/src/com/fr/third/org/apache/commons/collections4/TrieUtils.java

@@ -0,0 +1,50 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.fr.third.org.apache.commons.collections4;
+
+import com.fr.third.org.apache.commons.collections4.trie.UnmodifiableTrie;
+import com.fr.third.org.apache.commons.collections4.trie.UnmodifiableTrie;
+
+/**
+ * A collection of {@link Trie} utilities.
+ *
+ * @since 4.0
+ * @version $Id: TrieUtils.java 1686855 2015-06-22 13:00:27Z tn $
+ */
+public class TrieUtils {
+
+    /**
+     * {@link TrieUtils} should not normally be instantiated.
+     */
+    private TrieUtils() {}
+
+    /**
+     * Returns an unmodifiable instance of a {@link Trie}
+     *
+     * @param <K>  the key type
+     * @param <V>  the value type
+     * @param trie  the trie to make unmodifiable, must not be null
+     * @return an unmodifiable trie backed by the given trie
+     * @throws NullPointerException if trie is null
+     *
+     * @see java.util.Collections#unmodifiableMap(java.util.Map)
+     */
+    public static <K, V> Trie<K, V> unmodifiableTrie(final Trie<K, ? extends V> trie) {
+        return UnmodifiableTrie.unmodifiableTrie(trie);
+    }
+
+}

fine-commons-collections4/src/com/fr/third/org/apache/commons/collections4/Unmodifiable.java

@@ -0,0 +1,38 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.fr.third.org.apache.commons.collections4;
+
+/**
+ * Marker interface for collections, maps and iterators that are unmodifiable.
+ * <p>
+ * This interface enables testing such as:
+ * <pre>
+ * if (coll instanceof Unmodifiable) {
+ *   coll = new ArrayList(coll);
+ * }
+ * // now we know coll is modifiable
+ * </pre>
+ * Of course all this only works if you use the Unmodifiable classes defined
+ * in this library. If you use the JDK unmodifiable class via {@code java.util Collections}
+ * then the interface won't be there.
+ *
+ * @since 3.0
+ * @version $Id: Unmodifiable.java 1477779 2013-04-30 18:55:24Z tn $
+ */
+public interface Unmodifiable {
+    // marker interface - no methods to implement
+}

fine-commons-collections4/src/com/fr/third/org/apache/commons/collections4/bag/AbstractBagDecorator.java

@@ -0,0 +1,98 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.fr.third.org.apache.commons.collections4.bag;
+
+import java.util.Set;
+
+import com.fr.third.org.apache.commons.collections4.Bag;
+import com.fr.third.org.apache.commons.collections4.collection.AbstractCollectionDecorator;
+
+/**
+ * Decorates another <code>Bag</code> to provide additional behaviour.
+ * <p>
+ * Methods are forwarded directly to the decorated bag.
+ *
+ * @since 3.0
+ * @version $Id: AbstractBagDecorator.java 1686855 2015-06-22 13:00:27Z tn $
+ */
+public abstract class AbstractBagDecorator<E>
+        extends AbstractCollectionDecorator<E> implements Bag<E> {
+
+    /** Serialization version */
+    private static final long serialVersionUID = -3768146017343785417L;
+
+    /**
+     * Constructor only used in deserialization, do not use otherwise.
+     * @since 3.1
+     */
+    protected AbstractBagDecorator() {
+        super();
+    }
+
+    /**
+     * Constructor that wraps (not copies).
+     *
+     * @param bag  the bag to decorate, must not be null
+     * @throws NullPointerException if bag is null
+     */
+    protected AbstractBagDecorator(final Bag<E> bag) {
+        super(bag);
+    }
+
+    /**
+     * Gets the bag being decorated.
+     *
+     * @return the decorated bag
+     */
+    @Override
+    protected Bag<E> decorated() {
+        return (Bag<E>) super.decorated();
+    }
+
+    @Override
+    public boolean equals(final Object object) {
+        return object == this || decorated().equals(object);
+    }
+
+    @Override
+    public int hashCode() {
+        return decorated().hashCode();
+    }
+
+    //-----------------------------------------------------------------------
+
+    @Override
+    public int getCount(final Object object) {
+        return decorated().getCount(object);
+    }
+
+    @Override
+    public boolean add(final E object, final int count) {
+        return decorated().add(object, count);
+    }
+
+    @Override
+    public boolean remove(final Object object, final int count) {
+        return decorated().remove(object, count);
+    }
+
+    @Override
+    public Set<E> uniqueSet() {
+        return decorated().uniqueSet();
+    }
+
+}

fine-commons-collections4/src/com/fr/third/org/apache/commons/collections4/bag/AbstractMapBag.java

@@ -0,0 +1,625 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.fr.third.org.apache.commons.collections4.bag;
+
+import java.io.IOException;
+import java.io.ObjectInputStream;
+import java.io.ObjectOutputStream;
+import java.lang.reflect.Array;
+import java.util.Collection;
+import java.util.ConcurrentModificationException;
+import java.util.Iterator;
+import java.util.Map;
+import java.util.Map.Entry;
+import java.util.Set;
+
+import com.fr.third.org.apache.commons.collections4.set.UnmodifiableSet;
+import com.fr.third.org.apache.commons.collections4.Bag;
+import com.fr.third.org.apache.commons.collections4.set.UnmodifiableSet;
+
+/**
+ * Abstract implementation of the {@link Bag} interface to simplify the creation
+ * of subclass implementations.
+ * <p>
+ * Subclasses specify a Map implementation to use as the internal storage. The
+ * map will be used to map bag elements to a number; the number represents the
+ * number of occurrences of that element in the bag.
+ *
+ * @since 3.0 (previously DefaultMapBag v2.0)
+ * @version $Id: AbstractMapBag.java 1684859 2015-06-11 11:57:24Z tn $
+ */
+public abstract class AbstractMapBag<E> implements Bag<E> {
+
+    /** The map to use to store the data */
+    private transient Map<E, MutableInteger> map;
+    /** The current total size of the bag */
+    private int size;
+    /** The modification count for fail fast iterators */
+    private transient int modCount;
+    /** Unique view of the elements */
+    private transient Set<E> uniqueSet;
+
+    /**
+     * Constructor needed for subclass serialisation.
+     */
+    protected AbstractMapBag() {
+        super();
+    }
+
+    /**
+     * Constructor that assigns the specified Map as the backing store. The map
+     * must be empty and non-null.
+     *
+     * @param map the map to assign
+     */
+    protected AbstractMapBag(final Map<E, MutableInteger> map) {
+        super();
+        this.map = map;
+    }
+
+    /**
+     * Utility method for implementations to access the map that backs this bag.
+     * Not intended for interactive use outside of subclasses.
+     *
+     * @return the map being used by the Bag
+     */
+    protected Map<E, MutableInteger> getMap() {
+        return map;
+    }
+
+    //-----------------------------------------------------------------------
+    /**
+     * Returns the number of elements in this bag.
+     *
+     * @return current size of the bag
+     */
+    @Override
+    public int size() {
+        return size;
+    }
+
+    /**
+     * Returns true if the underlying map is empty.
+     *
+     * @return true if bag is empty
+     */
+    @Override
+    public boolean isEmpty() {
+        return map.isEmpty();
+    }
+
+    /**
+     * Returns the number of occurrence of the given element in this bag by
+     * looking up its count in the underlying map.
+     *
+     * @param object the object to search for
+     * @return the number of occurrences of the object, zero if not found
+     */
+    @Override
+    public int getCount(final Object object) {
+        final MutableInteger count = map.get(object);
+        if (count != null) {
+            return count.value;
+        }
+        return 0;
+    }
+
+    //-----------------------------------------------------------------------
+    /**
+     * Determines if the bag contains the given element by checking if the
+     * underlying map contains the element as a key.
+     *
+     * @param object the object to search for
+     * @return true if the bag contains the given element
+     */
+    @Override
+    public boolean contains(final Object object) {
+        return map.containsKey(object);
+    }
+
+    /**
+     * Determines if the bag contains the given elements.
+     *
+     * @param coll the collection to check against
+     * @return <code>true</code> if the Bag contains all the collection
+     */
+    @Override
+    public boolean containsAll(final Collection<?> coll) {
+        if (coll instanceof Bag) {
+            return containsAll((Bag<?>) coll);
+        }
+        return containsAll(new HashBag<Object>(coll));
+    }
+
+    /**
+     * Returns <code>true</code> if the bag contains all elements in the given
+     * collection, respecting cardinality.
+     *
+     * @param other the bag to check against
+     * @return <code>true</code> if the Bag contains all the collection
+     */
+    boolean containsAll(final Bag<?> other) {
+        final Iterator<?> it = other.uniqueSet().iterator();
+        while (it.hasNext()) {
+            final Object current = it.next();
+            if (getCount(current) < other.getCount(current)) {
+                return false;
+            }
+        }
+        return true;
+    }
+
+    //-----------------------------------------------------------------------
+    /**
+     * Gets an iterator over the bag elements. Elements present in the Bag more
+     * than once will be returned repeatedly.
+     *
+     * @return the iterator
+     */
+    @Override
+    public Iterator<E> iterator() {
+        return new BagIterator<E>(this);
+    }
+
+    /**
+     * Inner class iterator for the Bag.
+     */
+    static class BagIterator<E> implements Iterator<E> {
+        private final AbstractMapBag<E> parent;
+        private final Iterator<Map.Entry<E, MutableInteger>> entryIterator;
+        private Map.Entry<E, MutableInteger> current;
+        private int itemCount;
+        private final int mods;
+        private boolean canRemove;
+
+        /**
+         * Constructor.
+         *
+         * @param parent the parent bag
+         */
+        public BagIterator(final AbstractMapBag<E> parent) {
+            this.parent = parent;
+            this.entryIterator = parent.map.entrySet().iterator();
+            this.current = null;
+            this.mods = parent.modCount;
+            this.canRemove = false;
+        }
+
+        /** {@inheritDoc} */
+        @Override
+        public boolean hasNext() {
+            return itemCount > 0 || entryIterator.hasNext();
+        }
+
+        /** {@inheritDoc} */
+        @Override
+        public E next() {
+            if (parent.modCount != mods) {
+                throw new ConcurrentModificationException();
+            }
+            if (itemCount == 0) {
+                current = entryIterator.next();
+                itemCount = current.getValue().value;
+            }
+            canRemove = true;
+            itemCount--;
+            return current.getKey();
+        }
+
+        /** {@inheritDoc} */
+        @Override
+        public void remove() {
+            if (parent.modCount != mods) {
+                throw new ConcurrentModificationException();
+            }
+            if (canRemove == false) {
+                throw new IllegalStateException();
+            }
+            final MutableInteger mut = current.getValue();
+            if (mut.value > 1) {
+                mut.value--;
+            } else {
+                entryIterator.remove();
+            }
+            parent.size--;
+            canRemove = false;
+        }
+    }
+
+    //-----------------------------------------------------------------------
+    /**
+     * Adds a new element to the bag, incrementing its count in the underlying map.
+     *
+     * @param object the object to add
+     * @return <code>true</code> if the object was not already in the <code>uniqueSet</code>
+     */
+    @Override
+    public boolean add(final E object) {
+        return add(object, 1);
+    }
+
+    /**
+     * Adds a new element to the bag, incrementing its count in the map.
+     *
+     * @param object the object to search for
+     * @param nCopies the number of copies to add
+     * @return <code>true</code> if the object was not already in the <code>uniqueSet</code>
+     */
+    @Override
+    public boolean add(final E object, final int nCopies) {
+        modCount++;
+        if (nCopies > 0) {
+            final MutableInteger mut = map.get(object);
+            size += nCopies;
+            if (mut == null) {
+                map.put(object, new MutableInteger(nCopies));
+                return true;
+            }
+            mut.value += nCopies;
+            return false;
+        }
+        return false;
+    }
+
+    /**
+     * Invokes {@link #add(Object)} for each element in the given collection.
+     *
+     * @param coll the collection to add
+     * @return <code>true</code> if this call changed the bag
+     */
+    @Override
+    public boolean addAll(final Collection<? extends E> coll) {
+        boolean changed = false;
+        final Iterator<? extends E> i = coll.iterator();
+        while (i.hasNext()) {
+            final boolean added = add(i.next());
+            changed = changed || added;
+        }
+        return changed;
+    }
+
+    //-----------------------------------------------------------------------
+    /**
+     * Clears the bag by clearing the underlying map.
+     */
+    @Override
+    public void clear() {
+        modCount++;
+        map.clear();
+        size = 0;
+    }
+
+    /**
+     * Removes all copies of the specified object from the bag.
+     *
+     * @param object the object to remove
+     * @return true if the bag changed
+     */
+    @Override
+    public boolean remove(final Object object) {
+        final MutableInteger mut = map.get(object);
+        if (mut == null) {
+            return false;
+        }
+        modCount++;
+        map.remove(object);
+        size -= mut.value;
+        return true;
+    }
+
+    /**
+     * Removes a specified number of copies of an object from the bag.
+     *
+     * @param object the object to remove
+     * @param nCopies the number of copies to remove
+     * @return true if the bag changed
+     */
+    @Override
+    public boolean remove(final Object object, final int nCopies) {
+        final MutableInteger mut = map.get(object);
+        if (mut == null) {
+            return false;
+        }
+        if (nCopies <= 0) {
+            return false;
+        }
+        modCount++;
+        if (nCopies < mut.value) {
+            mut.value -= nCopies;
+            size -= nCopies;
+        } else {
+            map.remove(object);
+            size -= mut.value;
+        }
+        return true;
+    }
+
+    /**
+     * Removes objects from the bag according to their count in the specified
+     * collection.
+     *
+     * @param coll the collection to use
+     * @return true if the bag changed
+     */
+    @Override
+    public boolean removeAll(final Collection<?> coll) {
+        boolean result = false;
+        if (coll != null) {
+            final Iterator<?> i = coll.iterator();
+            while (i.hasNext()) {
+                final boolean changed = remove(i.next(), 1);
+                result = result || changed;
+            }
+        }
+        return result;
+    }
+
+    /**
+     * Remove any members of the bag that are not in the given bag, respecting
+     * cardinality.
+     *
+     * @param coll the collection to retain
+     * @return true if this call changed the collection
+     */
+    @Override
+    public boolean retainAll(final Collection<?> coll) {
+        if (coll instanceof Bag) {
+            return retainAll((Bag<?>) coll);
+        }
+        return retainAll(new HashBag<Object>(coll));
+    }
+
+    /**
+     * Remove any members of the bag that are not in the given bag, respecting
+     * cardinality.
+     * @see #retainAll(Collection)
+     *
+     * @param other the bag to retain
+     * @return <code>true</code> if this call changed the collection
+     */
+    boolean retainAll(final Bag<?> other) {
+        boolean result = false;
+        final Bag<E> excess = new HashBag<E>();
+        final Iterator<E> i = uniqueSet().iterator();
+        while (i.hasNext()) {
+            final E current = i.next();
+            final int myCount = getCount(current);
+            final int otherCount = other.getCount(current);
+            if (1 <= otherCount && otherCount <= myCount) {
+                excess.add(current, myCount - otherCount);
+            } else {
+                excess.add(current, myCount);
+            }
+        }
+        if (!excess.isEmpty()) {
+            result = removeAll(excess);
+        }
+        return result;
+    }
+
+    //-----------------------------------------------------------------------
+    /**
+     * Mutable integer class for storing the data.
+     */
+    protected static class MutableInteger {
+        /** The value of this mutable. */
+        protected int value;
+
+        /**
+         * Constructor.
+         * @param value the initial value
+         */
+        MutableInteger(final int value) {
+            this.value = value;
+        }
+
+        @Override
+        public boolean equals(final Object obj) {
+            if (obj instanceof MutableInteger == false) {
+                return false;
+            }
+            return ((MutableInteger) obj).value == value;
+        }
+
+        @Override
+        public int hashCode() {
+            return value;
+        }
+    }
+
+    //-----------------------------------------------------------------------
+    /**
+     * Returns an array of all of this bag's elements.
+     *
+     * @return an array of all of this bag's elements
+     */
+    @Override
+    public Object[] toArray() {
+        final Object[] result = new Object[size()];
+        int i = 0;
+        final Iterator<E> it = map.keySet().iterator();
+        while (it.hasNext()) {
+            final E current = it.next();
+            for (int index = getCount(current); index > 0; index--) {
+                result[i++] = current;
+            }
+        }
+        return result;
+    }
+
+    /**
+     * Returns an array of all of this bag's elements.
+     * If the input array has more elements than are in the bag,
+     * trailing elements will be set to null.
+     *
+     * @param <T> the type of the array elements
+     * @param array the array to populate
+     * @return an array of all of this bag's elements
+     * @throws ArrayStoreException if the runtime type of the specified array is not
+     *   a supertype of the runtime type of the elements in this list
+     * @throws NullPointerException if the specified array is null
+     */
+    @Override
+    public <T> T[] toArray(T[] array) {
+        final int size = size();
+        if (array.length < size) {
+            @SuppressWarnings("unchecked") // safe as both are of type T
+            final T[] unchecked = (T[]) Array.newInstance(array.getClass().getComponentType(), size);
+            array = unchecked;
+        }
+
+        int i = 0;
+        final Iterator<E> it = map.keySet().iterator();
+        while (it.hasNext()) {
+            final E current = it.next();
+            for (int index = getCount(current); index > 0; index--) {
+                // unsafe, will throw ArrayStoreException if types are not compatible, see javadoc
+                @SuppressWarnings("unchecked")
+                final T unchecked = (T) current;
+                array[i++] = unchecked;
+            }
+        }
+        while (i < array.length) {
+            array[i++] = null;
+        }
+        return array;
+    }
+
+    /**
+     * Returns an unmodifiable view of the underlying map's key set.
+     *
+     * @return the set of unique elements in this bag
+     */
+    @Override
+    public Set<E> uniqueSet() {
+        if (uniqueSet == null) {
+            uniqueSet = UnmodifiableSet.<E> unmodifiableSet(map.keySet());
+        }
+        return uniqueSet;
+    }
+
+    //-----------------------------------------------------------------------
+    /**
+     * Write the map out using a custom routine.
+     * @param out the output stream
+     * @throws IOException any of the usual I/O related exceptions
+     */
+    protected void doWriteObject(final ObjectOutputStream out) throws IOException {
+        out.writeInt(map.size());
+        for (final Entry<E, MutableInteger> entry : map.entrySet()) {
+            out.writeObject(entry.getKey());
+            out.writeInt(entry.getValue().value);
+        }
+    }
+
+    /**
+     * Read the map in using a custom routine.
+     * @param map the map to use
+     * @param in the input stream
+     * @throws IOException any of the usual I/O related exceptions
+     * @throws ClassNotFoundException if the stream contains an object which class can not be loaded
+     * @throws ClassCastException if the stream does not contain the correct objects
+     */
+    protected void doReadObject(final Map<E, MutableInteger> map, final ObjectInputStream in)
+            throws IOException, ClassNotFoundException {
+        this.map = map;
+        final int entrySize = in.readInt();
+        for (int i = 0; i < entrySize; i++) {
+            @SuppressWarnings("unchecked") // This will fail at runtime if the stream is incorrect
+            final E obj = (E) in.readObject();
+            final int count = in.readInt();
+            map.put(obj, new MutableInteger(count));
+            size += count;
+        }
+    }
+
+    //-----------------------------------------------------------------------
+    /**
+     * Compares this Bag to another. This Bag equals another Bag if it contains
+     * the same number of occurrences of the same elements.
+     *
+     * @param object the Bag to compare to
+     * @return true if equal
+     */
+    @Override
+    public boolean equals(final Object object) {
+        if (object == this) {
+            return true;
+        }
+        if (object instanceof Bag == false) {
+            return false;
+        }
+        final Bag<?> other = (Bag<?>) object;
+        if (other.size() != size()) {
+            return false;
+        }
+        for (final E element : map.keySet()) {
+            if (other.getCount(element) != getCount(element)) {
+                return false;
+            }
+        }
+        return true;
+    }
+
+    /**
+     * Gets a hash code for the Bag compatible with the definition of equals.
+     * The hash code is defined as the sum total of a hash code for each
+     * element. The per element hash code is defined as
+     * <code>(e==null ? 0 : e.hashCode()) ^ noOccurances)</code>. This hash code
+     * is compatible with the Set interface.
+     *
+     * @return the hash code of the Bag
+     */
+    @Override
+    public int hashCode() {
+        int total = 0;
+        for (final Entry<E, MutableInteger> entry : map.entrySet()) {
+            final E element = entry.getKey();
+            final MutableInteger count = entry.getValue();
+            total += (element == null ? 0 : element.hashCode()) ^ count.value;
+        }
+        return total;
+    }
+
+    /**
+     * Implement a toString() method suitable for debugging.
+     *
+     * @return a debugging toString
+     */
+    @Override
+    public String toString() {
+        if (size() == 0) {
+            return "[]";
+        }
+        final StringBuilder buf = new StringBuilder();
+        buf.append('[');
+        final Iterator<E> it = uniqueSet().iterator();
+        while (it.hasNext()) {
+            final Object current = it.next();
+            final int count = getCount(current);
+            buf.append(count);
+            buf.append(':');
+            buf.append(current);
+            if (it.hasNext()) {
+                buf.append(',');
+            }
+        }
+        buf.append(']');
+        return buf.toString();
+    }
+
+}

fine-commons-collections4/src/com/fr/third/org/apache/commons/collections4/bag/AbstractSortedBagDecorator.java

@@ -0,0 +1,82 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.fr.third.org.apache.commons.collections4.bag;
+
+import java.util.Comparator;
+
+import com.fr.third.org.apache.commons.collections4.SortedBag;
+
+/**
+ * Decorates another <code>SortedBag</code> to provide additional behaviour.
+ * <p>
+ * Methods are forwarded directly to the decorated bag.
+ *
+ * @since 3.0
+ * @version $Id: AbstractSortedBagDecorator.java 1686855 2015-06-22 13:00:27Z tn $
+ */
+public abstract class AbstractSortedBagDecorator<E>
+        extends AbstractBagDecorator<E> implements SortedBag<E> {
+
+    /** Serialization version */
+    private static final long serialVersionUID = -8223473624050467718L;
+
+    /**
+     * Constructor only used in deserialization, do not use otherwise.
+     * @since 3.1
+     */
+    protected AbstractSortedBagDecorator() {
+        super();
+    }
+
+    /**
+     * Constructor that wraps (not copies).
+     *
+     * @param bag  the bag to decorate, must not be null
+     * @throws NullPointerException if bag is null
+     */
+    protected AbstractSortedBagDecorator(final SortedBag<E> bag) {
+        super(bag);
+    }
+
+    /**
+     * Gets the bag being decorated.
+     *
+     * @return the decorated bag
+     */
+    @Override
+    protected SortedBag<E> decorated() {
+        return (SortedBag<E>) super.decorated();
+    }
+
+    //-----------------------------------------------------------------------
+
+    @Override
+    public E first() {
+        return decorated().first();
+    }
+
+    @Override
+    public E last() {
+        return decorated().last();
+    }
+
+    @Override
+    public Comparator<? super E> comparator() {
+        return decorated().comparator();
+    }
+
+}

fine-commons-collections4/src/com/fr/third/org/apache/commons/collections4/bag/CollectionBag.java

@@ -0,0 +1,243 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.fr.third.org.apache.commons.collections4.bag;
+
+import java.io.IOException;
+import java.io.ObjectInputStream;
+import java.io.ObjectOutputStream;
+import java.util.Collection;
+import java.util.Iterator;
+
+import com.fr.third.org.apache.commons.collections4.Bag;
+
+/**
+ * Decorates another {@link Bag} to comply with the Collection contract.
+ * <p>
+ * By decorating an existing {@link Bag} instance with a {@link CollectionBag},
+ * it can be safely passed on to methods that require Collection types that
+ * are fully compliant with the Collection contract.
+ * <p>
+ * The method javadoc highlights the differences compared to the original Bag interface.
+ *
+ * @see Bag
+ * @param <E> the type held in the bag
+ * @since 4.0
+ * @version $Id: CollectionBag.java 1686855 2015-06-22 13:00:27Z tn $
+ */
+public final class CollectionBag<E> extends AbstractBagDecorator<E> {
+
+    /** Serialization version */
+    private static final long serialVersionUID = -2560033712679053143L;
+
+    /**
+     * Factory method to create a bag that complies to the Collection contract.
+     *
+     * @param <E> the type of the elements in the bag
+     * @param bag  the bag to decorate, must not be null
+     * @return a Bag that complies to the Collection contract
+     * @throws NullPointerException if bag is null
+     */
+    public static <E> Bag<E> collectionBag(final Bag<E> bag) {
+        return new CollectionBag<E>(bag);
+    }
+
+    //-----------------------------------------------------------------------
+    /**
+     * Constructor that wraps (not copies).
+     *
+     * @param bag  the bag to decorate, must not be null
+     * @throws NullPointerException if bag is null
+     */
+    public CollectionBag(final Bag<E> bag) {
+        super(bag);
+    }
+
+    //-----------------------------------------------------------------------
+    /**
+     * Write the collection out using a custom routine.
+     *
+     * @param out  the output stream
+     * @throws IOException
+     */
+    private void writeObject(final ObjectOutputStream out) throws IOException {
+        out.defaultWriteObject();
+        out.writeObject(decorated());
+    }
+
+    /**
+     * Read the collection in using a custom routine.
+     *
+     * @param in  the input stream
+     * @throws IOException
+     * @throws ClassNotFoundException
+     * @throws ClassCastException if deserialised object has wrong type
+     */
+    @SuppressWarnings("unchecked") // will throw CCE, see Javadoc
+    private void readObject(final ObjectInputStream in) throws IOException, ClassNotFoundException {
+        in.defaultReadObject();
+        setCollection((Collection<E>) in.readObject());
+    }
+
+    //-----------------------------------------------------------------------
+    // Collection interface
+    //-----------------------------------------------------------------------
+
+    /**
+     * <i>(Change)</i>
+     * Returns <code>true</code> if the bag contains all elements in
+     * the given collection, <b>not</b> respecting cardinality. That is,
+     * if the given collection <code>coll</code> contains at least one of
+     * every object contained in this object.
+     *
+     * @param coll  the collection to check against
+     * @return <code>true</code> if the Bag contains at least one of every object in the collection
+     */
+    @Override
+    public boolean containsAll(final Collection<?> coll) {
+        final Iterator<?> e = coll.iterator();
+        while (e.hasNext()) {
+            if(!contains(e.next())) {
+                return false;
+            }
+        }
+        return true;
+    }
+
+    /**
+     * <i>(Change)</i>
+     * Adds one copy of the specified object to the Bag.
+     * <p>
+     * Since this method always increases the size of the bag, it
+     * will always return <code>true</code>.
+     *
+     * @param object  the object to add
+     * @return <code>true</code>, always
+     */
+    @Override
+    public boolean add(final E object) {
+        return add(object, 1);
+    }
+
+    @Override
+    public boolean addAll(final Collection<? extends E> coll) {
+        boolean changed = false;
+        final Iterator<? extends E> i = coll.iterator();
+        while (i.hasNext()) {
+            final boolean added = add(i.next(), 1);
+            changed = changed || added;
+        }
+        return changed;
+    }
+
+    /**
+     * <i>(Change)</i>
+     * Removes the first occurrence of the given object from the bag.
+     * <p>
+     * This will also remove the object from the {@link #uniqueSet()} if the
+     * bag contains no occurrence anymore of the object after this operation.
+     *
+     * @param object  the object to remove
+     * @return <code>true</code> if this call changed the collection
+     */
+    @Override
+    public boolean remove(final Object object) {
+        return remove(object, 1);
+    }
+
+    /**
+     * <i>(Change)</i>
+     * Remove all elements represented in the given collection,
+     * <b>not</b> respecting cardinality. That is, remove <i>all</i>
+     * occurrences of every object contained in the given collection.
+     *
+     * @param coll  the collection to remove
+     * @return <code>true</code> if this call changed the collection
+     */
+    @Override
+    public boolean removeAll(final Collection<?> coll) {
+        if (coll != null) {
+            boolean result = false;
+            final Iterator<?> i = coll.iterator();
+            while (i.hasNext()) {
+                final Object obj = i.next();
+                final boolean changed = remove(obj, getCount(obj));
+                result = result || changed;
+            }
+            return result;
+        } else {
+            // let the decorated bag handle the case of null argument
+            return decorated().removeAll(null);
+        }
+    }
+
+    /**
+     * <i>(Change)</i>
+     * Remove any members of the bag that are not in the given collection,
+     * <i>not</i> respecting cardinality. That is, any object in the given
+     * collection <code>coll</code> will be retained in the bag with the same
+     * number of copies prior to this operation. All other objects will be
+     * completely removed from this bag.
+     * <p>
+     * This implementation iterates over the elements of this bag, checking
+     * each element in turn to see if it's contained in <code>coll</code>.
+     * If it's not contained, it's removed from this bag. As a consequence,
+     * it is advised to use a collection type for <code>coll</code> that provides
+     * a fast (e.g. O(1)) implementation of {@link Collection#contains(Object)}.
+     *
+     * @param coll  the collection to retain
+     * @return <code>true</code> if this call changed the collection
+     */
+    @Override
+    public boolean retainAll(final Collection<?> coll) {
+        if (coll != null) {
+            boolean modified = false;
+            final Iterator<E> e = iterator();
+            while (e.hasNext()) {
+                if (!coll.contains(e.next())) {
+                    e.remove();
+                    modified = true;
+                }
+            }
+            return modified;
+        } else {
+            // let the decorated bag handle the case of null argument
+            return decorated().retainAll(null);
+        }
+    }
+
+    //-----------------------------------------------------------------------
+    // Bag interface
+    //-----------------------------------------------------------------------
+
+    /**
+     * <i>(Change)</i>
+     * Adds <code>count</code> copies of the specified object to the Bag.
+     * <p>
+     * Since this method always increases the size of the bag, it
+     * will always return <code>true</code>.
+     *
+     * @param object  the object to add
+     * @param count  the number of copies to add
+     * @return <code>true</code>, always
+     */
+    @Override
+    public boolean add(final E object, final int count) {
+        decorated().add(object, count);
+        return true;
+    }
+
+}

fine-commons-collections4/src/com/fr/third/org/apache/commons/collections4/bag/CollectionSortedBag.java

@@ -0,0 +1,168 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.fr.third.org.apache.commons.collections4.bag;
+
+import java.io.IOException;
+import java.io.ObjectInputStream;
+import java.io.ObjectOutputStream;
+import java.util.Collection;
+import java.util.Iterator;
+
+import com.fr.third.org.apache.commons.collections4.SortedBag;
+
+/**
+ * Decorates another {@link SortedBag} to comply with the Collection contract.
+ *
+ * @since 4.0
+ * @version $Id: CollectionSortedBag.java 1686855 2015-06-22 13:00:27Z tn $
+ */
+public final class CollectionSortedBag<E> extends AbstractSortedBagDecorator<E> {
+
+    /** Serialization version */
+    private static final long serialVersionUID = -2560033712679053143L;
+
+    /**
+     * Factory method to create a sorted bag that complies to the Collection contract.
+     *
+     * @param <E> the type of the elements in the bag
+     * @param bag  the sorted bag to decorate, must not be null
+     * @return a SortedBag that complies to the Collection contract
+     * @throws NullPointerException if bag is null
+     */
+    public static <E> SortedBag<E> collectionSortedBag(final SortedBag<E> bag) {
+        return new CollectionSortedBag<E>(bag);
+    }
+
+    //-----------------------------------------------------------------------
+    /**
+     * Constructor that wraps (not copies).
+     *
+     * @param bag  the sorted bag to decorate, must not be null
+     * @throws NullPointerException if bag is null
+     */
+    public CollectionSortedBag(final SortedBag<E> bag) {
+        super(bag);
+    }
+
+    //-----------------------------------------------------------------------
+    /**
+     * Write the collection out using a custom routine.
+     *
+     * @param out  the output stream
+     * @throws IOException
+     */
+    private void writeObject(final ObjectOutputStream out) throws IOException {
+        out.defaultWriteObject();
+        out.writeObject(decorated());
+    }
+
+    /**
+     * Read the collection in using a custom routine.
+     *
+     * @param in  the input stream
+     * @throws IOException
+     * @throws ClassNotFoundException
+     * @throws ClassCastException if deserialised object has wrong type
+     */
+    @SuppressWarnings("unchecked") // will throw CCE, see Javadoc
+    private void readObject(final ObjectInputStream in) throws IOException, ClassNotFoundException {
+        in.defaultReadObject();
+        setCollection((Collection<E>) in.readObject());
+    }
+
+    //-----------------------------------------------------------------------
+    // Collection interface
+    //-----------------------------------------------------------------------
+
+    @Override
+    public boolean containsAll(final Collection<?> coll) {
+        final Iterator<?> e = coll.iterator();
+        while (e.hasNext()) {
+            if(!contains(e.next())) {
+                return false;
+            }
+        }
+        return true;
+    }
+
+    @Override
+    public boolean add(final E object) {
+        return add(object, 1);
+    }
+
+    @Override
+    public boolean addAll(final Collection<? extends E> coll) {
+        boolean changed = false;
+        final Iterator<? extends E> i = coll.iterator();
+        while (i.hasNext()) {
+            final boolean added = add(i.next(), 1);
+            changed = changed || added;
+        }
+        return changed;
+    }
+
+    @Override
+    public boolean remove(final Object object) {
+        return remove(object, 1);
+    }
+
+    @Override
+    public boolean removeAll(final Collection<?> coll) {
+        if (coll != null) {
+            boolean result = false;
+            final Iterator<?> i = coll.iterator();
+            while (i.hasNext()) {
+                final Object obj = i.next();
+                final boolean changed = remove(obj, getCount(obj));
+                result = result || changed;
+            }
+            return result;
+        } else {
+            // let the decorated bag handle the case of null argument
+            return decorated().removeAll(null);
+        }
+    }
+
+    @Override
+    public boolean retainAll(final Collection<?> coll) {
+        if (coll != null) {
+            boolean modified = false;
+            final Iterator<E> e = iterator();
+            while (e.hasNext()) {
+                if (!coll.contains(e.next())) {
+                    e.remove();
+                    modified = true;
+                }
+            }
+            return modified;
+        } else {
+            // let the decorated bag handle the case of null argument
+            return decorated().retainAll(null);
+        }
+    }
+
+    //-----------------------------------------------------------------------
+    // Bag interface
+    //-----------------------------------------------------------------------
+
+    @Override
+    public boolean add(final E object, final int count) {
+        decorated().add(object, count);
+        return true;
+    }
+
+}

fine-commons-collections4/src/com/fr/third/org/apache/commons/collections4/bag/HashBag.java

@@ -0,0 +1,78 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.fr.third.org.apache.commons.collections4.bag;
+
+import java.io.IOException;
+import java.io.ObjectInputStream;
+import java.io.ObjectOutputStream;
+import java.io.Serializable;
+import java.util.Collection;
+import java.util.HashMap;
+
+/**
+ * Implements {@code Bag}, using a {@link HashMap} to provide the
+ * data storage. This is the standard implementation of a bag.
+ * <p>
+ * A {@code Bag} stores each object in the collection together with a
+ * count of occurrences. Extra methods on the interface allow multiple copies
+ * of an object to be added or removed at once. It is important to read the
+ * interface javadoc carefully as several methods violate the
+ * {@link Collection} interface specification.
+ *
+ * @since 3.0 (previously in main package v2.0)
+ * @version $Id: HashBag.java 1685902 2015-06-16 20:13:13Z tn $
+ */
+public class HashBag<E> extends AbstractMapBag<E> implements Serializable {
+
+    /** Serial version lock */
+    private static final long serialVersionUID = -6561115435802554013L;
+
+    /**
+     * Constructs an empty {@link HashBag}.
+     */
+    public HashBag() {
+        super(new HashMap<E, MutableInteger>());
+    }
+
+    /**
+     * Constructs a bag containing all the members of the given collection.
+     *
+     * @param coll  a collection to copy into this bag
+     */
+    public HashBag(final Collection<? extends E> coll) {
+        this();
+        addAll(coll);
+    }
+
+    //-----------------------------------------------------------------------
+    /**
+     * Write the bag out using a custom routine.
+     */
+    private void writeObject(final ObjectOutputStream out) throws IOException {
+        out.defaultWriteObject();
+        super.doWriteObject(out);
+    }
+
+    /**
+     * Read the bag in using a custom routine.
+     */
+    private void readObject(final ObjectInputStream in) throws IOException, ClassNotFoundException {
+        in.defaultReadObject();
+        super.doReadObject(new HashMap<E, MutableInteger>(), in);
+    }
+
+}

fine-commons-collections4/src/com/fr/third/org/apache/commons/collections4/bag/PredicatedBag.java

@@ -0,0 +1,126 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.fr.third.org.apache.commons.collections4.bag;
+
+import java.util.Set;
+
+import com.fr.third.org.apache.commons.collections4.Predicate;
+import com.fr.third.org.apache.commons.collections4.Bag;
+import com.fr.third.org.apache.commons.collections4.Predicate;
+import com.fr.third.org.apache.commons.collections4.collection.PredicatedCollection;
+
+/**
+ * Decorates another {@link Bag} to validate that additions
+ * match a specified predicate.
+ * <p>
+ * This bag exists to provide validation for the decorated bag.
+ * It is normally created to decorate an empty bag.
+ * If an object cannot be added to the bag, an {@link IllegalArgumentException} is thrown.
+ * <p>
+ * One usage would be to ensure that no null entries are added to the bag.
+ * <pre>
+ * Bag bag = PredicatedBag.predicatedBag(new HashBag(), NotNullPredicate.INSTANCE);
+ * </pre>
+ * <p>
+ * This class is Serializable from Commons Collections 3.1.
+ *
+ * @since 3.0
+ * @version $Id: PredicatedBag.java 1686855 2015-06-22 13:00:27Z tn $
+ */
+public class PredicatedBag<E> extends PredicatedCollection<E> implements Bag<E> {
+
+    /** Serialization version */
+    private static final long serialVersionUID = -2575833140344736876L;
+
+    /**
+     * Factory method to create a predicated (validating) bag.
+     * <p>
+     * If there are any elements already in the bag being decorated, they
+     * are validated.
+     *
+     * @param <E> the type of the elements in the bag
+     * @param bag  the bag to decorate, must not be null
+     * @param predicate  the predicate to use for validation, must not be null
+     * @return a new predicated Bag
+     * @throws NullPointerException if bag or predicate is null
+     * @throws IllegalArgumentException if the bag contains invalid elements
+     * @since 4.0
+     */
+    public static <E> PredicatedBag<E> predicatedBag(final Bag<E> bag, final Predicate<? super E> predicate) {
+        return new PredicatedBag<E>(bag, predicate);
+    }
+
+    //-----------------------------------------------------------------------
+    /**
+     * Constructor that wraps (not copies).
+     * <p>
+     * If there are any elements already in the bag being decorated, they
+     * are validated.
+     *
+     * @param bag  the bag to decorate, must not be null
+     * @param predicate  the predicate to use for validation, must not be null
+     * @throws NullPointerException if bag or predicate is null
+     * @throws IllegalArgumentException if the bag contains invalid elements
+     */
+    protected PredicatedBag(final Bag<E> bag, final Predicate<? super E> predicate) {
+        super(bag, predicate);
+    }
+
+    /**
+     * Gets the decorated bag.
+     *
+     * @return the decorated bag
+     */
+    @Override
+    protected Bag<E> decorated() {
+        return (Bag<E>) super.decorated();
+    }
+
+    @Override
+    public boolean equals(final Object object) {
+        return object == this || decorated().equals(object);
+    }
+
+    @Override
+    public int hashCode() {
+        return decorated().hashCode();
+    }
+
+    //-----------------------------------------------------------------------
+
+    @Override
+    public boolean add(final E object, final int count) {
+        validate(object);
+        return decorated().add(object, count);
+    }
+
+    @Override
+    public boolean remove(final Object object, final int count) {
+        return decorated().remove(object, count);
+    }
+
+    @Override
+    public Set<E> uniqueSet() {
+        return decorated().uniqueSet();
+    }
+
+    @Override
+    public int getCount(final Object object) {
+        return decorated().getCount(object);
+    }
+
+}

fine-commons-collections4/src/com/fr/third/org/apache/commons/collections4/bag/PredicatedSortedBag.java

@@ -0,0 +1,108 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.fr.third.org.apache.commons.collections4.bag;
+
+import java.util.Comparator;
+
+import com.fr.third.org.apache.commons.collections4.Predicate;
+import com.fr.third.org.apache.commons.collections4.SortedBag;
+
+/**
+ * Decorates another {@link SortedBag} to validate that additions
+ * match a specified predicate.
+ * <p>
+ * This bag exists to provide validation for the decorated bag.
+ * It is normally created to decorate an empty bag.
+ * If an object cannot be added to the bag, an {@link IllegalArgumentException} is thrown.
+ * <p>
+ * One usage would be to ensure that no null entries are added to the bag.
+ * <pre>
+ * SortedBag bag = PredicatedSortedBag.predicatedSortedBag(new TreeBag(), NotNullPredicate.INSTANCE);
+ * </pre>
+ * <p>
+ * This class is Serializable from Commons Collections 3.1.
+ *
+ * @since 3.0
+ * @version $Id: PredicatedSortedBag.java 1686855 2015-06-22 13:00:27Z tn $
+ */
+public class PredicatedSortedBag<E> extends PredicatedBag<E> implements SortedBag<E> {
+
+    /** Serialization version */
+    private static final long serialVersionUID = 3448581314086406616L;
+
+    /**
+     * Factory method to create a predicated (validating) bag.
+     * <p>
+     * If there are any elements already in the bag being decorated, they
+     * are validated.
+     *
+     * @param <E> the type of the elements in the bag
+     * @param bag  the bag to decorate, must not be null
+     * @param predicate  the predicate to use for validation, must not be null
+     * @return a new predicated SortedBag
+     * @throws NullPointerException if bag or predicate is null
+     * @throws IllegalArgumentException if the bag contains invalid elements
+     * @since 4.0
+     */
+    public static <E> PredicatedSortedBag<E> predicatedSortedBag(final SortedBag<E> bag,
+                                                                 final Predicate<? super E> predicate) {
+        return new PredicatedSortedBag<E>(bag, predicate);
+    }
+
+    //-----------------------------------------------------------------------
+    /**
+     * Constructor that wraps (not copies).
+     * <p>If there are any elements already in the bag being decorated, they
+     * are validated.
+     *
+     * @param bag  the bag to decorate, must not be null
+     * @param predicate  the predicate to use for validation, must not be null
+     * @throws NullPointerException if bag or predicate is null
+     * @throws IllegalArgumentException if the bag contains invalid elements
+     */
+    protected PredicatedSortedBag(final SortedBag<E> bag, final Predicate<? super E> predicate) {
+        super(bag, predicate);
+    }
+
+    /**
+     * Gets the decorated sorted bag.
+     *
+     * @return the decorated bag
+     */
+    @Override
+    protected SortedBag<E> decorated() {
+        return (SortedBag<E>) super.decorated();
+    }
+
+    //-----------------------------------------------------------------------
+
+    @Override
+    public E first() {
+        return decorated().first();
+    }
+
+    @Override
+    public E last() {
+        return decorated().last();
+    }
+
+    @Override
+    public Comparator<? super E> comparator() {
+        return decorated().comparator();
+    }
+
+}

fine-commons-collections4/src/com/fr/third/org/apache/commons/collections4/bag/SynchronizedBag.java

@@ -0,0 +1,151 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.fr.third.org.apache.commons.collections4.bag;
+
+import java.util.Set;
+
+import com.fr.third.org.apache.commons.collections4.Bag;
+import com.fr.third.org.apache.commons.collections4.collection.SynchronizedCollection;
+
+/**
+ * Decorates another {@link Bag} to synchronize its behaviour
+ * for a multi-threaded environment.
+ * <p>
+ * Methods are synchronized, then forwarded to the decorated bag.
+ * Iterators must be separately synchronized around the loop.
+ * <p>
+ * This class is Serializable from Commons Collections 3.1.
+ *
+ * @since 3.0
+ * @version $Id: SynchronizedBag.java 1686855 2015-06-22 13:00:27Z tn $
+ */
+public class SynchronizedBag<E> extends SynchronizedCollection<E> implements Bag<E> {
+
+    /** Serialization version */
+    private static final long serialVersionUID = 8084674570753837109L;
+
+    /**
+     * Factory method to create a synchronized bag.
+     *
+     * @param <E> the type of the elements in the bag
+     * @param bag  the bag to decorate, must not be null
+     * @return a new synchronized Bag
+     * @throws NullPointerException if bag is null
+     * @since 4.0
+     */
+    public static <E> SynchronizedBag<E> synchronizedBag(final Bag<E> bag) {
+        return new SynchronizedBag<E>(bag);
+    }
+
+    //-----------------------------------------------------------------------
+    /**
+     * Constructor that wraps (not copies).
+     *
+     * @param bag  the bag to decorate, must not be null
+     * @throws NullPointerException if bag is null
+     */
+    protected SynchronizedBag(final Bag<E> bag) {
+        super(bag);
+    }
+
+    /**
+     * Constructor that wraps (not copies).
+     *
+     * @param bag  the bag to decorate, must not be null
+     * @param lock  the lock to use, must not be null
+     * @throws NullPointerException if bag or lock is null
+     */
+    protected SynchronizedBag(final Bag<E> bag, final Object lock) {
+        super(bag, lock);
+    }
+
+    /**
+     * Gets the bag being decorated.
+     *
+     * @return the decorated bag
+     */
+    protected Bag<E> getBag() {
+        return (Bag<E>) decorated();
+    }
+
+    @Override
+    public boolean equals(final Object object) {
+        if (object == this) {
+            return true;
+        }
+        synchronized (lock) {
+            return getBag().equals(object);
+        }
+    }
+
+    @Override
+    public int hashCode() {
+        synchronized (lock) {
+            return getBag().hashCode();
+        }
+    }
+
+    //-----------------------------------------------------------------------
+
+    @Override
+    public boolean add(final E object, final int count) {
+        synchronized (lock) {
+            return getBag().add(object, count);
+        }
+    }
+
+    @Override
+    public boolean remove(final Object object, final int count) {
+        synchronized (lock) {
+            return getBag().remove(object, count);
+        }
+    }
+
+    @Override
+    public Set<E> uniqueSet() {
+        synchronized (lock) {
+            final Set<E> set = getBag().uniqueSet();
+            return new SynchronizedBagSet(set, lock);
+        }
+    }
+
+    @Override
+    public int getCount(final Object object) {
+        synchronized (lock) {
+            return getBag().getCount(object);
+        }
+    }
+
+    //-----------------------------------------------------------------------
+    /**
+     * Synchronized Set for the Bag class.
+     */
+    class SynchronizedBagSet extends SynchronizedCollection<E> implements Set<E> {
+        /** Serialization version */
+        private static final long serialVersionUID = 2990565892366827855L;
+
+        /**
+         * Constructor.
+         * @param set  the set to decorate
+         * @param lock  the lock to use, shared with the bag
+         */
+        SynchronizedBagSet(final Set<E> set, final Object lock) {
+            super(set, lock);
+        }
+    }
+
+}

fine-commons-collections4/src/com/fr/third/org/apache/commons/collections4/bag/SynchronizedSortedBag.java

@@ -0,0 +1,108 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.fr.third.org.apache.commons.collections4.bag;
+
+import java.util.Comparator;
+
+import com.fr.third.org.apache.commons.collections4.Bag;
+import com.fr.third.org.apache.commons.collections4.SortedBag;
+
+/**
+ * Decorates another {@link SortedBag} to synchronize its behaviour
+ * for a multi-threaded environment.
+ * <p>
+ * Methods are synchronized, then forwarded to the decorated bag.
+ * Iterators must be separately synchronized around the loop.
+ * <p>
+ * This class is Serializable from Commons Collections 3.1.
+ *
+ * @since 3.0
+ * @version $Id: SynchronizedSortedBag.java 1686855 2015-06-22 13:00:27Z tn $
+ */
+public class SynchronizedSortedBag<E> extends SynchronizedBag<E> implements SortedBag<E> {
+
+    /** Serialization version */
+    private static final long serialVersionUID = 722374056718497858L;
+
+    /**
+     * Factory method to create a synchronized sorted bag.
+     *
+     * @param <E> the type of the elements in the bag
+     * @param bag  the bag to decorate, must not be null
+     * @return a new synchronized SortedBag
+     * @throws NullPointerException if bag is null
+     * @since 4.0
+     */
+    public static <E> SynchronizedSortedBag<E> synchronizedSortedBag(final SortedBag<E> bag) {
+        return new SynchronizedSortedBag<E>(bag);
+    }
+
+    //-----------------------------------------------------------------------
+    /**
+     * Constructor that wraps (not copies).
+     *
+     * @param bag  the bag to decorate, must not be null
+     * @throws NullPointerException if bag is null
+     */
+    protected SynchronizedSortedBag(final SortedBag<E> bag) {
+        super(bag);
+    }
+
+    /**
+     * Constructor that wraps (not copies).
+     *
+     * @param bag  the bag to decorate, must not be null
+     * @param lock  the lock to use, must not be null
+     * @throws NullPointerException if bag or lock is null
+     */
+    protected SynchronizedSortedBag(final Bag<E> bag, final Object lock) {
+        super(bag, lock);
+    }
+
+    /**
+     * Gets the bag being decorated.
+     *
+     * @return the decorated bag
+     */
+    protected SortedBag<E> getSortedBag() {
+        return (SortedBag<E>) decorated();
+    }
+
+    //-----------------------------------------------------------------------
+
+    @Override
+    public synchronized E first() {
+        synchronized (lock) {
+            return getSortedBag().first();
+        }
+    }
+
+    @Override
+    public synchronized E last() {
+        synchronized (lock) {
+            return getSortedBag().last();
+        }
+    }
+
+    @Override
+    public synchronized Comparator<? super E> comparator() {
+        synchronized (lock) {
+            return getSortedBag().comparator();
+        }
+    }
+
+}

fine-commons-collections4/src/com/fr/third/org/apache/commons/collections4/bag/TransformedBag.java

@@ -0,0 +1,150 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.fr.third.org.apache.commons.collections4.bag;
+
+import java.util.Set;
+
+import com.fr.third.org.apache.commons.collections4.Transformer;
+import com.fr.third.org.apache.commons.collections4.set.TransformedSet;
+import com.fr.third.org.apache.commons.collections4.Bag;
+import com.fr.third.org.apache.commons.collections4.Transformer;
+import com.fr.third.org.apache.commons.collections4.collection.TransformedCollection;
+import com.fr.third.org.apache.commons.collections4.set.TransformedSet;
+
+/**
+ * Decorates another {@link Bag} to transform objects that are added.
+ * <p>
+ * The add methods are affected by this class.
+ * Thus objects must be removed or searched for using their transformed form.
+ * For example, if the transformation converts Strings to Integers, you must
+ * use the Integer form to remove objects.
+ * <p>
+ * This class is Serializable from Commons Collections 3.1.
+ *
+ * @since 3.0
+ * @version $Id: TransformedBag.java 1686855 2015-06-22 13:00:27Z tn $
+ */
+public class TransformedBag<E> extends TransformedCollection<E> implements Bag<E> {
+
+    /** Serialization version */
+    private static final long serialVersionUID = 5421170911299074185L;
+
+    /**
+     * Factory method to create a transforming bag.
+     * <p>
+     * If there are any elements already in the bag being decorated, they
+     * are NOT transformed. Contrast this with {@link #transformedBag(Bag, Transformer)}.
+     *
+     * @param <E> the type of the elements in the bag
+     * @param bag  the bag to decorate, must not be null
+     * @param transformer  the transformer to use for conversion, must not be null
+     * @return a new transformed Bag
+     * @throws NullPointerException if bag or transformer is null
+     * @since 4.0
+     */
+    public static <E> Bag<E> transformingBag(final Bag<E> bag, final Transformer<? super E, ? extends E> transformer) {
+        return new TransformedBag<E>(bag, transformer);
+    }
+
+    /**
+     * Factory method to create a transforming bag that will transform
+     * existing contents of the specified bag.
+     * <p>
+     * If there are any elements already in the bag being decorated, they
+     * will be transformed by this method.
+     * Contrast this with {@link #transformingBag(Bag, Transformer)}.
+     *
+     * @param <E> the type of the elements in the bag
+     * @param bag  the bag to decorate, must not be null
+     * @param transformer  the transformer to use for conversion, must not be null
+     * @return a new transformed Bag
+     * @throws NullPointerException if bag or transformer is null
+     * @since 4.0
+     */
+    public static <E> Bag<E> transformedBag(final Bag<E> bag, final Transformer<? super E, ? extends E> transformer) {
+        final TransformedBag<E> decorated = new TransformedBag<E>(bag, transformer);
+        if (bag.size() > 0) {
+            @SuppressWarnings("unchecked") // Bag is of type E
+            final E[] values = (E[]) bag.toArray(); // NOPMD - false positive for generics
+            bag.clear();
+            for (final E value : values) {
+                decorated.decorated().add(transformer.transform(value));
+            }
+        }
+        return decorated;
+    }
+
+    //-----------------------------------------------------------------------
+    /**
+     * Constructor that wraps (not copies).
+     * <p>
+     * If there are any elements already in the bag being decorated, they
+     * are NOT transformed.
+     *
+     * @param bag  the bag to decorate, must not be null
+     * @param transformer  the transformer to use for conversion, must not be null
+     * @throws NullPointerException if bag or transformer is null
+     */
+    protected TransformedBag(final Bag<E> bag, final Transformer<? super E, ? extends E> transformer) {
+        super(bag, transformer);
+    }
+
+    /**
+     * Gets the decorated bag.
+     *
+     * @return the decorated bag
+     */
+    protected Bag<E> getBag() {
+        return (Bag<E>) decorated();
+    }
+
+    @Override
+    public boolean equals(final Object object) {
+        return object == this || decorated().equals(object);
+    }
+
+    @Override
+    public int hashCode() {
+        return decorated().hashCode();
+    }
+
+    //-----------------------------------------------------------------------
+
+    @Override
+    public int getCount(final Object object) {
+        return getBag().getCount(object);
+    }
+
+    @Override
+    public boolean remove(final Object object, final int nCopies) {
+        return getBag().remove(object, nCopies);
+    }
+
+    //-----------------------------------------------------------------------
+
+    @Override
+    public boolean add(final E object, final int nCopies) {
+        return getBag().add(transform(object), nCopies);
+    }
+
+    @Override
+    public Set<E> uniqueSet() {
+        final Set<E> set = getBag().uniqueSet();
+        return TransformedSet.<E>transformingSet(set, transformer);
+    }
+
+}

fine-commons-collections4/src/com/fr/third/org/apache/commons/collections4/bag/TransformedSortedBag.java

@@ -0,0 +1,132 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.fr.third.org.apache.commons.collections4.bag;
+
+import java.util.Comparator;
+
+import com.fr.third.org.apache.commons.collections4.Transformer;
+import com.fr.third.org.apache.commons.collections4.SortedBag;
+import com.fr.third.org.apache.commons.collections4.Transformer;
+
+/**
+ * Decorates another {@link SortedBag} to transform objects that are added.
+ * <p>
+ * The add methods are affected by this class.
+ * Thus objects must be removed or searched for using their transformed form.
+ * For example, if the transformation converts Strings to Integers, you must
+ * use the Integer form to remove objects.
+ * <p>
+ * This class is Serializable from Commons Collections 3.1.
+ *
+ * @since 3.0
+ * @version $Id: TransformedSortedBag.java 1686855 2015-06-22 13:00:27Z tn $
+ */
+public class TransformedSortedBag<E> extends TransformedBag<E> implements SortedBag<E> {
+
+    /** Serialization version */
+    private static final long serialVersionUID = -251737742649401930L;
+
+    /**
+     * Factory method to create a transforming sorted bag.
+     * <p>
+     * If there are any elements already in the bag being decorated, they
+     * are NOT transformed. Contrast this with {@link #transformedSortedBag(SortedBag, Transformer)}.
+     *
+     * @param <E> the type of the elements in the bag
+     * @param bag  the bag to decorate, must not be null
+     * @param transformer  the transformer to use for conversion, must not be null
+     * @return a new transformed SortedBag
+     * @throws NullPointerException if bag or transformer is null
+     * @since 4.0
+     */
+    public static <E> TransformedSortedBag<E> transformingSortedBag(final SortedBag<E> bag,
+            final Transformer<? super E, ? extends E> transformer) {
+        return new TransformedSortedBag<E>(bag, transformer);
+    }
+
+    /**
+     * Factory method to create a transforming sorted bag that will transform
+     * existing contents of the specified sorted bag.
+     * <p>
+     * If there are any elements already in the bag being decorated, they
+     * will be transformed by this method.
+     * Contrast this with {@link #transformingSortedBag(SortedBag, Transformer)}.
+     *
+     * @param <E> the type of the elements in the bag
+     * @param bag  the bag to decorate, must not be null
+     * @param transformer  the transformer to use for conversion, must not be null
+     * @return a new transformed SortedBag
+     * @throws NullPointerException if bag or transformer is null
+     * @since 4.0
+     */
+    public static <E> TransformedSortedBag<E> transformedSortedBag(final SortedBag<E> bag,
+            final Transformer<? super E, ? extends E> transformer) {
+
+        final TransformedSortedBag<E>  decorated = new TransformedSortedBag<E>(bag, transformer);
+        if (bag.size() > 0) {
+            @SuppressWarnings("unchecked") // bag is type E
+            final E[] values = (E[]) bag.toArray(); // NOPMD - false positive for generics
+            bag.clear();
+            for (final E value : values) {
+                decorated.decorated().add(transformer.transform(value));
+            }
+        }
+        return decorated;
+    }
+
+    //-----------------------------------------------------------------------
+    /**
+     * Constructor that wraps (not copies).
+     * <p>
+     * If there are any elements already in the bag being decorated, they
+     * are NOT transformed.
+     *
+     * @param bag  the bag to decorate, must not be null
+     * @param transformer  the transformer to use for conversion, must not be null
+     * @throws NullPointerException if bag or transformer is null
+     */
+    protected TransformedSortedBag(final SortedBag<E> bag, final Transformer<? super E, ? extends E> transformer) {
+        super(bag, transformer);
+    }
+
+    /**
+     * Gets the decorated bag.
+     *
+     * @return the decorated bag
+     */
+    protected SortedBag<E> getSortedBag() {
+        return (SortedBag<E>) decorated();
+    }
+
+    //-----------------------------------------------------------------------
+
+    @Override
+    public E first() {
+        return getSortedBag().first();
+    }
+
+    @Override
+    public E last() {
+        return getSortedBag().last();
+    }
+
+    @Override
+    public Comparator<? super E> comparator() {
+        return getSortedBag().comparator();
+    }
+
+}

fine-commons-collections4/src/com/fr/third/org/apache/commons/collections4/bag/TreeBag.java

@@ -0,0 +1,140 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.fr.third.org.apache.commons.collections4.bag;
+
+import java.io.IOException;
+import java.io.ObjectInputStream;
+import java.io.ObjectOutputStream;
+import java.io.Serializable;
+import java.util.Collection;
+import java.util.Comparator;
+import java.util.SortedMap;
+import java.util.TreeMap;
+
+import com.fr.third.org.apache.commons.collections4.SortedBag;
+
+/**
+ * Implements {@link SortedBag}, using a {@link TreeMap} to provide the data storage.
+ * This is the standard implementation of a sorted bag.
+ * <p>
+ * Order will be maintained among the bag members and can be viewed through the iterator.
+ * <p>
+ * A {@link org.apache.commons.collections4.Bag Bag} stores each object in the collection
+ * together with a count of occurrences. Extra methods on the interface allow multiple
+ * copies of an object to be added or removed at once. It is important to read the interface
+ * javadoc carefully as several methods violate the {@link Collection} interface specification.
+ *
+ * @since 3.0 (previously in main package v2.0)
+ * @version $Id: TreeBag.java 1683951 2015-06-06 20:19:03Z tn $
+ */
+public class TreeBag<E> extends AbstractMapBag<E> implements SortedBag<E>, Serializable {
+
+    /** Serial version lock */
+    private static final long serialVersionUID = -7740146511091606676L;
+
+    /**
+     * Constructs an empty {@link TreeBag}.
+     */
+    public TreeBag() {
+        super(new TreeMap<E, MutableInteger>());
+    }
+
+    /**
+     * Constructs an empty bag that maintains order on its unique representative
+     * members according to the given {@link Comparator}.
+     *
+     * @param comparator the comparator to use
+     */
+    public TreeBag(final Comparator<? super E> comparator) {
+        super(new TreeMap<E, MutableInteger>(comparator));
+    }
+
+    /**
+     * Constructs a {@link TreeBag} containing all the members of the
+     * specified collection.
+     *
+     * @param coll the collection to copy into the bag
+     */
+    public TreeBag(final Collection<? extends E> coll) {
+        this();
+        addAll(coll);
+    }
+
+    //-----------------------------------------------------------------------
+    /**
+     * {@inheritDoc}
+     *
+     * @throws IllegalArgumentException if the object to be added does not implement
+     * {@link Comparable} and the {@link TreeBag} is using natural ordering
+     * @throws NullPointerException if the specified key is null and this bag uses
+     * natural ordering, or its comparator does not permit null keys
+     */
+    @Override
+    public boolean add(final E object) {
+        if(comparator() == null && !(object instanceof Comparable)) {
+            if (object == null) {
+                throw new NullPointerException();
+            }
+            throw new IllegalArgumentException("Objects of type " + object.getClass() + " cannot be added to " +
+                                               "a naturally ordered TreeBag as it does not implement Comparable");
+        }
+        return super.add(object);
+    }
+
+    //-----------------------------------------------------------------------
+
+    @Override
+    public E first() {
+        return getMap().firstKey();
+    }
+
+    @Override
+    public E last() {
+        return getMap().lastKey();
+    }
+
+    @Override
+    public Comparator<? super E> comparator() {
+        return getMap().comparator();
+    }
+
+    @Override
+    protected SortedMap<E, AbstractMapBag.MutableInteger> getMap() {
+        return (SortedMap<E, AbstractMapBag.MutableInteger>) super.getMap();
+    }
+
+    //-----------------------------------------------------------------------
+    /**
+     * Write the bag out using a custom routine.
+     */
+    private void writeObject(final ObjectOutputStream out) throws IOException {
+        out.defaultWriteObject();
+        out.writeObject(comparator());
+        super.doWriteObject(out);
+    }
+
+    /**
+     * Read the bag in using a custom routine.
+     */
+    private void readObject(final ObjectInputStream in) throws IOException, ClassNotFoundException {
+        in.defaultReadObject();
+        @SuppressWarnings("unchecked")  // This will fail at runtime if the stream is incorrect
+        final Comparator<? super E> comp = (Comparator<? super E>) in.readObject();
+        super.doReadObject(new TreeMap<E, MutableInteger>(comp), in);
+    }
+
+}

fine-commons-collections4/src/com/fr/third/org/apache/commons/collections4/bag/UnmodifiableBag.java

@@ -0,0 +1,159 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.fr.third.org.apache.commons.collections4.bag;
+
+import java.io.IOException;
+import java.io.ObjectInputStream;
+import java.io.ObjectOutputStream;
+import java.util.Collection;
+import java.util.Iterator;
+import java.util.Set;
+
+import com.fr.third.org.apache.commons.collections4.set.UnmodifiableSet;
+import com.fr.third.org.apache.commons.collections4.Bag;
+import com.fr.third.org.apache.commons.collections4.Unmodifiable;
+import com.fr.third.org.apache.commons.collections4.iterators.UnmodifiableIterator;
+import com.fr.third.org.apache.commons.collections4.set.UnmodifiableSet;
+
+/**
+ * Decorates another {@link Bag} to ensure it can't be altered.
+ * <p>
+ * This class is Serializable from Commons Collections 3.1.
+ * <p>
+ * Attempts to modify it will result in an UnsupportedOperationException.
+ *
+ * @since 3.0
+ * @version $Id: UnmodifiableBag.java 1686855 2015-06-22 13:00:27Z tn $
+ */
+public final class UnmodifiableBag<E>
+        extends AbstractBagDecorator<E> implements Unmodifiable {
+
+    /** Serialization version */
+    private static final long serialVersionUID = -1873799975157099624L;
+
+    /**
+     * Factory method to create an unmodifiable bag.
+     * <p>
+     * If the bag passed in is already unmodifiable, it is returned.
+     *
+     * @param <E> the type of the elements in the bag
+     * @param bag  the bag to decorate, must not be null
+     * @return an unmodifiable Bag
+     * @throws NullPointerException if bag is null
+     * @since 4.0
+     */
+    public static <E> Bag<E> unmodifiableBag(final Bag<? extends E> bag) {
+        if (bag instanceof Unmodifiable) {
+            @SuppressWarnings("unchecked") // safe to upcast
+            final Bag<E> tmpBag = (Bag<E>) bag;
+            return tmpBag;
+        }
+        return new UnmodifiableBag<E>(bag);
+    }
+
+    //-----------------------------------------------------------------------
+    /**
+     * Constructor that wraps (not copies).
+     *
+     * @param bag  the bag to decorate, must not be null
+     * @throws NullPointerException if bag is null
+     */
+    @SuppressWarnings("unchecked") // safe to upcast
+    private UnmodifiableBag(final Bag<? extends E> bag) {
+        super((Bag<E>) bag);
+    }
+
+    //-----------------------------------------------------------------------
+    /**
+     * Write the collection out using a custom routine.
+     *
+     * @param out  the output stream
+     * @throws IOException
+     */
+    private void writeObject(final ObjectOutputStream out) throws IOException {
+        out.defaultWriteObject();
+        out.writeObject(decorated());
+    }
+
+    /**
+     * Read the collection in using a custom routine.
+     *
+     * @param in  the input stream
+     * @throws IOException
+     * @throws ClassNotFoundException
+     * @throws ClassCastException if deserialised object has wrong type
+     */
+    @SuppressWarnings("unchecked") // will throw CCE, see Javadoc
+    private void readObject(final ObjectInputStream in) throws IOException, ClassNotFoundException {
+        in.defaultReadObject();
+        setCollection((Collection<E>) in.readObject());
+    }
+
+    //-----------------------------------------------------------------------
+    @Override
+    public Iterator<E> iterator() {
+        return UnmodifiableIterator.<E> unmodifiableIterator(decorated().iterator());
+    }
+
+    @Override
+    public boolean add(final E object) {
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public boolean addAll(final Collection<? extends E> coll) {
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public void clear() {
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public boolean remove(final Object object) {
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public boolean removeAll(final Collection<?> coll) {
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public boolean retainAll(final Collection<?> coll) {
+        throw new UnsupportedOperationException();
+    }
+
+    //-----------------------------------------------------------------------
+    @Override
+    public boolean add(final E object, final int count) {
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public boolean remove(final Object object, final int count) {
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public Set<E> uniqueSet() {
+        final Set<E> set = decorated().uniqueSet();
+        return UnmodifiableSet.<E> unmodifiableSet(set);
+    }
+
+}

fine-commons-collections4/src/com/fr/third/org/apache/commons/collections4/bag/UnmodifiableSortedBag.java

@@ -0,0 +1,156 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.fr.third.org.apache.commons.collections4.bag;
+
+import java.io.IOException;
+import java.io.ObjectInputStream;
+import java.io.ObjectOutputStream;
+import java.util.Collection;
+import java.util.Iterator;
+import java.util.Set;
+
+import com.fr.third.org.apache.commons.collections4.set.UnmodifiableSet;
+import com.fr.third.org.apache.commons.collections4.SortedBag;
+import com.fr.third.org.apache.commons.collections4.Unmodifiable;
+import com.fr.third.org.apache.commons.collections4.iterators.UnmodifiableIterator;
+import com.fr.third.org.apache.commons.collections4.set.UnmodifiableSet;
+
+/**
+ * Decorates another {@link SortedBag} to ensure it can't be altered.
+ * <p>
+ * This class is Serializable from Commons Collections 3.1.
+ * <p>
+ * Attempts to modify it will result in an UnsupportedOperationException.
+ *
+ * @since 3.0
+ * @version $Id: UnmodifiableSortedBag.java 1686855 2015-06-22 13:00:27Z tn $
+ */
+public final class UnmodifiableSortedBag<E>
+        extends AbstractSortedBagDecorator<E> implements Unmodifiable {
+
+    /** Serialization version */
+    private static final long serialVersionUID = -3190437252665717841L;
+
+    /**
+     * Factory method to create an unmodifiable bag.
+     * <p>
+     * If the bag passed in is already unmodifiable, it is returned.
+     *
+     * @param <E> the type of the elements in the bag
+     * @param bag  the bag to decorate, must not be null
+     * @return an unmodifiable SortedBag
+     * @throws NullPointerException if bag is null
+     * @since 4.0
+     */
+    public static <E> SortedBag<E> unmodifiableSortedBag(final SortedBag<E> bag) {
+        if (bag instanceof Unmodifiable) {
+            return bag;
+        }
+        return new UnmodifiableSortedBag<E>(bag);
+    }
+
+    //-----------------------------------------------------------------------
+    /**
+     * Constructor that wraps (not copies).
+     *
+     * @param bag  the bag to decorate, must not be null
+     * @throws NullPointerException if bag is null
+     */
+    private UnmodifiableSortedBag(final SortedBag<E> bag) {
+        super(bag);
+    }
+
+    //-----------------------------------------------------------------------
+    /**
+     * Write the collection out using a custom routine.
+     *
+     * @param out  the output stream
+     * @throws IOException
+     */
+    private void writeObject(final ObjectOutputStream out) throws IOException {
+        out.defaultWriteObject();
+        out.writeObject(decorated());
+    }
+
+    /**
+     * Read the collection in using a custom routine.
+     *
+     * @param in  the input stream
+     * @throws IOException
+     * @throws ClassNotFoundException
+     * @throws ClassCastException if deserialised object has wrong type
+     */
+    @SuppressWarnings("unchecked") // will throw CCE, see Javadoc
+    private void readObject(final ObjectInputStream in) throws IOException, ClassNotFoundException {
+        in.defaultReadObject();
+        setCollection((Collection<E>) in.readObject());
+    }
+
+    //-----------------------------------------------------------------------
+    @Override
+    public Iterator<E> iterator() {
+        return UnmodifiableIterator.unmodifiableIterator(decorated().iterator());
+    }
+
+    @Override
+    public boolean add(final E object) {
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public boolean addAll(final Collection<? extends E> coll) {
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public void clear() {
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public boolean remove(final Object object) {
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public boolean removeAll(final Collection<?> coll) {
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public boolean retainAll(final Collection<?> coll) {
+        throw new UnsupportedOperationException();
+    }
+
+    //-----------------------------------------------------------------------
+    @Override
+    public boolean add(final E object, final int count) {
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public boolean remove(final Object object, final int count) {
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public Set<E> uniqueSet() {
+        final Set<E> set = decorated().uniqueSet();
+        return UnmodifiableSet.unmodifiableSet(set);
+    }
+
+}

fine-commons-collections4/src/com/fr/third/org/apache/commons/collections4/bag/package-info.java

@@ -0,0 +1,39 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+/**
+ * This package contains implementations of the {@link org.apache.commons.collections4.Bag Bag} and
+ * {@link org.apache.commons.collections4.SortedBag SortedBag} interfaces.
+ * A bag stores an object and a count of the number of occurrences of the object.
+ * <p>
+ * The following implementations are provided in the package:
+ * <ul>
+ *   <li>HashBag - implementation that uses a HashMap to store the data
+ *   <li>TreeBag - implementation that uses a TreeMap to store the data
+ * </ul>
+ * <p>
+ * The following decorators are provided in the package:
+ * <ul>
+ *   <li>Synchronized - synchronizes method access for multi-threaded environments
+ *   <li>Unmodifiable - ensures the bag cannot be altered
+ *   <li>Predicated - ensures that only elements that are valid according to a predicate can be added
+ *   <li>Transformed - transforms each element added to the bag
+ *   <li>Collection - ensures compliance with the java.util.Collection contract
+ * </ul>
+ *
+ * @version $Id: package-info.java 1540804 2013-11-11 18:58:31Z tn $
+ */
+package com.fr.third.org.apache.commons.collections4.bag;

fine-commons-collections4/src/com/fr/third/org/apache/commons/collections4/bidimap/AbstractBidiMapDecorator.java

@@ -0,0 +1,89 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.fr.third.org.apache.commons.collections4.bidimap;
+
+import java.util.Set;
+
+import com.fr.third.org.apache.commons.collections4.BidiMap;
+import com.fr.third.org.apache.commons.collections4.MapIterator;
+import com.fr.third.org.apache.commons.collections4.map.AbstractMapDecorator;
+
+/**
+ * Provides a base decorator that enables additional functionality to be added
+ * to a BidiMap via decoration.
+ * <p>
+ * Methods are forwarded directly to the decorated map.
+ * <p>
+ * This implementation does not perform any special processing with the map views.
+ * Instead it simply returns the set/collection from the wrapped map. This may be
+ * undesirable, for example if you are trying to write a validating implementation
+ * it would provide a loophole around the validation.
+ * But, you might want that loophole, so this class is kept simple.
+ *
+ * @since 3.0
+ * @version $Id: AbstractBidiMapDecorator.java 1686855 2015-06-22 13:00:27Z tn $
+ */
+public abstract class AbstractBidiMapDecorator<K, V>
+        extends AbstractMapDecorator<K, V> implements BidiMap<K, V> {
+
+    /**
+     * Constructor that wraps (not copies).
+     *
+     * @param map  the map to decorate, must not be null
+     * @throws NullPointerException if the collection is null
+     */
+    protected AbstractBidiMapDecorator(final BidiMap<K, V> map) {
+        super(map);
+    }
+
+    /**
+     * Gets the map being decorated.
+     *
+     * @return the decorated map
+     */
+    @Override
+    protected BidiMap<K, V> decorated() {
+        return (BidiMap<K, V>) super.decorated();
+    }
+
+    //-----------------------------------------------------------------------
+    @Override
+    public MapIterator<K, V> mapIterator() {
+        return decorated().mapIterator();
+    }
+
+    @Override
+    public K getKey(final Object value) {
+        return decorated().getKey(value);
+    }
+
+    @Override
+    public K removeValue(final Object value) {
+        return decorated().removeValue(value);
+    }
+
+    @Override
+    public BidiMap<V, K> inverseBidiMap() {
+        return decorated().inverseBidiMap();
+    }
+
+    @Override
+    public Set<V> values() {
+        return decorated().values();
+    }
+
+}

fine-commons-collections4/src/com/fr/third/org/apache/commons/collections4/bidimap/AbstractDualBidiMap.java

@@ -0,0 +1,806 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.fr.third.org.apache.commons.collections4.bidimap;
+
+import java.util.Collection;
+import java.util.Iterator;
+import java.util.Map;
+import java.util.Set;
+
+import com.fr.third.org.apache.commons.collections4.keyvalue.AbstractMapEntryDecorator;
+import com.fr.third.org.apache.commons.collections4.BidiMap;
+import com.fr.third.org.apache.commons.collections4.MapIterator;
+import com.fr.third.org.apache.commons.collections4.ResettableIterator;
+import com.fr.third.org.apache.commons.collections4.collection.AbstractCollectionDecorator;
+import com.fr.third.org.apache.commons.collections4.iterators.AbstractIteratorDecorator;
+import com.fr.third.org.apache.commons.collections4.keyvalue.AbstractMapEntryDecorator;
+
+/**
+ * Abstract {@link BidiMap} implemented using two maps.
+ * <p>
+ * An implementation can be written simply by implementing the
+ * {@link #createBidiMap(Map, Map, BidiMap)} method.
+ *
+ * @see DualHashBidiMap
+ * @see DualTreeBidiMap
+ * @since 3.0
+ * @version $Id: AbstractDualBidiMap.java 1683951 2015-06-06 20:19:03Z tn $
+ */
+public abstract class AbstractDualBidiMap<K, V> implements BidiMap<K, V> {
+
+    /**
+     * Normal delegate map.
+     */
+    transient Map<K, V> normalMap;
+
+    /**
+     * Reverse delegate map.
+     */
+    transient Map<V, K> reverseMap;
+
+    /**
+     * Inverse view of this map.
+     */
+    transient BidiMap<V, K> inverseBidiMap = null;
+
+    /**
+     * View of the keys.
+     */
+    transient Set<K> keySet = null;
+
+    /**
+     * View of the values.
+     */
+    transient Set<V> values = null;
+
+    /**
+     * View of the entries.
+     */
+    transient Set<Map.Entry<K, V>> entrySet = null;
+
+    /**
+     * Creates an empty map, initialised by <code>createMap</code>.
+     * <p>
+     * This constructor remains in place for deserialization.
+     * All other usage is deprecated in favour of
+     * {@link #AbstractDualBidiMap(Map, Map)}.
+     */
+    protected AbstractDualBidiMap() {
+        super();
+    }
+
+    /**
+     * Creates an empty map using the two maps specified as storage.
+     * <p>
+     * The two maps must be a matching pair, normal and reverse.
+     * They will typically both be empty.
+     * <p>
+     * Neither map is validated, so nulls may be passed in.
+     * If you choose to do this then the subclass constructor must populate
+     * the <code>maps[]</code> instance variable itself.
+     *
+     * @param normalMap  the normal direction map
+     * @param reverseMap  the reverse direction map
+     * @since 3.1
+     */
+    protected AbstractDualBidiMap(final Map<K, V> normalMap, final Map<V, K> reverseMap) {
+        super();
+        this.normalMap = normalMap;
+        this.reverseMap = reverseMap;
+    }
+
+    /**
+     * Constructs a map that decorates the specified maps,
+     * used by the subclass <code>createBidiMap</code> implementation.
+     *
+     * @param normalMap  the normal direction map
+     * @param reverseMap  the reverse direction map
+     * @param inverseBidiMap  the inverse BidiMap
+     */
+    protected AbstractDualBidiMap(final Map<K, V> normalMap, final Map<V, K> reverseMap,
+                                  final BidiMap<V, K> inverseBidiMap) {
+        super();
+        this.normalMap = normalMap;
+        this.reverseMap = reverseMap;
+        this.inverseBidiMap = inverseBidiMap;
+    }
+
+    /**
+     * Creates a new instance of the subclass.
+     *
+     * @param normalMap  the normal direction map
+     * @param reverseMap  the reverse direction map
+     * @param inverseMap  this map, which is the inverse in the new map
+     * @return the inverse map
+     */
+    protected abstract BidiMap<V, K> createBidiMap(Map<V, K> normalMap, Map<K, V> reverseMap, BidiMap<K, V> inverseMap);
+
+    // Map delegation
+    //-----------------------------------------------------------------------
+
+    @Override
+    public V get(final Object key) {
+        return normalMap.get(key);
+    }
+
+    @Override
+    public int size() {
+        return normalMap.size();
+    }
+
+    @Override
+    public boolean isEmpty() {
+        return normalMap.isEmpty();
+    }
+
+    @Override
+    public boolean containsKey(final Object key) {
+        return normalMap.containsKey(key);
+    }
+
+    @Override
+    public boolean equals(final Object obj) {
+        return normalMap.equals(obj);
+    }
+
+    @Override
+    public int hashCode() {
+        return normalMap.hashCode();
+    }
+
+    @Override
+    public String toString() {
+        return normalMap.toString();
+    }
+
+    // BidiMap changes
+    //-----------------------------------------------------------------------
+
+    @Override
+    public V put(final K key, final V value) {
+        if (normalMap.containsKey(key)) {
+            reverseMap.remove(normalMap.get(key));
+        }
+        if (reverseMap.containsKey(value)) {
+            normalMap.remove(reverseMap.get(value));
+        }
+        final V obj = normalMap.put(key, value);
+        reverseMap.put(value, key);
+        return obj;
+    }
+
+    @Override
+    public void putAll(final Map<? extends K, ? extends V> map) {
+        for (final Map.Entry<? extends K, ? extends V> entry : map.entrySet()) {
+            put(entry.getKey(), entry.getValue());
+        }
+    }
+
+    @Override
+    public V remove(final Object key) {
+        V value = null;
+        if (normalMap.containsKey(key)) {
+            value = normalMap.remove(key);
+            reverseMap.remove(value);
+        }
+        return value;
+    }
+
+    @Override
+    public void clear() {
+        normalMap.clear();
+        reverseMap.clear();
+    }
+
+    @Override
+    public boolean containsValue(final Object value) {
+        return reverseMap.containsKey(value);
+    }
+
+    // BidiMap
+    //-----------------------------------------------------------------------
+    /**
+     * Obtains a <code>MapIterator</code> over the map.
+     * The iterator implements <code>ResetableMapIterator</code>.
+     * This implementation relies on the entrySet iterator.
+     * <p>
+     * The setValue() methods only allow a new value to be set.
+     * If the value being set is already in the map, an IllegalArgumentException
+     * is thrown (as setValue cannot change the size of the map).
+     *
+     * @return a map iterator
+     */
+    @Override
+    public MapIterator<K, V> mapIterator() {
+        return new BidiMapIterator<K, V>(this);
+    }
+
+    @Override
+    public K getKey(final Object value) {
+        return reverseMap.get(value);
+    }
+
+    @Override
+    public K removeValue(final Object value) {
+        K key = null;
+        if (reverseMap.containsKey(value)) {
+            key = reverseMap.remove(value);
+            normalMap.remove(key);
+        }
+        return key;
+    }
+
+    @Override
+    public BidiMap<V, K> inverseBidiMap() {
+        if (inverseBidiMap == null) {
+            inverseBidiMap = createBidiMap(reverseMap, normalMap, this);
+        }
+        return inverseBidiMap;
+    }
+
+    // Map views
+    //-----------------------------------------------------------------------
+    /**
+     * Gets a keySet view of the map.
+     * Changes made on the view are reflected in the map.
+     * The set supports remove and clear but not add.
+     *
+     * @return the keySet view
+     */
+    @Override
+    public Set<K> keySet() {
+        if (keySet == null) {
+            keySet = new KeySet<K>(this);
+        }
+        return keySet;
+    }
+
+    /**
+     * Creates a key set iterator.
+     * Subclasses can override this to return iterators with different properties.
+     *
+     * @param iterator  the iterator to decorate
+     * @return the keySet iterator
+     */
+    protected Iterator<K> createKeySetIterator(final Iterator<K> iterator) {
+        return new KeySetIterator<K>(iterator, this);
+    }
+
+    /**
+     * Gets a values view of the map.
+     * Changes made on the view are reflected in the map.
+     * The set supports remove and clear but not add.
+     *
+     * @return the values view
+     */
+    @Override
+    public Set<V> values() {
+        if (values == null) {
+            values = new Values<V>(this);
+        }
+        return values;
+    }
+
+    /**
+     * Creates a values iterator.
+     * Subclasses can override this to return iterators with different properties.
+     *
+     * @param iterator  the iterator to decorate
+     * @return the values iterator
+     */
+    protected Iterator<V> createValuesIterator(final Iterator<V> iterator) {
+        return new ValuesIterator<V>(iterator, this);
+    }
+
+    /**
+     * Gets an entrySet view of the map.
+     * Changes made on the set are reflected in the map.
+     * The set supports remove and clear but not add.
+     * <p>
+     * The Map Entry setValue() method only allow a new value to be set.
+     * If the value being set is already in the map, an IllegalArgumentException
+     * is thrown (as setValue cannot change the size of the map).
+     *
+     * @return the entrySet view
+     */
+    @Override
+    public Set<Map.Entry<K, V>> entrySet() {
+        if (entrySet == null) {
+            entrySet = new EntrySet<K, V>(this);
+        }
+        return entrySet;
+    }
+
+    /**
+     * Creates an entry set iterator.
+     * Subclasses can override this to return iterators with different properties.
+     *
+     * @param iterator  the iterator to decorate
+     * @return the entrySet iterator
+     */
+    protected Iterator<Map.Entry<K, V>> createEntrySetIterator(final Iterator<Map.Entry<K, V>> iterator) {
+        return new EntrySetIterator<K, V>(iterator, this);
+    }
+
+    //-----------------------------------------------------------------------
+    /**
+     * Inner class View.
+     */
+    protected static abstract class View<K, V, E> extends AbstractCollectionDecorator<E> {
+
+        /** Generated serial version ID. */
+        private static final long serialVersionUID = 4621510560119690639L;
+
+        /** The parent map */
+        protected final AbstractDualBidiMap<K, V> parent;
+
+        /**
+         * Constructs a new view of the BidiMap.
+         *
+         * @param coll  the collection view being decorated
+         * @param parent  the parent BidiMap
+         */
+        protected View(final Collection<E> coll, final AbstractDualBidiMap<K, V> parent) {
+            super(coll);
+            this.parent = parent;
+        }
+
+        @Override
+        public boolean equals(final Object object) {
+            return object == this || decorated().equals(object);
+        }
+
+        @Override
+        public int hashCode() {
+            return decorated().hashCode();
+        }
+
+        @Override
+        public boolean removeAll(final Collection<?> coll) {
+            if (parent.isEmpty() || coll.isEmpty()) {
+                return false;
+            }
+            boolean modified = false;
+            final Iterator<?> it = coll.iterator();
+            while (it.hasNext()) {
+                modified |= remove(it.next());
+            }
+            return modified;
+        }
+
+        /**
+         * {@inheritDoc}
+         * <p>
+         * This implementation iterates over the elements of this bidi map, checking each element in
+         * turn to see if it's contained in <code>coll</code>. If it's not contained, it's removed
+         * from this bidi map. As a consequence, it is advised to use a collection type for
+         * <code>coll</code> that provides a fast (e.g. O(1)) implementation of
+         * {@link Collection#contains(Object)}.
+         */
+        @Override
+        public boolean retainAll(final Collection<?> coll) {
+            if (parent.isEmpty()) {
+                return false;
+            }
+            if (coll.isEmpty()) {
+                parent.clear();
+                return true;
+            }
+            boolean modified = false;
+            final Iterator<E> it = iterator();
+            while (it.hasNext()) {
+                if (coll.contains(it.next()) == false) {
+                    it.remove();
+                    modified = true;
+                }
+            }
+            return modified;
+        }
+
+        @Override
+        public void clear() {
+            parent.clear();
+        }
+    }
+
+    //-----------------------------------------------------------------------
+    /**
+     * Inner class KeySet.
+     */
+    protected static class KeySet<K> extends View<K, Object, K> implements Set<K> {
+
+        /** Serialization version */
+        private static final long serialVersionUID = -7107935777385040694L;
+
+        /**
+         * Constructs a new view of the BidiMap.
+         *
+         * @param parent  the parent BidiMap
+         */
+        @SuppressWarnings("unchecked")
+        protected KeySet(final AbstractDualBidiMap<K, ?> parent) {
+            super(parent.normalMap.keySet(), (AbstractDualBidiMap<K, Object>) parent);
+        }
+
+        @Override
+        public Iterator<K> iterator() {
+            return parent.createKeySetIterator(super.iterator());
+        }
+
+        @Override
+        public boolean contains(final Object key) {
+            return parent.normalMap.containsKey(key);
+        }
+
+        @Override
+        public boolean remove(final Object key) {
+            if (parent.normalMap.containsKey(key)) {
+                final Object value = parent.normalMap.remove(key);
+                parent.reverseMap.remove(value);
+                return true;
+            }
+            return false;
+        }
+    }
+
+    /**
+     * Inner class KeySetIterator.
+     */
+    protected static class KeySetIterator<K> extends AbstractIteratorDecorator<K> {
+
+        /** The parent map */
+        protected final AbstractDualBidiMap<K, ?> parent;
+
+        /** The last returned key */
+        protected K lastKey = null;
+
+        /** Whether remove is allowed at present */
+        protected boolean canRemove = false;
+
+        /**
+         * Constructor.
+         * @param iterator  the iterator to decorate
+         * @param parent  the parent map
+         */
+        protected KeySetIterator(final Iterator<K> iterator, final AbstractDualBidiMap<K, ?> parent) {
+            super(iterator);
+            this.parent = parent;
+        }
+
+        @Override
+        public K next() {
+            lastKey = super.next();
+            canRemove = true;
+            return lastKey;
+        }
+
+        @Override
+        public void remove() {
+            if (canRemove == false) {
+                throw new IllegalStateException("Iterator remove() can only be called once after next()");
+            }
+            final Object value = parent.normalMap.get(lastKey);
+            super.remove();
+            parent.reverseMap.remove(value);
+            lastKey = null;
+            canRemove = false;
+        }
+    }
+
+    //-----------------------------------------------------------------------
+    /**
+     * Inner class Values.
+     */
+    protected static class Values<V> extends View<Object, V, V> implements Set<V> {
+
+        /** Serialization version */
+        private static final long serialVersionUID = 4023777119829639864L;
+
+        /**
+         * Constructs a new view of the BidiMap.
+         *
+         * @param parent  the parent BidiMap
+         */
+        @SuppressWarnings("unchecked")
+        protected Values(final AbstractDualBidiMap<?, V> parent) {
+            super(parent.normalMap.values(), (AbstractDualBidiMap<Object, V>) parent);
+        }
+
+        @Override
+        public Iterator<V> iterator() {
+            return parent.createValuesIterator(super.iterator());
+        }
+
+        @Override
+        public boolean contains(final Object value) {
+            return parent.reverseMap.containsKey(value);
+        }
+
+        @Override
+        public boolean remove(final Object value) {
+            if (parent.reverseMap.containsKey(value)) {
+                final Object key = parent.reverseMap.remove(value);
+                parent.normalMap.remove(key);
+                return true;
+            }
+            return false;
+        }
+    }
+
+    /**
+     * Inner class ValuesIterator.
+     */
+    protected static class ValuesIterator<V> extends AbstractIteratorDecorator<V> {
+
+        /** The parent map */
+        protected final AbstractDualBidiMap<Object, V> parent;
+
+        /** The last returned value */
+        protected V lastValue = null;
+
+        /** Whether remove is allowed at present */
+        protected boolean canRemove = false;
+
+        /**
+         * Constructor.
+         * @param iterator  the iterator to decorate
+         * @param parent  the parent map
+         */
+        @SuppressWarnings("unchecked")
+        protected ValuesIterator(final Iterator<V> iterator, final AbstractDualBidiMap<?, V> parent) {
+            super(iterator);
+            this.parent = (AbstractDualBidiMap<Object, V>) parent;
+        }
+
+        @Override
+        public V next() {
+            lastValue = super.next();
+            canRemove = true;
+            return lastValue;
+        }
+
+        @Override
+        public void remove() {
+            if (canRemove == false) {
+                throw new IllegalStateException("Iterator remove() can only be called once after next()");
+            }
+            super.remove(); // removes from maps[0]
+            parent.reverseMap.remove(lastValue);
+            lastValue = null;
+            canRemove = false;
+        }
+    }
+
+    //-----------------------------------------------------------------------
+    /**
+     * Inner class EntrySet.
+     */
+    protected static class EntrySet<K, V> extends View<K, V, Map.Entry<K, V>> implements Set<Map.Entry<K, V>> {
+
+        /** Serialization version */
+        private static final long serialVersionUID = 4040410962603292348L;
+
+        /**
+         * Constructs a new view of the BidiMap.
+         *
+         * @param parent  the parent BidiMap
+         */
+        protected EntrySet(final AbstractDualBidiMap<K, V> parent) {
+            super(parent.normalMap.entrySet(), parent);
+        }
+
+        @Override
+        public Iterator<Map.Entry<K, V>> iterator() {
+            return parent.createEntrySetIterator(super.iterator());
+        }
+
+        @Override
+        public boolean remove(final Object obj) {
+            if (obj instanceof Map.Entry == false) {
+                return false;
+            }
+            final Map.Entry<?, ?> entry = (Map.Entry<?, ?>) obj;
+            final Object key = entry.getKey();
+            if (parent.containsKey(key)) {
+                final V value = parent.normalMap.get(key);
+                if (value == null ? entry.getValue() == null : value.equals(entry.getValue())) {
+                    parent.normalMap.remove(key);
+                    parent.reverseMap.remove(value);
+                    return true;
+                }
+            }
+            return false;
+        }
+    }
+
+    /**
+     * Inner class EntrySetIterator.
+     */
+    protected static class EntrySetIterator<K, V> extends AbstractIteratorDecorator<Map.Entry<K, V>> {
+
+        /** The parent map */
+        protected final AbstractDualBidiMap<K, V> parent;
+
+        /** The last returned entry */
+        protected Map.Entry<K, V> last = null;
+
+        /** Whether remove is allowed at present */
+        protected boolean canRemove = false;
+
+        /**
+         * Constructor.
+         * @param iterator  the iterator to decorate
+         * @param parent  the parent map
+         */
+        protected EntrySetIterator(final Iterator<Map.Entry<K, V>> iterator, final AbstractDualBidiMap<K, V> parent) {
+            super(iterator);
+            this.parent = parent;
+        }
+
+        @Override
+        public Map.Entry<K, V> next() {
+            last = new MapEntry<K, V>(super.next(), parent);
+            canRemove = true;
+            return last;
+        }
+
+        @Override
+        public void remove() {
+            if (canRemove == false) {
+                throw new IllegalStateException("Iterator remove() can only be called once after next()");
+            }
+            // store value as remove may change the entry in the decorator (eg.TreeMap)
+            final Object value = last.getValue();
+            super.remove();
+            parent.reverseMap.remove(value);
+            last = null;
+            canRemove = false;
+        }
+    }
+
+    /**
+     * Inner class MapEntry.
+     */
+    protected static class MapEntry<K, V> extends AbstractMapEntryDecorator<K, V> {
+
+        /** The parent map */
+        protected final AbstractDualBidiMap<K, V> parent;
+
+        /**
+         * Constructor.
+         * @param entry  the entry to decorate
+         * @param parent  the parent map
+         */
+        protected MapEntry(final Map.Entry<K, V> entry, final AbstractDualBidiMap<K, V> parent) {
+            super(entry);
+            this.parent = parent;
+        }
+
+        @Override
+        public V setValue(final V value) {
+            final K key = MapEntry.this.getKey();
+            if (parent.reverseMap.containsKey(value) &&
+                parent.reverseMap.get(value) != key) {
+                throw new IllegalArgumentException(
+                        "Cannot use setValue() when the object being set is already in the map");
+            }
+            parent.put(key, value);
+            return super.setValue(value);
+        }
+    }
+
+    /**
+     * Inner class MapIterator.
+     */
+    protected static class BidiMapIterator<K, V> implements MapIterator<K, V>, ResettableIterator<K> {
+
+        /** The parent map */
+        protected final AbstractDualBidiMap<K, V> parent;
+
+        /** The iterator being wrapped */
+        protected Iterator<Map.Entry<K, V>> iterator;
+
+        /** The last returned entry */
+        protected Map.Entry<K, V> last = null;
+
+        /** Whether remove is allowed at present */
+        protected boolean canRemove = false;
+
+        /**
+         * Constructor.
+         * @param parent  the parent map
+         */
+        protected BidiMapIterator(final AbstractDualBidiMap<K, V> parent) {
+            super();
+            this.parent = parent;
+            this.iterator = parent.normalMap.entrySet().iterator();
+        }
+
+        @Override
+        public boolean hasNext() {
+            return iterator.hasNext();
+        }
+
+        @Override
+        public K next() {
+            last = iterator.next();
+            canRemove = true;
+            return last.getKey();
+        }
+
+        @Override
+        public void remove() {
+            if (canRemove == false) {
+                throw new IllegalStateException("Iterator remove() can only be called once after next()");
+            }
+            // store value as remove may change the entry in the decorator (eg.TreeMap)
+            final V value = last.getValue();
+            iterator.remove();
+            parent.reverseMap.remove(value);
+            last = null;
+            canRemove = false;
+        }
+
+        @Override
+        public K getKey() {
+            if (last == null) {
+                throw new IllegalStateException(
+                        "Iterator getKey() can only be called after next() and before remove()");
+            }
+            return last.getKey();
+        }
+
+        @Override
+        public V getValue() {
+            if (last == null) {
+                throw new IllegalStateException(
+                        "Iterator getValue() can only be called after next() and before remove()");
+            }
+            return last.getValue();
+        }
+
+        @Override
+        public V setValue(final V value) {
+            if (last == null) {
+                throw new IllegalStateException(
+                        "Iterator setValue() can only be called after next() and before remove()");
+            }
+            if (parent.reverseMap.containsKey(value) &&
+                parent.reverseMap.get(value) != last.getKey()) {
+                throw new IllegalArgumentException(
+                        "Cannot use setValue() when the object being set is already in the map");
+            }
+            return parent.put(last.getKey(), value);
+        }
+
+        @Override
+        public void reset() {
+            iterator = parent.normalMap.entrySet().iterator();
+            last = null;
+            canRemove = false;
+        }
+
+        @Override
+        public String toString() {
+            if (last != null) {
+                return "MapIterator[" + getKey() + "=" + getValue() + "]";
+            }
+            return "MapIterator[]";
+        }
+    }
+
+}

fine-commons-collections4/src/com/fr/third/org/apache/commons/collections4/bidimap/AbstractOrderedBidiMapDecorator.java

@@ -0,0 +1,92 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.fr.third.org.apache.commons.collections4.bidimap;
+
+import com.fr.third.org.apache.commons.collections4.OrderedBidiMap;
+import com.fr.third.org.apache.commons.collections4.OrderedMapIterator;
+
+/**
+ * Provides a base decorator that enables additional functionality to be added
+ * to an OrderedBidiMap via decoration.
+ * <p>
+ * Methods are forwarded directly to the decorated map.
+ * <p>
+ * This implementation does not perform any special processing with the map views.
+ * Instead it simply returns the inverse from the wrapped map. This may be
+ * undesirable, for example if you are trying to write a validating implementation
+ * it would provide a loophole around the validation.
+ * But, you might want that loophole, so this class is kept simple.
+ *
+ * @since 3.0
+ * @version $Id: AbstractOrderedBidiMapDecorator.java 1686855 2015-06-22 13:00:27Z tn $
+ */
+public abstract class AbstractOrderedBidiMapDecorator<K, V>
+        extends AbstractBidiMapDecorator<K, V>
+        implements OrderedBidiMap<K, V> {
+
+    /**
+     * Constructor that wraps (not copies).
+     *
+     * @param map  the map to decorate, must not be null
+     * @throws NullPointerException if the collection is null
+     */
+    protected AbstractOrderedBidiMapDecorator(final OrderedBidiMap<K, V> map) {
+        super(map);
+    }
+
+    /**
+     * Gets the map being decorated.
+     *
+     * @return the decorated map
+     */
+    @Override
+    protected OrderedBidiMap<K, V> decorated() {
+        return (OrderedBidiMap<K, V>) super.decorated();
+    }
+
+    //-----------------------------------------------------------------------
+    @Override
+    public OrderedMapIterator<K, V> mapIterator() {
+        return decorated().mapIterator();
+    }
+
+    @Override
+    public K firstKey() {
+        return decorated().firstKey();
+    }
+
+    @Override
+    public K lastKey() {
+        return decorated().lastKey();
+    }
+
+    @Override
+    public K nextKey(final K key) {
+        return decorated().nextKey(key);
+    }
+
+    @Override
+    public K previousKey(final K key) {
+        return decorated().previousKey(key);
+    }
+
+    @Override
+    public OrderedBidiMap<V, K> inverseBidiMap() {
+        return decorated().inverseBidiMap();
+    }
+
+}

fine-commons-collections4/src/com/fr/third/org/apache/commons/collections4/bidimap/AbstractSortedBidiMapDecorator.java

@@ -0,0 +1,93 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.fr.third.org.apache.commons.collections4.bidimap;
+
+import java.util.Comparator;
+import java.util.SortedMap;
+
+import com.fr.third.org.apache.commons.collections4.SortedBidiMap;
+
+/**
+ * Provides a base decorator that enables additional functionality to be added
+ * to a SortedBidiMap via decoration.
+ * <p>
+ * Methods are forwarded directly to the decorated map.
+ * <p>
+ * This implementation does not perform any special processing with the map views.
+ * Instead it simply returns the inverse from the wrapped map. This may be
+ * undesirable, for example if you are trying to write a validating implementation
+ * it would provide a loophole around the validation.
+ * But, you might want that loophole, so this class is kept simple.
+ *
+ * @since 3.0
+ * @version $Id: AbstractSortedBidiMapDecorator.java 1686855 2015-06-22 13:00:27Z tn $
+ */
+public abstract class AbstractSortedBidiMapDecorator<K, V>
+        extends AbstractOrderedBidiMapDecorator<K, V> implements SortedBidiMap<K, V> {
+
+    /**
+     * Constructor that wraps (not copies).
+     *
+     * @param map  the map to decorate, must not be null
+     * @throws NullPointerException if the collection is null
+     */
+    public AbstractSortedBidiMapDecorator(final SortedBidiMap<K, V> map) {
+        super(map);
+    }
+
+    /**
+     * Gets the map being decorated.
+     *
+     * @return the decorated map
+     */
+    @Override
+    protected SortedBidiMap<K, V> decorated() {
+        return (SortedBidiMap<K, V>) super.decorated();
+    }
+
+    //-----------------------------------------------------------------------
+    @Override
+    public SortedBidiMap<V, K> inverseBidiMap() {
+        return decorated().inverseBidiMap();
+    }
+
+    @Override
+    public Comparator<? super K> comparator() {
+        return decorated().comparator();
+    }
+
+    @Override
+    public Comparator<? super V> valueComparator() {
+        return decorated().valueComparator();
+    }
+
+    @Override
+    public SortedMap<K, V> subMap(final K fromKey, final K toKey) {
+        return decorated().subMap(fromKey, toKey);
+    }
+
+    @Override
+    public SortedMap<K, V> headMap(final K toKey) {
+        return decorated().headMap(toKey);
+    }
+
+    @Override
+    public SortedMap<K, V> tailMap(final K fromKey) {
+        return decorated().tailMap(fromKey);
+    }
+
+}

fine-commons-collections4/src/com/fr/third/org/apache/commons/collections4/bidimap/DualHashBidiMap.java

@@ -0,0 +1,107 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.fr.third.org.apache.commons.collections4.bidimap;
+
+import java.io.IOException;
+import java.io.ObjectInputStream;
+import java.io.ObjectOutputStream;
+import java.io.Serializable;
+import java.util.HashMap;
+import java.util.Map;
+
+import com.fr.third.org.apache.commons.collections4.BidiMap;
+
+/**
+ * Implementation of {@link BidiMap} that uses two {@link HashMap} instances.
+ * <p>
+ * Two {@link HashMap} instances are used in this class.
+ * This provides fast lookups at the expense of storing two sets of map entries.
+ * Commons Collections would welcome the addition of a direct hash-based
+ * implementation of the {@link BidiMap} interface.
+ * <p>
+ * NOTE: From Commons Collections 3.1, all subclasses will use {@link HashMap}
+ * and the flawed <code>createMap</code> method is ignored.
+ *
+ * @since 3.0
+ * @version $Id: DualHashBidiMap.java 1533984 2013-10-20 21:12:51Z tn $
+ */
+public class DualHashBidiMap<K, V> extends AbstractDualBidiMap<K, V> implements Serializable {
+
+    /** Ensure serialization compatibility */
+    private static final long serialVersionUID = 721969328361808L;
+
+    /**
+     * Creates an empty <code>HashBidiMap</code>.
+     */
+    public DualHashBidiMap() {
+        super(new HashMap<K, V>(), new HashMap<V, K>());
+    }
+
+    /**
+     * Constructs a <code>HashBidiMap</code> and copies the mappings from
+     * specified <code>Map</code>.
+     *
+     * @param map  the map whose mappings are to be placed in this map
+     */
+    public DualHashBidiMap(final Map<? extends K, ? extends V> map) {
+        super(new HashMap<K, V>(), new HashMap<V, K>());
+        putAll(map);
+    }
+
+    /**
+     * Constructs a <code>HashBidiMap</code> that decorates the specified maps.
+     *
+     * @param normalMap  the normal direction map
+     * @param reverseMap  the reverse direction map
+     * @param inverseBidiMap  the inverse BidiMap
+     */
+    protected DualHashBidiMap(final Map<K, V> normalMap, final Map<V, K> reverseMap,
+                              final BidiMap<V, K> inverseBidiMap) {
+        super(normalMap, reverseMap, inverseBidiMap);
+    }
+
+    /**
+     * Creates a new instance of this object.
+     *
+     * @param normalMap  the normal direction map
+     * @param reverseMap  the reverse direction map
+     * @param inverseBidiMap  the inverse BidiMap
+     * @return new bidi map
+     */
+    @Override
+    protected BidiMap<V, K> createBidiMap(final Map<V, K> normalMap, final Map<K, V> reverseMap,
+                                          final BidiMap<K, V> inverseBidiMap) {
+        return new DualHashBidiMap<V, K>(normalMap, reverseMap, inverseBidiMap);
+    }
+
+    // Serialization
+    //-----------------------------------------------------------------------
+    private void writeObject(final ObjectOutputStream out) throws IOException {
+        out.defaultWriteObject();
+        out.writeObject(normalMap);
+    }
+
+    private void readObject(final ObjectInputStream in) throws IOException, ClassNotFoundException {
+        in.defaultReadObject();
+        normalMap = new HashMap<K, V>();
+        reverseMap = new HashMap<V, K>();
+        @SuppressWarnings("unchecked") // will fail at runtime if stream is incorrect
+        final Map<K, V> map = (Map<K, V>) in.readObject();
+        putAll(map);
+    }
+
+}

fine-commons-collections4/src/com/fr/third/org/apache/commons/collections4/bidimap/DualLinkedHashBidiMap.java

@@ -0,0 +1,101 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.fr.third.org.apache.commons.collections4.bidimap;
+
+import java.io.IOException;
+import java.io.ObjectInputStream;
+import java.io.ObjectOutputStream;
+import java.io.Serializable;
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+import com.fr.third.org.apache.commons.collections4.BidiMap;
+
+/**
+ * Implementation of <code>BidiMap</code> that uses two <code>LinkedHashMap</code> instances.
+ * <p>
+ * Two <code>LinkedHashMap</code> instances are used in this class.
+ * This provides fast lookups at the expense of storing two sets of map entries and two linked lists.
+ *
+ * @version $Id: DualLinkedHashBidiMap.java 1533984 2013-10-20 21:12:51Z tn $
+ * @since 4.0
+ */
+public class DualLinkedHashBidiMap<K, V> extends AbstractDualBidiMap<K, V> implements Serializable {
+
+    /** Ensure serialization compatibility */
+    private static final long serialVersionUID = 721969328361810L;
+
+    /**
+     * Creates an empty <code>HashBidiMap</code>.
+     */
+    public DualLinkedHashBidiMap() {
+        super(new LinkedHashMap<K, V>(), new LinkedHashMap<V, K>());
+    }
+
+    /**
+     * Constructs a <code>LinkedHashBidiMap</code> and copies the mappings from
+     * specified <code>Map</code>.
+     *
+     * @param map the map whose mappings are to be placed in this map
+     */
+    public DualLinkedHashBidiMap(final Map<? extends K, ? extends V> map) {
+        super(new LinkedHashMap<K, V>(), new LinkedHashMap<V, K>());
+        putAll(map);
+    }
+
+    /**
+     * Constructs a <code>LinkedHashBidiMap</code> that decorates the specified maps.
+     *
+     * @param normalMap      the normal direction map
+     * @param reverseMap     the reverse direction map
+     * @param inverseBidiMap the inverse BidiMap
+     */
+    protected DualLinkedHashBidiMap(final Map<K, V> normalMap, final Map<V, K> reverseMap,
+                                    final BidiMap<V, K> inverseBidiMap) {
+        super(normalMap, reverseMap, inverseBidiMap);
+    }
+
+    /**
+     * Creates a new instance of this object.
+     *
+     * @param normalMap      the normal direction map
+     * @param reverseMap     the reverse direction map
+     * @param inverseBidiMap the inverse BidiMap
+     * @return new bidi map
+     */
+    @Override
+    protected BidiMap<V, K> createBidiMap(final Map<V, K> normalMap, final Map<K, V> reverseMap,
+            final BidiMap<K, V> inverseBidiMap) {
+        return new DualLinkedHashBidiMap<V, K>(normalMap, reverseMap, inverseBidiMap);
+    }
+
+    // Serialization
+    //-----------------------------------------------------------------------
+    private void writeObject(final ObjectOutputStream out) throws IOException {
+        out.defaultWriteObject();
+        out.writeObject(normalMap);
+    }
+
+    private void readObject(final ObjectInputStream in) throws IOException, ClassNotFoundException {
+        in.defaultReadObject();
+        normalMap = new LinkedHashMap<K, V>();
+        reverseMap = new LinkedHashMap<V, K>();
+        @SuppressWarnings("unchecked") // will fail at runtime if stream is incorrect
+        final Map<K, V> map = (Map<K, V>) in.readObject();
+        putAll(map);
+    }
+}

fine-commons-collections4/src/com/fr/third/org/apache/commons/collections4/bidimap/DualTreeBidiMap.java

@@ -0,0 +1,416 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.fr.third.org.apache.commons.collections4.bidimap;
+
+import java.io.IOException;
+import java.io.ObjectInputStream;
+import java.io.ObjectOutputStream;
+import java.io.Serializable;
+import java.util.ArrayList;
+import java.util.Comparator;
+import java.util.Iterator;
+import java.util.ListIterator;
+import java.util.Map;
+import java.util.SortedMap;
+import java.util.TreeMap;
+
+import com.fr.third.org.apache.commons.collections4.BidiMap;
+import com.fr.third.org.apache.commons.collections4.OrderedBidiMap;
+import com.fr.third.org.apache.commons.collections4.OrderedMap;
+import com.fr.third.org.apache.commons.collections4.OrderedMapIterator;
+import com.fr.third.org.apache.commons.collections4.ResettableIterator;
+import com.fr.third.org.apache.commons.collections4.SortedBidiMap;
+import com.fr.third.org.apache.commons.collections4.map.AbstractSortedMapDecorator;
+
+/**
+ * Implementation of {@link BidiMap} that uses two {@link TreeMap} instances.
+ * <p>
+ * The setValue() method on iterators will succeed only if the new value being set is
+ * not already in the bidimap.
+ * <p>
+ * When considering whether to use this class, the {@link TreeBidiMap} class should
+ * also be considered. It implements the interface using a dedicated design, and does
+ * not store each object twice, which can save on memory use.
+ * <p>
+ * NOTE: From Commons Collections 3.1, all subclasses will use {@link TreeMap}
+ * and the flawed <code>createMap</code> method is ignored.
+ *
+ * @since 3.0
+ * @version $Id: DualTreeBidiMap.java 1683951 2015-06-06 20:19:03Z tn $
+ */
+public class DualTreeBidiMap<K, V> extends AbstractDualBidiMap<K, V>
+        implements SortedBidiMap<K, V>, Serializable {
+
+    /** Ensure serialization compatibility */
+    private static final long serialVersionUID = 721969328361809L;
+
+    /** The key comparator to use */
+    private final Comparator<? super K> comparator;
+
+    /** The value comparator to use */
+    private final Comparator<? super V> valueComparator;
+
+    /**
+     * Creates an empty <code>DualTreeBidiMap</code>
+     */
+    public DualTreeBidiMap() {
+        super(new TreeMap<K, V>(), new TreeMap<V, K>());
+        this.comparator = null;
+        this.valueComparator = null;
+    }
+
+    /**
+     * Constructs a <code>DualTreeBidiMap</code> and copies the mappings from
+     * specified <code>Map</code>.
+     *
+     * @param map  the map whose mappings are to be placed in this map
+     */
+    public DualTreeBidiMap(final Map<? extends K, ? extends V> map) {
+        super(new TreeMap<K, V>(), new TreeMap<V, K>());
+        putAll(map);
+        this.comparator = null;
+        this.valueComparator = null;
+    }
+
+    /**
+     * Constructs a {@link DualTreeBidiMap} using the specified {@link Comparator}.
+     *
+     * @param keyComparator  the comparator
+     * @param valueComparator  the values comparator to use
+     */
+    public DualTreeBidiMap(final Comparator<? super K> keyComparator, final Comparator<? super V> valueComparator) {
+        super(new TreeMap<K, V>(keyComparator), new TreeMap<V, K>(valueComparator));
+        this.comparator = keyComparator;
+        this.valueComparator = valueComparator;
+    }
+
+    /**
+     * Constructs a {@link DualTreeBidiMap} that decorates the specified maps.
+     *
+     * @param normalMap  the normal direction map
+     * @param reverseMap  the reverse direction map
+     * @param inverseBidiMap  the inverse BidiMap
+     */
+    protected DualTreeBidiMap(final Map<K, V> normalMap, final Map<V, K> reverseMap,
+                              final BidiMap<V, K> inverseBidiMap) {
+        super(normalMap, reverseMap, inverseBidiMap);
+        this.comparator = ((SortedMap<K, V>) normalMap).comparator();
+        this.valueComparator = ((SortedMap<V, K>) reverseMap).comparator();
+    }
+
+    /**
+     * Creates a new instance of this object.
+     *
+     * @param normalMap  the normal direction map
+     * @param reverseMap  the reverse direction map
+     * @param inverseMap  the inverse BidiMap
+     * @return new bidi map
+     */
+    @Override
+    protected DualTreeBidiMap<V, K> createBidiMap(final Map<V, K> normalMap, final Map<K, V> reverseMap,
+                                                  final BidiMap<K, V> inverseMap) {
+        return new DualTreeBidiMap<V, K>(normalMap, reverseMap, inverseMap);
+    }
+
+    //-----------------------------------------------------------------------
+
+    @Override
+    public Comparator<? super K> comparator() {
+        return ((SortedMap<K, V>) normalMap).comparator();
+    }
+
+    @Override
+    public Comparator<? super V> valueComparator() {
+        return ((SortedMap<V, K>) reverseMap).comparator();
+    }
+
+    @Override
+    public K firstKey() {
+        return ((SortedMap<K, V>) normalMap).firstKey();
+    }
+
+    @Override
+    public K lastKey() {
+        return ((SortedMap<K, V>) normalMap).lastKey();
+    }
+
+    @Override
+    public K nextKey(final K key) {
+        if (isEmpty()) {
+            return null;
+        }
+        if (normalMap instanceof OrderedMap) {
+            return ((OrderedMap<K, ?>) normalMap).nextKey(key);
+        }
+        final SortedMap<K, V> sm = (SortedMap<K, V>) normalMap;
+        final Iterator<K> it = sm.tailMap(key).keySet().iterator();
+        it.next();
+        if (it.hasNext()) {
+            return it.next();
+        }
+        return null;
+    }
+
+    @Override
+    public K previousKey(final K key) {
+        if (isEmpty()) {
+            return null;
+        }
+        if (normalMap instanceof OrderedMap) {
+            return ((OrderedMap<K, V>) normalMap).previousKey(key);
+        }
+        final SortedMap<K, V> sm = (SortedMap<K, V>) normalMap;
+        final SortedMap<K, V> hm = sm.headMap(key);
+        if (hm.isEmpty()) {
+            return null;
+        }
+        return hm.lastKey();
+    }
+
+    //-----------------------------------------------------------------------
+    /**
+     * Obtains an ordered map iterator.
+     * <p>
+     * This implementation copies the elements to an ArrayList in order to
+     * provide the forward/backward behaviour.
+     *
+     * @return a new ordered map iterator
+     */
+    @Override
+    public OrderedMapIterator<K, V> mapIterator() {
+        return new BidiOrderedMapIterator<K, V>(this);
+    }
+
+    public SortedBidiMap<V, K> inverseSortedBidiMap() {
+        return inverseBidiMap();
+    }
+
+    public OrderedBidiMap<V, K> inverseOrderedBidiMap() {
+        return inverseBidiMap();
+    }
+
+    //-----------------------------------------------------------------------
+
+    @Override
+    public SortedMap<K, V> headMap(final K toKey) {
+        final SortedMap<K, V> sub = ((SortedMap<K, V>) normalMap).headMap(toKey);
+        return new ViewMap<K, V>(this, sub);
+    }
+
+    @Override
+    public SortedMap<K, V> tailMap(final K fromKey) {
+        final SortedMap<K, V> sub = ((SortedMap<K, V>) normalMap).tailMap(fromKey);
+        return new ViewMap<K, V>(this, sub);
+    }
+
+    @Override
+    public SortedMap<K, V> subMap(final K fromKey, final K toKey) {
+        final SortedMap<K, V> sub = ((SortedMap<K, V>) normalMap).subMap(fromKey, toKey);
+        return new ViewMap<K, V>(this, sub);
+    }
+
+    @Override
+    public SortedBidiMap<V, K> inverseBidiMap() {
+        return (SortedBidiMap<V, K>) super.inverseBidiMap();
+    }
+
+    //-----------------------------------------------------------------------
+    /**
+     * Internal sorted map view.
+     */
+    protected static class ViewMap<K, V> extends AbstractSortedMapDecorator<K, V> {
+        /**
+         * Constructor.
+         * @param bidi  the parent bidi map
+         * @param sm  the subMap sorted map
+         */
+        protected ViewMap(final DualTreeBidiMap<K, V> bidi, final SortedMap<K, V> sm) {
+            // the implementation is not great here...
+            // use the normalMap as the filtered map, but reverseMap as the full map
+            // this forces containsValue and clear to be overridden
+            super(new DualTreeBidiMap<K, V>(sm, bidi.reverseMap, bidi.inverseBidiMap));
+        }
+
+        @Override
+        public boolean containsValue(final Object value) {
+            // override as default implementation uses reverseMap
+            return decorated().normalMap.containsValue(value);
+        }
+
+        @Override
+        public void clear() {
+            // override as default implementation uses reverseMap
+            for (final Iterator<K> it = keySet().iterator(); it.hasNext();) {
+                it.next();
+                it.remove();
+            }
+        }
+
+        @Override
+        public SortedMap<K, V> headMap(final K toKey) {
+            return new ViewMap<K, V>(decorated(), super.headMap(toKey));
+        }
+
+        @Override
+        public SortedMap<K, V> tailMap(final K fromKey) {
+            return new ViewMap<K, V>(decorated(), super.tailMap(fromKey));
+        }
+
+        @Override
+        public SortedMap<K, V> subMap(final K fromKey, final K toKey) {
+            return new ViewMap<K, V>(decorated(), super.subMap(fromKey, toKey));
+        }
+
+        @Override
+        protected DualTreeBidiMap<K, V> decorated() {
+            return (DualTreeBidiMap<K, V>) super.decorated();
+        }
+
+        @Override
+        public K previousKey(final K key) {
+            return decorated().previousKey(key);
+        }
+
+        @Override
+        public K nextKey(final K key) {
+            return decorated().nextKey(key);
+        }
+    }
+
+    //-----------------------------------------------------------------------
+    /**
+     * Inner class MapIterator.
+     */
+    protected static class BidiOrderedMapIterator<K, V> implements OrderedMapIterator<K, V>, ResettableIterator<K> {
+
+        /** The parent map */
+        private final AbstractDualBidiMap<K, V> parent;
+
+        /** The iterator being decorated */
+        private ListIterator<Map.Entry<K, V>> iterator;
+
+        /** The last returned entry */
+        private Map.Entry<K, V> last = null;
+
+        /**
+         * Constructor.
+         * @param parent  the parent map
+         */
+        protected BidiOrderedMapIterator(final AbstractDualBidiMap<K, V> parent) {
+            super();
+            this.parent = parent;
+            iterator = new ArrayList<Map.Entry<K, V>>(parent.entrySet()).listIterator();
+        }
+
+        @Override
+        public boolean hasNext() {
+            return iterator.hasNext();
+        }
+
+        @Override
+        public K next() {
+            last = iterator.next();
+            return last.getKey();
+        }
+
+        @Override
+        public boolean hasPrevious() {
+            return iterator.hasPrevious();
+        }
+
+        @Override
+        public K previous() {
+            last = iterator.previous();
+            return last.getKey();
+        }
+
+        @Override
+        public void remove() {
+            iterator.remove();
+            parent.remove(last.getKey());
+            last = null;
+        }
+
+        @Override
+        public K getKey() {
+            if (last == null) {
+                throw new IllegalStateException(
+                        "Iterator getKey() can only be called after next() and before remove()");
+            }
+            return last.getKey();
+        }
+
+        @Override
+        public V getValue() {
+            if (last == null) {
+                throw new IllegalStateException(
+                        "Iterator getValue() can only be called after next() and before remove()");
+            }
+            return last.getValue();
+        }
+
+        @Override
+        public V setValue(final V value) {
+            if (last == null) {
+                throw new IllegalStateException(
+                        "Iterator setValue() can only be called after next() and before remove()");
+            }
+            if (parent.reverseMap.containsKey(value) &&
+                parent.reverseMap.get(value) != last.getKey()) {
+                throw new IllegalArgumentException(
+                        "Cannot use setValue() when the object being set is already in the map");
+            }
+            final V oldValue = parent.put(last.getKey(), value);
+            // Map.Entry specifies that the behavior is undefined when the backing map
+            // has been modified (as we did with the put), so we also set the value
+            // (especially needed for IBM JDK)
+            last.setValue(value);
+            return oldValue;
+        }
+
+        @Override
+        public void reset() {
+            iterator = new ArrayList<Map.Entry<K, V>>(parent.entrySet()).listIterator();
+            last = null;
+        }
+
+        @Override
+        public String toString() {
+            if (last != null) {
+                return "MapIterator[" + getKey() + "=" + getValue() + "]";
+            }
+            return "MapIterator[]";
+        }
+    }
+
+    // Serialization
+    //-----------------------------------------------------------------------
+    private void writeObject(final ObjectOutputStream out) throws IOException {
+        out.defaultWriteObject();
+        out.writeObject(normalMap);
+    }
+
+    private void readObject(final ObjectInputStream in) throws IOException, ClassNotFoundException {
+        in.defaultReadObject();
+        normalMap = new TreeMap<K, V>(comparator);
+        reverseMap = new TreeMap<V, K>(valueComparator);
+        @SuppressWarnings("unchecked") // will fail at runtime if the stream is incorrect
+        final Map<K, V> map = (Map<K, V>) in.readObject();
+        putAll(map);
+    }
+
+}

fine-commons-collections4/src/com/fr/third/org/apache/commons/collections4/bidimap/UnmodifiableBidiMap.java

@@ -0,0 +1,136 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.fr.third.org.apache.commons.collections4.bidimap;
+
+import java.util.Map;
+import java.util.Set;
+
+import com.fr.third.org.apache.commons.collections4.BidiMap;
+import com.fr.third.org.apache.commons.collections4.MapIterator;
+import com.fr.third.org.apache.commons.collections4.Unmodifiable;
+import com.fr.third.org.apache.commons.collections4.iterators.UnmodifiableMapIterator;
+import com.fr.third.org.apache.commons.collections4.map.UnmodifiableEntrySet;
+import com.fr.third.org.apache.commons.collections4.set.UnmodifiableSet;
+
+/**
+ * Decorates another {@link BidiMap} to ensure it can't be altered.
+ * <p>
+ * Attempts to modify it will result in an UnsupportedOperationException.
+ *
+ * @since 3.0
+ * @version $Id: UnmodifiableBidiMap.java 1686855 2015-06-22 13:00:27Z tn $
+ */
+public final class UnmodifiableBidiMap<K, V>
+        extends AbstractBidiMapDecorator<K, V> implements Unmodifiable {
+
+    /** The inverse unmodifiable map */
+    private UnmodifiableBidiMap<V, K> inverse;
+
+    /**
+     * Factory method to create an unmodifiable map.
+     * <p>
+     * If the map passed in is already unmodifiable, it is returned.
+     *
+     * @param <K> the key type
+     * @param <V> the value type
+     * @param map  the map to decorate, must not be null
+     * @return an unmodifiable BidiMap
+     * @throws NullPointerException if map is null
+     * @since 4.0
+     */
+    public static <K, V> BidiMap<K, V> unmodifiableBidiMap(final BidiMap<? extends K, ? extends V> map) {
+        if (map instanceof Unmodifiable) {
+            @SuppressWarnings("unchecked") // safe to upcast
+            final BidiMap<K, V> tmpMap = (BidiMap<K, V>) map;
+            return tmpMap;
+        }
+        return new UnmodifiableBidiMap<K, V>(map);
+    }
+
+    //-----------------------------------------------------------------------
+    /**
+     * Constructor that wraps (not copies).
+     *
+     * @param map  the map to decorate, must not be null
+     * @throws NullPointerException if map is null
+     */
+    @SuppressWarnings("unchecked") // safe to upcast
+    private UnmodifiableBidiMap(final BidiMap<? extends K, ? extends V> map) {
+        super((BidiMap<K, V>) map);
+    }
+
+    //-----------------------------------------------------------------------
+    @Override
+    public void clear() {
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public V put(final K key, final V value) {
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public void putAll(final Map<? extends K, ? extends V> mapToCopy) {
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public V remove(final Object key) {
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public Set<Map.Entry<K, V>> entrySet() {
+        final Set<Map.Entry<K, V>> set = super.entrySet();
+        return UnmodifiableEntrySet.unmodifiableEntrySet(set);
+    }
+
+    @Override
+    public Set<K> keySet() {
+        final Set<K> set = super.keySet();
+        return UnmodifiableSet.unmodifiableSet(set);
+    }
+
+    @Override
+    public Set<V> values() {
+        final Set<V> set = super.values();
+        return UnmodifiableSet.unmodifiableSet(set);
+    }
+
+    //-----------------------------------------------------------------------
+    @Override
+    public K removeValue(final Object value) {
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public MapIterator<K, V> mapIterator() {
+        final MapIterator<K, V> it = decorated().mapIterator();
+        return UnmodifiableMapIterator.unmodifiableMapIterator(it);
+    }
+
+    @Override
+    public synchronized BidiMap<V, K> inverseBidiMap() {
+        if (inverse == null) {
+            inverse = new UnmodifiableBidiMap<V, K>(decorated().inverseBidiMap());
+            inverse.inverse = this;
+        }
+        return inverse;
+    }
+
+}

fine-commons-collections4/src/com/fr/third/org/apache/commons/collections4/bidimap/UnmodifiableOrderedBidiMap.java

@@ -0,0 +1,147 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.fr.third.org.apache.commons.collections4.bidimap;
+
+import java.util.Map;
+import java.util.Set;
+
+import com.fr.third.org.apache.commons.collections4.OrderedBidiMap;
+import com.fr.third.org.apache.commons.collections4.OrderedMapIterator;
+import com.fr.third.org.apache.commons.collections4.Unmodifiable;
+import com.fr.third.org.apache.commons.collections4.iterators.UnmodifiableOrderedMapIterator;
+import com.fr.third.org.apache.commons.collections4.map.UnmodifiableEntrySet;
+import com.fr.third.org.apache.commons.collections4.set.UnmodifiableSet;
+
+/**
+ * Decorates another {@link OrderedBidiMap} to ensure it can't be altered.
+ * <p>
+ * Attempts to modify it will result in an UnsupportedOperationException.
+ *
+ * @since 3.0
+ * @version $Id: UnmodifiableOrderedBidiMap.java 1686855 2015-06-22 13:00:27Z tn $
+ */
+public final class UnmodifiableOrderedBidiMap<K, V>
+        extends AbstractOrderedBidiMapDecorator<K, V> implements Unmodifiable {
+
+    /** The inverse unmodifiable map */
+    private UnmodifiableOrderedBidiMap<V, K> inverse;
+
+    /**
+     * Factory method to create an unmodifiable map.
+     * <p>
+     * If the map passed in is already unmodifiable, it is returned.
+     *
+     * @param <K> the key type
+     * @param <V> the value type
+     * @param map  the map to decorate, must not be null
+     * @return an unmodifiable OrderedBidiMap
+     * @throws NullPointerException if map is null
+     * @since 4.0
+     */
+    public static <K, V> OrderedBidiMap<K, V> unmodifiableOrderedBidiMap(
+            final OrderedBidiMap<? extends K, ? extends V> map) {
+        if (map instanceof Unmodifiable) {
+            @SuppressWarnings("unchecked") // safe to upcast
+            final OrderedBidiMap<K, V> tmpMap = (OrderedBidiMap<K, V>) map;
+            return tmpMap;
+        }
+        return new UnmodifiableOrderedBidiMap<K, V>(map);
+    }
+
+    //-----------------------------------------------------------------------
+    /**
+     * Constructor that wraps (not copies).
+     *
+     * @param map  the map to decorate, must not be null
+     * @throws NullPointerException if map is null
+     */
+    @SuppressWarnings("unchecked") // safe to upcast
+    private UnmodifiableOrderedBidiMap(final OrderedBidiMap<? extends K, ? extends V> map) {
+        super((OrderedBidiMap<K, V>) map);
+    }
+
+    //-----------------------------------------------------------------------
+    @Override
+    public void clear() {
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public V put(final K key, final V value) {
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public void putAll(final Map<? extends K, ? extends V> mapToCopy) {
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public V remove(final Object key) {
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public Set<Map.Entry<K, V>> entrySet() {
+        final Set<Map.Entry<K, V>> set = super.entrySet();
+        return UnmodifiableEntrySet.unmodifiableEntrySet(set);
+    }
+
+    @Override
+    public Set<K> keySet() {
+        final Set<K> set = super.keySet();
+        return UnmodifiableSet.unmodifiableSet(set);
+    }
+
+    @Override
+    public Set<V> values() {
+        final Set<V> set = super.values();
+        return UnmodifiableSet.unmodifiableSet(set);
+    }
+
+    //-----------------------------------------------------------------------
+    @Override
+    public K removeValue(final Object value) {
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public OrderedBidiMap<V, K> inverseBidiMap() {
+        return inverseOrderedBidiMap();
+    }
+
+    //-----------------------------------------------------------------------
+    @Override
+    public OrderedMapIterator<K, V> mapIterator() {
+        final OrderedMapIterator<K, V> it = decorated().mapIterator();
+        return UnmodifiableOrderedMapIterator.unmodifiableOrderedMapIterator(it);
+    }
+
+    /**
+     * Gets an unmodifiable view of this map where the keys and values are reversed.
+     *
+     * @return an inverted unmodifiable bidirectional map
+     */
+    public OrderedBidiMap<V, K> inverseOrderedBidiMap() {
+        if (inverse == null) {
+            inverse = new UnmodifiableOrderedBidiMap<V, K>(decorated().inverseBidiMap());
+            inverse.inverse = this;
+        }
+        return inverse;
+    }
+
+}

fine-commons-collections4/src/com/fr/third/org/apache/commons/collections4/bidimap/UnmodifiableSortedBidiMap.java

@@ -0,0 +1,158 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.fr.third.org.apache.commons.collections4.bidimap;
+
+import java.util.Map;
+import java.util.Set;
+import java.util.SortedMap;
+
+import com.fr.third.org.apache.commons.collections4.OrderedMapIterator;
+import com.fr.third.org.apache.commons.collections4.SortedBidiMap;
+import com.fr.third.org.apache.commons.collections4.Unmodifiable;
+import com.fr.third.org.apache.commons.collections4.iterators.UnmodifiableOrderedMapIterator;
+import com.fr.third.org.apache.commons.collections4.map.UnmodifiableEntrySet;
+import com.fr.third.org.apache.commons.collections4.map.UnmodifiableSortedMap;
+import com.fr.third.org.apache.commons.collections4.set.UnmodifiableSet;
+
+/**
+ * Decorates another {@link SortedBidiMap} to ensure it can't be altered.
+ * <p>
+ * Attempts to modify it will result in an {@link UnsupportedOperationException}.
+ *
+ * @since 3.0
+ * @version $Id: UnmodifiableSortedBidiMap.java 1686855 2015-06-22 13:00:27Z tn $
+ */
+public final class UnmodifiableSortedBidiMap<K, V>
+        extends AbstractSortedBidiMapDecorator<K, V> implements Unmodifiable {
+
+    /** The inverse unmodifiable map */
+    private UnmodifiableSortedBidiMap<V, K> inverse;
+
+    /**
+     * Factory method to create an unmodifiable map.
+     * <p>
+     * If the map passed in is already unmodifiable, it is returned.
+     *
+     * @param <K> the key type
+     * @param <V> the value type
+     * @param map  the map to decorate, must not be null
+     * @return an unmodifiable SortedBidiMap
+     * @throws NullPointerException if map is null
+     * @since 4.0
+     */
+    public static <K, V> SortedBidiMap<K, V> unmodifiableSortedBidiMap(final SortedBidiMap<K, ? extends V> map) {
+        if (map instanceof Unmodifiable) {
+            @SuppressWarnings("unchecked") // safe to upcast
+            final SortedBidiMap<K, V> tmpMap = (SortedBidiMap<K, V>) map;
+            return tmpMap;
+        }
+        return new UnmodifiableSortedBidiMap<K, V>(map);
+    }
+
+    //-----------------------------------------------------------------------
+    /**
+     * Constructor that wraps (not copies).
+     *
+     * @param map  the map to decorate, must not be null
+     * @throws NullPointerException if map is null
+     */
+    @SuppressWarnings("unchecked") // safe to upcast
+    private UnmodifiableSortedBidiMap(final SortedBidiMap<K, ? extends V> map) {
+        super((SortedBidiMap<K, V>) map);
+    }
+
+    //-----------------------------------------------------------------------
+    @Override
+    public void clear() {
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public V put(final K key, final V value) {
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public void putAll(final Map<? extends K, ? extends V> mapToCopy) {
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public V remove(final Object key) {
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public Set<Map.Entry<K, V>> entrySet() {
+        final Set<Map.Entry<K, V>> set = super.entrySet();
+        return UnmodifiableEntrySet.unmodifiableEntrySet(set);
+    }
+
+    @Override
+    public Set<K> keySet() {
+        final Set<K> set = super.keySet();
+        return UnmodifiableSet.unmodifiableSet(set);
+    }
+
+    @Override
+    public Set<V> values() {
+        final Set<V> set = super.values();
+        return UnmodifiableSet.unmodifiableSet(set);
+    }
+
+    //-----------------------------------------------------------------------
+    @Override
+    public K removeValue(final Object value) {
+        throw new UnsupportedOperationException();
+    }
+
+    //-----------------------------------------------------------------------
+    @Override
+    public OrderedMapIterator<K, V> mapIterator() {
+        final OrderedMapIterator<K, V> it = decorated().mapIterator();
+        return UnmodifiableOrderedMapIterator.unmodifiableOrderedMapIterator(it);
+    }
+
+    //-----------------------------------------------------------------------
+    @Override
+    public SortedBidiMap<V, K> inverseBidiMap() {
+        if (inverse == null) {
+            inverse = new UnmodifiableSortedBidiMap<V, K>(decorated().inverseBidiMap());
+            inverse.inverse = this;
+        }
+        return inverse;
+    }
+
+    @Override
+    public SortedMap<K, V> subMap(final K fromKey, final K toKey) {
+        final SortedMap<K, V> sm = decorated().subMap(fromKey, toKey);
+        return UnmodifiableSortedMap.unmodifiableSortedMap(sm);
+    }
+
+    @Override
+    public SortedMap<K, V> headMap(final K toKey) {
+        final SortedMap<K, V> sm = decorated().headMap(toKey);
+        return UnmodifiableSortedMap.unmodifiableSortedMap(sm);
+    }
+
+    @Override
+    public SortedMap<K, V> tailMap(final K fromKey) {
+        final SortedMap<K, V> sm = decorated().tailMap(fromKey);
+        return UnmodifiableSortedMap.unmodifiableSortedMap(sm);
+    }
+
+}

fine-commons-collections4/src/com/fr/third/org/apache/commons/collections4/bidimap/package-info.java

@@ -0,0 +1,41 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+/**
+ * This package contains implementations of the
+ * {@link org.apache.commons.collections4.BidiMap BidiMap},
+ * {@link org.apache.commons.collections4.OrderedBidiMap OrderedBidiMap} and
+ * {@link org.apache.commons.collections4.SortedBidiMap SortedBidiMap} interfaces.
+ * A BidiMap is an extension to Map that allows keys and values to be looked up with equal ease.
+ * One example usage is a system communicating to a legacy datasource that must convert codes
+ * from the new format to the old format and vice versa.
+ * <p>
+ * The following implementations are provided in the package:
+ * <ul>
+ *   <li>DualHashBidiMap - uses two HashMaps to implement BidiMap
+ *   <li>DualLinkedHashBidiMap - uses two LinkedHashMaps to implement BidiMap
+ *   <li>DualTreeBidiMap - uses two TreeMaps to implement SortedBidiMap
+ *   <li>TreeBidiMap - red-black tree implementation of OrderedBidiMap
+ * </ul>
+ * <p>
+ * The following decorators are provided in the package:
+ * <ul>
+ *   <li>Unmodifiable - ensures the map cannot be altered
+ * </ul>
+ *
+ * @version $Id: package-info.java 1477745 2013-04-30 18:08:32Z tn $
+ */
+package com.fr.third.org.apache.commons.collections4.bidimap;

fine-commons-collections4/src/com/fr/third/org/apache/commons/collections4/collection/AbstractCollectionDecorator.java

@@ -0,0 +1,178 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.fr.third.org.apache.commons.collections4.collection;
+
+import java.io.Serializable;
+import java.util.Collection;
+import java.util.Iterator;
+
+/**
+ * Decorates another <code>Collection</code> to provide additional behaviour.
+ * <p>
+ * Each method call made on this <code>Collection</code> is forwarded to the
+ * decorated <code>Collection</code>. This class is used as a framework on which
+ * to build to extensions such as synchronized and unmodifiable behaviour. The
+ * main advantage of decoration is that one decorator can wrap any implementation
+ * of <code>Collection</code>, whereas sub-classing requires a new class to be
+ * written for each implementation.
+ * <p>
+ * This implementation does not perform any special processing with
+ * {@link #iterator()}. Instead it simply returns the value from the
+ * wrapped collection. This may be undesirable, for example if you are trying
+ * to write an unmodifiable implementation it might provide a loophole.
+ * <p>
+ * This implementation does not forward the hashCode and equals methods through
+ * to the backing object, but relies on Object's implementation. This is necessary
+ * to preserve the symmetry of equals. Custom definitions of equality are usually
+ * based on an interface, such as Set or List, so that the implementation of equals
+ * can cast the object being tested for equality to the custom interface.
+ * AbstractCollectionDecorator does not implement such custom interfaces directly;
+ * they are implemented only in subclasses. Therefore, forwarding equals would break
+ * symmetry, as the forwarding object might consider itself equal to the object being
+ * tested, but the reverse could not be true. This behavior is consistent with the
+ * JDK's collection wrappers, such as {@link java.util.Collections#unmodifiableCollection(Collection)}.
+ * Use an interface-specific subclass of AbstractCollectionDecorator, such as
+ * AbstractListDecorator, to preserve equality behavior, or override equals directly.
+ *
+ * @param <E> the type of the elements in the collection
+ * @since 3.0
+ * @version $Id: AbstractCollectionDecorator.java 1686855 2015-06-22 13:00:27Z tn $
+ */
+public abstract class AbstractCollectionDecorator<E>
+        implements Collection<E>, Serializable {
+
+    /** Serialization version */
+    private static final long serialVersionUID = 6249888059822088500L;
+
+    /** The collection being decorated */
+    private Collection<E> collection;
+
+    /**
+     * Constructor only used in deserialization, do not use otherwise.
+     * @since 3.1
+     */
+    protected AbstractCollectionDecorator() {
+        super();
+    }
+
+    /**
+     * Constructor that wraps (not copies).
+     *
+     * @param coll  the collection to decorate, must not be null
+     * @throws NullPointerException if the collection is null
+     */
+    protected AbstractCollectionDecorator(final Collection<E> coll) {
+        if (coll == null) {
+            throw new NullPointerException("Collection must not be null.");
+        }
+        this.collection = coll;
+    }
+
+    /**
+     * Gets the collection being decorated.
+     * All access to the decorated collection goes via this method.
+     *
+     * @return the decorated collection
+     */
+    protected Collection<E> decorated() {
+        return collection;
+    }
+
+    /**
+     * Sets the collection being decorated.
+     * <p>
+     * <b>NOTE:</b> this method should only be used during deserialization
+     *
+     * @param coll  the decorated collection
+     */
+    protected void setCollection(final Collection<E> coll) {
+        this.collection = coll;
+    }
+
+    //-----------------------------------------------------------------------
+
+    @Override
+    public boolean add(final E object) {
+        return decorated().add(object);
+    }
+
+    @Override
+    public boolean addAll(final Collection<? extends E> coll) {
+        return decorated().addAll(coll);
+    }
+
+    @Override
+    public void clear() {
+        decorated().clear();
+    }
+
+    @Override
+    public boolean contains(final Object object) {
+        return decorated().contains(object);
+    }
+
+    @Override
+    public boolean isEmpty() {
+        return decorated().isEmpty();
+    }
+
+    @Override
+    public Iterator<E> iterator() {
+        return decorated().iterator();
+    }
+
+    @Override
+    public boolean remove(final Object object) {
+        return decorated().remove(object);
+    }
+
+    @Override
+    public int size() {
+        return decorated().size();
+    }
+
+    @Override
+    public Object[] toArray() {
+        return decorated().toArray();
+    }
+
+    @Override
+    public <T> T[] toArray(final T[] object) {
+        return decorated().toArray(object);
+    }
+
+    @Override
+    public boolean containsAll(final Collection<?> coll) {
+        return decorated().containsAll(coll);
+    }
+
+    @Override
+    public boolean removeAll(final Collection<?> coll) {
+        return decorated().removeAll(coll);
+    }
+
+    @Override
+    public boolean retainAll(final Collection<?> coll) {
+        return decorated().retainAll(coll);
+    }
+
+    @Override
+    public String toString() {
+        return decorated().toString();
+    }
+
+}

fine-commons-collections4/src/com/fr/third/org/apache/commons/collections4/collection/CompositeCollection.java

@@ -0,0 +1,483 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.fr.third.org.apache.commons.collections4.collection;
+
+import java.io.Serializable;
+import java.lang.reflect.Array;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collection;
+import java.util.Iterator;
+import java.util.List;
+
+import com.fr.third.org.apache.commons.collections4.iterators.EmptyIterator;
+import com.fr.third.org.apache.commons.collections4.list.UnmodifiableList;
+import com.fr.third.org.apache.commons.collections4.iterators.EmptyIterator;
+import com.fr.third.org.apache.commons.collections4.iterators.IteratorChain;
+import com.fr.third.org.apache.commons.collections4.list.UnmodifiableList;
+
+/**
+ * Decorates a collection of other collections to provide a single unified view.
+ * <p>
+ * Changes made to this collection will actually be made on the decorated collection.
+ * Add and remove operations require the use of a pluggable strategy. If no
+ * strategy is provided then add and remove are unsupported.
+ *
+ * @param <E> the type of the elements in the collection
+ * @since 3.0
+ * @version $Id: CompositeCollection.java 1683951 2015-06-06 20:19:03Z tn $
+ */
+public class CompositeCollection<E> implements Collection<E>, Serializable {
+
+    /** Serialization version */
+    private static final long serialVersionUID = 8417515734108306801L;
+
+    /** CollectionMutator to handle changes to the collection */
+    private CollectionMutator<E> mutator;
+
+    /** Collections in the composite */
+    private final List<Collection<E>> all = new ArrayList<Collection<E>>();
+
+    /**
+     * Create an empty CompositeCollection.
+     */
+    public CompositeCollection() {
+        super();
+    }
+
+    /**
+     * Create a Composite Collection with one collection.
+     *
+     * @param compositeCollection  the Collection to be appended to the composite
+     */
+    public CompositeCollection(final Collection<E> compositeCollection) {
+        super();
+        addComposited(compositeCollection);
+    }
+
+    /**
+     * Create a Composite Collection with two collections.
+     *
+     * @param compositeCollection1  the Collection to be appended to the composite
+     * @param compositeCollection2  the Collection to be appended to the composite
+     */
+    public CompositeCollection(final Collection<E> compositeCollection1,
+                               final Collection<E> compositeCollection2) {
+        super();
+        addComposited(compositeCollection1, compositeCollection2);
+    }
+
+    /**
+     * Create a Composite Collection with an array of collections.
+     *
+     * @param compositeCollections  the collections to composite
+     */
+    public CompositeCollection(final Collection<E>... compositeCollections) {
+        super();
+        addComposited(compositeCollections);
+    }
+
+    //-----------------------------------------------------------------------
+    /**
+     * Gets the size of this composite collection.
+     * <p>
+     * This implementation calls <code>size()</code> on each collection.
+     *
+     * @return total number of elements in all contained containers
+     */
+    @Override
+    public int size() {
+        int size = 0;
+        for (final Collection<E> item : all) {
+            size += item.size();
+        }
+        return size;
+    }
+
+    /**
+     * Checks whether this composite collection is empty.
+     * <p>
+     * This implementation calls <code>isEmpty()</code> on each collection.
+     *
+     * @return true if all of the contained collections are empty
+     */
+    @Override
+    public boolean isEmpty() {
+        for (final Collection<E> item : all) {
+            if (item.isEmpty() == false) {
+                return false;
+            }
+        }
+        return true;
+    }
+
+    /**
+     * Checks whether this composite collection contains the object.
+     * <p>
+     * This implementation calls <code>contains()</code> on each collection.
+     *
+     * @param obj  the object to search for
+     * @return true if obj is contained in any of the contained collections
+     */
+    @Override
+    public boolean contains(final Object obj) {
+        for (final Collection<E> item : all) {
+            if (item.contains(obj)) {
+                return true;
+            }
+        }
+        return false;
+    }
+
+    /**
+     * Gets an iterator over all the collections in this composite.
+     * <p>
+     * This implementation uses an <code>IteratorChain</code>.
+     *
+     * @return an <code>IteratorChain</code> instance which supports
+     *  <code>remove()</code>. Iteration occurs over contained collections in
+     *  the order they were added, but this behavior should not be relied upon.
+     * @see IteratorChain
+     */
+    @Override
+    public Iterator<E> iterator() {
+        if (all.isEmpty()) {
+            return EmptyIterator.<E>emptyIterator();
+        }
+        final IteratorChain<E> chain = new IteratorChain<E>();
+        for (final Collection<E> item : all) {
+            chain.addIterator(item.iterator());
+        }
+        return chain;
+    }
+
+    /**
+     * Returns an array containing all of the elements in this composite.
+     *
+     * @return an object array of all the elements in the collection
+     */
+    @Override
+    public Object[] toArray() {
+        final Object[] result = new Object[size()];
+        int i = 0;
+        for (final Iterator<E> it = iterator(); it.hasNext(); i++) {
+            result[i] = it.next();
+        }
+        return result;
+    }
+
+    /**
+     * Returns an object array, populating the supplied array if possible.
+     * See <code>Collection</code> interface for full details.
+     *
+     * @param <T>  the type of the elements in the collection
+     * @param array  the array to use, populating if possible
+     * @return an array of all the elements in the collection
+     */
+    @Override
+    @SuppressWarnings("unchecked")
+    public <T> T[] toArray(final T[] array) {
+        final int size = size();
+        Object[] result = null;
+        if (array.length >= size) {
+            result = array;
+        } else {
+            result = (Object[]) Array.newInstance(array.getClass().getComponentType(), size);
+        }
+
+        int offset = 0;
+        for (final Collection<E> item : all) {
+            for (final E e : item) {
+                result[offset++] = e;
+            }
+        }
+        if (result.length > size) {
+            result[size] = null;
+        }
+        return (T[]) result;
+    }
+
+    /**
+     * Adds an object to the collection, throwing UnsupportedOperationException
+     * unless a CollectionMutator strategy is specified.
+     *
+     * @param obj  the object to add
+     * @return {@code true} if the collection was modified
+     * @throws UnsupportedOperationException if CollectionMutator hasn't been set
+     * @throws UnsupportedOperationException if add is unsupported
+     * @throws ClassCastException if the object cannot be added due to its type
+     * @throws NullPointerException if the object cannot be added because its null
+     * @throws IllegalArgumentException if the object cannot be added
+     */
+    @Override
+    public boolean add(final E obj) {
+        if (mutator == null) {
+           throw new UnsupportedOperationException(
+               "add() is not supported on CompositeCollection without a CollectionMutator strategy");
+        }
+        return mutator.add(this, all, obj);
+    }
+
+    /**
+     * Removes an object from the collection, throwing UnsupportedOperationException
+     * unless a CollectionMutator strategy is specified.
+     *
+     * @param obj  the object being removed
+     * @return true if the collection is changed
+     * @throws UnsupportedOperationException if removed is unsupported
+     * @throws ClassCastException if the object cannot be removed due to its type
+     * @throws NullPointerException if the object cannot be removed because its null
+     * @throws IllegalArgumentException if the object cannot be removed
+     */
+    @Override
+    public boolean remove(final Object obj) {
+        if (mutator == null) {
+            throw new UnsupportedOperationException(
+                "remove() is not supported on CompositeCollection without a CollectionMutator strategy");
+        }
+        return mutator.remove(this, all, obj);
+    }
+
+    /**
+     * Checks whether this composite contains all the elements in the specified collection.
+     * <p>
+     * This implementation calls <code>contains()</code> for each element in the
+     * specified collection.
+     *
+     * @param coll  the collection to check for
+     * @return true if all elements contained
+     */
+    @Override
+    public boolean containsAll(final Collection<?> coll) {
+        for (final Object item : coll) {
+            if (contains(item) == false) {
+                return false;
+            }
+        }
+        return true;
+    }
+
+    /**
+     * Adds a collection of elements to this collection, throwing
+     * UnsupportedOperationException unless a CollectionMutator strategy is specified.
+     *
+     * @param coll  the collection to add
+     * @return true if the collection was modified
+     * @throws UnsupportedOperationException if CollectionMutator hasn't been set
+     * @throws UnsupportedOperationException if add is unsupported
+     * @throws ClassCastException if the object cannot be added due to its type
+     * @throws NullPointerException if the object cannot be added because its null
+     * @throws IllegalArgumentException if the object cannot be added
+     */
+    @Override
+    public boolean addAll(final Collection<? extends E> coll) {
+        if (mutator == null) {
+            throw new UnsupportedOperationException(
+                "addAll() is not supported on CompositeCollection without a CollectionMutator strategy");
+        }
+        return mutator.addAll(this, all, coll);
+    }
+
+    /**
+     * Removes the elements in the specified collection from this composite collection.
+     * <p>
+     * This implementation calls <code>removeAll</code> on each collection.
+     *
+     * @param coll  the collection to remove
+     * @return true if the collection was modified
+     * @throws UnsupportedOperationException if removeAll is unsupported
+     */
+    @Override
+    public boolean removeAll(final Collection<?> coll) {
+        if (coll.size() == 0) {
+            return false;
+        }
+        boolean changed = false;
+        for (final Collection<E> item : all) {
+            changed |= item.removeAll(coll);
+        }
+        return changed;
+    }
+
+    /**
+     * Retains all the elements in the specified collection in this composite collection,
+     * removing all others.
+     * <p>
+     * This implementation calls <code>retainAll()</code> on each collection.
+     *
+     * @param coll  the collection to remove
+     * @return true if the collection was modified
+     * @throws UnsupportedOperationException if retainAll is unsupported
+     */
+    @Override
+    public boolean retainAll(final Collection<?> coll) {
+        boolean changed = false;
+        for (final Collection<E> item : all) {
+            changed |= item.retainAll(coll);
+        }
+        return changed;
+    }
+
+    /**
+     * Removes all of the elements from this collection .
+     * <p>
+     * This implementation calls <code>clear()</code> on each collection.
+     *
+     * @throws UnsupportedOperationException if clear is unsupported
+     */
+    @Override
+    public void clear() {
+        for (final Collection<E> coll : all) {
+            coll.clear();
+        }
+    }
+
+    //-----------------------------------------------------------------------
+    /**
+     * Specify a CollectionMutator strategy instance to handle changes.
+     *
+     * @param mutator  the mutator to use
+     */
+    public void setMutator(final CollectionMutator<E> mutator) {
+        this.mutator = mutator;
+    }
+
+    /**
+     * Add these Collections to the list of collections in this composite
+     *
+     * @param compositeCollection  the Collection to be appended to the composite
+     */
+    public void addComposited(final Collection<E> compositeCollection) {
+        all.add(compositeCollection);
+    }
+
+    /**
+     * Add these Collections to the list of collections in this composite
+     *
+     * @param compositeCollection1  the Collection to be appended to the composite
+     * @param compositeCollection2  the Collection to be appended to the composite
+     */
+    public void addComposited(final Collection<E> compositeCollection1,
+                              final Collection<E> compositeCollection2) {
+        all.add(compositeCollection1);
+        all.add(compositeCollection2);
+    }
+
+    /**
+     * Add these Collections to the list of collections in this composite
+     *
+     * @param compositeCollections  the Collections to be appended to the composite
+     */
+    public void addComposited(final Collection<E>... compositeCollections) {
+        all.addAll(Arrays.asList(compositeCollections));
+    }
+
+    /**
+     * Removes a collection from the those being decorated in this composite.
+     *
+     * @param coll  collection to be removed
+     */
+    public void removeComposited(final Collection<E> coll) {
+        all.remove(coll);
+    }
+
+    //-----------------------------------------------------------------------
+    /**
+     * Returns a new collection containing all of the elements
+     *
+     * @return A new ArrayList containing all of the elements in this composite.
+     *         The new collection is <i>not</i> backed by this composite.
+     */
+    public Collection<E> toCollection() {
+        return new ArrayList<E>(this);
+    }
+
+    /**
+     * Gets the collections being decorated.
+     *
+     * @return Unmodifiable list of all collections in this composite.
+     */
+    public List<Collection<E>> getCollections() {
+        return UnmodifiableList.unmodifiableList(all);
+    }
+
+    /**
+     * Get the collection mutator to be used for this CompositeCollection.
+     * @return CollectionMutator<E>
+     */
+    protected CollectionMutator<E> getMutator() {
+        return mutator;
+    }
+
+    //-----------------------------------------------------------------------
+    /**
+     * Pluggable strategy to handle changes to the composite.
+     *
+     * @param <E> the element being held in the collection
+     */
+    public interface CollectionMutator<E> extends Serializable {
+
+        /**
+         * Called when an object is to be added to the composite.
+         *
+         * @param composite  the CompositeCollection being changed
+         * @param collections  all of the Collection instances in this CompositeCollection
+         * @param obj  the object being added
+         * @return true if the collection is changed
+         * @throws UnsupportedOperationException if add is unsupported
+         * @throws ClassCastException if the object cannot be added due to its type
+         * @throws NullPointerException if the object cannot be added because its null
+         * @throws IllegalArgumentException if the object cannot be added
+         */
+        boolean add(CompositeCollection<E> composite, List<Collection<E>> collections, E obj);
+
+        /**
+         * Called when a collection is to be added to the composite.
+         *
+         * @param composite  the CompositeCollection being changed
+         * @param collections  all of the Collection instances in this CompositeCollection
+         * @param coll  the collection being added
+         * @return true if the collection is changed
+         * @throws UnsupportedOperationException if add is unsupported
+         * @throws ClassCastException if the object cannot be added due to its type
+         * @throws NullPointerException if the object cannot be added because its null
+         * @throws IllegalArgumentException if the object cannot be added
+         */
+        boolean addAll(CompositeCollection<E> composite,
+                              List<Collection<E>> collections,
+                              Collection<? extends E> coll);
+
+        /**
+         * Called when an object is to be removed to the composite.
+         *
+         * @param composite  the CompositeCollection being changed
+         * @param collections  all of the Collection instances in this CompositeCollection
+         * @param obj  the object being removed
+         * @return true if the collection is changed
+         * @throws UnsupportedOperationException if removed is unsupported
+         * @throws ClassCastException if the object cannot be removed due to its type
+         * @throws NullPointerException if the object cannot be removed because its null
+         * @throws IllegalArgumentException if the object cannot be removed
+         */
+        boolean remove(CompositeCollection<E> composite,
+                              List<Collection<E>> collections,
+                              Object obj);
+
+    }
+
+}
+

fine-commons-collections4/src/com/fr/third/org/apache/commons/collections4/collection/IndexedCollection.java

@@ -0,0 +1,263 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.fr.third.org.apache.commons.collections4.collection;
+
+import java.util.Collection;
+import java.util.HashMap;
+
+import com.fr.third.org.apache.commons.collections4.MultiMap;
+import com.fr.third.org.apache.commons.collections4.Transformer;
+import com.fr.third.org.apache.commons.collections4.map.MultiValueMap;
+import com.fr.third.org.apache.commons.collections4.MultiMap;
+import com.fr.third.org.apache.commons.collections4.Transformer;
+import com.fr.third.org.apache.commons.collections4.map.MultiValueMap;
+
+/**
+ * An IndexedCollection is a Map-like view onto a Collection. It accepts a
+ * keyTransformer to define how the keys are converted from the values.
+ * <p>
+ * Modifications made to this decorator modify the index as well as the
+ * decorated {@link Collection}. However, modifications to the underlying
+ * {@link Collection} will not update the index and it will get out of sync.
+ * <p>
+ * If modification of the decorated {@link Collection} is unavoidable, then a
+ * call to {@link #reindex()} will update the index to the current contents of
+ * the {@link Collection}.
+ *
+ * @param <K> the type of object in the index.
+ * @param <C> the type of object in the collection.
+ *
+ * @since 4.0
+ * @version $Id: IndexedCollection.java 1683018 2015-06-01 22:41:31Z tn $
+ */
+public class IndexedCollection<K, C> extends AbstractCollectionDecorator<C> {
+
+    // TODO: replace with MultiValuedMap
+
+    /** Serialization version */
+    private static final long serialVersionUID = -5512610452568370038L;
+
+    /** The {@link Transformer} for generating index keys. */
+    private final Transformer<C, K> keyTransformer;
+
+    /** The map of indexes to collected objects. */
+    private final MultiMap<K, C> index;
+
+    /** The uniqueness constraint for the index. */
+    private final boolean uniqueIndex;
+
+    /**
+     * Create an {@link IndexedCollection} for a unique index.
+     * <p>
+     * If an element is added, which maps to an existing key, an {@link IllegalArgumentException}
+     * will be thrown.
+     *
+     * @param <K> the index object type.
+     * @param <C> the collection type.
+     * @param coll the decorated {@link Collection}.
+     * @param keyTransformer the {@link Transformer} for generating index keys.
+     * @return the created {@link IndexedCollection}.
+     */
+    public static <K, C> IndexedCollection<K, C> uniqueIndexedCollection(final Collection<C> coll,
+                                                                         final Transformer<C, K> keyTransformer) {
+        return new IndexedCollection<K, C>(coll, keyTransformer,
+                                           MultiValueMap.<K, C>multiValueMap(new HashMap<K, Collection<C>>()),
+                                           true);
+    }
+
+    /**
+     * Create an {@link IndexedCollection} for a non-unique index.
+     *
+     * @param <K> the index object type.
+     * @param <C> the collection type.
+     * @param coll the decorated {@link Collection}.
+     * @param keyTransformer the {@link Transformer} for generating index keys.
+     * @return the created {@link IndexedCollection}.
+     */
+    public static <K, C> IndexedCollection<K, C> nonUniqueIndexedCollection(final Collection<C> coll,
+                                                                            final Transformer<C, K> keyTransformer) {
+        return new IndexedCollection<K, C>(coll, keyTransformer,
+                                           MultiValueMap.<K, C>multiValueMap(new HashMap<K, Collection<C>>()),
+                                           false);
+    }
+
+    /**
+     * Create a {@link IndexedCollection}.
+     *
+     * @param coll  decorated {@link Collection}
+     * @param keyTransformer  {@link Transformer} for generating index keys
+     * @param map  map to use as index
+     * @param uniqueIndex  if the index shall enforce uniqueness of index keys
+     */
+    public IndexedCollection(final Collection<C> coll, final Transformer<C, K> keyTransformer,
+                             final MultiMap<K, C> map, final boolean uniqueIndex) {
+        super(coll);
+        this.keyTransformer = keyTransformer;
+        this.index = map;
+        this.uniqueIndex = uniqueIndex;
+        reindex();
+    }
+
+    /**
+     * {@inheritDoc}
+     *
+     * @throws IllegalArgumentException if the object maps to an existing key and the index
+     *   enforces a uniqueness constraint
+     */
+    @Override
+    public boolean add(final C object) {
+        final boolean added = super.add(object);
+        if (added) {
+            addToIndex(object);
+        }
+        return added;
+    }
+
+    @Override
+    public boolean addAll(final Collection<? extends C> coll) {
+        boolean changed = false;
+        for (final C c: coll) {
+            changed |= add(c);
+        }
+        return changed;
+    }
+
+    @Override
+    public void clear() {
+        super.clear();
+        index.clear();
+    }
+
+    /**
+     * {@inheritDoc}
+     * <p>
+     * Note: uses the index for fast lookup
+     */
+    @SuppressWarnings("unchecked")
+    @Override
+    public boolean contains(final Object object) {
+        return index.containsKey(keyTransformer.transform((C) object));
+    }
+
+    /**
+     * {@inheritDoc}
+     * <p>
+     * Note: uses the index for fast lookup
+     */
+    @Override
+    public boolean containsAll(final Collection<?> coll) {
+        for (final Object o : coll) {
+            if (!contains(o)) {
+                return false;
+            }
+        }
+        return true;
+    }
+
+    /**
+     * Get the element associated with the given key.
+     * <p>
+     * In case of a non-unique index, this method will return the first
+     * value associated with the given key. To retrieve all elements associated
+     * with a key, use {@link #values(Object)}.
+     *
+     * @param key  key to look up
+     * @return element found
+     * @see #values(Object)
+     */
+    public C get(final K key) {
+        @SuppressWarnings("unchecked") // index is a MultiMap which returns a Collection
+        final Collection<C> coll = (Collection<C>) index.get(key);
+        return coll == null ? null : coll.iterator().next();
+    }
+
+    /**
+     * Get all elements associated with the given key.
+     *
+     * @param key  key to look up
+     * @return a collection of elements found, or null if {@code contains(key) == false}
+     */
+    @SuppressWarnings("unchecked") // index is a MultiMap which returns a Collection
+    public Collection<C> values(final K key) {
+        return (Collection<C>) index.get(key);
+    }
+
+    /**
+     * Clears the index and re-indexes the entire decorated {@link Collection}.
+     */
+    public void reindex() {
+        index.clear();
+        for (final C c : decorated()) {
+            addToIndex(c);
+        }
+    }
+
+    @SuppressWarnings("unchecked")
+    @Override
+    public boolean remove(final Object object) {
+        final boolean removed = super.remove(object);
+        if (removed) {
+            removeFromIndex((C) object);
+        }
+        return removed;
+    }
+
+    @Override
+    public boolean removeAll(final Collection<?> coll) {
+        boolean changed = false;
+        for (final Object o : coll) {
+            changed |= remove(o);
+        }
+        return changed;
+    }
+
+    @Override
+    public boolean retainAll(final Collection<?> coll) {
+        final boolean changed = super.retainAll(coll);
+        if (changed) {
+            reindex();
+        }
+        return changed;
+    }
+
+    //-----------------------------------------------------------------------
+
+    /**
+     * Provides checking for adding the index.
+     *
+     * @param object the object to index
+     * @throws IllegalArgumentException if the object maps to an existing key and the index
+     *   enforces a uniqueness constraint
+     */
+    private void addToIndex(final C object) {
+        final K key = keyTransformer.transform(object);
+        if (uniqueIndex && index.containsKey(key)) {
+            throw new IllegalArgumentException("Duplicate key in uniquely indexed collection.");
+        }
+        index.put(key, object);
+    }
+
+    /**
+     * Removes an object from the index.
+     *
+     * @param object the object to remove
+     */
+    private void removeFromIndex(final C object) {
+        index.remove(keyTransformer.transform(object));
+    }
+
+}

fine-commons-collections4/src/com/fr/third/org/apache/commons/collections4/collection/PredicatedCollection.java

@@ -0,0 +1,455 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.fr.third.org.apache.commons.collections4.collection;
+
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.HashSet;
+import java.util.LinkedList;
+import java.util.List;
+import java.util.Queue;
+import java.util.Set;
+
+import com.fr.third.org.apache.commons.collections4.Bag;
+import com.fr.third.org.apache.commons.collections4.MultiSet;
+import com.fr.third.org.apache.commons.collections4.Predicate;
+import com.fr.third.org.apache.commons.collections4.bag.HashBag;
+import com.fr.third.org.apache.commons.collections4.bag.PredicatedBag;
+import com.fr.third.org.apache.commons.collections4.functors.NotNullPredicate;
+import com.fr.third.org.apache.commons.collections4.list.PredicatedList;
+import com.fr.third.org.apache.commons.collections4.multiset.HashMultiSet;
+import com.fr.third.org.apache.commons.collections4.multiset.PredicatedMultiSet;
+import com.fr.third.org.apache.commons.collections4.queue.PredicatedQueue;
+import com.fr.third.org.apache.commons.collections4.set.PredicatedSet;
+import com.fr.third.org.apache.commons.collections4.Bag;
+import com.fr.third.org.apache.commons.collections4.MultiSet;
+import com.fr.third.org.apache.commons.collections4.Predicate;
+import com.fr.third.org.apache.commons.collections4.bag.HashBag;
+import com.fr.third.org.apache.commons.collections4.bag.PredicatedBag;
+import com.fr.third.org.apache.commons.collections4.functors.NotNullPredicate;
+import com.fr.third.org.apache.commons.collections4.list.PredicatedList;
+import com.fr.third.org.apache.commons.collections4.multiset.HashMultiSet;
+import com.fr.third.org.apache.commons.collections4.multiset.PredicatedMultiSet;
+import com.fr.third.org.apache.commons.collections4.queue.PredicatedQueue;
+import com.fr.third.org.apache.commons.collections4.set.PredicatedSet;
+
+/**
+ * Decorates another {@link Collection} to validate that additions
+ * match a specified predicate.
+ * <p>
+ * This collection exists to provide validation for the decorated collection.
+ * It is normally created to decorate an empty collection.
+ * If an object cannot be added to the collection, an IllegalArgumentException is thrown.
+ * <p>
+ * One usage would be to ensure that no null entries are added to the collection:
+ * <pre>
+ * Collection coll = PredicatedCollection.predicatedCollection(new ArrayList(), NotNullPredicate.INSTANCE);
+ * </pre>
+ * <p>
+ * This class is Serializable from Commons Collections 3.1.
+ *
+ * @param <E> the type of the elements in the collection
+ * @since 3.0
+ * @version $Id: PredicatedCollection.java 1714484 2015-11-15 18:20:41Z tn $
+ */
+public class PredicatedCollection<E> extends AbstractCollectionDecorator<E> {
+
+    /** Serialization version */
+    private static final long serialVersionUID = -5259182142076705162L;
+
+    /** The predicate to use */
+    protected final Predicate<? super E> predicate;
+
+    /**
+     * Returns a Builder with the given predicate.
+     *
+     * @param <E>  the element type
+     * @param predicate  the predicate to use
+     * @return a new Builder for predicated collections
+     * @since 4.1
+     */
+    public static <E> Builder<E> builder(final Predicate<? super E> predicate) {
+        return new Builder<E>(predicate);
+    }
+
+    /**
+     * Returns a Builder with a NotNullPredicate.
+     *
+     * @param <E>  the element type
+     * @return a new Builder for predicated collections that ignores null values.
+     * @since 4.1
+     */
+    public static <E> Builder<E> notNullBuilder() {
+        return new Builder<E>(NotNullPredicate.<E>notNullPredicate());
+    }
+
+    /**
+     * Factory method to create a predicated (validating) collection.
+     * <p>
+     * If there are any elements already in the collection being decorated, they
+     * are validated.
+     *
+     * @param <T> the type of the elements in the collection
+     * @param coll  the collection to decorate, must not be null
+     * @param predicate  the predicate to use for validation, must not be null
+     * @return a new predicated collection
+     * @throws NullPointerException if collection or predicate is null
+     * @throws IllegalArgumentException if the collection contains invalid elements
+     * @since 4.0
+     */
+    public static <T> PredicatedCollection<T> predicatedCollection(final Collection<T> coll,
+                                                                   final Predicate<? super T> predicate) {
+        return new PredicatedCollection<T>(coll, predicate);
+    }
+
+    //-----------------------------------------------------------------------
+    /**
+     * Constructor that wraps (not copies).
+     * <p>
+     * If there are any elements already in the collection being decorated, they
+     * are validated.
+     *
+     * @param coll  the collection to decorate, must not be null
+     * @param predicate  the predicate to use for validation, must not be null
+     * @throws NullPointerException if collection or predicate is null
+     * @throws IllegalArgumentException if the collection contains invalid elements
+     */
+    protected PredicatedCollection(final Collection<E> coll, final Predicate<? super E> predicate) {
+        super(coll);
+        if (predicate == null) {
+            throw new NullPointerException("Predicate must not be null.");
+        }
+        this.predicate = predicate;
+        for (final E item : coll) {
+            validate(item);
+        }
+    }
+
+    /**
+     * Validates the object being added to ensure it matches the predicate.
+     * <p>
+     * The predicate itself should not throw an exception, but return false to
+     * indicate that the object cannot be added.
+     *
+     * @param object  the object being added
+     * @throws IllegalArgumentException if the add is invalid
+     */
+    protected void validate(final E object) {
+        if (predicate.evaluate(object) == false) {
+            throw new IllegalArgumentException("Cannot add Object '" + object + "' - Predicate '" +
+                                               predicate + "' rejected it");
+        }
+    }
+
+    //-----------------------------------------------------------------------
+    /**
+     * Override to validate the object being added to ensure it matches
+     * the predicate.
+     *
+     * @param object  the object being added
+     * @return the result of adding to the underlying collection
+     * @throws IllegalArgumentException if the add is invalid
+     */
+    @Override
+    public boolean add(final E object) {
+        validate(object);
+        return decorated().add(object);
+    }
+
+    /**
+     * Override to validate the objects being added to ensure they match
+     * the predicate. If any one fails, no update is made to the underlying
+     * collection.
+     *
+     * @param coll  the collection being added
+     * @return the result of adding to the underlying collection
+     * @throws IllegalArgumentException if the add is invalid
+     */
+    @Override
+    public boolean addAll(final Collection<? extends E> coll) {
+        for (final E item : coll) {
+            validate(item);
+        }
+        return decorated().addAll(coll);
+    }
+
+    /**
+     * Builder for creating predicated collections.
+     * <p>
+     * Create a Builder with a predicate to validate elements against, then add any elements
+     * to the builder. Elements that fail the predicate will be added to a rejected list.
+     * Finally create or decorate a collection using the createPredicated[List,Set,Bag,Queue] methods.
+     * <p>
+     * An example:
+     * <pre>
+     *   Predicate&lt;String&gt; predicate = NotNullPredicate.notNullPredicate();
+     *   PredicatedCollectionBuilder&lt;String&gt; builder = PredicatedCollection.builder(predicate);
+     *   builder.add("item1");
+     *   builder.add(null);
+     *   builder.add("item2");
+     *   List&lt;String&gt; predicatedList = builder.createPredicatedList();
+     * </pre>
+     * <p>
+     * At the end of the code fragment above predicatedList is protected by the predicate supplied
+     * to the builder and it contains item1 and item2.
+     * <p>
+     * More elements can be added to the builder once a predicated collection has been created,
+     * but these elements will not be reflected in already created collections.
+     *
+     * @param <E>  the element type
+     * @since 4.1
+     */
+    public static class Builder<E> {
+
+        /** The predicate to use. */
+        private final Predicate<? super E> predicate;
+
+        /** The buffer containing valid elements. */
+        private final List<E> accepted = new ArrayList<E>();
+
+        /** The buffer containing rejected elements. */
+        private final List<E> rejected = new ArrayList<E>();
+
+        // -----------------------------------------------------------------------
+        /**
+         * Constructs a PredicatedCollectionBuilder with the specified Predicate.
+         *
+         * @param predicate  the predicate to use
+         * @throws NullPointerException if predicate is null
+         */
+        public Builder(final Predicate<? super E> predicate) {
+            if (predicate == null) {
+                throw new NullPointerException("Predicate must not be null");
+            }
+            this.predicate = predicate;
+        }
+
+        /**
+         * Adds the item to the builder.
+         * <p>
+         * If the predicate is true, it is added to the list of accepted elements,
+         * otherwise it is added to the rejected list.
+         *
+         * @param item  the element to add
+         * @return the PredicatedCollectionBuilder.
+         */
+        public Builder<E> add(final E item) {
+            if (predicate.evaluate(item)) {
+                accepted.add(item);
+            } else {
+                rejected.add(item);
+            }
+            return this;
+        }
+
+        /**
+         * Adds all elements from the given collection to the builder.
+         * <p>
+         * All elements for which the predicate evaluates to true will be added to the
+         * list of accepted elements, otherwise they are added to the rejected list.
+         *
+         * @param items  the elements to add to the builder
+         * @return the PredicatedCollectionBuilder.
+         */
+        public Builder<E> addAll(final Collection<? extends E> items) {
+            if (items != null) {
+                for (E item : items) {
+                    add(item);
+                }
+            }
+            return this;
+        }
+
+        /**
+         * Create a new predicated list filled with the accepted elements.
+         * <p>
+         * The builder is not modified by this method, so it is possible to create more collections
+         * or add more elements afterwards. Further changes will not propagate to the returned list.
+         *
+         * @return a new predicated list.
+         */
+        public List<E> createPredicatedList() {
+            return createPredicatedList(new ArrayList<E>());
+        }
+
+        /**
+         * Decorates the given list with validating behavior using the predicate. All accepted elements
+         * are appended to the list. If the list already contains elements, they are validated.
+         * <p>
+         * The builder is not modified by this method, so it is possible to create more collections
+         * or add more elements afterwards. Further changes will not propagate to the returned list.
+         *
+         * @param list  the List to decorate, must not be null
+         * @return the decorated list.
+         * @throws NullPointerException if list is null
+         * @throws IllegalArgumentException if list contains invalid elements
+         */
+        public List<E> createPredicatedList(final List<E> list) {
+            if (list == null) {
+                throw new NullPointerException("List must not be null.");
+            }
+            final List<E> predicatedList = PredicatedList.predicatedList(list, predicate);
+            predicatedList.addAll(accepted);
+            return predicatedList;
+        }
+
+        /**
+         * Create a new predicated set filled with the accepted elements.
+         * <p>
+         * The builder is not modified by this method, so it is possible to create more collections
+         * or add more elements afterwards. Further changes will not propagate to the returned set.
+         *
+         * @return a new predicated set.
+         */
+        public Set<E> createPredicatedSet() {
+            return createPredicatedSet(new HashSet<E>());
+        }
+
+        /**
+         * Decorates the given list with validating behavior using the predicate. All accepted elements
+         * are appended to the set. If the set already contains elements, they are validated.
+         * <p>
+         * The builder is not modified by this method, so it is possible to create more collections
+         * or add more elements afterwards. Further changes will not propagate to the returned set.
+         *
+         * @param set  the set to decorate, must not be null
+         * @return the decorated set.
+         * @throws NullPointerException if set is null
+         * @throws IllegalArgumentException if set contains invalid elements
+         */
+        public Set<E> createPredicatedSet(final Set<E> set) {
+            if (set == null) {
+                throw new NullPointerException("Set must not be null.");
+            }
+            final PredicatedSet<E> predicatedSet = PredicatedSet.predicatedSet(set, predicate);
+            predicatedSet.addAll(accepted);
+            return predicatedSet;
+        }
+
+        /**
+         * Create a new predicated multiset filled with the accepted elements.
+         * <p>
+         * The builder is not modified by this method, so it is possible to create more collections
+         * or add more elements afterwards. Further changes will not propagate to the returned multiset.
+         *
+         * @return a new predicated multiset.
+         */
+        public MultiSet<E> createPredicatedMultiSet() {
+            return createPredicatedMultiSet(new HashMultiSet<E>());
+        }
+
+        /**
+         * Decorates the given multiset with validating behavior using the predicate. All accepted elements
+         * are appended to the multiset. If the multiset already contains elements, they are validated.
+         * <p>
+         * The builder is not modified by this method, so it is possible to create more collections
+         * or add more elements afterwards. Further changes will not propagate to the returned multiset.
+         *
+         * @param multiset  the multiset to decorate, must not be null
+         * @return the decorated multiset.
+         * @throws NullPointerException if multiset is null
+         * @throws IllegalArgumentException if multiset contains invalid elements
+         */
+        public MultiSet<E> createPredicatedMultiSet(final MultiSet<E> multiset) {
+            if (multiset == null) {
+                throw new NullPointerException("MultiSet must not be null.");
+            }
+            final PredicatedMultiSet<E> predicatedMultiSet =
+                    PredicatedMultiSet.predicatedMultiSet(multiset, predicate);
+            predicatedMultiSet.addAll(accepted);
+            return predicatedMultiSet;
+        }
+
+        /**
+         * Create a new predicated bag filled with the accepted elements.
+         * <p>
+         * The builder is not modified by this method, so it is possible to create more collections
+         * or add more elements afterwards. Further changes will not propagate to the returned bag.
+         *
+         * @return a new predicated bag.
+         */
+        public Bag<E> createPredicatedBag() {
+            return createPredicatedBag(new HashBag<E>());
+        }
+
+        /**
+         * Decorates the given bag with validating behavior using the predicate. All accepted elements
+         * are appended to the bag. If the bag already contains elements, they are validated.
+         * <p>
+         * The builder is not modified by this method, so it is possible to create more collections
+         * or add more elements afterwards. Further changes will not propagate to the returned bag.
+         *
+         * @param bag  the bag to decorate, must not be null
+         * @return the decorated bag.
+         * @throws NullPointerException if bag is null
+         * @throws IllegalArgumentException if bag contains invalid elements
+         */
+        public Bag<E> createPredicatedBag(final Bag<E> bag) {
+            if (bag == null) {
+                throw new NullPointerException("Bag must not be null.");
+            }
+            final PredicatedBag<E> predicatedBag = PredicatedBag.predicatedBag(bag, predicate);
+            predicatedBag.addAll(accepted);
+            return predicatedBag;
+        }
+
+        /**
+         * Create a new predicated queue filled with the accepted elements.
+         * <p>
+         * The builder is not modified by this method, so it is possible to create more collections
+         * or add more elements afterwards. Further changes will not propagate to the returned queue.
+         *
+         * @return a new predicated queue.
+         */
+        public Queue<E> createPredicatedQueue() {
+            return createPredicatedQueue(new LinkedList<E>());
+        }
+
+        /**
+         * Decorates the given queue with validating behavior using the predicate. All accepted elements
+         * are appended to the queue. If the queue already contains elements, they are validated.
+         * <p>
+         * The builder is not modified by this method, so it is possible to create more collections
+         * or add more elements afterwards. Further changes will not propagate to the returned queue.
+         *
+         * @param queue  the queue to decorate, must not be null
+         * @return the decorated queue.
+         * @throws NullPointerException if queue is null
+         * @throws IllegalArgumentException if queue contains invalid elements
+         */
+        public Queue<E> createPredicatedQueue(final Queue<E> queue) {
+            if (queue == null) {
+                throw new NullPointerException("queue must not be null");
+            }
+            final PredicatedQueue<E> predicatedQueue = PredicatedQueue.predicatedQueue(queue, predicate);
+            predicatedQueue.addAll(accepted);
+            return predicatedQueue;
+        }
+
+        /**
+         * Returns an unmodifiable collection containing all rejected elements.
+         *
+         * @return an unmodifiable collection
+         */
+        public Collection<E> rejectedElements() {
+            return Collections.unmodifiableCollection(rejected);
+        }
+
+    }
+
+}

fine-commons-collections4/src/com/fr/third/org/apache/commons/collections4/collection/SynchronizedCollection.java

@@ -0,0 +1,232 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.fr.third.org.apache.commons.collections4.collection;
+
+import java.io.Serializable;
+import java.util.Collection;
+import java.util.Iterator;
+
+/**
+ * Decorates another {@link Collection} to synchronize its behaviour
+ * for a multi-threaded environment.
+ * <p>
+ * Iterators must be manually synchronized:
+ * <pre>
+ * synchronized (coll) {
+ *   Iterator it = coll.iterator();
+ *   // do stuff with iterator
+ * }
+ * </pre>
+ * <p>
+ * This class is Serializable from Commons Collections 3.1.
+ *
+ * @param <E> the type of the elements in the collection
+ * @since 3.0
+ * @version $Id: SynchronizedCollection.java 1686855 2015-06-22 13:00:27Z tn $
+ */
+public class SynchronizedCollection<E> implements Collection<E>, Serializable {
+
+    /** Serialization version */
+    private static final long serialVersionUID = 2412805092710877986L;
+
+    /** The collection to decorate */
+    private final Collection<E> collection;
+    /** The object to lock on, needed for List/SortedSet views */
+    protected final Object lock;
+
+    /**
+     * Factory method to create a synchronized collection.
+     *
+     * @param <T> the type of the elements in the collection
+     * @param coll  the collection to decorate, must not be null
+     * @return a new synchronized collection
+     * @throws NullPointerException if collection is null
+     * @since 4.0
+     */
+    public static <T> SynchronizedCollection<T> synchronizedCollection(final Collection<T> coll) {
+        return new SynchronizedCollection<T>(coll);
+    }
+
+    //-----------------------------------------------------------------------
+    /**
+     * Constructor that wraps (not copies).
+     *
+     * @param collection  the collection to decorate, must not be null
+     * @throws NullPointerException if the collection is null
+     */
+    protected SynchronizedCollection(final Collection<E> collection) {
+        if (collection == null) {
+            throw new NullPointerException("Collection must not be null.");
+        }
+        this.collection = collection;
+        this.lock = this;
+    }
+
+    /**
+     * Constructor that wraps (not copies).
+     *
+     * @param collection  the collection to decorate, must not be null
+     * @param lock  the lock object to use, must not be null
+     * @throws NullPointerException if the collection or lock is null
+     */
+    protected SynchronizedCollection(final Collection<E> collection, final Object lock) {
+        if (collection == null) {
+            throw new NullPointerException("Collection must not be null.");
+        }
+        if (lock == null) {
+            throw new NullPointerException("Lock must not be null.");
+        }
+        this.collection = collection;
+        this.lock = lock;
+    }
+
+    /**
+     * Gets the collection being decorated.
+     *
+     * @return the decorated collection
+     */
+    protected Collection<E> decorated() {
+        return collection;
+    }
+
+    //-----------------------------------------------------------------------
+
+    @Override
+    public boolean add(final E object) {
+        synchronized (lock) {
+            return decorated().add(object);
+        }
+    }
+
+    @Override
+    public boolean addAll(final Collection<? extends E> coll) {
+        synchronized (lock) {
+            return decorated().addAll(coll);
+        }
+    }
+
+    @Override
+    public void clear() {
+        synchronized (lock) {
+            decorated().clear();
+        }
+    }
+
+    @Override
+    public boolean contains(final Object object) {
+        synchronized (lock) {
+            return decorated().contains(object);
+        }
+    }
+
+    @Override
+    public boolean containsAll(final Collection<?> coll) {
+        synchronized (lock) {
+            return decorated().containsAll(coll);
+        }
+    }
+
+    @Override
+    public boolean isEmpty() {
+        synchronized (lock) {
+            return decorated().isEmpty();
+        }
+    }
+
+    /**
+     * Iterators must be manually synchronized.
+     * <pre>
+     * synchronized (coll) {
+     *   Iterator it = coll.iterator();
+     *   // do stuff with iterator
+     * }
+     * </pre>
+     *
+     * @return an iterator that must be manually synchronized on the collection
+     */
+    @Override
+    public Iterator<E> iterator() {
+        return decorated().iterator();
+    }
+
+    @Override
+    public Object[] toArray() {
+        synchronized (lock) {
+            return decorated().toArray();
+        }
+    }
+
+    @Override
+    public <T> T[] toArray(final T[] object) {
+        synchronized (lock) {
+            return decorated().toArray(object);
+        }
+    }
+
+    @Override
+    public boolean remove(final Object object) {
+        synchronized (lock) {
+            return decorated().remove(object);
+        }
+    }
+
+    @Override
+    public boolean removeAll(final Collection<?> coll) {
+        synchronized (lock) {
+            return decorated().removeAll(coll);
+        }
+    }
+
+    @Override
+    public boolean retainAll(final Collection<?> coll) {
+        synchronized (lock) {
+            return decorated().retainAll(coll);
+        }
+    }
+
+    @Override
+    public int size() {
+        synchronized (lock) {
+            return decorated().size();
+        }
+    }
+
+    @Override
+    public boolean equals(final Object object) {
+        synchronized (lock) {
+            if (object == this) {
+                return true;
+            }
+            return object == this || decorated().equals(object);
+        }
+    }
+
+    @Override
+    public int hashCode() {
+        synchronized (lock) {
+            return decorated().hashCode();
+        }
+    }
+
+    @Override
+    public String toString() {
+        synchronized (lock) {
+            return decorated().toString();
+        }
+    }
+
+}

fine-commons-collections4/src/com/fr/third/org/apache/commons/collections4/collection/TransformedCollection.java

@@ -0,0 +1,156 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.fr.third.org.apache.commons.collections4.collection;
+
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.List;
+
+import com.fr.third.org.apache.commons.collections4.Transformer;
+import com.fr.third.org.apache.commons.collections4.Transformer;
+
+/**
+ * Decorates another {@link Collection} to transform objects that are added.
+ * <p>
+ * The add methods are affected by this class.
+ * Thus objects must be removed or searched for using their transformed form.
+ * For example, if the transformation converts Strings to Integers, you must
+ * use the Integer form to remove objects.
+ * <p>
+ * This class is Serializable from Commons Collections 3.1.
+ *
+ * @param <E> the type of the elements in the collection
+ * @since 3.0
+ * @version $Id: TransformedCollection.java 1686855 2015-06-22 13:00:27Z tn $
+ */
+public class TransformedCollection<E> extends AbstractCollectionDecorator<E> {
+
+    /** Serialization version */
+    private static final long serialVersionUID = 8692300188161871514L;
+
+    /** The transformer to use */
+    protected final Transformer<? super E, ? extends E> transformer;
+
+    /**
+     * Factory method to create a transforming collection.
+     * <p>
+     * If there are any elements already in the collection being decorated, they
+     * are NOT transformed.
+     * Contrast this with {@link #transformedCollection(Collection, Transformer)}.
+     *
+     * @param <E> the type of the elements in the collection
+     * @param coll  the collection to decorate, must not be null
+     * @param transformer  the transformer to use for conversion, must not be null
+     * @return a new transformed collection
+     * @throws NullPointerException if collection or transformer is null
+     * @since 4.0
+     */
+    public static <E> TransformedCollection<E> transformingCollection(final Collection<E> coll,
+            final Transformer<? super E, ? extends E> transformer) {
+        return new TransformedCollection<E>(coll, transformer);
+    }
+
+    /**
+     * Factory method to create a transforming collection that will transform
+     * existing contents of the specified collection.
+     * <p>
+     * If there are any elements already in the collection being decorated, they
+     * will be transformed by this method.
+     * Contrast this with {@link #transformingCollection(Collection, Transformer)}.
+     *
+     * @param <E> the type of the elements in the collection
+     * @param collection  the collection to decorate, must not be null
+     * @param transformer  the transformer to use for conversion, must not be null
+     * @return a new transformed Collection
+     * @throws NullPointerException if collection or transformer is null
+     * @since 4.0
+     */
+    public static <E> TransformedCollection<E> transformedCollection(final Collection<E> collection,
+            final Transformer<? super E, ? extends E> transformer) {
+
+        final TransformedCollection<E> decorated = new TransformedCollection<E>(collection, transformer);
+        // null collection & transformer are disallowed by the constructor call above
+        if (collection.size() > 0) {
+            @SuppressWarnings("unchecked") // collection is of type E
+            final E[] values = (E[]) collection.toArray(); // NOPMD - false positive for generics
+            collection.clear();
+            for (final E value : values) {
+                decorated.decorated().add(transformer.transform(value));
+            }
+        }
+        return decorated;
+    }
+
+    //-----------------------------------------------------------------------
+    /**
+     * Constructor that wraps (not copies).
+     * <p>
+     * If there are any elements already in the collection being decorated, they
+     * are NOT transformed.
+     *
+     * @param coll  the collection to decorate, must not be null
+     * @param transformer  the transformer to use for conversion, must not be null
+     * @throws NullPointerException if collection or transformer is null
+     */
+    protected TransformedCollection(final Collection<E> coll, final Transformer<? super E, ? extends E> transformer) {
+        super(coll);
+        if (transformer == null) {
+            throw new NullPointerException("Transformer must not be null");
+        }
+        this.transformer = transformer;
+    }
+
+    /**
+     * Transforms an object.
+     * <p>
+     * The transformer itself may throw an exception if necessary.
+     *
+     * @param object  the object to transform
+     * @return a transformed object
+     */
+    protected E transform(final E object) {
+        return transformer.transform(object);
+    }
+
+    /**
+     * Transforms a collection.
+     * <p>
+     * The transformer itself may throw an exception if necessary.
+     *
+     * @param coll  the collection to transform
+     * @return a transformed object
+     */
+    protected Collection<E> transform(final Collection<? extends E> coll) {
+        final List<E> list = new ArrayList<E>(coll.size());
+        for (final E item : coll) {
+            list.add(transform(item));
+        }
+        return list;
+    }
+
+    //-----------------------------------------------------------------------
+    @Override
+    public boolean add(final E object) {
+        return decorated().add(transform(object));
+    }
+
+    @Override
+    public boolean addAll(final Collection<? extends E> coll) {
+        return decorated().addAll(transform(coll));
+    }
+
+}

fine-commons-collections4/src/com/fr/third/org/apache/commons/collections4/collection/UnmodifiableBoundedCollection.java

@@ -0,0 +1,168 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.fr.third.org.apache.commons.collections4.collection;
+
+import java.util.Collection;
+import java.util.Iterator;
+
+import com.fr.third.org.apache.commons.collections4.BoundedCollection;
+import com.fr.third.org.apache.commons.collections4.Unmodifiable;
+import com.fr.third.org.apache.commons.collections4.BoundedCollection;
+import com.fr.third.org.apache.commons.collections4.Unmodifiable;
+import com.fr.third.org.apache.commons.collections4.iterators.UnmodifiableIterator;
+
+/**
+ * {@link UnmodifiableBoundedCollection} decorates another
+ * {@link BoundedCollection} to ensure it can't be altered.
+ * <p>
+ * If a BoundedCollection is first wrapped in some other collection decorator,
+ * such as synchronized or predicated, the BoundedCollection methods are no
+ * longer accessible.
+ * The factory on this class will attempt to retrieve the bounded nature by
+ * examining the package scope variables.
+ * <p>
+ * This class is Serializable from Commons Collections 3.1.
+ * <p>
+ * Attempts to modify it will result in an UnsupportedOperationException.
+ *
+ * @since 3.0
+ * @version $Id: UnmodifiableBoundedCollection.java 1686855 2015-06-22 13:00:27Z tn $
+ */
+public final class UnmodifiableBoundedCollection<E> extends AbstractCollectionDecorator<E>
+        implements BoundedCollection<E>, Unmodifiable {
+
+    /** Serialization version */
+    private static final long serialVersionUID = -7112672385450340330L;
+
+    /**
+     * Factory method to create an unmodifiable bounded collection.
+     *
+     * @param <E> the type of the elements in the collection
+     * @param coll  the <code>BoundedCollection</code> to decorate, must not be null
+     * @return a new unmodifiable bounded collection
+     * @throws NullPointerException if {@code coll} is {@code null}
+     * @since 4.0
+     */
+    public static <E> BoundedCollection<E> unmodifiableBoundedCollection(final BoundedCollection<? extends E> coll) {
+        if (coll instanceof Unmodifiable) {
+            @SuppressWarnings("unchecked") // safe to upcast
+            final BoundedCollection<E> tmpColl = (BoundedCollection<E>) coll;
+            return tmpColl;
+        }
+        return new UnmodifiableBoundedCollection<E>(coll);
+    }
+
+    /**
+     * Factory method to create an unmodifiable bounded collection.
+     * <p>
+     * This method is capable of drilling down through up to 1000 other decorators
+     * to find a suitable BoundedCollection.
+     *
+     * @param <E> the type of the elements in the collection
+     * @param coll  the <code>BoundedCollection</code> to decorate, must not be null
+     * @return a new unmodifiable bounded collection
+     * @throws NullPointerException if coll is null
+     * @throws IllegalArgumentException if coll is not a {@code BoundedCollection}
+     * @since 4.0
+     */
+    @SuppressWarnings("unchecked")
+    public static <E> BoundedCollection<E> unmodifiableBoundedCollection(Collection<? extends E> coll) {
+        if (coll == null) {
+            throw new NullPointerException("Collection must not be null.");
+        }
+
+        // handle decorators
+        for (int i = 0; i < 1000; i++) {  // counter to prevent infinite looping
+            if (coll instanceof BoundedCollection) {
+                break;  // normal loop exit
+            }
+            if (coll instanceof AbstractCollectionDecorator) {
+                coll = ((AbstractCollectionDecorator<E>) coll).decorated();
+            } else if (coll instanceof SynchronizedCollection) {
+                coll = ((SynchronizedCollection<E>) coll).decorated();
+            }
+        }
+
+        if (coll instanceof BoundedCollection == false) {
+            throw new IllegalArgumentException("Collection is not a bounded collection.");
+        }
+        return new UnmodifiableBoundedCollection<E>((BoundedCollection<E>) coll);
+    }
+
+    /**
+     * Constructor that wraps (not copies).
+     *
+     * @param coll  the collection to decorate, must not be null
+     * @throws NullPointerException if coll is null
+     */
+    @SuppressWarnings("unchecked") // safe to upcast
+    private UnmodifiableBoundedCollection(final BoundedCollection<? extends E> coll) {
+        super((BoundedCollection<E>) coll);
+    }
+
+    //-----------------------------------------------------------------------
+    @Override
+    public Iterator<E> iterator() {
+        return UnmodifiableIterator.unmodifiableIterator(decorated().iterator());
+    }
+
+    @Override
+    public boolean add(final E object) {
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public boolean addAll(final Collection<? extends E> coll) {
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public void clear() {
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public boolean remove(final Object object) {
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public boolean removeAll(final Collection<?> coll) {
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public boolean retainAll(final Collection<?> coll) {
+        throw new UnsupportedOperationException();
+    }
+
+    //-----------------------------------------------------------------------
+    @Override
+    public boolean isFull() {
+        return decorated().isFull();
+    }
+
+    @Override
+    public int maxSize() {
+        return decorated().maxSize();
+    }
+
+    @Override
+    protected BoundedCollection<E> decorated() {
+        return (BoundedCollection<E>) super.decorated();
+    }
+}

fine-commons-collections4/src/com/fr/third/org/apache/commons/collections4/collection/UnmodifiableCollection.java

@@ -0,0 +1,112 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.fr.third.org.apache.commons.collections4.collection;
+
+import java.util.Collection;
+import java.util.Iterator;
+
+import com.fr.third.org.apache.commons.collections4.Unmodifiable;
+import com.fr.third.org.apache.commons.collections4.Unmodifiable;
+import com.fr.third.org.apache.commons.collections4.iterators.UnmodifiableIterator;
+
+/**
+ * Decorates another {@link Collection} to ensure it can't be altered.
+ * <p>
+ * This class is Serializable from Commons Collections 3.1.
+ * <p>
+ * Attempts to modify it will result in an UnsupportedOperationException.
+ *
+ * @param <E> the type of the elements in the collection
+ * @since 3.0
+ * @version $Id: UnmodifiableCollection.java 1686855 2015-06-22 13:00:27Z tn $
+ */
+public final class UnmodifiableCollection<E>
+        extends AbstractCollectionDecorator<E>
+        implements Unmodifiable {
+
+    /** Serialization version */
+    private static final long serialVersionUID = -239892006883819945L;
+
+    /**
+     * Factory method to create an unmodifiable collection.
+     * <p>
+     * If the collection passed in is already unmodifiable, it is returned.
+     *
+     * @param <T> the type of the elements in the collection
+     * @param coll  the collection to decorate, must not be null
+     * @return an unmodifiable collection
+     * @throws NullPointerException if collection is null
+     * @since 4.0
+     */
+    public static <T> Collection<T> unmodifiableCollection(final Collection<? extends T> coll) {
+        if (coll instanceof Unmodifiable) {
+            @SuppressWarnings("unchecked") // safe to upcast
+            final Collection<T> tmpColl = (Collection<T>) coll;
+            return tmpColl;
+        }
+        return new UnmodifiableCollection<T>(coll);
+    }
+
+    //-----------------------------------------------------------------------
+    /**
+     * Constructor that wraps (not copies).
+     *
+     * @param coll  the collection to decorate, must not be null
+     * @throws NullPointerException if collection is null
+     */
+    @SuppressWarnings("unchecked") // safe to upcast
+    private UnmodifiableCollection(final Collection<? extends E> coll) {
+        super((Collection<E>) coll);
+    }
+
+    //-----------------------------------------------------------------------
+    @Override
+    public Iterator<E> iterator() {
+        return UnmodifiableIterator.unmodifiableIterator(decorated().iterator());
+    }
+
+    @Override
+    public boolean add(final E object) {
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public boolean addAll(final Collection<? extends E> coll) {
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public void clear() {
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public boolean remove(final Object object) {
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public boolean removeAll(final Collection<?> coll) {
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public boolean retainAll(final Collection<?> coll) {
+        throw new UnsupportedOperationException();
+    }
+
+}

fine-commons-collections4/src/com/fr/third/org/apache/commons/collections4/collection/package-info.java

@@ -0,0 +1,36 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+/**
+ * This package contains implementations of the
+ * {@link java.util.Collection Collection} interface.
+ * <p>
+ * The following implementations are provided in the package:
+ * <ul>
+ *   <li>CompositeCollection - a collection that combines multiple collections into one
+ * </ul>
+ * The following decorators are provided in the package:
+ * <ul>
+ *   <li>Synchronized - synchronizes method access for multi-threaded environments
+ *   <li>Unmodifiable - ensures the collection cannot be altered
+ *   <li>Predicated - ensures that only elements that are valid according to a predicate can be added
+ *   <li>Transformed - transforms elements as they are added
+ *   <li>Indexed - provides a map-like view onto another collection
+ * </ul>
+ *
+ * @version $Id: package-info.java 1477746 2013-04-30 18:11:20Z tn $
+ */
+package com.fr.third.org.apache.commons.collections4.collection;

fine-commons-collections4/src/com/fr/third/org/apache/commons/collections4/comparators/BooleanComparator.java

@@ -0,0 +1,192 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.fr.third.org.apache.commons.collections4.comparators;
+
+import java.io.Serializable;
+import java.util.Comparator;
+
+/**
+ * A {@link Comparator} for {@link Boolean} objects that can sort either
+ * true or false first.
+ * <p>
+ * @see #getTrueFirstComparator()
+ * @see #getFalseFirstComparator()
+ * @see #booleanComparator(boolean)
+ *
+ * @since 3.0
+ * @version $Id: BooleanComparator.java 1683951 2015-06-06 20:19:03Z tn $
+ */
+public final class BooleanComparator implements Comparator<Boolean>, Serializable {
+
+    /** Serialization version. */
+    private static final long serialVersionUID = 1830042991606340609L;
+
+    /** Constant "true first" reference. */
+    private static final BooleanComparator TRUE_FIRST = new BooleanComparator(true);
+
+    /** Constant "false first" reference. */
+    private static final BooleanComparator FALSE_FIRST = new BooleanComparator(false);
+
+    /** <code>true</code> iff <code>true</code> values sort before <code>false</code> values. */
+    private boolean trueFirst = false;
+
+    //-----------------------------------------------------------------------
+    /**
+     * Returns a BooleanComparator instance that sorts
+     * <code>true</code> values before <code>false</code> values.
+     * <p />
+     * Clients are encouraged to use the value returned from
+     * this method instead of constructing a new instance
+     * to reduce allocation and garbage collection overhead when
+     * multiple BooleanComparators may be used in the same
+     * virtual machine.
+     *
+     * @return the true first singleton BooleanComparator
+     */
+    public static BooleanComparator getTrueFirstComparator() {
+        return TRUE_FIRST;
+    }
+
+    /**
+     * Returns a BooleanComparator instance that sorts
+     * <code>false</code> values before <code>true</code> values.
+     * <p />
+     * Clients are encouraged to use the value returned from
+     * this method instead of constructing a new instance
+     * to reduce allocation and garbage collection overhead when
+     * multiple BooleanComparators may be used in the same
+     * virtual machine.
+     *
+     * @return the false first singleton BooleanComparator
+     */
+    public static BooleanComparator getFalseFirstComparator() {
+        return FALSE_FIRST;
+    }
+
+    /**
+     * Returns a BooleanComparator instance that sorts
+     * <code><i>trueFirst</i></code> values before
+     * <code>&#x21;<i>trueFirst</i></code> values.
+     * <p />
+     * Clients are encouraged to use the value returned from
+     * this method instead of constructing a new instance
+     * to reduce allocation and garbage collection overhead when
+     * multiple BooleanComparators may be used in the same
+     * virtual machine.
+     *
+     * @param trueFirst when <code>true</code>, sort
+     * <code>true</code> <code>Boolean</code>s before <code>false</code>
+     * @return a singleton BooleanComparator instance
+     * @since 4.0
+     */
+    public static BooleanComparator booleanComparator(final boolean trueFirst) {
+        return trueFirst ? TRUE_FIRST : FALSE_FIRST;
+    }
+
+    //-----------------------------------------------------------------------
+    /**
+     * Creates a <code>BooleanComparator</code> that sorts
+     * <code>false</code> values before <code>true</code> values.
+     * <p>
+     * Equivalent to {@link #BooleanComparator(boolean) BooleanComparator(false)}.
+     * <p>
+     * Please use the static factory instead whenever possible.
+     */
+    public BooleanComparator() {
+        this(false);
+    }
+
+    /**
+     * Creates a <code>BooleanComparator</code> that sorts
+     * <code><i>trueFirst</i></code> values before
+     * <code>&#x21;<i>trueFirst</i></code> values.
+     * <p>
+     * Please use the static factories instead whenever possible.
+     *
+     * @param trueFirst when <code>true</code>, sort
+     *  <code>true</code> boolean values before <code>false</code>
+     */
+    public BooleanComparator(final boolean trueFirst) {
+        this.trueFirst = trueFirst;
+    }
+
+    //-----------------------------------------------------------------------
+    /**
+     * Compares two non-<code>null</code> <code>Boolean</code> objects
+     * according to the value of {@link #sortsTrueFirst()}.
+     *
+     * @param b1  the first boolean to compare
+     * @param b2  the second boolean to compare
+     * @return negative if obj1 is less, positive if greater, zero if equal
+     * @throws NullPointerException when either argument <code>null</code>
+     */
+    @Override
+    public int compare(final Boolean b1, final Boolean b2) {
+        final boolean v1 = b1.booleanValue();
+        final boolean v2 = b2.booleanValue();
+
+        return (v1 ^ v2) ? ( (v1 ^ trueFirst) ? 1 : -1 ) : 0;
+    }
+
+    //-----------------------------------------------------------------------
+    /**
+     * Implement a hash code for this comparator that is consistent with
+     * {@link #equals(Object) equals}.
+     *
+     * @return a hash code for this comparator.
+     */
+    @Override
+    public int hashCode() {
+        final int hash = "BooleanComparator".hashCode();
+        return trueFirst ? -1 * hash : hash;
+    }
+
+    /**
+     * Returns <code>true</code> iff <i>that</i> Object is
+     * is a {@link Comparator} whose ordering is known to be
+     * equivalent to mine.
+     * <p>
+     * This implementation returns <code>true</code>
+     * iff <code><i>that</i></code> is a {@link BooleanComparator}
+     * whose value of {@link #sortsTrueFirst()} is equal to mine.
+     *
+     * @param object  the object to compare to
+     * @return true if equal
+     */
+    @Override
+    public boolean equals(final Object object) {
+        return (this == object) ||
+               ((object instanceof BooleanComparator) &&
+                (this.trueFirst == ((BooleanComparator)object).trueFirst));
+    }
+
+    //-----------------------------------------------------------------------
+    /**
+     * Returns <code>true</code> iff
+     * I sort <code>true</code> values before
+     * <code>false</code> values.  In other words,
+     * returns <code>true</code> iff
+     * {@link #compare(Boolean,Boolean) compare(Boolean.FALSE,Boolean.TRUE)}
+     * returns a positive value.
+     *
+     * @return the trueFirst flag
+     */
+    public boolean sortsTrueFirst() {
+        return trueFirst;
+    }
+
+}

fine-commons-collections4/src/com/fr/third/org/apache/commons/collections4/comparators/ComparableComparator.java

@@ -0,0 +1,130 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.fr.third.org.apache.commons.collections4.comparators;
+
+import java.io.Serializable;
+import java.util.Comparator;
+
+/**
+ * A {@link Comparator Comparator} that compares {@link Comparable Comparable}
+ * objects.
+ * <p>
+ * This Comparator is useful, for example, for enforcing the natural order in
+ * custom implementations of {@link java.util.SortedSet SortedSet} and
+ * {@link java.util.SortedMap SortedMap}.
+ * <p>
+ * Note: In the 2.0 and 2.1 releases of Commons Collections, this class would
+ * throw a {@link ClassCastException} if either of the arguments to
+ * {@link #compare(Object, Object) compare} were <code>null</code>, not
+ * {@link Comparable Comparable}, or for which
+ * {@link Comparable#compareTo(Object) compareTo} gave inconsistent results.
+ * This is no longer the case. See {@link #compare(Object, Object) compare} for
+ * details.
+ *
+ * @since 2.0
+ * @version $Id: ComparableComparator.java 1683951 2015-06-06 20:19:03Z tn $
+ *
+ * @see java.util.Collections#reverseOrder()
+ */
+public class ComparableComparator<E extends Comparable<? super E>> implements Comparator<E>, Serializable {
+
+    /** Serialization version. */
+    private static final long serialVersionUID=-291439688585137865L;
+
+    /** The singleton instance. */
+    @SuppressWarnings("rawtypes")
+    public static final ComparableComparator INSTANCE = new ComparableComparator();
+
+    //-----------------------------------------------------------------------
+    /**
+     * Gets the singleton instance of a ComparableComparator.
+     * <p>
+     * Developers are encouraged to use the comparator returned from this method
+     * instead of constructing a new instance to reduce allocation and GC overhead
+     * when multiple comparable comparators may be used in the same VM.
+     *
+     * @param <E>  the element type
+     * @return the singleton ComparableComparator
+     * @since 4.0
+     */
+    @SuppressWarnings("unchecked")
+    public static <E extends Comparable<? super E>> ComparableComparator<E> comparableComparator() {
+        return INSTANCE;
+    }
+
+    //-----------------------------------------------------------------------
+    /**
+     * Constructor whose use should be avoided.
+     * <p>
+     * Please use the {@link #comparableComparator()} method whenever possible.
+     */
+    public ComparableComparator() {
+        super();
+    }
+
+    //-----------------------------------------------------------------------
+    /**
+     * Compare the two {@link Comparable Comparable} arguments.
+     * This method is equivalent to:
+     * <pre>((Comparable)obj1).compareTo(obj2)</pre>
+     *
+     * @param obj1  the first object to compare
+     * @param obj2  the second object to compare
+     * @return negative if obj1 is less, positive if greater, zero if equal
+     * @throws NullPointerException if <i>obj1</i> is <code>null</code>,
+     *         or when <code>((Comparable)obj1).compareTo(obj2)</code> does
+     * @throws ClassCastException if <i>obj1</i> is not a <code>Comparable</code>,
+     *         or when <code>((Comparable)obj1).compareTo(obj2)</code> does
+     */
+    @Override
+    public int compare(final E obj1, final E obj2) {
+        return obj1.compareTo(obj2);
+    }
+
+    //-----------------------------------------------------------------------
+    /**
+     * Implement a hash code for this comparator that is consistent with
+     * {@link #equals(Object) equals}.
+     *
+     * @return a hash code for this comparator.
+     * @since 3.0
+     */
+    @Override
+    public int hashCode() {
+        return "ComparableComparator".hashCode();
+    }
+
+    /**
+     * Returns {@code true} iff <i>that</i> Object is is a {@link Comparator Comparator}
+     * whose ordering is known to be equivalent to mine.
+     * <p>
+     * This implementation returns {@code true} iff
+     * <code><i>object</i>.{@link Object#getClass() getClass()}</code> equals
+     * <code>this.getClass()</code>. Subclasses may want to override this behavior to remain
+     * consistent with the {@link Comparator#equals(Object)} contract.
+     *
+     * @param object  the object to compare with
+     * @return {@code true} if equal
+     * @since 3.0
+     */
+    @Override
+    public boolean equals(final Object object) {
+        return this == object ||
+               null != object && object.getClass().equals(this.getClass());
+    }
+
+}

fine-commons-collections4/src/com/fr/third/org/apache/commons/collections4/comparators/ComparatorChain.java

@@ -0,0 +1,349 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.fr.third.org.apache.commons.collections4.comparators;
+
+import java.io.Serializable;
+import java.util.ArrayList;
+import java.util.BitSet;
+import java.util.Comparator;
+import java.util.Iterator;
+import java.util.List;
+
+/**
+ * A ComparatorChain is a Comparator that wraps one or more Comparators in
+ * sequence. The ComparatorChain calls each Comparator in sequence until either
+ * 1) any single Comparator returns a non-zero result (and that result is then
+ * returned), or 2) the ComparatorChain is exhausted (and zero is returned).
+ * This type of sorting is very similar to multi-column sorting in SQL, and this
+ * class allows Java classes to emulate that kind of behaviour when sorting a
+ * List.
+ * <p>
+ * To further facilitate SQL-like sorting, the order of any single Comparator in
+ * the list can be reversed.
+ * <p>
+ * Calling a method that adds new Comparators or changes the ascend/descend sort
+ * <i>after compare(Object, Object) has been called</i> will result in an
+ * UnsupportedOperationException. However, <i>take care</i> to not alter the
+ * underlying List of Comparators or the BitSet that defines the sort order.
+ * <p>
+ * Instances of ComparatorChain are not synchronized. The class is not
+ * thread-safe at construction time, but it <i>is</i> thread-safe to perform
+ * multiple comparisons after all the setup operations are complete.
+ *
+ * @since 2.0
+ * @version $Id: ComparatorChain.java 1683951 2015-06-06 20:19:03Z tn $
+ */
+public class ComparatorChain<E> implements Comparator<E>, Serializable {
+
+    /** Serialization version from Collections 2.0. */
+    private static final long serialVersionUID = -721644942746081630L;
+
+    /** The list of comparators in the chain. */
+    private final List<Comparator<E>> comparatorChain;
+    /** Order - false (clear) = ascend; true (set) = descend. */
+    private BitSet orderingBits = null;
+   /** Whether the chain has been "locked". */
+    private boolean isLocked = false;
+
+    //-----------------------------------------------------------------------
+    /**
+     * Construct a ComparatorChain with no Comparators.
+     * You must add at least one Comparator before calling
+     * the compare(Object,Object) method, or an
+     * UnsupportedOperationException is thrown
+     */
+    public ComparatorChain() {
+        this(new ArrayList<Comparator<E>>(), new BitSet());
+    }
+
+    /**
+     * Construct a ComparatorChain with a single Comparator,
+     * sorting in the forward order
+     *
+     * @param comparator First comparator in the Comparator chain
+     */
+    public ComparatorChain(final Comparator<E> comparator) {
+        this(comparator, false);
+    }
+
+    /**
+     * Construct a Comparator chain with a single Comparator,
+     * sorting in the given order
+     *
+     * @param comparator First Comparator in the ComparatorChain
+     * @param reverse    false = forward sort; true = reverse sort
+     */
+    public ComparatorChain(final Comparator<E> comparator, final boolean reverse) {
+        comparatorChain = new ArrayList<Comparator<E>>(1);
+        comparatorChain.add(comparator);
+        orderingBits = new BitSet(1);
+        if (reverse == true) {
+            orderingBits.set(0);
+        }
+    }
+
+    /**
+     * Construct a ComparatorChain from the Comparators in the
+     * List.  All Comparators will default to the forward
+     * sort order.
+     *
+     * @param list   List of Comparators
+     * @see #ComparatorChain(List,BitSet)
+     */
+    public ComparatorChain(final List<Comparator<E>> list) {
+        this(list, new BitSet(list.size()));
+    }
+
+    /**
+     * Construct a ComparatorChain from the Comparators in the
+     * given List.  The sort order of each column will be
+     * drawn from the given BitSet.  When determining the sort
+     * order for Comparator at index <i>i</i> in the List,
+     * the ComparatorChain will call BitSet.get(<i>i</i>).
+     * If that method returns <i>false</i>, the forward
+     * sort order is used; a return value of <i>true</i>
+     * indicates reverse sort order.
+     *
+     * @param list   List of Comparators.  NOTE: This constructor does not perform a
+     *               defensive copy of the list
+     * @param bits   Sort order for each Comparator.  Extra bits are ignored,
+     *               unless extra Comparators are added by another method.
+     */
+    public ComparatorChain(final List<Comparator<E>> list, final BitSet bits) {
+        comparatorChain = list;
+        orderingBits = bits;
+    }
+
+    //-----------------------------------------------------------------------
+    /**
+     * Add a Comparator to the end of the chain using the
+     * forward sort order
+     *
+     * @param comparator Comparator with the forward sort order
+     */
+    public void addComparator(final Comparator<E> comparator) {
+        addComparator(comparator, false);
+    }
+
+    /**
+     * Add a Comparator to the end of the chain using the
+     * given sort order
+     *
+     * @param comparator Comparator to add to the end of the chain
+     * @param reverse    false = forward sort order; true = reverse sort order
+     */
+    public void addComparator(final Comparator<E> comparator, final boolean reverse) {
+        checkLocked();
+
+        comparatorChain.add(comparator);
+        if (reverse == true) {
+            orderingBits.set(comparatorChain.size() - 1);
+        }
+    }
+
+    /**
+     * Replace the Comparator at the given index, maintaining
+     * the existing sort order.
+     *
+     * @param index      index of the Comparator to replace
+     * @param comparator Comparator to place at the given index
+     * @exception IndexOutOfBoundsException
+     *                   if index &lt; 0 or index &gt;= size()
+     */
+    public void setComparator(final int index, final Comparator<E> comparator) throws IndexOutOfBoundsException {
+        setComparator(index, comparator, false);
+    }
+
+    /**
+     * Replace the Comparator at the given index in the
+     * ComparatorChain, using the given sort order
+     *
+     * @param index      index of the Comparator to replace
+     * @param comparator Comparator to set
+     * @param reverse    false = forward sort order; true = reverse sort order
+     */
+    public void setComparator(final int index, final Comparator<E> comparator, final boolean reverse) {
+        checkLocked();
+
+        comparatorChain.set(index,comparator);
+        if (reverse == true) {
+            orderingBits.set(index);
+        } else {
+            orderingBits.clear(index);
+        }
+    }
+
+    /**
+     * Change the sort order at the given index in the
+     * ComparatorChain to a forward sort.
+     *
+     * @param index  Index of the ComparatorChain
+     */
+    public void setForwardSort(final int index) {
+        checkLocked();
+        orderingBits.clear(index);
+    }
+
+    /**
+     * Change the sort order at the given index in the
+     * ComparatorChain to a reverse sort.
+     *
+     * @param index  Index of the ComparatorChain
+     */
+    public void setReverseSort(final int index) {
+        checkLocked();
+        orderingBits.set(index);
+    }
+
+    /**
+     * Number of Comparators in the current ComparatorChain.
+     *
+     * @return Comparator count
+     */
+    public int size() {
+        return comparatorChain.size();
+    }
+
+    /**
+     * Determine if modifications can still be made to the
+     * ComparatorChain.  ComparatorChains cannot be modified
+     * once they have performed a comparison.
+     *
+     * @return true = ComparatorChain cannot be modified; false =
+     *         ComparatorChain can still be modified.
+     */
+    public boolean isLocked() {
+        return isLocked;
+    }
+
+    /**
+     * Throws an exception if the {@link ComparatorChain} is locked.
+     *
+     * @throws UnsupportedOperationException if the {@link ComparatorChain} is locked
+     */
+    private void checkLocked() {
+        if (isLocked == true) {
+            throw new UnsupportedOperationException(
+                    "Comparator ordering cannot be changed after the first comparison is performed");
+        }
+    }
+
+    /**
+     * Throws an exception if the {@link ComparatorChain} is empty.
+     *
+     * @throws UnsupportedOperationException if the {@link ComparatorChain} is empty
+     */
+    private void checkChainIntegrity() {
+        if (comparatorChain.size() == 0) {
+            throw new UnsupportedOperationException("ComparatorChains must contain at least one Comparator");
+        }
+    }
+
+    //-----------------------------------------------------------------------
+    /**
+     * Perform comparisons on the Objects as per
+     * Comparator.compare(o1,o2).
+     *
+     * @param o1  the first object to compare
+     * @param o2  the second object to compare
+     * @return -1, 0, or 1
+     * @throws UnsupportedOperationException if the ComparatorChain does not contain at least one Comparator
+     */
+    @Override
+    public int compare(final E o1, final E o2) throws UnsupportedOperationException {
+        if (isLocked == false) {
+            checkChainIntegrity();
+            isLocked = true;
+        }
+
+        // iterate over all comparators in the chain
+        final Iterator<Comparator<E>> comparators = comparatorChain.iterator();
+        for (int comparatorIndex = 0; comparators.hasNext(); ++comparatorIndex) {
+
+            final Comparator<? super E> comparator = comparators.next();
+            int retval = comparator.compare(o1,o2);
+            if (retval != 0) {
+                // invert the order if it is a reverse sort
+                if (orderingBits.get(comparatorIndex) == true) {
+                    if (retval > 0) {
+                        retval = -1;
+                    } else {
+                        retval = 1;
+                    }
+                }
+                return retval;
+            }
+        }
+
+        // if comparators are exhausted, return 0
+        return 0;
+    }
+
+    //-----------------------------------------------------------------------
+    /**
+     * Implement a hash code for this comparator that is consistent with
+     * {@link #equals(Object) equals}.
+     *
+     * @return a suitable hash code
+     * @since 3.0
+     */
+    @Override
+    public int hashCode() {
+        int hash = 0;
+        if (null != comparatorChain) {
+            hash ^= comparatorChain.hashCode();
+        }
+        if (null != orderingBits) {
+            hash ^= orderingBits.hashCode();
+        }
+        return hash;
+    }
+
+    /**
+     * Returns <code>true</code> iff <i>that</i> Object is
+     * is a {@link Comparator} whose ordering is known to be
+     * equivalent to mine.
+     * <p>
+     * This implementation returns <code>true</code>
+     * iff <code><i>object</i>.{@link Object#getClass() getClass()}</code>
+     * equals <code>this.getClass()</code>, and the underlying
+     * comparators and order bits are equal.
+     * Subclasses may want to override this behavior to remain consistent
+     * with the {@link Comparator#equals(Object)} contract.
+     *
+     * @param object  the object to compare with
+     * @return true if equal
+     * @since 3.0
+     */
+    @Override
+    public boolean equals(final Object object) {
+        if (this == object) {
+            return true;
+        }
+        if (null == object) {
+            return false;
+        }
+        if (object.getClass().equals(this.getClass())) {
+            final ComparatorChain<?> chain = (ComparatorChain<?>) object;
+            return (null == orderingBits ? null == chain.orderingBits : orderingBits.equals(chain.orderingBits)) &&
+                   (null == comparatorChain ? null == chain.comparatorChain :
+                                              comparatorChain.equals(chain.comparatorChain));
+        }
+        return false;
+    }
+
+}

fine-commons-collections4/src/com/fr/third/org/apache/commons/collections4/comparators/FixedOrderComparator.java

@@ -0,0 +1,299 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.fr.third.org.apache.commons.collections4.comparators;
+
+import java.io.Serializable;
+import java.util.Comparator;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+/**
+ * A Comparator which imposes a specific order on a specific set of Objects.
+ * Objects are presented to the FixedOrderComparator in a specified order and
+ * subsequent calls to {@link #compare(Object, Object) compare} yield that order.
+ * For example:
+ * <pre>
+ * String[] planets = {"Mercury", "Venus", "Earth", "Mars"};
+ * FixedOrderComparator distanceFromSun = new FixedOrderComparator(planets);
+ * Arrays.sort(planets);                     // Sort to alphabetical order
+ * Arrays.sort(planets, distanceFromSun);    // Back to original order
+ * </pre>
+ * <p>
+ * Once <code>compare</code> has been called, the FixedOrderComparator is locked
+ * and attempts to modify it yield an UnsupportedOperationException.
+ * <p>
+ * Instances of FixedOrderComparator are not synchronized.  The class is not
+ * thread-safe at construction time, but it is thread-safe to perform
+ * multiple comparisons  after all the setup operations are complete.
+ * <p>
+ * This class is Serializable from Commons Collections 4.0.
+ *
+ * @since 3.0
+ * @version $Id: FixedOrderComparator.java 1686855 2015-06-22 13:00:27Z tn $
+ */
+public class FixedOrderComparator<T> implements Comparator<T>, Serializable {
+
+    /** Serialization version from Collections 4.0. */
+    private static final long serialVersionUID = 82794675842863201L;
+
+    /**
+     * Unknown object behavior enum.
+     * @since 4.0
+     */
+    public static enum UnknownObjectBehavior {
+        BEFORE, AFTER, EXCEPTION;
+    }
+
+    /** Internal map of object to position */
+    private final Map<T, Integer> map = new HashMap<T, Integer>();
+
+    /** Counter used in determining the position in the map */
+    private int counter = 0;
+
+    /** Is the comparator locked against further change */
+    private boolean isLocked = false;
+
+    /** The behaviour in the case of an unknown object */
+    private UnknownObjectBehavior unknownObjectBehavior = UnknownObjectBehavior.EXCEPTION;
+
+    // Constructors
+    //-----------------------------------------------------------------------
+    /**
+     * Constructs an empty FixedOrderComparator.
+     */
+    public FixedOrderComparator() {
+        super();
+    }
+
+    /**
+     * Constructs a FixedOrderComparator which uses the order of the given array
+     * to compare the objects.
+     * <p>
+     * The array is copied, so later changes will not affect the comparator.
+     *
+     * @param items  the items that the comparator can compare in order
+     * @throws NullPointerException if the array is null
+     */
+    public FixedOrderComparator(final T... items) {
+        super();
+        if (items == null) {
+            throw new NullPointerException("The list of items must not be null");
+        }
+        for (final T item : items) {
+            add(item);
+        }
+    }
+
+    /**
+     * Constructs a FixedOrderComparator which uses the order of the given list
+     * to compare the objects.
+     * <p>
+     * The list is copied, so later changes will not affect the comparator.
+     *
+     * @param items  the items that the comparator can compare in order
+     * @throws NullPointerException if the list is null
+     */
+    public FixedOrderComparator(final List<T> items) {
+        super();
+        if (items == null) {
+            throw new NullPointerException("The list of items must not be null");
+        }
+        for (final T t : items) {
+            add(t);
+        }
+    }
+
+    // Bean methods / state querying methods
+    //-----------------------------------------------------------------------
+    /**
+     * Returns true if modifications cannot be made to the FixedOrderComparator.
+     * FixedOrderComparators cannot be modified once they have performed a comparison.
+     *
+     * @return true if attempts to change the FixedOrderComparator yield an
+     *  UnsupportedOperationException, false if it can be changed.
+     */
+    public boolean isLocked() {
+        return isLocked;
+    }
+
+    /**
+     * Checks to see whether the comparator is now locked against further changes.
+     *
+     * @throws UnsupportedOperationException if the comparator is locked
+     */
+    protected void checkLocked() {
+        if (isLocked()) {
+            throw new UnsupportedOperationException("Cannot modify a FixedOrderComparator after a comparison");
+        }
+    }
+
+    /**
+     * Gets the behavior for comparing unknown objects.
+     *
+     * @return {@link UnknownObjectBehavior}
+     */
+    public UnknownObjectBehavior getUnknownObjectBehavior() {
+        return unknownObjectBehavior;
+    }
+
+    /**
+     * Sets the behavior for comparing unknown objects.
+     *
+     * @param unknownObjectBehavior  the flag for unknown behaviour -
+     * UNKNOWN_AFTER, UNKNOWN_BEFORE or UNKNOWN_THROW_EXCEPTION
+     * @throws UnsupportedOperationException if a comparison has been performed
+     * @throws NullPointerException if unknownObjectBehavior is null
+     */
+    public void setUnknownObjectBehavior(final UnknownObjectBehavior unknownObjectBehavior) {
+        checkLocked();
+        if (unknownObjectBehavior == null) {
+            throw new NullPointerException("Unknown object behavior must not be null");
+        }
+        this.unknownObjectBehavior = unknownObjectBehavior;
+    }
+
+    // Methods for adding items
+    //-----------------------------------------------------------------------
+    /**
+     * Adds an item, which compares as after all items known to the Comparator.
+     * If the item is already known to the Comparator, its old position is
+     * replaced with the new position.
+     *
+     * @param obj  the item to be added to the Comparator.
+     * @return true if obj has been added for the first time, false if
+     *  it was already known to the Comparator.
+     * @throws UnsupportedOperationException if a comparison has already been made
+     */
+    public boolean add(final T obj) {
+        checkLocked();
+        final Integer position = map.put(obj, Integer.valueOf(counter++));
+        return position == null;
+    }
+
+    /**
+     * Adds a new item, which compares as equal to the given existing item.
+     *
+     * @param existingObj  an item already in the Comparator's set of
+     *  known objects
+     * @param newObj  an item to be added to the Comparator's set of
+     *  known objects
+     * @return true if newObj has been added for the first time, false if
+     *  it was already known to the Comparator.
+     * @throws IllegalArgumentException if existingObject is not in the
+     *  Comparator's set of known objects.
+     * @throws UnsupportedOperationException if a comparison has already been made
+     */
+    public boolean addAsEqual(final T existingObj, final T newObj) {
+        checkLocked();
+        final Integer position = map.get(existingObj);
+        if (position == null) {
+            throw new IllegalArgumentException(existingObj + " not known to " + this);
+        }
+        final Integer result = map.put(newObj, position);
+        return result == null;
+    }
+
+    // Comparator methods
+    //-----------------------------------------------------------------------
+    /**
+     * Compares two objects according to the order of this Comparator.
+     * <p>
+     * It is important to note that this class will throw an IllegalArgumentException
+     * in the case of an unrecognised object. This is not specified in the
+     * Comparator interface, but is the most appropriate exception.
+     *
+     * @param obj1  the first object to compare
+     * @param obj2  the second object to compare
+     * @return negative if obj1 is less, positive if greater, zero if equal
+     * @throws IllegalArgumentException if obj1 or obj2 are not known
+     *  to this Comparator and an alternative behavior has not been set
+     *  via {@link #setUnknownObjectBehavior(UnknownObjectBehavior)}.
+     */
+    @Override
+    public int compare(final T obj1, final T obj2) {
+        isLocked = true;
+        final Integer position1 = map.get(obj1);
+        final Integer position2 = map.get(obj2);
+        if (position1 == null || position2 == null) {
+            switch (unknownObjectBehavior) {
+            case BEFORE:
+                return position1 == null ? position2 == null ? 0 : -1 : 1;
+            case AFTER:
+                return position1 == null ? position2 == null ? 0 : 1 : -1;
+            case EXCEPTION:
+                final Object unknownObj = position1 == null ? obj1 : obj2;
+                throw new IllegalArgumentException("Attempting to compare unknown object "
+                        + unknownObj);
+            default: //could be null
+                throw new UnsupportedOperationException("Unknown unknownObjectBehavior: "
+                        + unknownObjectBehavior);
+            }
+        }
+        return position1.compareTo(position2);
+    }
+
+    //-----------------------------------------------------------------------
+    /**
+     * Implement a hash code for this comparator that is consistent with
+     * {@link #equals(Object) equals}.
+     *
+     * @return a hash code for this comparator.
+     */
+    @Override
+    public int hashCode() {
+        int total = 17;
+        total = total*37 + (map == null ? 0 : map.hashCode());
+        total = total*37 + (unknownObjectBehavior == null ? 0 : unknownObjectBehavior.hashCode());
+        total = total*37 + counter;
+        total = total*37 + (isLocked ? 0 : 1);
+        return total;
+    }
+
+    /**
+     * Returns <code>true</code> iff <i>that</i> Object is
+     * is a {@link Comparator} whose ordering is known to be
+     * equivalent to mine.
+     * <p>
+     * This implementation returns <code>true</code>
+     * iff <code><i>that</i></code> is a {@link FixedOrderComparator}
+     * whose attributes are equal to mine.
+     *
+     * @param object  the object to compare to
+     * @return true if equal
+     */
+    @Override
+    public boolean equals(final Object object) {
+        if (this == object) {
+            return true;
+        }
+        if (null == object) {
+            return false;
+        }
+        if (object.getClass().equals(this.getClass())) {
+            final FixedOrderComparator<?> comp = (FixedOrderComparator<?>) object;
+            return (null == map ? null == comp.map : map.equals(comp.map)) &&
+                   (null == unknownObjectBehavior ? null == comp.unknownObjectBehavior :
+                        unknownObjectBehavior == comp.unknownObjectBehavior &&
+                        counter == comp.counter &&
+                        isLocked == comp.isLocked &&
+                        unknownObjectBehavior == comp.unknownObjectBehavior);
+        }
+        return false;
+    }
+
+}

fine-commons-collections4/src/com/fr/third/org/apache/commons/collections4/comparators/NullComparator.java

@@ -0,0 +1,182 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.fr.third.org.apache.commons.collections4.comparators;
+
+import java.io.Serializable;
+import java.util.Comparator;
+
+import com.fr.third.org.apache.commons.collections4.ComparatorUtils;
+import com.fr.third.org.apache.commons.collections4.ComparatorUtils;
+
+/**
+ * A Comparator that will compare nulls to be either lower or higher than
+ * other objects.
+ *
+ * @since 2.0
+ * @version $Id: NullComparator.java 1683951 2015-06-06 20:19:03Z tn $
+ */
+public class NullComparator<E> implements Comparator<E>, Serializable {
+
+    /** Serialization version. */
+    private static final long serialVersionUID = -5820772575483504339L;
+
+    /**
+     *  The comparator to use when comparing two non-<code>null</code> objects.
+     **/
+    private final Comparator<? super E> nonNullComparator;
+
+    /**
+     *  Specifies whether a <code>null</code> are compared as higher than
+     *  non-<code>null</code> objects.
+     **/
+    private final boolean nullsAreHigh;
+
+    //-----------------------------------------------------------------------
+    /**
+     *  Construct an instance that sorts <code>null</code> higher than any
+     *  non-<code>null</code> object it is compared with. When comparing two
+     *  non-<code>null</code> objects, the {@link ComparableComparator} is
+     *  used.
+     **/
+    @SuppressWarnings("unchecked")
+    public NullComparator() {
+        this(ComparatorUtils.NATURAL_COMPARATOR, true);
+    }
+
+    /**
+     *  Construct an instance that sorts <code>null</code> higher than any
+     *  non-<code>null</code> object it is compared with.  When comparing two
+     *  non-<code>null</code> objects, the specified {@link Comparator} is
+     *  used.
+     *
+     *  @param nonNullComparator the comparator to use when comparing two
+     *  non-<code>null</code> objects.  This argument cannot be
+     *  <code>null</code>
+     *
+     *  @exception NullPointerException if <code>nonNullComparator</code> is
+     *  <code>null</code>
+     **/
+    public NullComparator(final Comparator<? super E> nonNullComparator) {
+        this(nonNullComparator, true);
+    }
+
+    /**
+     *  Construct an instance that sorts <code>null</code> higher or lower than
+     *  any non-<code>null</code> object it is compared with.  When comparing
+     *  two non-<code>null</code> objects, the {@link ComparableComparator} is
+     *  used.
+     *
+     *  @param nullsAreHigh a <code>true</code> value indicates that
+     *  <code>null</code> should be compared as higher than a
+     *  non-<code>null</code> object.  A <code>false</code> value indicates
+     *  that <code>null</code> should be compared as lower than a
+     *  non-<code>null</code> object.
+     **/
+    @SuppressWarnings("unchecked")
+    public NullComparator(final boolean nullsAreHigh) {
+        this(ComparatorUtils.NATURAL_COMPARATOR, nullsAreHigh);
+    }
+
+    /**
+     *  Construct an instance that sorts <code>null</code> higher or lower than
+     *  any non-<code>null</code> object it is compared with.  When comparing
+     *  two non-<code>null</code> objects, the specified {@link Comparator} is
+     *  used.
+     *
+     *  @param nonNullComparator the comparator to use when comparing two
+     *  non-<code>null</code> objects. This argument cannot be
+     *  <code>null</code>
+     *
+     *  @param nullsAreHigh a <code>true</code> value indicates that
+     *  <code>null</code> should be compared as higher than a
+     *  non-<code>null</code> object.  A <code>false</code> value indicates
+     *  that <code>null</code> should be compared as lower than a
+     *  non-<code>null</code> object.
+     *
+     *  @exception NullPointerException if <code>nonNullComparator</code> is
+     *  <code>null</code>
+     **/
+    public NullComparator(final Comparator<? super E> nonNullComparator, final boolean nullsAreHigh) {
+        this.nonNullComparator = nonNullComparator;
+        this.nullsAreHigh = nullsAreHigh;
+
+        if (nonNullComparator == null) {
+            throw new NullPointerException("null nonNullComparator");
+        }
+    }
+
+    //-----------------------------------------------------------------------
+    /**
+     *  Perform a comparison between two objects.  If both objects are
+     *  <code>null</code>, a <code>0</code> value is returned.  If one object
+     *  is <code>null</code> and the other is not, the result is determined on
+     *  whether the Comparator was constructed to have nulls as higher or lower
+     *  than other objects.  If neither object is <code>null</code>, an
+     *  underlying comparator specified in the constructor (or the default) is
+     *  used to compare the non-<code>null</code> objects.
+     *
+     *  @param o1  the first object to compare
+     *  @param o2  the object to compare it to.
+     *  @return <code>-1</code> if <code>o1</code> is "lower" than (less than,
+     *  before, etc.) <code>o2</code>; <code>1</code> if <code>o1</code> is
+     *  "higher" than (greater than, after, etc.) <code>o2</code>; or
+     *  <code>0</code> if <code>o1</code> and <code>o2</code> are equal.
+     **/
+    @Override
+    public int compare(final E o1, final E o2) {
+        if(o1 == o2) { return 0; }
+        if(o1 == null) { return this.nullsAreHigh ? 1 : -1; }
+        if(o2 == null) { return this.nullsAreHigh ? -1 : 1; }
+        return this.nonNullComparator.compare(o1, o2);
+    }
+
+    //-----------------------------------------------------------------------
+    /**
+     *  Implement a hash code for this comparator that is consistent with
+     *  {@link #equals(Object)}.
+     *
+     *  @return a hash code for this comparator.
+     **/
+    @Override
+    public int hashCode() {
+        return (nullsAreHigh ? -1 : 1) * nonNullComparator.hashCode();
+    }
+
+    /**
+     *  Determines whether the specified object represents a comparator that is
+     *  equal to this comparator.
+     *
+     *  @param obj  the object to compare this comparator with.
+     *
+     *  @return <code>true</code> if the specified object is a NullComparator
+     *  with equivalent <code>null</code> comparison behavior
+     *  (i.e. <code>null</code> high or low) and with equivalent underlying
+     *  non-<code>null</code> object comparators.
+     **/
+    @Override
+    public boolean equals(final Object obj) {
+        if(obj == null) { return false; }
+        if(obj == this) { return true; }
+        if(!obj.getClass().equals(this.getClass())) { return false; }
+
+        final NullComparator<?> other = (NullComparator<?>) obj;
+
+        return this.nullsAreHigh == other.nullsAreHigh &&
+                this.nonNullComparator.equals(other.nonNullComparator);
+    }
+
+}

fine-commons-collections4/src/com/fr/third/org/apache/commons/collections4/comparators/ReverseComparator.java

@@ -0,0 +1,125 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.fr.third.org.apache.commons.collections4.comparators;
+
+import java.io.Serializable;
+import java.util.Comparator;
+
+import com.fr.third.org.apache.commons.collections4.ComparatorUtils;
+import com.fr.third.org.apache.commons.collections4.ComparatorUtils;
+
+/**
+ * Reverses the order of another comparator by reversing the arguments
+ * to its {@link #compare(Object, Object) compare} method.
+ *
+ * @since 2.0
+ * @version $Id: ReverseComparator.java 1683951 2015-06-06 20:19:03Z tn $
+ *
+ * @see java.util.Collections#reverseOrder()
+ */
+public class ReverseComparator<E> implements Comparator<E>, Serializable {
+
+    /** Serialization version from Collections 2.0. */
+    private static final long serialVersionUID = 2858887242028539265L;
+
+    /** The comparator being decorated. */
+    private final Comparator<? super E> comparator;
+
+    //-----------------------------------------------------------------------
+    /**
+     * Creates a comparator that compares objects based on the inverse of their
+     * natural ordering.  Using this Constructor will create a ReverseComparator
+     * that is functionally identical to the Comparator returned by
+     * java.util.Collections.<b>reverseOrder()</b>.
+     *
+     * @see java.util.Collections#reverseOrder()
+     */
+    public ReverseComparator() {
+        this(null);
+    }
+
+    /**
+     * Creates a comparator that inverts the comparison
+     * of the given comparator.  If you pass in <code>null</code>,
+     * the ReverseComparator defaults to reversing the
+     * natural order, as per {@link java.util.Collections#reverseOrder()}.
+     *
+     * @param comparator Comparator to reverse
+     */
+    @SuppressWarnings("unchecked")
+    public ReverseComparator(final Comparator<? super E> comparator) {
+        this.comparator = comparator == null ? ComparatorUtils.NATURAL_COMPARATOR : comparator;
+    }
+
+    //-----------------------------------------------------------------------
+    /**
+     * Compares two objects in reverse order.
+     *
+     * @param obj1  the first object to compare
+     * @param obj2  the second object to compare
+     * @return negative if obj1 is less, positive if greater, zero if equal
+     */
+    @Override
+    public int compare(final E obj1, final E obj2) {
+        return comparator.compare(obj2, obj1);
+    }
+
+    //-----------------------------------------------------------------------
+    /**
+     * Implement a hash code for this comparator that is consistent with
+     * {@link #equals(Object) equals}.
+     *
+     * @return a suitable hash code
+     * @since 3.0
+     */
+    @Override
+    public int hashCode() {
+        return "ReverseComparator".hashCode() ^ comparator.hashCode();
+    }
+
+    /**
+     * Returns <code>true</code> iff <i>that</i> Object is
+     * is a {@link Comparator} whose ordering is known to be
+     * equivalent to mine.
+     * <p>
+     * This implementation returns <code>true</code>
+     * iff <code><i>object</i>.{@link Object#getClass() getClass()}</code>
+     * equals <code>this.getClass()</code>, and the underlying
+     * comparators are equal.
+     * Subclasses may want to override this behavior to remain consistent
+     * with the {@link Comparator#equals(Object) equals} contract.
+     *
+     * @param object  the object to compare to
+     * @return true if equal
+     * @since 3.0
+     */
+    @Override
+    public boolean equals(final Object object) {
+        if (this == object) {
+            return true;
+        }
+        if (null == object) {
+            return false;
+        }
+        if (object.getClass().equals(this.getClass())) {
+            final ReverseComparator<?> thatrc = (ReverseComparator<?>) object;
+            return comparator.equals(thatrc.comparator);
+        }
+        return false;
+    }
+
+}

fine-commons-collections4/src/com/fr/third/org/apache/commons/collections4/comparators/TransformingComparator.java

@@ -0,0 +1,133 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.fr.third.org.apache.commons.collections4.comparators;
+
+import java.io.Serializable;
+import java.util.Comparator;
+
+import com.fr.third.org.apache.commons.collections4.ComparatorUtils;
+import com.fr.third.org.apache.commons.collections4.Transformer;
+import com.fr.third.org.apache.commons.collections4.ComparatorUtils;
+import com.fr.third.org.apache.commons.collections4.Transformer;
+
+/**
+ * Decorates another Comparator with transformation behavior. That is, the
+ * return value from the transform operation will be passed to the decorated
+ * {@link Comparator#compare(Object,Object) compare} method.
+ * <p>
+ * This class is Serializable from Commons Collections 4.0.
+ *
+ * @since 2.1
+ * @version $Id: TransformingComparator.java 1683951 2015-06-06 20:19:03Z tn $
+ *
+ * @see Transformer
+ * @see org.apache.commons.collections4.comparators.ComparableComparator
+ */
+public class TransformingComparator<I, O> implements Comparator<I>, Serializable {
+
+    /** Serialization version from Collections 4.0. */
+    private static final long serialVersionUID = 3456940356043606220L;
+
+    /** The decorated comparator. */
+    private final Comparator<O> decorated;
+    /** The transformer being used. */
+    private final Transformer<? super I, ? extends O> transformer;
+
+    //-----------------------------------------------------------------------
+    /**
+     * Constructs an instance with the given Transformer and a
+     * {@link ComparableComparator ComparableComparator}.
+     *
+     * @param transformer what will transform the arguments to <code>compare</code>
+     */
+    @SuppressWarnings("unchecked")
+    public TransformingComparator(final Transformer<? super I, ? extends O> transformer) {
+        this(transformer, ComparatorUtils.NATURAL_COMPARATOR);
+    }
+
+    /**
+     * Constructs an instance with the given Transformer and Comparator.
+     *
+     * @param transformer  what will transform the arguments to <code>compare</code>
+     * @param decorated  the decorated Comparator
+     */
+    public TransformingComparator(final Transformer<? super I, ? extends O> transformer,
+                                  final Comparator<O> decorated) {
+        this.decorated = decorated;
+        this.transformer = transformer;
+    }
+
+    //-----------------------------------------------------------------------
+    /**
+     * Returns the result of comparing the values from the transform operation.
+     *
+     * @param obj1  the first object to transform then compare
+     * @param obj2  the second object to transform then compare
+     * @return negative if obj1 is less, positive if greater, zero if equal
+     */
+    @Override
+    public int compare(final I obj1, final I obj2) {
+        final O value1 = this.transformer.transform(obj1);
+        final O value2 = this.transformer.transform(obj2);
+        return this.decorated.compare(value1, value2);
+    }
+
+    //-----------------------------------------------------------------------
+    /**
+     * Implement a hash code for this comparator that is consistent with
+     * {@link #equals(Object) equals}.
+     *
+     * @return a hash code for this comparator.
+     */
+    @Override
+    public int hashCode() {
+        int total = 17;
+        total = total*37 + (decorated == null ? 0 : decorated.hashCode());
+        total = total*37 + (transformer == null ? 0 : transformer.hashCode());
+        return total;
+    }
+
+    /**
+     * Returns <code>true</code> iff <i>that</i> Object is
+     * is a {@link Comparator} whose ordering is known to be
+     * equivalent to mine.
+     * <p>
+     * This implementation returns <code>true</code>
+     * iff <code><i>that</i></code> is a {@link TransformingComparator}
+     * whose attributes are equal to mine.
+     *
+     * @param object  the object to compare to
+     * @return true if equal
+     */
+    @Override
+    public boolean equals(final Object object) {
+        if (this == object) {
+            return true;
+        }
+        if (null == object) {
+            return false;
+        }
+        if (object.getClass().equals(this.getClass())) {
+            final TransformingComparator<?, ?> comp = (TransformingComparator<?, ?>) object;
+            return (null == decorated ? null == comp.decorated : decorated.equals(comp.decorated)) &&
+                   (null == transformer ? null == comp.transformer : transformer.equals(comp.transformer));
+        }
+        return false;
+    }
+
+}
+

fine-commons-collections4/src/com/fr/third/org/apache/commons/collections4/comparators/package-info.java

@@ -0,0 +1,28 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+/**
+ * This package contains implementations of the
+ * {@link java.util.Comparator Comparator} interface.
+ * <p>
+ * You may also consider using
+ * {@link com.fr.third.org.apache.commons.collections4.ComparatorUtils ComparatorUtils},
+ * which is a single class that uses static methods to construct instances
+ * of the classes in this package.
+ *
+ * @version $Id: package-info.java 1477747 2013-04-30 18:16:48Z tn $
+ */
+package com.fr.third.org.apache.commons.collections4.comparators;

fine-commons-collections4/src/com/fr/third/org/apache/commons/collections4/functors/AbstractQuantifierPredicate.java

@@ -0,0 +1,56 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.fr.third.org.apache.commons.collections4.functors;
+
+import java.io.Serializable;
+
+import com.fr.third.org.apache.commons.collections4.Predicate;
+
+/**
+ * Abstract base class for quantification predicates, e.g. All, Any, None.
+ *
+ * @since 4.0
+ * @version $Id: AbstractQuantifierPredicate.java 1543167 2013-11-18 21:21:32Z ggregory $
+ */
+public abstract class AbstractQuantifierPredicate<T> implements PredicateDecorator<T>, Serializable {
+
+    /** Serial version UID */
+    private static final long serialVersionUID = -3094696765038308799L;
+
+    /** The array of predicates to call */
+    protected final Predicate<? super T>[] iPredicates;
+
+    /**
+     * Constructor that performs no validation.
+     *
+     * @param predicates  the predicates to check, not cloned, not null
+     */
+    public AbstractQuantifierPredicate(final Predicate<? super T>... predicates) {
+        iPredicates = predicates;
+    }
+
+    /**
+     * Gets the predicates.
+     *
+     * @return a copy of the predicates
+     * @since 3.1
+     */
+    public Predicate<? super T>[] getPredicates() {
+        return FunctorUtils.<T>copy(iPredicates);
+    }
+
+}