Improve IndexDiff performance

Exclude ignored files from IndexDiff tree walk.
This makes EGit commit much faster.

Change-Id: I398499510c22c37667b7612db32eac3b31d325f0
Signed-off-by: Jens Baumgart <jens.baumgart@sap.com>
Signed-off-by: Chris Aniszczyk <caniszczyk@gmail.com>

org.eclipse.jgit/src/org/eclipse/jgit/lib/IndexDiff.java

@@ -56,6 +56,8 @@ import org.eclipse.jgit.treewalk.AbstractTreeIterator;
 import org.eclipse.jgit.treewalk.EmptyTreeIterator;
 import org.eclipse.jgit.treewalk.TreeWalk;
 import org.eclipse.jgit.treewalk.WorkingTreeIterator;
+import org.eclipse.jgit.treewalk.filter.AndTreeFilter;
+import org.eclipse.jgit.treewalk.filter.NotIgnoredFilter;
 import org.eclipse.jgit.treewalk.filter.TreeFilter;
 
 /**
@@ -158,6 +160,8 @@ public class IndexDiff {
 		treeWalk.addTree(new DirCacheIterator(dirCache));
 		treeWalk.addTree(initialWorkingTreeIterator);
 		treeWalk.setFilter(TreeFilter.ANY_DIFF);
+		treeWalk.setFilter(AndTreeFilter.create(TreeFilter.ANY_DIFF,
+				new NotIgnoredFilter(WORKDIR)));
 		while (treeWalk.next()) {
 			AbstractTreeIterator treeIterator = treeWalk.getTree(TREE,
 					AbstractTreeIterator.class);
@@ -255,4 +259,5 @@ public class IndexDiff {
 	public HashSet<String> getUntracked() {
 		return untracked;
 	}
+
 }

org.eclipse.jgit/src/org/eclipse/jgit/treewalk/filter/NotIgnoredFilter.java

@@ -0,0 +1,92 @@
+/*
+ * Copyright (C) 2010, Jens Baumgart <jens.baumgart@sap.com>
+ * and other copyright owners as documented in the project's IP log.
+ *
+ * This program and the accompanying materials are made available
+ * under the terms of the Eclipse Distribution License v1.0 which
+ * accompanies this distribution, is reproduced below, and is
+ * available at http://www.eclipse.org/org/documents/edl-v10.php
+ *
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or
+ * without modification, are permitted provided that the following
+ * conditions are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ *
+ * - Redistributions in binary form must reproduce the above
+ *   copyright notice, this list of conditions and the following
+ *   disclaimer in the documentation and/or other materials provided
+ *   with the distribution.
+ *
+ * - Neither the name of the Eclipse Foundation, Inc. nor the
+ *   names of its contributors may be used to endorse or promote
+ *   products derived from this software without specific prior
+ *   written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
+ * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
+ * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+package org.eclipse.jgit.treewalk.filter;
+
+import java.io.IOException;
+
+import org.eclipse.jgit.errors.IncorrectObjectTypeException;
+import org.eclipse.jgit.errors.MissingObjectException;
+import org.eclipse.jgit.treewalk.TreeWalk;
+import org.eclipse.jgit.treewalk.WorkingTreeIterator;
+
+/**
+ * This filter includes workdir entries that are not ignored. This class is
+ * immutable.
+ */
+public class NotIgnoredFilter extends TreeFilter {
+
+	private final int workdirTreeIndex;
+
+	/**
+	 * constructor
+	 *
+	 * @param workdirTreeIndex
+	 *            index of the workdir tree in the tree walk
+	 */
+	public NotIgnoredFilter(final int workdirTreeIndex) {
+		this.workdirTreeIndex = workdirTreeIndex;
+	}
+
+	@Override
+	public boolean include(TreeWalk walker) throws MissingObjectException,
+			IncorrectObjectTypeException, IOException {
+		WorkingTreeIterator workingTreeIterator = walker.getTree(
+				workdirTreeIndex, WorkingTreeIterator.class);
+		if (workingTreeIterator != null)
+			// do not include ignored entries
+			return !workingTreeIterator.isEntryIgnored();
+		return true;
+	}
+
+	@Override
+	public boolean shouldBeRecursive() {
+		return false;
+	}
+
+	@Override
+	public TreeFilter clone() {
+		// immutable
+		return this;
+	}
+
+}