Fixed JsonPath compliance issue.

see http://code.google.com/p/json-path/issues/detail?id=7

json-path/src/main/java/com/jayway/jsonpath/JsonPath.java

@@ -3,6 +3,7 @@ package com.jayway.jsonpath;
 
 import com.jayway.jsonpath.reader.PathToken;
 import com.jayway.jsonpath.reader.PathTokenizer;
+import com.jayway.jsonpath.reader.filter.Filter;
 import com.jayway.jsonpath.spi.JsonProvider;
 
 import java.util.List;
@@ -149,8 +150,16 @@ public class JsonPath {
 
         Object result = container;
 
+        boolean inArrayContext = false;
+
         for (PathToken pathToken : tokenizer) {
-            result = pathToken.filter(result, jsonProvider);
+            Filter filter = pathToken.getFilter();
+            result = filter.filter(result, jsonProvider, inArrayContext);
+
+            if (!inArrayContext) {
+                inArrayContext = filter.isArrayFilter();
+            }
+            //result = pathToken.filter(result, jsonProvider);
         }
         return (T) result;
     }

json-path/src/main/java/com/jayway/jsonpath/reader/PathToken.java

@@ -1,5 +1,6 @@
 package com.jayway.jsonpath.reader;
 
+import com.jayway.jsonpath.reader.filter.Filter;
 import com.jayway.jsonpath.reader.filter.FilterFactory;
 import com.jayway.jsonpath.spi.JsonProvider;
 
@@ -17,6 +18,10 @@ public class PathToken {
         this.fragment = fragment;
     }
 
+    public Filter getFilter(){
+        return FilterFactory.createFilter(fragment);
+    }
+
     public Object filter(Object model, JsonProvider jsonProvider){
         return FilterFactory.createFilter(fragment).filter(model, jsonProvider);
     }

json-path/src/main/java/com/jayway/jsonpath/reader/filter/ArrayEvalFilter.java

@@ -48,6 +48,11 @@ public class ArrayEvalFilter extends Filter {
         return result;
     }
 
+    @Override
+    public boolean isArrayFilter() {
+        return true;
+    }
+
     private boolean isMatch(Object check, ConditionStatement conditionStatement, JsonProvider jsonProvider) {
         if (!jsonProvider.isMap(check)) {
             return false;

json-path/src/main/java/com/jayway/jsonpath/reader/filter/ArrayIndexFilter.java

@@ -58,4 +58,9 @@ public class ArrayIndexFilter extends Filter {
             }
         }
     }
+
+    @Override
+    public boolean isArrayFilter() {
+        return true;
+    }
 }

json-path/src/main/java/com/jayway/jsonpath/reader/filter/FieldFilter.java

@@ -17,8 +17,38 @@ public class FieldFilter extends Filter {
         super(condition);
     }
 
+    @Override
+    public Object filter(Object obj, JsonProvider jsonProvider, boolean inArrayContext) {
+        if (jsonProvider.isList(obj)) {
+            if (!inArrayContext) {
+                return null;
+            } else {
+                List<Object> result = jsonProvider.createList();
+                for (Object current : jsonProvider.toList(obj)) {
+                    if (jsonProvider.isMap(current)) {
+                        Map<String, Object> map = jsonProvider.toMap(current);
+                        if (map.containsKey(condition)) {
+                            Object o = map.get(condition);
+                            if (jsonProvider.isList(o)) {
+                                result.addAll(jsonProvider.toList(o));
+                            } else {
+                                result.add(map.get(condition));
+                            }
+                        }
+                    }
+                }
+                return result;
+            }
+        } else {
+            return jsonProvider.getMapValue(obj, condition);
+        }
+    }
+
+
     public Object filter(Object obj, JsonProvider jsonProvider) {
         if (jsonProvider.isList(obj)) {
+            return obj;
+            /*
             List<Object> result = jsonProvider.createList();
             for (Object current : jsonProvider.toList(obj)) {
                 if (jsonProvider.isMap(current)) {
@@ -34,8 +64,16 @@ public class FieldFilter extends Filter {
                 }
             }
             return result;
+            */
         } else {
             return jsonProvider.getMapValue(obj, condition);
         }
     }
+
+    @Override
+    public boolean isArrayFilter() {
+        return false;
+    }
+
+
 }

json-path/src/main/java/com/jayway/jsonpath/reader/filter/Filter.java

@@ -29,6 +29,14 @@ public abstract class Filter {
         return res;
     }
 
+    public Object filter(Object obj, JsonProvider jsonProvider, boolean inArrayContext){
+        return filter(obj, jsonProvider);
+    }
+
     public abstract Object filter(Object obj, JsonProvider jsonProvider);
 
+
+
+    public abstract boolean isArrayFilter();
+
 }

json-path/src/main/java/com/jayway/jsonpath/reader/filter/FilterFactory.java

@@ -8,8 +8,8 @@ package com.jayway.jsonpath.reader.filter;
  */
 public class FilterFactory {
 
-    private final static Filter DOCUMENT_FILTER = new PassThrewFilter("$");
+    private final static Filter DOCUMENT_FILTER = new PassThrewFilter("$", false);
-    private final static Filter ALL_ARRAY_ITEMS_FILTER = new PassThrewFilter("[*]");
+    private final static Filter ALL_ARRAY_ITEMS_FILTER = new PassThrewFilter("[*]", true);
     private final static Filter WILDCARD_FILTER = new WildcardFilter("*");
     private final static Filter SCAN_FILTER = new ScanFilter("..");
 

json-path/src/main/java/com/jayway/jsonpath/reader/filter/HasFieldFilter.java

@@ -43,4 +43,9 @@ public class HasFieldFilter extends Filter {
         }
         return result;
     }
+
+    @Override
+    public boolean isArrayFilter() {
+        return true;
+    }
 }

json-path/src/main/java/com/jayway/jsonpath/reader/filter/PassThrewFilter.java

@@ -10,11 +10,19 @@ import com.jayway.jsonpath.spi.JsonProvider;
  */
 public class PassThrewFilter extends Filter {
 
-    public PassThrewFilter(String condition) {
+    private boolean isArrayFilter;
+
+    public PassThrewFilter(String condition, boolean isArrayFilter) {
         super(condition);
+        this.isArrayFilter = isArrayFilter;
     }
 
     public Object filter(Object obj, JsonProvider jsonProvider) {
         return obj;
     }
+
+    @Override
+    public boolean isArrayFilter() {
+        return isArrayFilter;
+    }
 }

json-path/src/main/java/com/jayway/jsonpath/reader/filter/ScanFilter.java

@@ -25,6 +25,11 @@ public class ScanFilter extends Filter {
         return result;
     }
 
+    @Override
+    public boolean isArrayFilter() {
+        return true;
+    }
+
 
     private void scan(Object container, List<Object> result, JsonProvider jsonProvider) {
 

json-path/src/main/java/com/jayway/jsonpath/reader/filter/WildcardFilter.java

@@ -33,4 +33,9 @@ public class WildcardFilter extends Filter {
         }
         return result;
     }
+
+    @Override
+    public boolean isArrayFilter() {
+        return true;
+    }
 }

json-path/src/test/java/com/jayway/jsonpath/Issues.java

@@ -0,0 +1,27 @@
+package com.jayway.jsonpath;
+
+import org.junit.Test;
+
+import static junit.framework.Assert.assertNull;
+
+/**
+ * Created by IntelliJ IDEA.
+ * User: kallestenflo
+ * Date: 2/29/12
+ * Time: 8:42 AM
+ */
+public class Issues {
+    @Test
+    public void issue_7() throws Exception {
+
+        String json = "{ \"foo\" : [\n" +
+                "  { \"id\": 1 },  \n" +
+                "  { \"id\": 2 },  \n" +
+                "  { \"id\": 3 }\n" +
+                "  ] }";
+
+
+        assertNull(JsonPath.read(json, "$.foo.id"));
+    }
+
+}

json-path/src/test/java/com/jayway/jsonpath/JsonPathTest.java

@@ -77,7 +77,8 @@ public class JsonPathTest {
 
     @Test
     public void array_start_expands() throws Exception {
-        assertThat(JsonPath.<List<String>>read(ARRAY_EXPAND, "$[?(@.parent = 'ONE')].child.name"), hasItems("NAME_ONE"));
+        //assertThat(JsonPath.<List<String>>read(ARRAY_EXPAND, "$[?(@.parent = 'ONE')].child.name"), hasItems("NAME_ONE"));
+        assertThat(JsonPath.<List<String>>read(ARRAY_EXPAND, "$[?(@['parent'] = 'ONE')].child.name"), hasItems("NAME_ONE"));
     }
 
     @Test

json-path/src/test/java/com/jayway/jsonpath/PathTokenizerTest.java

@@ -1,170 +0,0 @@
-package com.jayway.jsonpath;
-
-import com.jayway.jsonpath.reader.PathToken;
-import com.jayway.jsonpath.reader.PathTokenizer;
-import com.jayway.jsonpath.spi.JsonProvider;
-import org.junit.Test;
-
-import java.util.List;
-
-import static junit.framework.Assert.assertEquals;
-import static org.hamcrest.Matchers.hasItems;
-import static org.junit.Assert.assertThat;
-
-/**
- * Created by IntelliJ IDEA.
- * User: kallestenflo
- * Date: 11/4/11
- * Time: 10:44 PM
- */
-public class PathTokenizerTest {
-
-    private JsonProvider jsonProvider = JsonProvider.getInstance();
-
-    public final static String DOCUMENT =
-            "{ \"store\": {\n" +
-                    "    \"book\": [ \n" +
-                    "      { \"category\": \"reference\",\n" +
-                    "        \"author\": \"Nigel Rees\",\n" +
-                    "        \"title\": \"Sayings of the Century\",\n" +
-                    "        \"price\": 8.95\n" +
-                    "      },\n" +
-                    "      { \"category\": \"fiction\",\n" +
-                    "        \"author\": \"Evelyn Waugh\",\n" +
-                    "        \"title\": \"Sword of Honour\",\n" +
-                    "        \"price\": 12.99\n" +
-                    "      },\n" +
-                    "      { \"category\": \"fiction\",\n" +
-                    "        \"author\": \"Herman Melville\",\n" +
-                    "        \"title\": \"Moby Dick\",\n" +
-                    "        \"isbn\": \"0-553-21311-3\",\n" +
-                    "        \"price\": 8.99\n" +
-                    "      },\n" +
-                    "      { \"category\": \"fiction\",\n" +
-                    "        \"author\": \"J. R. R. Tolkien\",\n" +
-                    "        \"title\": \"The Lord of the Rings\",\n" +
-                    "        \"custom\": \"onely this\",\n" +
-                    "        \"isbn\": \"0-395-19395-8\",\n" +
-                    "        \"price\": 22.99\n" +
-                    "      }\n" +
-                    "    ],\n" +
-                    "    \"bicycle\": {\n" +
-                    "      \"color\": \"red\",\n" +
-                    "      \"price\": 19.95,\n" +
-                    "      \"foo:bar\": \"fooBar\",\n" +
-                    "      \"dot.notation\": \"new\"\n" +
-                    "    }\n" +
-                    "  }\n" +
-                    "}";
-
-    @Test
-    public void path_tokens_can_be_read() throws Exception {
-        Object result = jsonProvider.parse(DOCUMENT);
-
-        for (PathToken pathToken : new PathTokenizer("$.store.bicycle.color", jsonProvider)) {
-            result = pathToken.filter(result, jsonProvider);
-        }
-
-        assertEquals("red", result);
-    }
-
-    @Test
-    public void read_an_array_without_filters() throws Exception {
-        Object result = jsonProvider.parse(DOCUMENT);
-
-        for (PathToken pathToken : new PathTokenizer("$.store.book", jsonProvider)) {
-            result = pathToken.filter(result, jsonProvider);
-        }
-
-        assertEquals(4, toList(result).size());
-    }
-
-    @Test
-    public void read_a_literal_property_from_object_in_array() throws Exception {
-        Object result = jsonProvider.parse(DOCUMENT);
-
-        for (PathToken pathToken : new PathTokenizer("$.store.book[*].title", jsonProvider)) {
-            result = pathToken.filter(result, jsonProvider);
-        }
-
-        assertEquals(4, toList(result).size());
-    }
-
-    @Test
-    public void read_a_literal_property_from_position_in_array() throws Exception {
-        Object result = jsonProvider.parse(DOCUMENT);
-
-        for (PathToken pathToken : new PathTokenizer("$.store.book[0].title", jsonProvider)) {
-            result = pathToken.filter(result, jsonProvider);
-        }
-
-        assertEquals("Sayings of the Century", result);
-    }
-
-    @Test
-    public void read_a_literal_property_from_two_positions_in_array() throws Exception {
-        Object result = jsonProvider.parse(DOCUMENT);
-
-        for (PathToken pathToken : new PathTokenizer("$.store.book[0, 1].author", jsonProvider)) {
-            result = pathToken.filter(result, jsonProvider);
-        }
-
-        assertThat(this.<String>toList(result), hasItems("Nigel Rees", "Evelyn Waugh"));
-    }
-
-    @Test
-    public void read_a_literal_property_from_head_in_array() throws Exception {
-        Object result = jsonProvider.parse(DOCUMENT);
-
-        for (PathToken pathToken : new PathTokenizer("$.store.book[:2].author", jsonProvider)) {
-            result = pathToken.filter(result, jsonProvider);
-        }
-
-        assertThat(this.<String>toList(result), hasItems("Nigel Rees", "Evelyn Waugh"));
-    }
-
-    @Test
-    public void read_a_literal_property_from_tail_in_array() throws Exception {
-        Object result = jsonProvider.parse(DOCUMENT);
-
-        for (PathToken pathToken : new PathTokenizer("$.store.book[-1:].author", jsonProvider)) {
-            result = pathToken.filter(result, jsonProvider);
-        }
-        assertEquals("J. R. R. Tolkien", result);
-    }
-
-    @Test
-    public void field_defined_in_array_object() throws Exception {
-        Object result = jsonProvider.parse(DOCUMENT);
-
-        for (PathToken pathToken : new PathTokenizer("$.store.book[?(@.custom)].author", jsonProvider)) {
-            result = pathToken.filter(result, jsonProvider);
-        }
-        assertThat(this.<String>toList(result), hasItems("J. R. R. Tolkien"));
-    }
-
-    @Test
-    public void property_value_in_array_object() throws Exception {
-        Object result = jsonProvider.parse(DOCUMENT);
-
-        for (PathToken pathToken : new PathTokenizer("$.store.book[?(@.custom = 'onely this')].author", jsonProvider)) {
-            result = pathToken.filter(result, jsonProvider);
-        }
-        assertThat(this.<String>toList(result), hasItems("J. R. R. Tolkien"));
-    }
-
-    @Test
-    public void deep_scan() throws Exception {
-               Object result = jsonProvider.parse(DOCUMENT);
-
-        for (PathToken pathToken : new PathTokenizer("$..author", jsonProvider)) {
-            result = pathToken.filter(result, jsonProvider);
-        }
-        assertThat(this.<String>toList(result), hasItems("Nigel Rees","Evelyn Waugh", "J. R. R. Tolkien"));
-    }
-
-    private <T> List<T> toList(Object obj) {
-        return (List<T>) obj;
-    }
-
-}