COLLECTIONS-228 - MultiValueMap put and putAll do not return the correct values

git-svn-id: https://svn.apache.org/repos/asf/jakarta/commons/proper/collections/trunk@468684 13f79535-47bb-0310-9956-ffa450edef68

RELEASE-NOTES.html

@@ -57,6 +57,7 @@ If this causes major headaches to anyone please contact commons-dev at jakarta.a
 <li>Flat3Map - Fix setValue in MapIterator and EntrySetIterator to work correctly [COLLECTIONS-217]</li>
 <li>ExtendedProperties - Include property name had confused static/instance semantics [COLLECTIONS-214]</li>
 <li>CollectionUtils - Fix removeAll() method which was completely broken [COLLECTIONS-219]</li>
+<li>MultiValueMap - Fix put() and putAll() to return correct results [COLLECTIONS-228]</li>
 </ul>
 
 <center><h3>JAVADOC</h3></center>

src/java/org/apache/commons/collections/map/MultiValueMap.java

@@ -205,12 +205,12 @@ public class MultiValueMap extends AbstractMapDecorator implements MultiMap {
         boolean result = false;
         Collection coll = getCollection(key);
         if (coll == null) {
-            coll = createCollection(1);
-            result = coll.add(value);
+            coll = createCollection(1);  // might produce a non-empty collection
+            coll.add(value);
             if (coll.size() > 0) {
                 // only add if non-zero size to maintain class state
                 getMap().put(key, coll);
-                result = false;
+                result = true;  // map definitely changed
             }
         } else {
             result = coll.add(value);
@@ -307,19 +307,20 @@ public class MultiValueMap extends AbstractMapDecorator implements MultiMap {
         if (values == null || values.size() == 0) {
             return false;
         }
+        boolean result = false;
         Collection coll = getCollection(key);
         if (coll == null) {
-            coll = createCollection(values.size());
-            boolean result = coll.addAll(values);
+            coll = createCollection(values.size());  // might produce a non-empty collection
+            coll.addAll(values);
             if (coll.size() > 0) {
                 // only add if non-zero size to maintain class state
                 getMap().put(key, coll);
-                result = false;
+                result = true;  // map definitely changed
             }
-            return result;
         } else {
-            return coll.addAll(values);
+            result = coll.addAll(values);
         }
+        return result;
     }
 
     /**

src/test/org/apache/commons/collections/map/TestMultiValueMap.java

@@ -30,7 +30,6 @@ import junit.framework.TestSuite;
 
 import org.apache.commons.collections.IteratorUtils;
 import org.apache.commons.collections.MultiMap;
-import org.apache.commons.collections.TestMultiHashMap;
 
 /**
  * TestMultiValueMap.
@@ -46,11 +45,11 @@ public class TestMultiValueMap extends TestCase {
     }
 
     public static Test suite() {
-        return new TestSuite(TestMultiHashMap.class);
+        return new TestSuite(TestMultiValueMap.class);
     }
 
     public static void main(String args[]) {
-        String[] testCaseName = { TestMultiHashMap.class.getName()};
+        String[] testCaseName = { TestMultiValueMap.class.getName()};
         junit.textui.TestRunner.main(testCaseName);
     }
 
@@ -201,9 +200,9 @@ public class TestMultiValueMap extends TestCase {
         map.put("B", "BC");
         assertEquals(2, map.size());
         map.remove("A");
-        assertEquals(2, map.size());
+        assertEquals(1, map.size());
         map.remove("B", "BC");
-        assertEquals(2, map.size());
+        assertEquals(1, map.size());
     }
     
     public void testSize_Key() {
@@ -249,6 +248,25 @@ public class TestMultiValueMap extends TestCase {
         assertEquals(false, map.containsValue("A", "AB"));
     }
 
+    public void testPutWithList() {
+        MultiValueMap test = MultiValueMap.decorate(new HashMap(), ArrayList.class);
+        assertEquals("a", test.put("A", "a"));
+        assertEquals("b", test.put("A", "b"));
+        assertEquals(1, test.size());
+        assertEquals(2, test.size("A"));
+        assertEquals(2, test.totalSize());
+    }
+
+    public void testPutWithSet() {
+        MultiValueMap test = MultiValueMap.decorate(new HashMap(), HashSet.class);
+        assertEquals("a", test.put("A", "a"));
+        assertEquals("b", test.put("A", "b"));
+        assertEquals(null, test.put("A", "a"));
+        assertEquals(1, test.size());
+        assertEquals(2, test.size("A"));
+        assertEquals(2, test.totalSize());
+    }
+
     public void testPutAll_Map1() {
         MultiMap original = new MultiValueMap();
         original.put("key", "object1");