Map implementation that matches keys and values based
+ * on == not equals().
+ *
+ * This map will violate the detail of various Map and map view contracts.
+ * As a general rule, don't compare this map to other maps.
+ *
+ * @since Commons Collections 3.0
+ * @version $Revision: 1.1 $ $Date: 2003/12/02 21:57:08 $
+ *
+ * @author java util HashMap
+ * @author Stephen Colebourne
+ */
+public class IdentityMap extends HashedMap {
+
+ /** Serialisation version */
+
+ /**
+ * Constructs a new empty map with default size and load factor.
+ */
+ public IdentityMap() {
+ super();
+ }
+
+ /**
+ * Constructs a new, empty map with the specified initial capacity.
+ *
+ * @param initialCapacity the initial capacity
+ * @throws IllegalArgumentException if the initial capacity is less than one
+ */
+ public IdentityMap(int initialCapacity) {
+ super(initialCapacity);
+ }
+
+ /**
+ * Constructs a new, empty map with the specified initial capacity and
+ * load factor.
+ *
+ * @param initialCapacity the initial capacity
+ * @param loadFactor the load factor
+ * @throws IllegalArgumentException if the initial capacity is less than one
+ * @throws IllegalArgumentException if the load factor is less than one
+ */
+ public IdentityMap(int initialCapacity, float loadFactor) {
+ super(initialCapacity, loadFactor);
+ }
+
+ /**
+ * Constructor copying elements from another map.
+ *
+ * @param map the map to copy
+ * @throws NullPointerException if the map is null
+ */
+ public IdentityMap(Map map) {
+ super(map);
+ }
+
+ //-----------------------------------------------------------------------
+ /**
+ * Gets the hash code for the key specified.
+ * This implementation uses the identity hash code.
+ *
+ * @param key the key to get a hash code for
+ * @return the hash code
+ */
+ protected int hash(Object key) {
+ return System.identityHashCode(key);
+ }
+
+ /**
+ * Compares two keys for equals.
+ * This implementation uses ==.
+ *
+ * @param key1 the first key to compare
+ * @param key2 the second key to compare
+ * @return true if equal by identity
+ */
+ protected boolean isEqualKey(Object key1, Object key2) {
+ return (key1 == key2);
+ }
+
+ /**
+ * Compares two values for equals.
+ * This implementation uses ==.
+ *
+ * @param value1 the first value to compare
+ * @param value2 the second value to compare
+ * @return true if equal by identity
+ */
+ protected boolean isEqualValue(Object value1, Object value2) {
+ return (value1 == value2);
+ }
+
+ /**
+ * Creates an entry to store the data.
+ * This implementation creates an IdentityEntry instance.
+ *
+ * @param next the next entry in sequence
+ * @param hashCode the hash code to use
+ * @param key the key to store
+ * @param value the value to store
+ * @return the newly created entry
+ */
+ protected HashEntry createEntry(HashEntry next, int hashCode, Object key, Object value) {
+ return new IdentityEntry(next, hashCode, key, value);
+ }
+
+ //-----------------------------------------------------------------------
+ /**
+ * HashEntry
+ */
+ protected static class IdentityEntry extends HashEntry {
+
+ protected IdentityEntry(HashEntry next, int hashCode, Object key, Object value) {
+ super(next, hashCode, key, value);
+ }
+
+ public boolean equals(Object obj) {
+ if (obj == this) {
+ return true;
+ }
+ if (obj instanceof Map.Entry == false) {
+ return false;
+ }
+ Map.Entry other = (Map.Entry) obj;
+ return
+ (getKey() == other.getKey()) &&
+ (getValue() == other.getValue());
+ }
+
+ public int hashCode() {
+ return System.identityHashCode(getKey()) ^
+ System.identityHashCode(getValue());
+ }
+ }
+
+}
diff --git a/src/test/org/apache/commons/collections/map/TestAll.java b/src/test/org/apache/commons/collections/map/TestAll.java
index 8f452144d..1d83cac5d 100644
--- a/src/test/org/apache/commons/collections/map/TestAll.java
+++ b/src/test/org/apache/commons/collections/map/TestAll.java
@@ -1,5 +1,5 @@
/*
- * $Header: /home/jerenkrantz/tmp/commons/commons-convert/cvs/home/cvs/jakarta-commons//collections/src/test/org/apache/commons/collections/map/TestAll.java,v 1.5 2003/12/02 00:44:13 scolebourne Exp $
+ * $Header: /home/jerenkrantz/tmp/commons/commons-convert/cvs/home/cvs/jakarta-commons//collections/src/test/org/apache/commons/collections/map/TestAll.java,v 1.6 2003/12/02 21:57:08 scolebourne Exp $
* ====================================================================
*
* The Apache Software License, Version 1.1
@@ -65,7 +65,7 @@ import junit.framework.TestSuite;
* Entry point for tests.
*
* @since Commons Collections 3.0
- * @version $Revision: 1.5 $ $Date: 2003/12/02 00:44:13 $
+ * @version $Revision: 1.6 $ $Date: 2003/12/02 21:57:08 $
*
* @author Stephen Colebourne
*/
@@ -86,8 +86,8 @@ public class TestAll extends TestCase {
suite.addTest(TestFixedSizeMap.suite());
suite.addTest(TestFixedSizeSortedMap.suite());
suite.addTest(TestFlat3Map.suite());
-// suite.addTest(TestHashedMap.suite());
-// suite.addTest(TestIdentityMap.suite());
+ suite.addTest(TestHashedMap.suite());
+ suite.addTest(TestIdentityMap.suite());
suite.addTest(TestLazyMap.suite());
suite.addTest(TestLazySortedMap.suite());
suite.addTest(TestListOrderedMap.suite());
diff --git a/src/test/org/apache/commons/collections/map/TestIdentityMap.java b/src/test/org/apache/commons/collections/map/TestIdentityMap.java
new file mode 100644
index 000000000..51c362cf5
--- /dev/null
+++ b/src/test/org/apache/commons/collections/map/TestIdentityMap.java
@@ -0,0 +1,155 @@
+/*
+ * $Header: /home/jerenkrantz/tmp/commons/commons-convert/cvs/home/cvs/jakarta-commons//collections/src/test/org/apache/commons/collections/map/TestIdentityMap.java,v 1.1 2003/12/02 21:57:08 scolebourne Exp $
+ * ====================================================================
+ *
+ * The Apache Software License, Version 1.1
+ *
+ * Copyright (c) 2001-2003 The Apache Software Foundation. All rights
+ * reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *
+ * 2. 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.
+ *
+ * 3. The end-user documentation included with the redistribution, if
+ * any, must include the following acknowledgement:
+ * "This product includes software developed by the
+ * Apache Software Foundation (http://www.apache.org/)."
+ * Alternately, this acknowledgement may appear in the software itself,
+ * if and wherever such third-party acknowledgements normally appear.
+ *
+ * 4. The names "The Jakarta Project", "Commons", and "Apache Software
+ * Foundation" must not be used to endorse or promote products derived
+ * from this software without prior written permission. For written
+ * permission, please contact apache@apache.org.
+ *
+ * 5. Products derived from this software may not be called "Apache"
+ * nor may "Apache" appear in their names without prior written
+ * permission of the Apache Software Foundation.
+ *
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED 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 APACHE SOFTWARE FOUNDATION OR
+ * ITS 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.
+ * ====================================================================
+ *
+ * This software consists of voluntary contributions made by many
+ * individuals on behalf of the Apache Software Foundation. For more
+ * information on the Apache Software Foundation, please see
+ *