| /** |
| * Copyright (c) 2003-2004, Joe Walnes |
| * 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 XStream 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.apache.xmlbeans.impl.common; |
| |
| import java.util.Collection; |
| import java.util.HashMap; |
| import java.util.Iterator; |
| import java.util.Map; |
| import java.util.Set; |
| |
| /** |
| * Behaves the same way as JDK1.4 java.util.IdentityHashMap, but in JDK1.3 as well. |
| * <p/> |
| * Modified version of ObjectIdDictionary from XStream. |
| */ |
| public class IdentityMap implements Map |
| { |
| private transient Map map; |
| |
| private static class KeyWrapper |
| { |
| private final Object obj; |
| |
| public KeyWrapper(Object obj) |
| { |
| this.obj = obj; |
| } |
| |
| public int hashCode() |
| { |
| return System.identityHashCode(obj); |
| } |
| |
| public boolean equals(Object other) |
| { |
| return obj == ((KeyWrapper)other).obj; |
| } |
| |
| public String toString() |
| { |
| return obj.toString(); |
| } |
| } |
| |
| public IdentityMap() |
| { |
| map = new HashMap(); |
| } |
| |
| public int size() |
| { |
| return map.size(); |
| } |
| |
| public boolean isEmpty() |
| { |
| return map.isEmpty(); |
| } |
| |
| public boolean containsKey(Object key) |
| { |
| return map.containsKey(new KeyWrapper(key)); |
| } |
| |
| public boolean containsValue(Object value) |
| { |
| return map.containsValue(value); |
| } |
| |
| public Object get(Object key) |
| { |
| return map.get(new KeyWrapper(key)); |
| } |
| |
| public Object put(Object key, Object value) |
| { |
| return map.put(new KeyWrapper(key), value); |
| } |
| |
| public Object remove(Object key) |
| { |
| return map.remove(new KeyWrapper(key)); |
| } |
| |
| public void putAll(Map t) |
| { |
| throw new UnsupportedOperationException("unimplemented"); |
| } |
| |
| public void clear() |
| { |
| map.clear(); |
| } |
| |
| public int hashCode() |
| { |
| return map.hashCode(); |
| } |
| |
| public Set keySet() |
| { |
| return map.keySet(); |
| } |
| |
| public Collection values() |
| { |
| return map.values(); |
| } |
| |
| public Set entrySet() |
| { |
| return map.entrySet(); |
| } |
| |
| public Iterator iterator() |
| { |
| return map.keySet().iterator(); |
| } |
| |
| public boolean equals(Object o) |
| { |
| throw new RuntimeException("unimplemented"); |
| } |
| |
| } |