| /* |
| * Copyright 2011 Google Inc. |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); you may not |
| * use this file except in compliance with the License. You may obtain a copy of |
| * the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT |
| * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the |
| * License for the specific language governing permissions and limitations under |
| * the License. |
| */ |
| package java.util; |
| |
| import java.io.Serializable; |
| |
| /** |
| * Map using reference equality on keys. <a |
| * href="http://java.sun.com/j2se/1.5.0/docs/api/java/util/IdentityHashMap.html">[Sun |
| * docs]</a> |
| * |
| * @param <K> key type |
| * @param <V> value type |
| */ |
| public class IdentityHashMap<K, V> extends AbstractHashMap<K, V> implements |
| Map<K, V>, Cloneable, Serializable { |
| |
| /** |
| * Ensures that RPC will consider type parameter K to be exposed. It will be |
| * pruned by dead code elimination. |
| */ |
| @SuppressWarnings("unused") |
| private K exposeKey; |
| |
| /** |
| * Ensures that RPC will consider type parameter V to be exposed. It will be |
| * pruned by dead code elimination. |
| */ |
| @SuppressWarnings("unused") |
| private V exposeValue; |
| |
| public IdentityHashMap() { |
| } |
| |
| public IdentityHashMap(int ignored) { |
| super(ignored); |
| } |
| |
| public IdentityHashMap(Map<? extends K, ? extends V> toBeCopied) { |
| super(toBeCopied); |
| } |
| |
| public Object clone() { |
| return new IdentityHashMap<K, V>(this); |
| } |
| |
| @Override |
| public boolean equals(Object obj) { |
| if (obj == this) { |
| return true; |
| } |
| if (!(obj instanceof Map)) { |
| return false; |
| } |
| Map<?, ?> otherMap = (Map<?, ?>) obj; |
| if (size() != otherMap.size()) { |
| return false; |
| } |
| |
| for (Entry<?, ?> entry : otherMap.entrySet()) { |
| Object otherKey = entry.getKey(); |
| Object otherValue = entry.getValue(); |
| if (!containsKey(otherKey)) { |
| return false; |
| } |
| if (otherValue != get(otherKey)) { |
| return false; |
| } |
| } |
| return true; |
| } |
| |
| @Override |
| public int hashCode() { |
| int hashCode = 0; |
| for (Entry<K, V> entry : entrySet()) { |
| hashCode += System.identityHashCode(entry.getKey()); |
| hashCode += System.identityHashCode(entry.getValue()); |
| } |
| return hashCode; |
| } |
| |
| @Override |
| boolean equals(Object value1, Object value2) { |
| return value1 == value2; |
| } |
| |
| @Override |
| int getHashCode(Object key) { |
| return System.identityHashCode(key); |
| } |
| } |