1 /* 2 * Copyright (C) 2007 Google Inc. 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.google.common.collect; 18 19 import com.google.common.annotations.GwtCompatible; 20 21 import java.util.Map; 22 23 import javax.annotation.Nullable; 24 25 /** 26 * A map entry which forwards all its method calls to another map entry. 27 * Subclasses should override one or more methods to modify the behavior of the 28 * backing map entry as desired per the <a 29 * href="http://en.wikipedia.org/wiki/Decorator_pattern">decorator pattern</a>. 30 * 31 * @see ForwardingObject 32 * @author Mike Bostock 33 * @since 2010.01.04 <b>stable</b> (imported from Google Collections Library) 34 */ 35 @GwtCompatible 36 public abstract class ForwardingMapEntry<K, V> 37 extends ForwardingObject implements Map.Entry<K, V> { 38 39 @Override protected abstract Map.Entry<K, V> delegate(); 40 41 public K getKey() { 42 return delegate().getKey(); 43 } 44 45 public V getValue() { 46 return delegate().getValue(); 47 } 48 49 public V setValue(V value) { 50 return delegate().setValue(value); 51 } 52 53 @Override public boolean equals(@Nullable Object object) { 54 return delegate().equals(object); 55 } 56 57 @Override public int hashCode() { 58 return delegate().hashCode(); 59 } 60 } 61
