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.Collection; 22 import java.util.Map; 23 import java.util.Set; 24 25 import javax.annotation.Nullable; 26 27 /** 28 * A map which forwards all its method calls to another map. Subclasses should 29 * override one or more methods to modify the behavior of the backing map as 30 * desired per the <a 31 * href="http://en.wikipedia.org/wiki/Decorator_pattern">decorator pattern</a>. 32 * 33 * @see ForwardingObject 34 * @author Kevin Bourrillion 35 * @author Jared Levy 36 * @since 2010.01.04 <b>stable</b> (imported from Google Collections Library) 37 */ 38 @GwtCompatible 39 public abstract class ForwardingMap<K, V> extends ForwardingObject 40 implements Map<K, V> { 41 delegate()42 @Override protected abstract Map<K, V> delegate(); 43 size()44 public int size() { 45 return delegate().size(); 46 } 47 isEmpty()48 public boolean isEmpty() { 49 return delegate().isEmpty(); 50 } 51 remove(Object object)52 public V remove(Object object) { 53 return delegate().remove(object); 54 } 55 clear()56 public void clear() { 57 delegate().clear(); 58 } 59 containsKey(Object key)60 public boolean containsKey(Object key) { 61 return delegate().containsKey(key); 62 } 63 containsValue(Object value)64 public boolean containsValue(Object value) { 65 return delegate().containsValue(value); 66 } 67 get(Object key)68 public V get(Object key) { 69 return delegate().get(key); 70 } 71 put(K key, V value)72 public V put(K key, V value) { 73 return delegate().put(key, value); 74 } 75 putAll(Map<? extends K, ? extends V> map)76 public void putAll(Map<? extends K, ? extends V> map) { 77 delegate().putAll(map); 78 } 79 keySet()80 public Set<K> keySet() { 81 return delegate().keySet(); 82 } 83 values()84 public Collection<V> values() { 85 return delegate().values(); 86 } 87 entrySet()88 public Set<Entry<K, V>> entrySet() { 89 return delegate().entrySet(); 90 } 91 equals(@ullable Object object)92 @Override public boolean equals(@Nullable Object object) { 93 return object == this || delegate().equals(object); 94 } 95 hashCode()96 @Override public int hashCode() { 97 return delegate().hashCode(); 98 } 99 } 100