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001 /*
002 * Copyright (C) 2007 The Guava Authors
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 * http://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 */
016
017 package com.google.common.collect;
018
019 import com.google.common.annotations.GwtCompatible;
020
021 import java.util.Collection;
022 import java.util.Map;
023 import java.util.Map.Entry;
024 import java.util.Set;
025
026 import javax.annotation.Nullable;
027
028 /**
029 * A multimap which forwards all its method calls to another multimap.
030 * Subclasses should override one or more methods to modify the behavior of
031 * the backing multimap as desired per the <a
032 * href="http://en.wikipedia.org/wiki/Decorator_pattern">decorator pattern</a>.
033 *
034 * @author Robert Konigsberg
035 * @since 2.0 (imported from Google Collections Library)
036 */
037 @GwtCompatible
038 public abstract class ForwardingMultimap<K, V> extends ForwardingObject
039 implements Multimap<K, V> {
040
041 /** Constructor for use by subclasses. */
042 protected ForwardingMultimap() {}
043
044 @Override protected abstract Multimap<K, V> delegate();
045
046 @Override
047 public Map<K, Collection<V>> asMap() {
048 return delegate().asMap();
049 }
050
051 @Override
052 public void clear() {
053 delegate().clear();
054 }
055
056 @Override
057 public boolean containsEntry(@Nullable Object key, @Nullable Object value) {
058 return delegate().containsEntry(key, value);
059 }
060
061 @Override
062 public boolean containsKey(@Nullable Object key) {
063 return delegate().containsKey(key);
064 }
065
066 @Override
067 public boolean containsValue(@Nullable Object value) {
068 return delegate().containsValue(value);
069 }
070
071 @Override
072 public Collection<Entry<K, V>> entries() {
073 return delegate().entries();
074 }
075
076 @Override
077 public Collection<V> get(@Nullable K key) {
078 return delegate().get(key);
079 }
080
081 @Override
082 public boolean isEmpty() {
083 return delegate().isEmpty();
084 }
085
086 @Override
087 public Multiset<K> keys() {
088 return delegate().keys();
089 }
090
091 @Override
092 public Set<K> keySet() {
093 return delegate().keySet();
094 }
095
096 @Override
097 public boolean put(K key, V value) {
098 return delegate().put(key, value);
099 }
100
101 @Override
102 public boolean putAll(K key, Iterable<? extends V> values) {
103 return delegate().putAll(key, values);
104 }
105
106 @Override
107 public boolean putAll(Multimap<? extends K, ? extends V> multimap) {
108 return delegate().putAll(multimap);
109 }
110
111 @Override
112 public boolean remove(@Nullable Object key, @Nullable Object value) {
113 return delegate().remove(key, value);
114 }
115
116 @Override
117 public Collection<V> removeAll(@Nullable Object key) {
118 return delegate().removeAll(key);
119 }
120
121 @Override
122 public Collection<V> replaceValues(K key, Iterable<? extends V> values) {
123 return delegate().replaceValues(key, values);
124 }
125
126 @Override
127 public int size() {
128 return delegate().size();
129 }
130
131 @Override
132 public Collection<V> values() {
133 return delegate().values();
134 }
135
136 @Override public boolean equals(@Nullable Object object) {
137 return object == this || delegate().equals(object);
138 }
139
140 @Override public int hashCode() {
141 return delegate().hashCode();
142 }
143 }
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