001 /*
002 * Copyright (C) 2010 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.List;
022
023 import javax.annotation.Nullable;
024
025 /**
026 * A list multimap which forwards all its method calls to another list multimap.
027 * Subclasses should override one or more methods to modify the behavior of
028 * the backing multimap as desired per the <a
029 * href="http://en.wikipedia.org/wiki/Decorator_pattern">decorator pattern</a>.
030 *
031 * @author Kurt Alfred Kluever
032 * @since 3.0
033 */
034 @GwtCompatible
035 public abstract class ForwardingListMultimap<K, V>
036 extends ForwardingMultimap<K, V> implements ListMultimap<K, V> {
037
038 /** Constructor for use by subclasses. */
039 protected ForwardingListMultimap() {}
040
041 @Override protected abstract ListMultimap<K, V> delegate();
042
043 @Override public List<V> get(@Nullable K key) {
044 return delegate().get(key);
045 }
046
047 @Override public List<V> removeAll(@Nullable Object key) {
048 return delegate().removeAll(key);
049 }
050
051 @Override public List<V> replaceValues(K key, Iterable<? extends V> values) {
052 return delegate().replaceValues(key, values);
053 }
054 }