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
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    }