    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    }