    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.Map.Entry;
    022    import java.util.Set;
    023
    024    import javax.annotation.Nullable;
    025
    026    /**
    027     * A set multimap which forwards all its method calls to another set multimap.
    028     * Subclasses should override one or more methods to modify the behavior of
    029     * the backing multimap as desired per the <a
    030     * href="http://en.wikipedia.org/wiki/Decorator_pattern">decorator pattern</a>.
    031     *
    032     * @author Kurt Alfred Kluever
    033     * @since 3.0
    034     */
    035    @GwtCompatible
    036    public abstract class ForwardingSetMultimap<K, V>
    037        extends ForwardingMultimap<K, V> implements SetMultimap<K, V> {
    038
    039      @Override protected abstract SetMultimap<K, V> delegate();
    040
    041      @Override public Set<Entry<K, V>> entries() {
    042        return delegate().entries();
    043      }
    044
    045      @Override public Set<V> get(@Nullable K key) {
    046        return delegate().get(key);
    047      }
    048
    049      @Override public Set<V> removeAll(@Nullable Object key) {
    050        return delegate().removeAll(key);
    051      }
    052
    053      @Override public Set<V> replaceValues(K key, Iterable<? extends V> values) {
    054        return delegate().replaceValues(key, values);
    055      }
    056    }