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 017package com.google.common.collect; 018 019import com.google.common.annotations.GwtCompatible; 020import com.google.errorprone.annotations.CanIgnoreReturnValue; 021import java.util.Map.Entry; 022import java.util.Set; 023import org.checkerframework.checker.nullness.qual.Nullable; 024 025/** 026 * A set multimap which forwards all its method calls to another set multimap. Subclasses should 027 * override one or more methods to modify the behavior of the backing multimap as desired per the <a 028 * href="http://en.wikipedia.org/wiki/Decorator_pattern">decorator pattern</a>. 029 * 030 * <p><b>{@code default} method warning:</b> This class does <i>not</i> forward calls to {@code 031 * default} methods. Instead, it inherits their default implementations. When those implementations 032 * invoke methods, they invoke methods on the {@code ForwardingSetMultimap}. 033 * 034 * @author Kurt Alfred Kluever 035 * @since 3.0 036 */ 037@GwtCompatible 038public abstract class ForwardingSetMultimap<K, V> extends ForwardingMultimap<K, V> 039 implements SetMultimap<K, V> { 040 041 @Override 042 protected abstract SetMultimap<K, V> delegate(); 043 044 @Override 045 public Set<Entry<K, V>> entries() { 046 return delegate().entries(); 047 } 048 049 @Override 050 public Set<V> get(@Nullable K key) { 051 return delegate().get(key); 052 } 053 054 @CanIgnoreReturnValue 055 @Override 056 public Set<V> removeAll(@Nullable Object key) { 057 return delegate().removeAll(key); 058 } 059 060 @CanIgnoreReturnValue 061 @Override 062 public Set<V> replaceValues(K key, Iterable<? extends V> values) { 063 return delegate().replaceValues(key, values); 064 } 065}