/*
 * Copyright (C) 2010 The Guava Authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.google.common.collect;

import java.util.Map.Entry;
import java.util.Set;

import javax.annotation.Nullable;

import com.google.common.annotations.GwtCompatible;

/**
 * A set multimap which forwards all its method calls to another set multimap.
 * Subclasses should override one or more methods to modify the behavior of the
 * backing multimap as desired per the
 * <a href="http://en.wikipedia.org/wiki/Decorator_pattern">decorator
 * pattern</a>.
 *
 * @author Kurt Alfred Kluever
 * @since 3.0
 */
@GwtCompatible
public abstract class ForwardingSetMultimap<K, V> extends ForwardingMultimap<K, V> implements SetMultimap<K, V> {

	@Override
	protected abstract SetMultimap<K, V> delegate();

	@Override
	public Set<Entry<K, V>> entries() {
		return delegate().entries();
	}

	@Override
	public Set<V> get(@Nullable K key) {
		return delegate().get(key);
	}

	@Override
	public Set<V> removeAll(@Nullable Object key) {
		return delegate().removeAll(key);
	}

	@Override
	public Set<V> replaceValues(K key, Iterable<? extends V> values) {
		return delegate().replaceValues(key, values);
	}
}