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/*
 * Copyright (C) 2007 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.facebook.presto.jdbc.internal.guava.collect;

import com.facebook.presto.jdbc.internal.guava.annotations.GwtCompatible;
import com.google.errorprone.annotations.CanIgnoreReturnValue;
import java.util.concurrent.ConcurrentMap;

/**
 * A concurrent map which forwards all its method calls to another concurrent map. Subclasses should
 * override one or more methods to modify the behavior of the backing map as desired per the decorator pattern.
 *
 * 

{@code default} method warning: This class forwards calls to only some {@code * default} methods. Specifically, it forwards calls only for methods that existed before * {@code default} methods were introduced. For newer methods, like {@code forEach}, it inherits * their default implementations. When those implementations invoke methods, they invoke methods on * the {@code ForwardingConcurrentMap}. * * @author Charles Fry * @since 2.0 */ @GwtCompatible public abstract class ForwardingConcurrentMap extends ForwardingMap implements ConcurrentMap { /** Constructor for use by subclasses. */ protected ForwardingConcurrentMap() {} @Override protected abstract ConcurrentMap delegate(); @CanIgnoreReturnValue @Override public V putIfAbsent(K key, V value) { return delegate().putIfAbsent(key, value); } @CanIgnoreReturnValue @Override public boolean remove(Object key, Object value) { return delegate().remove(key, value); } @CanIgnoreReturnValue @Override public V replace(K key, V value) { return delegate().replace(key, value); } @CanIgnoreReturnValue @Override public boolean replace(K key, V oldValue, V newValue) { return delegate().replace(key, oldValue, newValue); } }





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