/* * 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.google.common.collect; import com.google.common.annotations.GwtCompatible; import com.google.errorprone.annotations.CanIgnoreReturnValue; import java.util.concurrent.ConcurrentMap; import javax.annotation.CheckForNull; /** * 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
@ElementTypesAreNonnullByDefault
public abstract class ForwardingConcurrentMap