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/*
 * 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.util.concurrent;

import com.google.common.annotations.GwtIncompatible;
import com.google.common.annotations.J2ktIncompatible;
import com.google.common.collect.ForwardingQueue;
import com.google.errorprone.annotations.CanIgnoreReturnValue;
import java.util.Collection;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.TimeUnit;
import javax.annotation.CheckForNull;

/**
 * A {@link BlockingQueue} which forwards all its method calls to another {@link BlockingQueue}.
 * Subclasses should override one or more methods to modify the behavior of the backing collection
 * as desired per the decorator
 * pattern.
 *
 * 

{@code default} method warning: This class does not forward calls to {@code * default} methods. Instead, it inherits their default implementations. When those implementations * invoke methods, they invoke methods on the {@code ForwardingBlockingQueue}. * * @author Raimundo Mirisola * @param the type of elements held in this collection * @since 4.0 */ @J2ktIncompatible @GwtIncompatible @ElementTypesAreNonnullByDefault public abstract class ForwardingBlockingQueue extends ForwardingQueue implements BlockingQueue { /** Constructor for use by subclasses. */ protected ForwardingBlockingQueue() {} @Override protected abstract BlockingQueue delegate(); @CanIgnoreReturnValue @Override public int drainTo(Collection c, int maxElements) { return delegate().drainTo(c, maxElements); } @CanIgnoreReturnValue @Override public int drainTo(Collection c) { return delegate().drainTo(c); } @CanIgnoreReturnValue // TODO(kak): consider removing this @Override public boolean offer(E e, long timeout, TimeUnit unit) throws InterruptedException { return delegate().offer(e, timeout, unit); } @CanIgnoreReturnValue // TODO(kak): consider removing this @Override @CheckForNull public E poll(long timeout, TimeUnit unit) throws InterruptedException { return delegate().poll(timeout, unit); } @Override public void put(E e) throws InterruptedException { delegate().put(e); } @Override public int remainingCapacity() { return delegate().remainingCapacity(); } @CanIgnoreReturnValue // TODO(kak): consider removing this @Override public E take() throws InterruptedException { return delegate().take(); } }





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