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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.collect.ForwardingQueue;
import java.util.Collection;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.TimeUnit;
/**
* 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 <a
* href="http://en.wikipedia.org/wiki/Decorator_pattern">decorator pattern</a>.
*
* @author Raimundo Mirisola
*
* @param <E> the type of elements held in this collection
* @since 4.0
*/
public abstract class ForwardingBlockingQueue<E> extends ForwardingQueue<E>
implements BlockingQueue<E> {
/** Constructor for use by subclasses. */
protected ForwardingBlockingQueue() {}
@Override protected abstract BlockingQueue<E> delegate();
@Override public int drainTo(
Collection<? super E> c, int maxElements) {
return delegate().drainTo(c, maxElements);
}
@Override public int drainTo(Collection<? super E> c) {
return delegate().drainTo(c);
}
@Override public boolean offer(E e, long timeout, TimeUnit unit)
throws InterruptedException {
return delegate().offer(e, timeout, unit);
}
@Override 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();
}
@Override public E take() throws InterruptedException {
return delegate().take();
}
}
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