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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.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 <a href="http://en.wikipedia.org/wiki/Decorator_pattern">decorator
* pattern</a>.
*
* <p><b>{@code default} method warning:</b> This class does <i>not</i> 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 <E> the type of elements held in this collection
* @since 4.0
*/
@CanIgnoreReturnValue // TODO(cpovirk): Consider being more strict.
@GwtIncompatible
@ElementTypesAreNonnullByDefault
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
@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();
}
@Override
public E take() throws InterruptedException {
return delegate().take();
}
}
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