| /* |
| * 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(); |
| } |
| } |