guava/src/com/google/common/collect/ForwardingQueue.java

/*
 * 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 java.util.NoSuchElementException;
import java.util.Queue;

/**
 * A queue which forwards all its method calls to another queue. Subclasses
 * should override one or more methods to modify the behavior of the backing
 * queue as desired per the <a
 * href="http://en.wikipedia.org/wiki/Decorator_pattern">decorator pattern</a>.
 *
 * <p><b>Warning:</b> The methods of {@code ForwardingQueue} forward
 * <b>indiscriminately</b> to the methods of the delegate. For example,
 * overriding {@link #add} alone <b>will not</b> change the behavior of {@link
 * #offer} which can lead to unexpected behavior. In this case, you should
 * override {@code offer} as well, either providing your own implementation, or
 * delegating to the provided {@code standardOffer} method.
 *
 * <p>The {@code standard} methods are not guaranteed to be thread-safe, even
 * when all of the methods that they depend on are thread-safe.
 *
 * @author Mike Bostock
 * @author Louis Wasserman
 * @since 2.0 (imported from Google Collections Library)
 */
@GwtCompatible
public abstract class ForwardingQueue<E> extends ForwardingCollection<E>
    implements Queue<E> {

  /** Constructor for use by subclasses. */
  protected ForwardingQueue() {}

  @Override protected abstract Queue<E> delegate();

  @Override
  public boolean offer(E o) {
    return delegate().offer(o);
  }

  @Override
  public E poll() {
    return delegate().poll();
  }

  @Override
  public E remove() {
    return delegate().remove();
  }

  @Override
  public E peek() {
    return delegate().peek();
  }

  @Override
  public E element() {
    return delegate().element();
  }

  /**
   * A sensible definition of {@link #offer} in terms of {@link #add}. If you
   * override {@link #add}, you may wish to override {@link #offer} to forward
   * to this implementation.
   * 
   * @since 7.0
   */
  protected boolean standardOffer(E e) {
    try {
      return add(e);
    } catch (IllegalStateException caught) {
      return false;
    }
  }

  /**
   * A sensible definition of {@link #peek} in terms of {@link #element}. If you
   * override {@link #element}, you may wish to override {@link #peek} to
   * forward to this implementation.
   * 
   * @since 7.0
   */
  protected E standardPeek() {
    try {
      return element();
    } catch (NoSuchElementException caught) {
      return null;
    }
  }

  /**
   * A sensible definition of {@link #poll} in terms of {@link #remove}. If you
   * override {@link #remove}, you may wish to override {@link #poll} to forward
   * to this implementation.
   * 
   * @since 7.0
   */
  protected E standardPoll() {
    try {
      return remove();
    } catch (NoSuchElementException caught) {
      return null;
    }
  }
}