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 /*
  * Copyright (C) 2009 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;
A java.util.concurrent.Future which forwards all its method calls to another future. Subclasses should override one or more methods to modify the behavior of the backing future as desired per the decorator pattern.

Most subclasses can just use ForwardingFuture.SimpleForwardingFuture.

Author(s):
Sven Mawson
Since:
1.0
public abstract class ForwardingFuture<V> extends ForwardingObject
    implements Future<V> {

  
Constructor for use by subclasses.
  protected ForwardingFuture() {}
  @Override protected abstract Future<V> delegate();
  public boolean cancel(boolean mayInterruptIfRunning) {
    return delegate().cancel(mayInterruptIfRunning);
  }
  public boolean isCancelled() {
    return delegate().isCancelled();
  }
  public boolean isDone() {
    return delegate().isDone();
  }
  public V get() throws InterruptedExceptionExecutionException {
    return delegate().get();
  }
  public V get(long timeoutTimeUnit unit)
    return delegate().get(timeoutunit);
  }
  /*
   * TODO(cpovirk): Use standard Javadoc form for SimpleForwarding* class and
   * constructor
   */
  
A simplified version of ForwardingFuture where subclasses can pass in an already constructed java.util.concurrent.Future as the delegate.

Since:
9.0
  public abstract static class SimpleForwardingFuture<V> 
      extends ForwardingFuture<V> {
    private final Future<V> delegate;
    protected SimpleForwardingFuture(Future<V> delegate) {
      this. = Preconditions.checkNotNull(delegate);
    }
    @Override
    protected final Future<V> delegate() {
      return ;
    }
    
  }
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