/*
 * 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;

import static com.google.common.base.Preconditions.checkNotNull;

import com.google.common.annotations.GwtCompatible;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.Executor;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;

FluentFuture that forwards all calls to a delegate.

Extension

If you want a class like FluentFuture but with extra methods, we recommend declaring your own subclass of ListenableFuture, complete with a method like FluentFuture.from to adapt an existing ListenableFuture, implemented atop a ForwardingListenableFuture that forwards to that future and adds the desired methods.
/** * {@link FluentFuture} that forwards all calls to a delegate. * * <h3>Extension</h3> * * If you want a class like {@code FluentFuture} but with extra methods, we recommend declaring your * own subclass of {@link ListenableFuture}, complete with a method like {@link #from} to adapt an * existing {@code ListenableFuture}, implemented atop a {@link ForwardingListenableFuture} that * forwards to that future and adds the desired methods. */
@GwtCompatible final class ForwardingFluentFuture<V> extends FluentFuture<V> { private final ListenableFuture<V> delegate; ForwardingFluentFuture(ListenableFuture<V> delegate) { this.delegate = checkNotNull(delegate); } @Override public void addListener(Runnable listener, Executor executor) { delegate.addListener(listener, executor); } @Override public boolean cancel(boolean mayInterruptIfRunning) { return delegate.cancel(mayInterruptIfRunning); } @Override public boolean isCancelled() { return delegate.isCancelled(); } @Override public boolean isDone() { return delegate.isDone(); } @Override public V get() throws InterruptedException, ExecutionException { return delegate.get(); } @Override public V get(long timeout, TimeUnit unit) throws InterruptedException, ExecutionException, TimeoutException { return delegate.get(timeout, unit); } @Override public String toString() { return delegate.toString(); } }