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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;
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;
/**
* {@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);
}
}
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