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/*
 * Copyright (C) 2011 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.annotations.Beta;
import com.google.common.base.Preconditions;

import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;

/**
 * A 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 simply extend {@link SimpleForwardingCheckedFuture}. * * @param The result type returned by this Future's {@code get} method * @param The type of the Exception thrown by the Future's * {@code checkedGet} method * * @author Anthony Zana * @since 9.0 */ @Beta public abstract class ForwardingCheckedFuture extends ForwardingListenableFuture implements CheckedFuture { @Override public V checkedGet() throws X { return delegate().checkedGet(); } @Override public V checkedGet(long timeout, TimeUnit unit) throws TimeoutException, X { return delegate().checkedGet(timeout, unit); } @Override protected abstract CheckedFuture delegate(); // TODO(cpovirk): Use Standard Javadoc form for SimpleForwarding* /** * A simplified version of {@link ForwardingCheckedFuture} where subclasses * can pass in an already constructed {@link CheckedFuture} as the delegate. * * @since 9.0 */ @Beta public abstract static class SimpleForwardingCheckedFuture< V, X extends Exception> extends ForwardingCheckedFuture { private final CheckedFuture delegate; protected SimpleForwardingCheckedFuture(CheckedFuture delegate) { this.delegate = Preconditions.checkNotNull(delegate); } @Override protected final CheckedFuture delegate() { return delegate; } } }





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