/*
 * Copyright 2012 LinkedIn, Inc
 *
 * 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.linkedin.parseq.promise;

import java.util.concurrent.TimeUnit;


/**
 * An abstract class that makes it easy to delegate {@link Promise} method
 * invocations to a delegate promise.
 *
 * @author Chris Pettitt (cpettitt@linkedin.com)
 */
public class DelegatingPromise<T> implements Promise<T> {
  private final Promise<T> _delegate;

  public DelegatingPromise(final Promise<T> delegate) {
    _delegate = delegate;
  }

  @Override
  public T get() throws PromiseException {
    return _delegate.get();
  }

  @Override
  public Throwable getError() {
    return _delegate.getError();
  }

  public T getOrDefault(final T defaultValue) {
    return _delegate.getOrDefault(defaultValue);
  }

  @Override
  public void await() throws InterruptedException {
    _delegate.await();
  }

  @Override
  public boolean await(final long time, final TimeUnit unit) throws InterruptedException {
    return _delegate.await(time, unit);
  }

  @Override
  public void addListener(final PromiseListener<T> listener) {
    _delegate.addListener(listener);
  }

  @Override
  public boolean isDone() {
    return _delegate.isDone();
  }

  @Override
  public boolean isFailed() {
    return _delegate.isFailed();
  }

  protected Promise<T> getDelegate() {
    return _delegate;
  }
}