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   /*
    * Copyright 2012 The Netty Project
    *
    * The Netty Project licenses this file to you 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 org.jboss.netty.channel;
  
  /**
   * The {@link CompleteChannelFuture} which is failed already.  It is
   * recommended to use {@link Channels#failedFuture(Channel, Throwable)}
   * instead of calling the constructor of this future.
   */
  public class FailedChannelFuture extends CompleteChannelFuture {
  
      private final Throwable cause;
  
      /**
       * Creates a new instance.
       *
       * @param channel the {@link Channel} associated with this future
       * @param cause   the cause of failure
       */
      public FailedChannelFuture(Channel channel, Throwable cause) {
          super(channel);
          if (cause == null) {
              throw new NullPointerException("cause");
          }
          this.cause = cause;
      }
  
      public Throwable getCause() {
          return cause;
      }
  
      public boolean isSuccess() {
          return false;
      }
  
      public ChannelFuture sync() throws InterruptedException {
          rethrow();
          return this;
      }
  
      public ChannelFuture syncUninterruptibly() {
          rethrow();
          return this;
      }
  
      private void rethrow() {
          if (cause instanceof RuntimeException) {
              throw (RuntimeException) cause;
          }
  
          if (cause instanceof Error) {
              throw (Error) cause;
          }
  
          throw new ChannelException(cause);
      }
  }