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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:
    *
    *   https://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 io.netty.channel;
  
  import io.netty.util.concurrent.EventExecutor;
  import io.netty.util.internal.ObjectUtil;
  import io.netty.util.internal.PlatformDependent;
  
  /**
   * The {@link CompleteChannelFuture} which is failed already.  It is
   * recommended to use {@link Channel#newFailedFuture(Throwable)}
   * instead of calling the constructor of this future.
   */
  final 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
       */
      FailedChannelFuture(Channel channel, EventExecutor executor, Throwable cause) {
          super(channel, executor);
          this.cause = ObjectUtil.checkNotNull(cause, "cause");
      }
  
      @Override
      public Throwable cause() {
          return cause;
      }
  
      @Override
      public boolean isSuccess() {
          return false;
      }
  
      @Override
      public ChannelFuture sync() {
          PlatformDependent.throwException(cause);
          return this;
      }
  
      @Override
      public ChannelFuture syncUninterruptibly() {
          PlatformDependent.throwException(cause);
          return this;
      }
  }