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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.CompleteFuture;
  import io.netty.util.concurrent.EventExecutor;
  import io.netty.util.concurrent.Future;
  import io.netty.util.concurrent.GenericFutureListener;
  import io.netty.util.internal.ObjectUtil;
  
  /**
   * A skeletal {@link ChannelFuture} implementation which represents a
   * {@link ChannelFuture} which has been completed already.
   */
  abstract class CompleteChannelFuture extends CompleteFuture<Void> implements ChannelFuture {
  
      private final Channel channel;
  
      /**
       * Creates a new instance.
       *
       * @param channel the {@link Channel} associated with this future
       */
      protected CompleteChannelFuture(Channel channel, EventExecutor executor) {
          super(executor);
          this.channel = ObjectUtil.checkNotNull(channel, "channel");
      }
  
      @Override
      protected EventExecutor executor() {
          EventExecutor e = super.executor();
          if (e == null) {
              return channel().eventLoop();
          } else {
              return e;
          }
      }
  
      @Override
      public ChannelFuture addListener(GenericFutureListener<? extends Future<? super Void>> listener) {
          super.addListener(listener);
          return this;
      }
  
      @Override
      public ChannelFuture addListeners(GenericFutureListener<? extends Future<? super Void>>... listeners) {
          super.addListeners(listeners);
          return this;
      }
  
      @Override
      public ChannelFuture removeListener(GenericFutureListener<? extends Future<? super Void>> listener) {
          super.removeListener(listener);
          return this;
      }
  
      @Override
      public ChannelFuture removeListeners(GenericFutureListener<? extends Future<? super Void>>... listeners) {
          super.removeListeners(listeners);
          return this;
      }
  
      @Override
      public ChannelFuture syncUninterruptibly() {
          return this;
      }
  
      @Override
      public ChannelFuture sync() throws InterruptedException {
          return this;
      }
  
      @Override
      public ChannelFuture await() throws InterruptedException {
          return this;
      }
  
      @Override
      public ChannelFuture awaitUninterruptibly() {
          return this;
      }
  
      @Override
      public Channel channel() {
          return channel;
      }
 
     @Override
     public Void getNow() {
         return null;
     }
 
     @Override
     public boolean isVoid() {
         return false;
     }
 }