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   /*
    * Copyright 2016 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.group;
  
  import io.netty.channel.Channel;
  import io.netty.channel.ChannelFuture;
  import io.netty.util.concurrent.Future;
  import io.netty.util.concurrent.GenericFutureListener;
  
  import java.util.Collections;
  import java.util.Iterator;
  import java.util.concurrent.TimeUnit;
  
  // Suppress a warning about returning the same iterator since it always returns an empty iterator
  final class VoidChannelGroupFuture implements ChannelGroupFuture {
  
      private static final Iterator<ChannelFuture> EMPTY = Collections.<ChannelFuture>emptyList().iterator();
      private final ChannelGroup group;
  
      VoidChannelGroupFuture(ChannelGroup group) {
          this.group = group;
      }
  
      @Override
      public ChannelGroup group() {
          return group;
      }
  
      @Override
      public ChannelFuture find(Channel channel) {
          return null;
      }
  
      @Override
      public boolean isSuccess() {
          return false;
      }
  
      @Override
      public ChannelGroupException cause() {
          return null;
      }
  
      @Override
      public boolean isPartialSuccess() {
          return false;
      }
  
      @Override
      public boolean isPartialFailure() {
          return false;
      }
  
      @Override
      public ChannelGroupFuture addListener(GenericFutureListener<? extends Future<? super Void>> listener) {
          throw reject();
      }
  
      @Override
      public ChannelGroupFuture addListeners(GenericFutureListener<? extends Future<? super Void>>... listeners) {
          throw reject();
      }
  
      @Override
      public ChannelGroupFuture removeListener(GenericFutureListener<? extends Future<? super Void>> listener) {
          throw reject();
      }
  
      @Override
      public ChannelGroupFuture removeListeners(GenericFutureListener<? extends Future<? super Void>>... listeners) {
          throw reject();
      }
  
      @Override
      public ChannelGroupFuture await() {
          throw reject();
      }
  
      @Override
      public ChannelGroupFuture awaitUninterruptibly() {
          throw reject();
      }
  
      @Override
      public ChannelGroupFuture syncUninterruptibly() {
          throw reject();
     }
 
     @Override
     public ChannelGroupFuture sync() {
         throw reject();
     }
 
     @Override
     public Iterator<ChannelFuture> iterator() {
         return EMPTY;
     }
 
     @Override
     public boolean isCancellable() {
         return false;
     }
 
     @Override
     public boolean await(long timeout, TimeUnit unit) {
         throw reject();
     }
 
     @Override
     public boolean await(long timeoutMillis) {
         throw reject();
     }
 
     @Override
     public boolean awaitUninterruptibly(long timeout, TimeUnit unit) {
         throw reject();
     }
 
     @Override
     public boolean awaitUninterruptibly(long timeoutMillis) {
         throw reject();
     }
 
     @Override
     public Void getNow() {
         return null;
     }
 
     /**
      * {@inheritDoc}
      *
      * @param mayInterruptIfRunning this value has no effect in this implementation.
      */
     @Override
     public boolean cancel(boolean mayInterruptIfRunning) {
         return false;
     }
 
     @Override
     public boolean isCancelled() {
         return false;
     }
 
     @Override
     public boolean isDone() {
         return false;
     }
 
     @Override
     public Void get() {
         throw reject();
     }
 
     @Override
     public Void get(long timeout, TimeUnit unit)  {
         throw reject();
     }
 
     private static RuntimeException reject() {
         return new IllegalStateException("void future");
     }
 }