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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;
  
  import java.net.SocketAddress;
  
  import org.jboss.netty.util.internal.StringUtil;
  
  /**
   * The default downstream {@link MessageEvent} implementation.
   */
  public class DownstreamMessageEvent implements MessageEvent {
  
      private final Channel channel;
      private final ChannelFuture future;
      private final Object message;
      private final SocketAddress remoteAddress;
  
      /**
       * Creates a new instance.
       */
      public DownstreamMessageEvent(
              Channel channel, ChannelFuture future,
              Object message, SocketAddress remoteAddress) {
  
          if (channel == null) {
              throw new NullPointerException("channel");
          }
          if (future == null) {
              throw new NullPointerException("future");
          }
          if (message == null) {
              throw new NullPointerException("message");
          }
          this.channel = channel;
          this.future = future;
          this.message = message;
          if (remoteAddress != null) {
              this.remoteAddress = remoteAddress;
          } else {
              this.remoteAddress = channel.getRemoteAddress();
          }
      }
  
      public Channel getChannel() {
          return channel;
      }
  
      public ChannelFuture getFuture() {
          return future;
      }
  
      public Object getMessage() {
          return message;
      }
  
      public SocketAddress getRemoteAddress() {
          return remoteAddress;
      }
  
      @Override
      public String toString() {
          if (getRemoteAddress() == getChannel().getRemoteAddress()) {
              return getChannel().toString() + " WRITE: " +
                     StringUtil.stripControlCharacters(getMessage());
          } else {
              return getChannel().toString() + " WRITE: " +
                     StringUtil.stripControlCharacters(getMessage()) + " to " +
                     getRemoteAddress();
          }
      }
  }