/*
    * Copyright 2009 Red Hat, Inc.
    *
    * Red Hat 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 default downstream {@link ChannelStateEvent} implementation.
   *
   * @author <a href="http://www.jboss.org/netty/">The Netty Project</a>
   * @author <a href="http://gleamynode.net/">Trustin Lee</a>
   *
   * @version $Rev: 2080 $, $Date: 2010-01-26 18:04:19 +0900 (Tue, 26 Jan 2010) $
   *
   */
  public class DownstreamChannelStateEvent implements ChannelStateEvent {
  
      private final Channel channel;
      private final ChannelFuture future;
      private final ChannelState state;
      private final Object value;
  
      /**
       * Creates a new instance.
       */
      public DownstreamChannelStateEvent(
              Channel channel, ChannelFuture future,
              ChannelState state, Object value) {
  
          if (channel == null) {
              throw new NullPointerException("channel");
          }
          if (future == null) {
              throw new NullPointerException("future");
          }
          if (state == null) {
              throw new NullPointerException("state");
          }
          this.channel = channel;
          this.future = future;
          this.state = state;
          this.value = value;
      }
  
      public Channel getChannel() {
          return channel;
      }
  
      public ChannelFuture getFuture() {
          return future;
      }
  
      public ChannelState getState() {
          return state;
      }
  
      public Object getValue() {
          return value;
      }
  
      @Override
      public String toString() {
          String channelString = getChannel().toString();
          StringBuilder buf = new StringBuilder(channelString.length() + 64);
          buf.append(channelString);
          switch (getState()) {
          case OPEN:
              if (Boolean.TRUE.equals(getValue())) {
                  buf.append(" OPEN");
              } else {
                  buf.append(" CLOSE");
              }
              break;
          case BOUND:
              if (getValue() != null) {
                  buf.append(" BIND: ");
                  buf.append(getValue());
              } else {
                  buf.append(" UNBIND");
              }
              break;
          case CONNECTED:
              if (getValue() != null) {
                  buf.append(" CONNECT: ");
                  buf.append(getValue());
              } else {
                  buf.append(" DISCONNECT");
              }
             break;
         case INTEREST_OPS:
             buf.append(" CHANGE_INTEREST: ");
             buf.append(getValue());
             break;
         default:
             buf.append(' ');
             buf.append(getState().name());
             buf.append(": ");
             buf.append(getValue());
         }
         return buf.toString();
     }
 }