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1   /*
2    * Copyright 2009 Red Hat, Inc.
3    *
4    * Red Hat licenses this file to you under the Apache License, version 2.0
5    * (the "License"); you may not use this file except in compliance with the
6    * License.  You may obtain a copy of the License at:
7    *
8    *    http://www.apache.org/licenses/LICENSE-2.0
9    *
10   * Unless required by applicable law or agreed to in writing, software
11   * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
12   * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
13   * License for the specific language governing permissions and limitations
14   * under the License.
15   */
16  package org.jboss.netty.channel;
17  
18  import static org.jboss.netty.channel.Channels.*;
19  
20  /**
21   * The default {@link ChildChannelStateEvent} implementation.
22   *
23   * @author <a href="http://www.jboss.org/netty/">The Netty Project</a>
24   * @author <a href="http://gleamynode.net/">Trustin Lee</a>
25   *
26   * @version $Rev: 2080 $, $Date: 2010-01-26 18:04:19 +0900 (Tue, 26 Jan 2010) $
27   *
28   */
29  public class DefaultChildChannelStateEvent implements ChildChannelStateEvent {
30  
31      private final Channel parentChannel;
32      private final Channel childChannel;
33  
34      /**
35       * Creates a new instance.
36       */
37      public DefaultChildChannelStateEvent(Channel parentChannel, Channel childChannel) {
38          if (parentChannel == null) {
39              throw new NullPointerException("parentChannel");
40          }
41          if (childChannel == null) {
42              throw new NullPointerException("childChannel");
43          }
44          this.parentChannel = parentChannel;
45          this.childChannel = childChannel;
46      }
47  
48      public Channel getChannel() {
49          return parentChannel;
50      }
51  
52      public ChannelFuture getFuture() {
53          return succeededFuture(getChannel());
54      }
55  
56      public Channel getChildChannel() {
57          return childChannel;
58      }
59  
60      @Override
61      public String toString() {
62          String channelString = getChannel().toString();
63          StringBuilder buf = new StringBuilder(channelString.length() + 32);
64          buf.append(channelString);
65          buf.append(getChildChannel().isOpen()? " CHILD_OPEN: " : " CHILD_CLOSED: ");
66          buf.append(getChildChannel().getId());
67          return buf.toString();
68      }
69  }