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1   /*
2    * Copyright 2010 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.handler.codec.rtsp;
17  
18  import org.jboss.netty.buffer.ChannelBuffer;
19  import org.jboss.netty.channel.Channel;
20  import org.jboss.netty.channel.ChannelHandlerContext;
21  import org.jboss.netty.channel.ChannelHandler.Sharable;
22  import org.jboss.netty.handler.codec.http.HttpMessage;
23  import org.jboss.netty.handler.codec.http.HttpMessageEncoder;
24  
25  /**
26   * Encodes an RTSP message represented in {@link HttpMessage} into
27   * a {@link ChannelBuffer}.
28  
29   * @author <a href="http://www.jboss.org/netty/">The Netty Project</a>
30   * @author <a href="http://amitbhayani.blogspot.com/">Amit Bhayani</a>
31   * @author <a href="http://gleamynode.net/">Trustin Lee</a>
32   * @version $Rev: 2243 $, $Date: 2010-04-16 14:01:55 +0900 (Fri, 16 Apr 2010) $
33   *
34   * @apiviz.landmark
35   */
36  @Sharable
37  public abstract class RtspMessageEncoder extends HttpMessageEncoder {
38  
39      /**
40       * Creates a new instance.
41       */
42      protected RtspMessageEncoder() {
43          super();
44      }
45  
46      @Override
47      protected Object encode(ChannelHandlerContext ctx, Channel channel,
48              Object msg) throws Exception {
49          // Ignore unrelated message types such as HttpChunk.
50          if (!(msg instanceof HttpMessage)) {
51              return msg;
52          }
53          return super.encode(ctx, channel, msg);
54      }
55  }