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1   /*
2    * Copyright 2012 The Netty Project
3    *
4    * The Netty Project licenses this file to you under the Apache License,
5    * version 2.0 (the "License"); you may not use this file except in compliance
6    * with the 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.ChannelHandler.Sharable;
21  import org.jboss.netty.channel.ChannelHandlerContext;
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   *
30   * @apiviz.landmark
31   */
32  @Sharable
33  public abstract class RtspMessageEncoder extends HttpMessageEncoder {
34  
35      /**
36       * Creates a new instance.
37       */
38      protected RtspMessageEncoder() {
39      }
40  
41      @Override
42      protected Object encode(ChannelHandlerContext ctx, Channel channel,
43              Object msg) throws Exception {
44          // Ignore unrelated message types such as HttpChunk.
45          if (!(msg instanceof HttpMessage)) {
46              return msg;
47          }
48          return super.encode(ctx, channel, msg);
49      }
50  }