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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  }