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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          super();
    40      }
    41
    42      @Override
    43      protected Object encode(ChannelHandlerContext ctx, Channel channel,
    44              Object msg) throws Exception {
    45          // Ignore unrelated message types such as HttpChunk.
    46          if (!(msg instanceof HttpMessage)) {
    47              return msg;
    48          }
    49          return super.encode(ctx, channel, msg);
    50      }
    51  }