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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.socks;
17  
18  import org.jboss.netty.buffer.ChannelBuffer;
19  import org.jboss.netty.buffer.ChannelBuffers;
20  import org.jboss.netty.channel.Channel;
21  import org.jboss.netty.channel.ChannelHandler;
22  import org.jboss.netty.channel.ChannelHandlerContext;
23  import org.jboss.netty.handler.codec.oneone.OneToOneEncoder;
24  
25  /**
26   * Encodes an {@link SocksMessage} into a {@link ChannelBuffer}.
27   * {@link OneToOneEncoder} implementation.
28   * Use this with {@link SocksInitRequest}, {@link SocksInitResponse}, {@link SocksAuthRequest},
29   * {@link SocksAuthResponse}, {@link SocksCmdRequest} and {@link SocksCmdResponse}
30   */
31  @ChannelHandler.Sharable
32  public class SocksMessageEncoder extends OneToOneEncoder {
33      private static final int DEFAULT_ENCODER_BUFFER_SIZE = 1024;
34  
35      @Override
36      protected Object encode(ChannelHandlerContext ctx, Channel channel, Object msg) throws Exception {
37          ChannelBuffer buffer = null;
38          if (msg instanceof SocksMessage) {
39              buffer = ChannelBuffers.buffer(DEFAULT_ENCODER_BUFFER_SIZE);
40              ((SocksMessage) msg).encodeAsByteBuf(buffer);
41          }
42          return buffer;
43      }
44  }