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   /*
    * Copyright 2012 The Netty Project
    *
    * The Netty Project licenses this file to you under the Apache License,
    * version 2.0 (the "License"); you may not use this file except in compliance
    * with the License. You may obtain a copy of the License at:
    *
    *   http://www.apache.org/licenses/LICENSE-2.0
    *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
   * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
   * License for the specific language governing permissions and limitations
   * under the License.
   */
  package org.jboss.netty.handler.codec.socks;
  
  import org.jboss.netty.buffer.ChannelBuffer;
  import org.jboss.netty.buffer.ChannelBuffers;
  import org.jboss.netty.channel.Channel;
  import org.jboss.netty.channel.ChannelHandler;
  import org.jboss.netty.channel.ChannelHandlerContext;
  import org.jboss.netty.handler.codec.oneone.OneToOneEncoder;
  
  /**
   * Encodes an {@link SocksMessage} into a {@link ChannelBuffer}.
   * {@link OneToOneEncoder} implementation.
   * Use this with {@link SocksInitRequest}, {@link SocksInitResponse}, {@link SocksAuthRequest},
   * {@link SocksAuthResponse}, {@link SocksCmdRequest} and {@link SocksCmdResponse}
   */
  @ChannelHandler.Sharable
  public class SocksMessageEncoder extends OneToOneEncoder {
      private static final int DEFAULT_ENCODER_BUFFER_SIZE = 1024;
  
      @Override
      protected Object encode(ChannelHandlerContext ctx, Channel channel, Object msg) throws Exception {
          ChannelBuffer buffer = null;
          if (msg instanceof SocksMessage) {
              buffer = ChannelBuffers.buffer(DEFAULT_ENCODER_BUFFER_SIZE);
              ((SocksMessage) msg).encodeAsByteBuf(buffer);
          }
          return buffer;
      }
  }