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The Netty project is an effort to provide an asynchronous event-driven network application framework and tools for rapid development of maintainable high performance and high scalability protocol servers and clients. In other words, Netty is a NIO client server framework which enables quick and easy development of network applications such as protocol servers and clients. It greatly simplifies and streamlines network programming such as TCP and UDP socket server.

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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;
    }
}