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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;
    }
}