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//
// MessagePack-RPC for Java
//
// Copyright (C) 2010 FURUHASHI Sadayuki
//
//    Licensed 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.msgpack.rpc.loop.netty;

import org.jboss.netty.channel.Channel;
import org.jboss.netty.channel.ChannelHandlerContext;
import org.jboss.netty.buffer.ChannelBuffer;
import org.jboss.netty.buffer.ChannelBufferOutputStream;
import org.jboss.netty.buffer.ChannelBuffers;
import org.jboss.netty.handler.codec.oneone.OneToOneEncoder;
import org.msgpack.MessagePack;

public class MessagePackEncoder extends OneToOneEncoder {
    private final int estimatedLength;

    private MessagePack messagePack;

    public MessagePackEncoder(MessagePack messagePack) {
        this(1024, messagePack);
    }

    public MessagePackEncoder(int estimatedLength, MessagePack messagePack) {
        this.estimatedLength = estimatedLength;
        this.messagePack = messagePack;
    }

    @Override
    protected Object encode(ChannelHandlerContext ctx, Channel channel,
            Object msg) throws Exception {
        if (msg instanceof ChannelBuffer) {
            return msg;
        }

        ChannelBufferOutputStream out = new ChannelBufferOutputStream(
                ChannelBuffers.dynamicBuffer(estimatedLength, ctx.getChannel()
                        .getConfig().getBufferFactory()));

        // MessagePack.pack(out, msg);
        messagePack.write(out, msg);

        ChannelBuffer result = out.buffer();
        return result;
    }
}