Package org.apache.mina.filter.codec.netty

Source Code of org.apache.mina.filter.codec.netty.NettyEncoder

/*
*  Licensed to the Apache Software Foundation (ASF) under one
*  or more contributor license agreements.  See the NOTICE file
*  distributed with this work for additional information
*  regarding copyright ownership.  The ASF 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.apache.mina.filter.codec.netty;

import net.gleamynode.netty2.Message;

import org.apache.mina.common.ByteBuffer;
import org.apache.mina.common.IoSession;
import org.apache.mina.filter.codec.ProtocolEncoder;
import org.apache.mina.filter.codec.ProtocolEncoderException;
import org.apache.mina.filter.codec.ProtocolEncoderOutput;

/**
* A MINA <tt>ProtocolEncoder</tt> that encodes Netty2 {@link Message}s
* into byte buffers.
*
* @author The Apache Directory Project (mina-dev@directory.apache.org)
* @version $Rev: 451854 $, $Date: 2006-10-02 11:30:11 +0900 (월, 02 10월 2006) $,
*/
public class NettyEncoder implements ProtocolEncoder
{
    /**
     * Creates a new instance.
     */
    public NettyEncoder()
    {
    }

    public void encode(IoSession session, Object message, ProtocolEncoderOutput out) throws Exception
    {
        if( !( message instanceof Message ) )
        {
            throw new ProtocolEncoderException(
                    "This encoder can decode only Netty Messages." );
        }

        for( ;; )
        {
            ByteBuffer buf = ByteBuffer.allocate( 8192 );
            Message m = ( Message ) message;
            try
            {
                if( m.write( buf.buf() ) )
                {
                    break;
                }
            }
            finally
            {
                buf.flip();
                if( buf.hasRemaining() )
                {
                    out.write( buf );
                }
                else
                {
                    buf.release();
                }
            }
        }               
    }

    public void dispose( IoSession session ) throws Exception
    {
    }
}
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