001    /*
002     *  Licensed to the Apache Software Foundation (ASF) under one
003     *  or more contributor license agreements.  See the NOTICE file
004     *  distributed with this work for additional information
005     *  regarding copyright ownership.  The ASF licenses this file
006     *  to you under the Apache License, Version 2.0 (the
007     *  "License"); you may not use this file except in compliance
008     *  with the License.  You may obtain a copy of the License at
009     *  
010     *    http://www.apache.org/licenses/LICENSE-2.0
011     *  
012     *  Unless required by applicable law or agreed to in writing,
013     *  software distributed under the License is distributed on an
014     *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
015     *  KIND, either express or implied.  See the License for the
016     *  specific language governing permissions and limitations
017     *  under the License. 
018     *  
019     */
020    
021    package org.apache.directory.server.changepw.protocol;
022    
023    
024    import java.io.IOException;
025    
026    import org.apache.directory.server.changepw.io.ChangePasswordErrorEncoder;
027    import org.apache.directory.server.changepw.io.ChangePasswordReplyEncoder;
028    import org.apache.directory.server.changepw.messages.ChangePasswordError;
029    import org.apache.directory.server.changepw.messages.ChangePasswordReply;
030    import org.apache.mina.core.buffer.IoBuffer;
031    import org.apache.mina.core.session.IoSession;
032    import org.apache.mina.filter.codec.ProtocolEncoderAdapter;
033    import org.apache.mina.filter.codec.ProtocolEncoderOutput;
034    
035    
036    /**
037     * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
038     * @version $Rev: 549315 $, $Date: 2007-06-20 18:13:53 -0700 (Wed, 20 Jun 2007) $
039     */
040    public class ChangePasswordTcpEncoder extends ProtocolEncoderAdapter
041    {
042        ChangePasswordReplyEncoder replyEncoder = new ChangePasswordReplyEncoder();
043        ChangePasswordErrorEncoder errorEncoder = new ChangePasswordErrorEncoder();
044    
045    
046        public void encode( IoSession session, Object message, ProtocolEncoderOutput out ) throws IOException
047        {
048            IoBuffer buf = IoBuffer.allocate( 512 );
049    
050            // make space for int length
051            buf.putInt( 0 );
052    
053            if ( message instanceof ChangePasswordReply )
054            {
055                replyEncoder.encode( buf.buf(), ( ChangePasswordReply ) message );
056            }
057            else
058            {
059                if ( message instanceof ChangePasswordError )
060                {
061                    errorEncoder.encode( buf.buf(), ( ChangePasswordError ) message );
062                }
063            }
064    
065            // mark position
066            int pos = buf.position();
067    
068            // length is the data minus 4 bytes for the pre-pended length
069            int recordLength = buf.position() - 4;
070    
071            // write the length
072            buf.rewind();
073            buf.putInt( recordLength );
074    
075            // set the position back before flipping the buffer
076            buf.position( pos );
077            buf.flip();
078    
079            out.write( buf );
080        }
081    }