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    package org.apache.directory.server.changepw.io;
021    
022    
023    import java.io.IOException;
024    import java.nio.ByteBuffer;
025    
026    import org.apache.directory.server.changepw.messages.ChangePasswordReply;
027    import org.apache.directory.server.changepw.messages.ChangePasswordReplyModifier;
028    import org.apache.directory.server.kerberos.shared.io.decoder.ApplicationReplyDecoder;
029    import org.apache.directory.server.kerberos.shared.io.decoder.PrivateMessageDecoder;
030    import org.apache.directory.server.kerberos.shared.messages.application.ApplicationReply;
031    import org.apache.directory.server.kerberos.shared.messages.application.PrivateMessage;
032    
033    
034    /**
035     * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
036     * @version $Rev$, $Date$
037     */
038    public class ChangePasswordReplyDecoder
039    {
040        private static final int HEADER_LENGTH = 6;
041    
042    
043        /**
044         * Decodes a {@link ByteBuffer} into a {@link ChangePasswordReply}.
045         *
046         * @param buf
047         * @return The {@link ChangePasswordReply}.
048         * @throws IOException
049         */
050        public ChangePasswordReply decode( ByteBuffer buf ) throws IOException
051        {
052            ChangePasswordReplyModifier modifier = new ChangePasswordReplyModifier();
053    
054            short messageLength = buf.getShort();
055            short protocolVersion = buf.getShort();
056            short encodedAppReplyLength = buf.getShort();
057    
058            modifier.setProtocolVersionNumber( protocolVersion );
059    
060            byte[] encodedAppReply = new byte[encodedAppReplyLength];
061            buf.get( encodedAppReply );
062    
063            ApplicationReplyDecoder appDecoder = new ApplicationReplyDecoder();
064            ApplicationReply applicationReply = appDecoder.decode( encodedAppReply );
065            modifier.setApplicationReply( applicationReply );
066    
067            int privateBytesLength = messageLength - HEADER_LENGTH - encodedAppReplyLength;
068            byte[] encodedPrivateMessage = new byte[privateBytesLength];
069            buf.get( encodedPrivateMessage );
070    
071            PrivateMessageDecoder privateDecoder = new PrivateMessageDecoder();
072            PrivateMessage privateMessage = privateDecoder.decode( encodedPrivateMessage );
073            modifier.setPrivateMessage( privateMessage );
074    
075            return modifier.getChangePasswordReply();
076        }
077    }