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.kerberos.shared.io.decoder;
021    
022    
023    import java.util.Enumeration;
024    
025    import org.apache.directory.server.kerberos.shared.messages.value.PrincipalName;
026    import org.apache.directory.shared.asn1.der.DEREncodable;
027    import org.apache.directory.shared.asn1.der.DERGeneralString;
028    import org.apache.directory.shared.asn1.der.DERInteger;
029    import org.apache.directory.shared.asn1.der.DERSequence;
030    import org.apache.directory.shared.asn1.der.DERTaggedObject;
031    
032    
033    /**
034     * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
035     * @version $Rev: 587146 $, $Date: 2007-10-22 18:28:37 +0200 (Mon, 22 Oct 2007) $
036     */
037    public class PrincipalNameDecoder
038    {
039        /**
040         * Decodes a {@link DERSequence} into a {@link PrincipalName}.
041         * 
042         * PrincipalName ::=   SEQUENCE {
043         *               name-type[0]     INTEGER,
044         *               name-string[1]   SEQUENCE OF GeneralString
045         * }
046         * 
047         * @param sequence 
048         * @return The {@link PrincipalName}.
049         */
050        public static PrincipalName decode( DERSequence sequence )
051        {
052            PrincipalName principalName = new PrincipalName();
053    
054            for ( Enumeration<DEREncodable> e = sequence.getObjects(); e.hasMoreElements(); )
055            {
056                DERTaggedObject object = ( DERTaggedObject ) e.nextElement();
057                int tag = object.getTagNo();
058                DEREncodable derObject = object.getObject();
059    
060                switch ( tag )
061                {
062                    case 0:
063                        DERInteger nameType = ( DERInteger ) derObject;
064                        principalName.setNameType( nameType.intValue() );
065                        break;
066                        
067                    case 1:
068                        DERSequence nameString = ( DERSequence ) derObject;
069                        decodeNameString( nameString, principalName );
070                        break;
071                }
072            }
073    
074            return principalName;
075        }
076    
077    
078        private static void decodeNameString( DERSequence sequence, PrincipalName principalName )
079        {
080            for ( Enumeration<DEREncodable> e = sequence.getObjects(); e.hasMoreElements(); )
081            {
082                DERGeneralString object = ( DERGeneralString ) e.nextElement();
083                principalName.addName( object.getString() );
084            }
085        }
086    }