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1   /*
2    *  Licensed to the Apache Software Foundation (ASF) under one
3    *  or more contributor license agreements.  See the NOTICE file
4    *  distributed with this work for additional information
5    *  regarding copyright ownership.  The ASF licenses this file
6    *  to you under the Apache License, Version 2.0 (the
7    *  "License"); you may not use this file except in compliance
8    *  with the License.  You may obtain a copy of the License at
9    *  
10   *    http://www.apache.org/licenses/LICENSE-2.0
11   *  
12   *  Unless required by applicable law or agreed to in writing,
13   *  software distributed under the License is distributed on an
14   *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
15   *  KIND, either express or implied.  See the License for the
16   *  specific language governing permissions and limitations
17   *  under the License. 
18   *  
19   */
20  package org.apache.directory.server.kerberos.shared.io.decoder;
21  
22  
23  import java.util.Enumeration;
24  
25  import org.apache.directory.server.kerberos.shared.messages.value.PrincipalName;
26  import org.apache.directory.shared.asn1.der.DEREncodable;
27  import org.apache.directory.shared.asn1.der.DERGeneralString;
28  import org.apache.directory.shared.asn1.der.DERInteger;
29  import org.apache.directory.shared.asn1.der.DERSequence;
30  import org.apache.directory.shared.asn1.der.DERTaggedObject;
31  
32  
33  /**
34   * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
35   * @version $Rev: 587146 $, $Date: 2007-10-22 18:28:37 +0200 (Mo, 22 Okt 2007) $
36   */
37  public class PrincipalNameDecoder
38  {
39      /**
40       * Decodes a {@link DERSequence} into a {@link PrincipalName}.
41       * 
42       * PrincipalName ::=   SEQUENCE {
43       *               name-type[0]     INTEGER,
44       *               name-string[1]   SEQUENCE OF GeneralString
45       * }
46       * 
47       * @param sequence 
48       * @return The {@link PrincipalName}.
49       */
50      public static PrincipalName decode( DERSequence sequence )
51      {
52          PrincipalName principalName = new PrincipalName();
53  
54          for ( Enumeration<DEREncodable> e = sequence.getObjects(); e.hasMoreElements(); )
55          {
56              DERTaggedObject object = ( DERTaggedObject ) e.nextElement();
57              int tag = object.getTagNo();
58              DEREncodable derObject = object.getObject();
59  
60              switch ( tag )
61              {
62                  case 0:
63                      DERInteger nameType = ( DERInteger ) derObject;
64                      principalName.setNameType( nameType.intValue() );
65                      break;
66                      
67                  case 1:
68                      DERSequence nameString = ( DERSequence ) derObject;
69                      decodeNameString( nameString, principalName );
70                      break;
71              }
72          }
73  
74          return principalName;
75      }
76  
77  
78      private static void decodeNameString( DERSequence sequence, PrincipalName principalName )
79      {
80          for ( Enumeration<DEREncodable> e = sequence.getObjects(); e.hasMoreElements(); )
81          {
82              DERGeneralString object = ( DERGeneralString ) e.nextElement();
83              principalName.addName( object.getString() );
84          }
85      }
86  }