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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.KerberosTime;
26  import org.apache.directory.server.kerberos.shared.messages.value.LastRequest;
27  import org.apache.directory.server.kerberos.shared.messages.value.LastRequestEntry;
28  import org.apache.directory.server.kerberos.shared.messages.value.LastRequestType;
29  import org.apache.directory.shared.asn1.der.DEREncodable;
30  import org.apache.directory.shared.asn1.der.DERGeneralizedTime;
31  import org.apache.directory.shared.asn1.der.DERInteger;
32  import org.apache.directory.shared.asn1.der.DERSequence;
33  import org.apache.directory.shared.asn1.der.DERTaggedObject;
34  
35  
36  /**
37   * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
38   * @version $Rev: 589780 $, $Date: 2007-10-29 19:14:59 +0100 (Mo, 29 Okt 2007) $
39   */
40  public class LastRequestDecoder
41  {
42      /**
43       * LastReq ::=   SEQUENCE OF SEQUENCE {
44       * lr-type[0]               INTEGER,
45       * lr-value[1]              KerberosTime
46       * }
47       */
48      protected static LastRequest decodeSequence( DERSequence sequence )
49      {
50          LastRequestEntry[] entries = new LastRequestEntry[sequence.size()];
51  
52          int ii = 0;
53          for ( Enumeration<DEREncodable> e = sequence.getObjects(); e.hasMoreElements(); )
54          {
55              DERSequence object = ( DERSequence ) e.nextElement();
56              LastRequestEntry entry = decode( object );
57              entries[ii] = entry;
58              ii++;
59          }
60  
61          return new LastRequest( entries );
62      }
63  
64  
65      protected static LastRequestEntry decode( DERSequence sequence )
66      {
67          LastRequestType type = LastRequestType.NONE;
68          KerberosTime value = null;
69  
70          for ( Enumeration<DEREncodable> e = sequence.getObjects(); e.hasMoreElements(); )
71          {
72              DERTaggedObject object = ( DERTaggedObject ) e.nextElement();
73              int tag = object.getTagNo();
74              DEREncodable derObject = object.getObject();
75  
76              switch ( tag )
77              {
78                  case 0:
79                      DERInteger tag0 = ( DERInteger ) derObject;
80                      type = LastRequestType.getTypeByOrdinal( tag0.intValue() );
81                      break;
82                  case 1:
83                      DERGeneralizedTime tag1 = ( DERGeneralizedTime ) derObject;
84                      value = KerberosTimeDecoder.decode( tag1 );
85                      break;
86              }
87          }
88  
89          return new LastRequestEntry( type, value );
90      }
91  }