OIDTokenizer


1   /*
2    *  SSL-Explorer
3    *
4    *  Copyright (C) 2003-2006 3SP LTD. All Rights Reserved
5    *
6    *  This program is free software; you can redistribute it and/or
7    *  modify it under the terms of the GNU General Public License
8    *  as published by the Free Software Foundation; either version 2 of
9    *  the License, or (at your option) any later version.
10   *  This program is distributed in the hope that it will be useful,
11   *  but WITHOUT ANY WARRANTY; without even the implied warranty of
12   *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
13   *  GNU General Public License for more details.
14   *
15   *  You should have received a copy of the GNU General Public
16   *  License along with this program; if not, write to the Free Software
17   *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
18   */
19              
20  package com.maverick.crypto.asn1;
21  
22  /**
23   * class for breaking up an OID into it's component tokens, ala
24   * java.util.StringTokenizer. We need this class as some of the
25   * lightweight Java environment don't support classes like
26   * StringTokenizer.
27   */
28  public class OIDTokenizer
29  {
30      private String    oid;
31      private int     index;
32  
33      public OIDTokenizer(
34          String   oid)
35      {
36          this.oid = oid;
37          this.index = 0;
38      }
39  
40      public boolean hasMoreTokens()
41      {
42          return (index != -1);
43      }
44  
45      public String   nextToken()
46      {
47          if (index == -1)
48          {
49              return null;
50          }
51  
52          String    token;
53          int     end = oid.indexOf('.', index);
54  
55          if (end == -1)
56          {
57              token = oid.substring(index);
58              index = -1;
59              return token;
60          }
61  
62          token = oid.substring(index, end);
63  
64          index = end + 1;
65          return token;
66      }
67  }
68
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