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1   /*
2    *   Copyright 2005 The Apache Software Foundation
3    *
4    *   Licensed under the Apache License, Version 2.0 (the "License");
5    *   you may not use this file except in compliance with the License.
6    *   You may obtain a copy of the License at
7    *
8    *       http://www.apache.org/licenses/LICENSE-2.0
9    *
10   *   Unless required by applicable law or agreed to in writing, software
11   *   distributed under the License is distributed on an "AS IS" BASIS,
12   *   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13   *   See the License for the specific language governing permissions and
14   *   limitations under the License.
15   *
16   */
17  
18  package org.apache.asn1.der;
19  
20  /***
21   * class for breaking up an OID into it's component tokens, ala
22   * java.util.StringTokenizer. We need this class as some of the
23   * lightweight Java environment don't support classes like
24   * StringTokenizer.
25   */
26  public class OIDTokenizer
27  {
28      private String oid;
29      private int    index;
30  
31      public OIDTokenizer( String oid )
32      {
33          this.oid   = oid;
34          this.index = 0;
35      }
36  
37      public boolean hasMoreTokens()
38      {
39          return ( index != -1 );
40      }
41  
42      public String nextToken()
43      {
44          if ( index == -1 )
45          {
46              return null;
47          }
48  
49          String token;
50          int end = oid.indexOf( '.', index );
51  
52          if ( end == -1 )
53          {
54              token = oid.substring( index );
55              index = -1;
56              return token;
57          }
58  
59          token = oid.substring( index, end );
60  
61          index = end + 1;
62          return token;
63      }
64  }
65