OIDTokenizer


1   /**
2    *  Licensed to the Apache Software Foundation (ASF) under one or more
3    *  contributor license agreements.  See the NOTICE file distributed with
4    *  this work for additional information regarding copyright ownership.
5    *  The ASF licenses this file to You under the Apache License, Version 2.0
6    *  (the "License"); you may not use this file except in compliance with
7    *  the License.  You may obtain a copy of the License at
8    *
9    *     http://www.apache.org/licenses/LICENSE-2.0
10   *
11   *  Unless required by applicable law or agreed to in writing, software
12   *  distributed under the License is distributed on an "AS IS" BASIS,
13   *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14   *  See the License for the specific language governing permissions and
15   *  limitations under the License.
16   */
17  
18  package org.apache.geronimo.util.asn1;
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(
32          String   oid)
33      {
34          this.oid = oid;
35          this.index = 0;
36      }
37  
38      public boolean hasMoreTokens()
39      {
40          return (index != -1);
41      }
42  
43      public String   nextToken()
44      {
45          if (index == -1)
46          {
47              return null;
48          }
49  
50          String    token;
51          int     end = oid.indexOf('.', index);
52  
53          if (end == -1)
54          {
55              token = oid.substring(index);
56              index = -1;
57              return token;
58          }
59  
60          token = oid.substring(index, end);
61  
62          index = end + 1;
63          return token;
64      }
65  }
66
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