src/org/bouncycastle/asn1/x509/X509NameTokenizer.java

   1 package org.bouncycastle.asn1.x509;
   2
   3 /**
   4  * class for breaking up an X500 Name into it's component tokens, ala
   5  * java.util.StringTokenizer. We need this class as some of the
   6  * lightweight Java environment don't support classes like
   7  * StringTokenizer.
   8  */
   9 public class X509NameTokenizer
  10 {
  11     private String          oid;
  12     private int             index;
  13     private StringBuffer    buf = new StringBuffer();
  14
  15     public X509NameTokenizer(
  16         String oid)
  17     {
  18         this.oid = oid;
  19         this.index = -1;
  20     }
  21
  22     public boolean hasMoreTokens()
  23     {
  24         return (index != oid.length());
  25     }
  26
  27     public String nextToken()
  28     {
  29         if (index == oid.length())
  30         {
  31             return null;
  32         }
  33
  34         int     end = index + 1;
  35         boolean quoted = false;
  36         boolean escaped = false;
  37
  38         buf.setLength(0);
  39
  40         while (end != oid.length())
  41         {
  42             char    c = oid.charAt(end);
  43
  44             if (c == '"')
  45             {
  46                 if (!escaped)
  47                 {
  48                     quoted = !quoted;
  49                 }
  50                 else
  51                 {
  52                     buf.append(c);
  53                 }
  54                 escaped = false;
  55             }
  56             else
  57             {
  58                 if (escaped || quoted)
  59                 {
  60                     buf.append(c);
  61                     escaped = false;
  62                 }
  63                 else if (c == '\\')
  64                 {
  65                     escaped = true;
  66                 }
  67                 else if (c == ',')
  68                 {
  69                     break;
  70                 }
  71                 else
  72                 {
  73                     buf.append(c);
  74                 }
  75             }
  76             end++;
  77         }
  78
  79         index = end;
  80         return buf.toString().trim();
  81     }
  82 }