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      1 package org.bouncycastle.asn1.x500.style;
      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 X500NameTokenizer
     10 {
     11     private String          value;
     12     private int             index;
     13     private char            separator;
     14     private StringBuffer    buf = new StringBuffer();
     15 
     16     public X500NameTokenizer(
     17         String  oid)
     18     {
     19         this(oid, ',');
     20     }
     21 
     22     public X500NameTokenizer(
     23         String  oid,
     24         char    separator)
     25     {
     26         this.value = oid;
     27         this.index = -1;
     28         this.separator = separator;
     29     }
     30 
     31     public boolean hasMoreTokens()
     32     {
     33         return (index != value.length());
     34     }
     35 
     36     public String nextToken()
     37     {
     38         if (index == value.length())
     39         {
     40             return null;
     41         }
     42 
     43         int     end = index + 1;
     44         boolean quoted = false;
     45         boolean escaped = false;
     46 
     47         buf.setLength(0);
     48 
     49         while (end != value.length())
     50         {
     51             char    c = value.charAt(end);
     52 
     53             if (c == '"')
     54             {
     55                 if (!escaped)
     56                 {
     57                     quoted = !quoted;
     58                 }
     59                 buf.append(c);
     60                 escaped = false;
     61             }
     62             else
     63             {
     64                 if (escaped || quoted)
     65                 {
     66                     buf.append(c);
     67                     escaped = false;
     68                 }
     69                 else if (c == '\\')
     70                 {
     71                     buf.append(c);
     72                     escaped = true;
     73                 }
     74                 else if (c == separator)
     75                 {
     76                     break;
     77                 }
     78                 else
     79                 {
     80                     buf.append(c);
     81                 }
     82             }
     83             end++;
     84         }
     85 
     86         index = end;
     87 
     88         return buf.toString();
     89     }
     90 }
     91