/*
    * This code is free software; you can redistribute it and/or
    * modify it under the terms of the GNU Lesser General Public 
    * License as published by the Free Software Foundation; either 
    * version 2.1 of the License, or (at your option) any later version.
    *
    * This code is distributed in the hope that it will be useful,
    * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
   * GNU Lesser General Public License for more details.
   *
   * You should have received a copy of the GNU Lesser General Public 
   * License along with this program; if not, write to the Free 
   * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, 
   * MA  02111-1307, USA.
   */
  package no.geosoft.cc.util;
  
  
  
  import java.util.ArrayList;
  
  
  
  /**
   * A StringTokenizer class that handle empty tokens.
   * 
   * @author <a href="mailto:info@geosoft.no">GeoSoft</a>
   */   
  public class SmartTokenizer 
  {
    private ArrayList <String>tokens_;
    private int       current_;
    
  
    
    public SmartTokenizer (String string, String delimiter)
    {
      tokens_  = new ArrayList <String> ();
      current_ = 0;
      
      java.util.StringTokenizer tokenizer =
        new java.util.StringTokenizer (string, delimiter, true);
  
      boolean wasDelimiter = true;
      boolean isDelimiter  = false;    
      
      while (tokenizer.hasMoreTokens()) {
        String token = tokenizer.nextToken();
  
        isDelimiter = token.equals (delimiter);
        
        if (wasDelimiter)
          tokens_.add (isDelimiter ? "" : token);
        else if (!isDelimiter)
          tokens_.add (token);
  
        wasDelimiter = isDelimiter;
      }
  
      if (isDelimiter) tokens_.add ("");
    }
  
  
    public int countTokens()
    {
      return tokens_.size();
    }
  
    
    public boolean hasMoreTokens()
    {
      return current_ < tokens_.size();
    }
  
  
    public boolean hasMoreElements()
    {
      return hasMoreTokens();
    }
  
  
    public Object nextElement()
    {
      return nextToken();
    }
  
  
    public String nextToken()
    {
      String token = (String) tokens_.get (current_);
      current_++;
      return token;
    }
    
    
  
    /**
    * Testing this class.
    * 
    * @param args  Not used.
    */
   public static void main (String args[])
   {
     SmartTokenizer t = new SmartTokenizer ("This,is,a,,test,", ",");
     while (t.hasMoreTokens()) {
       String token = t.nextToken();
       System.out.println ("#" + token + "#");
     }
   }
 }