/*
 * 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 tokens_;
  private int       current_;
  

  
  public SmartTokenizer (String string, String delimiter)
  {
    tokens_  = new ArrayList();
    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 + "#");
    }
  }
}