/*
 * MapStringParser.java
 *
 * Copyright (C) 2003 Miika Nurminen
 *
 * This library 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 library 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 library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 *
 */
import java.util.StringTokenizer;
import java.util.Map;
import java.util.HashMap;
/**
 * Parses strings of type key1=value1;key2=value2;... to a map.
 * Can be used for example to parse a CSS-styled declaration.
 *
 * @version 0.1 - 2003-8-7
 * @author  minurmin
 */
public class MapStringParser {
  String itemSeparator;
  String pairSeparator;
  
  public MapStringParser() {
    this.itemSeparator = "=";
    this.pairSeparator = ";";
  }
  
  public MapStringParser(String itemSeparator,String pairSeparator) {
    this.itemSeparator = itemSeparator;
    this.pairSeparator = pairSeparator;
  }

  public Map parse(String s) {
    Map result = new HashMap();
    if (s==null) return result;
    
    StringTokenizer t = new StringTokenizer(s,pairSeparator);
    while (t.hasMoreTokens()) {
      StringTokenizer inner = new StringTokenizer(t.nextToken(),itemSeparator,true);
      if (inner.hasMoreTokens()) {
        String key = inner.nextToken();
        String value = "";
        if (key.equals(itemSeparator)) {
          key = "";
        }
        else inner.nextToken(); // this should be a separator.
        if (inner.hasMoreTokens()) value = inner.nextToken();

        result.put(key,value);
      }
      else result.put("","");
    }
    return result;
  }


 
// UNIT TEST -----------------------------------------------------------------
  
  private static void test(String s) {
    MapStringParser p = new MapStringParser();
    Map m = p.parse(s);
    System.out.println(m.toString());
  }
  
  /**
   * Unit test. Working. 
   * @param args the command line arguments
   */
  public static void main(String[] args) {
    test("testi=val1;toinen=val2");
    test("");
    test("noval=;=nokey");
    test(null);
    test("another=21323;=");
  }
  
}