public static Color convertToEnum(String color_name)
  {
    switch(color_name.toUpperCase())
    {
      case "YELLOW" : return Color.YELLOW;
      case "WHITE" : return Color.WHITE;
      case "BROWN" : return Color.BROWN;
      case "BLUE" : return Color.BLUE;
      case "RED" : return Color.RED;
      case "GREEN" : return Color.GREEN;
    }
    return null;
  }