URLParser = function(url) {
 this._fields = {'Username' : 4, 'Password' : 5, 'Port' : 7, 'Protocol' : 2, 'Host' : 6, 'Pathname' : 8, 'URL' : 0, 'Querystring' : 9, 'Fragment' : 10};
 this._values = {};
 this._regex = null;
 this.version = 0.1;
 this._regex = /^((\w+):\/\/)?((\w+):?(\w+)?@)?([^\/\?:]+):?(\d+)?(\/?[^\?#]+)?\??([^#]+)?#?(\w*)/;
 for(var f in this._fields)
  this['get' + f] = this._makeGetter(f);
 if (typeof url != 'undefined')
  this._parse(url);
}

URLParser.prototype.setURL = function(url) {
  this._parse(url);
}

URLParser.prototype._initValues = function() {
   for(var f in this._fields)
   this._values[f] = '';
}

URLParser.prototype._parse = function(url) {
  this._initValues();
  var r = this._regex.exec(url);
  if (!r) throw "DPURLParser::_parse -> Invalid URL"
  for(var f in this._fields) if (typeof r[this._fields[f]] != 'undefined')
   this._values[f] = r[this._fields[f]];
}

URLParser.prototype.getDomain = function() {
  var host = this.getHost();
  
  if (host.indexOf('.') == -1)
    return host;
  else
    return host.substring(host.indexOf('.') + 1);
}

URLParser.prototype._makeGetter = function(field) {
 return function() {
  return this._values[field];
 }
}