/**
  * Returns field name for a given criteria object
  *
  * @param Tx_PtExtlist_Domain_QueryObject_SimpleCriteria $criteria
  * @return string Fieldname
  */
 protected static function getPropertyNameByCriteria(Tx_PtExtlist_Domain_QueryObject_SimpleCriteria $criteria)
 {
     list($predot, $postdot) = explode('.', $criteria->getField());
     return $postdot != '' ? $postdot : $predot;
 }