/**
  * Build the filterCriteria for filter
  *
  * @return Tx_PtExtlist_Domain_QueryObject_Criteria
  */
 protected function buildFilterCriteriaForAllFields()
 {
     $criteria = NULL;
     if ($this->filterValue == '') {
         return NULL;
     }
     $criteria = Tx_PtExtlist_Domain_QueryObject_Criteria::fullText($this->fieldIdentifierCollection, $this->filterValue, $this->getSearchParameterArray());
     return $criteria;
 }