private function retrieveUsedFiltersType($data)
    {
        $usedTypes = array();
        foreach($data as $alias => $filterData) {
            if ($filterData['enabled'] == true){
                $filter = $this->getFilter($alias);
                if (!in_array($filter->applyOn(), $usedTypes)) {
                    array_push($usedTypes, $filter->applyOn());
                }
            }
        }
        
        return $usedTypes;
    }