Helper/Config.php
private function getPageFilter($filterName, $storeId = null)
    {
        $pageFilters = $this->getPageFilters($storeId);
        if ($pageFilters && @$pageFilters->$filterName) {
            return (array)$pageFilters->$filterName;
        }
        return [];
    }
private function getPageFilter($filterName, $storeId = null)
    {
        $pageFilters = $this->getPageFilters($storeId);
        if ($pageFilters && @$pageFilters->$filterName) {
            return (array)$pageFilters->$filterName;
        }
        return [];
    }
private function getPageFilter ( $ filterName , $ storeId = null ) { $ pageFilters = $ this -> getPageFilters ( $ storeId ) ; if ( $ pageFilters && @ $ pageFilters -> $ filterName ) { return ( array ) $ pageFilters -> $ filterName ; } return [ ] ; }
Get filter specified by name from "pageFilters" additional configuration

@param string $filterName   'whitelist'|'blacklist'
@param int|string $storeId
@return array
Get filter specified by name from pageFilters additional configuration