public function getFilterCollection(): FilterCollection
    {
        if ($this->filters === null) {
            $this->filters = new FilterCollection();
        }
        return $this->filters;
    }
public function getFilterCollection(): FilterCollection
    {
        if ($this->filters === null) {
            $this->filters = new FilterCollection();
        }
        return $this->filters;
    }
public function getFilterCollection ( ) : FilterCollection { if ( $ this -> filters === null ) { $ this -> filters = new FilterCollection ( ) ; } return $ this -> filters ; }
Get the filter collection

@return  FilterCollection
Get the filter collection