public function getSorter()
    {
        if (null === $this->sorter) {
            $this->sorter = new Sorter($this);
        }
        return $this->sorter;
    }
public function getSorter()
    {
        if (null === $this->sorter) {
            $this->sorter = new Sorter($this);
        }
        return $this->sorter;
    }
public function getSorter ( ) { if ( null === $ this -> sorter ) { $ this -> sorter = new Sorter ( $ this ) ; } return $ this -> sorter ; }
Returns data sorting manager.

@return Sorter
Returns data sorting manager .