public function setHyperlink($pCellCoordinate, Hyperlink $pHyperlink = null)
    {
        if ($pHyperlink === null) {
            unset($this->hyperlinkCollection[$pCellCoordinate]);
        } else {
            $this->hyperlinkCollection[$pCellCoordinate] = $pHyperlink;
        }

        return $this;
    }