private function mapHAlign($hAlign)
    {
        switch ($hAlign) {
            case Alignment::HORIZONTAL_GENERAL:
                return false;
            case Alignment::HORIZONTAL_LEFT:
                return 'left';
            case Alignment::HORIZONTAL_RIGHT:
                return 'right';
            case Alignment::HORIZONTAL_CENTER:
            case Alignment::HORIZONTAL_CENTER_CONTINUOUS:
                return 'center';
            case Alignment::HORIZONTAL_JUSTIFY:
                return 'justify';
            default:
                return false;
        }
    }