/**
* Get an instance of this class
*
* @access public
* @param PHPExcel $workbook Injected workbook for working with a PHPExcel object,
* or NULL to create a standalone claculation engine
* @return PHPExcel_Calculation
*/
public static function getInstance(PHPExcel $workbook = null)
{
if ($workbook !== null) {
$instance = $workbook->getCalculationEngine();
if (isset($instance)) {
return $instance;
}
}
if (!isset(self::$instance) || self::$instance === null) {
self::$instance = new PHPExcel_Calculation();
}
return self::$instance;
}
/**
* Get an instance of this class
*
* @access public
* @param PHPExcel $workbook Injected workbook for working with a PHPExcel object,
* or NULL to create a standalone claculation engine
* @return PHPExcel_Calculation
*/
public static function getInstance(PHPExcel $workbook = null)
{
if ($workbook !== null) {
if (isset(self::$workbookSets[$workbook->getID()])) {
return self::$workbookSets[$workbook->getID()];
}
return new PHPExcel_Calculation($workbook);
}
if (!isset(self::$instance) || self::$instance === null) {
self::$instance = new PHPExcel_Calculation();
}
return self::$instance;
}
