private function driverClass()
    {
        if (null == $this->driverClass) {
            $this->driverClass = $this->determineDriver($this->file);
        }
        return $this->driverClass;
    }
private function driverClass()
    {
        if (null == $this->driverClass) {
            $this->driverClass = $this->determineDriver($this->file);
        }
        return $this->driverClass;
    }
private function driverClass ( ) { if ( null == $ this -> driverClass ) { $ this -> driverClass = $ this -> determineDriver ( $ this -> file ) ; } return $ this -> driverClass ; }
Returns the driver class to be initialized

@return mixed|null|string
Returns the driver class to be initialized