public function add_data($row) {
        if(!isset($this->path)) {
            $this->set_temp_file_path();
            $this->fp = fopen($this->path, 'w+');
        }
        $delimiter = csv_import_reader::get_delimiter($this->delimiter);
        fputcsv($this->fp, $row, $delimiter, $this->csvenclosure);
    }