docs: public ExcelExtractor getExtractor() {
  		ExcelExtractor extractor;
  		Workbook wb = this.workbook;
  		if (wb instanceof HSSFWorkbook) {
  			extractor = new org.apache.poi.hssf.extractor.ExcelExtractor((HSSFWorkbook) wb);
  		} else {
  			extractor = new XSSFExcelExtractor((XSSFWorkbook) wb);
  		}
  		return extractor;
  	}