protected org.zkoss.poi.ss.usermodel.Font getPoiFontFromRichText(
      Workbook book, Cell cell, RichTextString rstr, int run) {
    if (run < 0) return null; // ZSS-1138

    org.zkoss.poi.ss.usermodel.Font font =
        rstr instanceof HSSFRichTextString
            ? book.getFontAt(((HSSFRichTextString) rstr).getFontOfFormattingRun(run))
            : ((XSSFRichTextString) rstr).getFontOfFormattingRun((XSSFWorkbook) book, run);
    if (font == null) {
      CellStyle style = cell.getCellStyle();
      short fontIndex = style != null ? style.getFontIndex() : (short) 0;
      return book.getFontAt(fontIndex);
    }
    return font;
  }
  protected SCell importCell(Cell poiCell, int row, SSheet sheet) {

    SCell cell = sheet.getCell(row, poiCell.getColumnIndex());
    cell.setCellStyle(importCellStyle(poiCell.getCellStyle()));

    switch (poiCell.getCellType()) {
      case Cell.CELL_TYPE_NUMERIC:
        cell.setNumberValue(poiCell.getNumericCellValue());
        break;
      case Cell.CELL_TYPE_STRING:
        RichTextString poiRichTextString = poiCell.getRichStringCellValue();
        if (poiRichTextString != null && poiRichTextString.numFormattingRuns() > 0) {
          SRichText richText = cell.setupRichTextValue();
          importRichText(poiCell, poiRichTextString, richText);
        } else {
          cell.setStringValue(poiCell.getStringCellValue());
        }
        break;
      case Cell.CELL_TYPE_BOOLEAN:
        cell.setBooleanValue(poiCell.getBooleanCellValue());
        break;
      case Cell.CELL_TYPE_FORMULA:
        cell.setFormulaValue(poiCell.getCellFormula());
        // ZSS-873
        if (isImportCache() && !poiCell.isCalcOnLoad() && !mustCalc(cell)) {
          ValueEval val = null;
          switch (poiCell.getCachedFormulaResultType()) {
            case Cell.CELL_TYPE_NUMERIC:
              val = new NumberEval(poiCell.getNumericCellValue());
              break;
            case Cell.CELL_TYPE_STRING:
              RichTextString poiRichTextString0 = poiCell.getRichStringCellValue();
              if (poiRichTextString0 != null && poiRichTextString0.numFormattingRuns() > 0) {
                SRichText richText = new RichTextImpl();
                importRichText(poiCell, poiRichTextString0, richText);
                val = new StringEval(richText.getText());
              } else {
                val = new StringEval(poiCell.getStringCellValue());
              }
              break;
            case Cell.CELL_TYPE_BOOLEAN:
              val = BoolEval.valueOf(poiCell.getBooleanCellValue());
              break;
            case Cell.CELL_TYPE_ERROR:
              val = ErrorEval.valueOf(poiCell.getErrorCellValue());
              break;
            case Cell.CELL_TYPE_BLANK:
            default:
              // do nothing
          }
          if (val != null) {
            ((AbstractCellAdv) cell).setFormulaResultValue(val);
          }
        }
        break;
      case Cell.CELL_TYPE_ERROR:
        cell.setErrorValue(PoiEnumConversion.toErrorCode(poiCell.getErrorCellValue()));
        break;
      case Cell.CELL_TYPE_BLANK:
        // do nothing because spreadsheet model auto creates blank cells
      default:
        // TODO log: leave an unknown cell type as a blank cell.
        break;
    }

    Hyperlink poiHyperlink = poiCell.getHyperlink();
    if (poiHyperlink != null) {
      String addr = poiHyperlink.getAddress();
      String label = poiHyperlink.getLabel();
      SHyperlink hyperlink =
          cell.setupHyperlink(
              PoiEnumConversion.toHyperlinkType(poiHyperlink.getType()),
              addr == null ? "" : addr,
              label == null ? "" : label);
      cell.setHyperlink(hyperlink);
    }

    Comment poiComment = poiCell.getCellComment();
    if (poiComment != null) {
      SComment comment = cell.setupComment();
      comment.setAuthor(poiComment.getAuthor());
      comment.setVisible(poiComment.isVisible());
      RichTextString poiRichTextString = poiComment.getString();
      if (poiRichTextString != null && poiRichTextString.numFormattingRuns() > 0) {
        importRichText(poiCell, poiComment.getString(), comment.setupRichText());
      } else {
        comment.setText(poiComment.toString());
      }
    }

    return cell;
  }