/**
  * Returns a string representation of the cell
  *
  * <p>Formula cells return the formula string, rather than the formula result. Dates are displayed
  * in dd-MMM-yyyy format Errors are displayed as #ERR&lt;errIdx&gt;
  */
 public String toString() {
   switch (getCellType()) {
     case CELL_TYPE_BLANK:
       return "";
     case CELL_TYPE_BOOLEAN:
       return getBooleanCellValue() ? "TRUE" : "FALSE";
     case CELL_TYPE_ERROR:
       return ErrorEval.getText(getErrorCellValue());
     case CELL_TYPE_FORMULA:
       return getCellFormula();
     case CELL_TYPE_NUMERIC:
       if (DateUtil.isCellDateFormatted(this)) {
         DateFormat sdf = new SimpleDateFormat("dd-MMM-yyyy");
         return sdf.format(getDateCellValue());
       }
       return getNumericCellValue() + "";
     case CELL_TYPE_STRING:
       return getRichStringCellValue().toString();
     default:
       return "Unknown Cell Type: " + getCellType();
   }
 }
  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;
  }