private Object evaluateCellFormula(final HSSFWorkbook workbook, final Cell cell) {
    FormulaEvaluator evaluator = workbook.getCreationHelper().createFormulaEvaluator();
    CellValue cellValue = evaluator.evaluate(cell);
    Object result = null;

    if (cellValue.getCellType() == Cell.CELL_TYPE_BOOLEAN) {
      result = cellValue.getBooleanValue();
    } else if (cellValue.getCellType() == Cell.CELL_TYPE_NUMERIC) {
      result = cellValue.getNumberValue();
    } else if (cellValue.getCellType() == Cell.CELL_TYPE_STRING) {
      result = cellValue.getStringValue();
    }

    return result;
  }
  private Collection<Object[]> loadFromSpreadsheet(final InputStream excelFile) throws IOException {
    HSSFWorkbook workbook = new HSSFWorkbook(excelFile);

    data = new ArrayList<Object[]>();
    Sheet sheet = workbook.getSheetAt(0);

    int numberOfColumns = countNonEmptyColumns(sheet);
    List<Object[]> rows = new ArrayList<Object[]>();
    List<Object> rowData = new ArrayList<Object>();

    for (Row row : sheet) {
      if (isEmpty(row)) {
        break;
      } else {
        rowData.clear();
        for (int column = 0; column < numberOfColumns; column++) {
          Cell cell = row.getCell(column);
          rowData.add(objectFrom(workbook, cell));
        }
        rows.add(rowData.toArray());
      }
    }
    return rows;
  }
  /**
   * Gets the tableCellEditorComponent attribute of the SVTableCellEditor object
   *
   * @return The tableCellEditorComponent value
   */
  public Component getTableCellEditorComponent(
      JTable table, Object value, boolean isSelected, int row, int column) {
    System.out.println("GetTableCellEditorComponent");
    HSSFCell cell = (HSSFCell) value;
    if (cell != null) {
      HSSFCellStyle style = cell.getCellStyle();
      HSSFFont f = wb.getFontAt(style.getFontIndex());
      boolean isbold = f.getBoldweight() > HSSFFont.BOLDWEIGHT_NORMAL;
      boolean isitalics = f.getItalic();

      int fontstyle = Font.PLAIN;

      if (isbold) fontstyle = Font.BOLD;
      if (isitalics) fontstyle = fontstyle | Font.ITALIC;

      int fontheight = f.getFontHeightInPoints();
      if (fontheight == 9) fontheight = 10; // fix for stupid ol Windows

      Font font = new Font(f.getFontName(), fontstyle, fontheight);
      editor.setFont(font);

      if (style.getFillPattern() == HSSFCellStyle.SOLID_FOREGROUND) {
        editor.setBackground(getAWTColor(style.getFillForegroundColor(), white));
      } else editor.setBackground(white);

      editor.setForeground(getAWTColor(f.getColor(), black));

      // Set the value that is rendered for the cell
      switch (cell.getCellType()) {
        case HSSFCell.CELL_TYPE_BLANK:
          editor.setText("");
          break;
        case HSSFCell.CELL_TYPE_BOOLEAN:
          if (cell.getBooleanCellValue()) {
            editor.setText("true");
          } else {
            editor.setText("false");
          }
          break;
        case HSSFCell.CELL_TYPE_NUMERIC:
          editor.setText(Double.toString(cell.getNumericCellValue()));
          break;
        case HSSFCell.CELL_TYPE_STRING:
          editor.setText(cell.getRichStringCellValue().getString());
          break;
        case HSSFCell.CELL_TYPE_FORMULA:
        default:
          editor.setText("?");
      }
      switch (style.getAlignment()) {
        case HSSFCellStyle.ALIGN_LEFT:
        case HSSFCellStyle.ALIGN_JUSTIFY:
        case HSSFCellStyle.ALIGN_FILL:
          editor.setHorizontalAlignment(SwingConstants.LEFT);
          break;
        case HSSFCellStyle.ALIGN_CENTER:
        case HSSFCellStyle.ALIGN_CENTER_SELECTION:
          editor.setHorizontalAlignment(SwingConstants.CENTER);
          break;
        case HSSFCellStyle.ALIGN_GENERAL:
        case HSSFCellStyle.ALIGN_RIGHT:
          editor.setHorizontalAlignment(SwingConstants.RIGHT);
          break;
        default:
          editor.setHorizontalAlignment(SwingConstants.LEFT);
          break;
      }
    }
    return editor;
  }