CellStyleCache cellStyleCache = new CellStyleCache(workbook, model.getProject());
for (short rowIndex = 0; rowIndex < model.getRowCount(); rowIndex++) {
HSSFRow row = sheet.createRow(rowIndex + 1);
for (int columnIndex = 0; columnIndex < model.getColumnCount(); columnIndex++){
HSSFCell cell = row.createCell(columnIndex);
Object value = model.getValue(rowIndex, columnIndex);
if (value != null) {
if (value instanceof Number) {
Number number = (Number) value;
double doubleValue = number.doubleValue();