}
private static ChangeInfo insertXSSFRows(Worksheet sheet, int startRow, int num, int copyOrigin) {
final Book book = (Book) sheet.getWorkbook();
final RefSheet refSheet = getRefSheet(book, sheet);
final Set<Ref>[] refs = refSheet.insertRows(startRow, num);
final int lastRowNum = sheet.getLastRowNum();
if (startRow > lastRowNum) {
return null;
}
final List<CellRangeAddress[]> shiftedRanges = ((XSSFSheetImpl)sheet).shiftRowsOnly(startRow, lastRowNum, num, true, false, true, false, copyOrigin);