private static ExcelVersion parseValidExcelVersions(int intVersion) {
    switch (intVersion) {
        case 9:
            return EXCEL_2000;
        case 10:
            return EXCEL_2002;
        case 11:
            return EXCEL_2003;
        case 12:
            return EXCEL_2007;
        default:
            if (intVersion < 9) {
                return VERY_OLD_VERSION;
            } else
                return NEW_VERSION;
            }
    }
}