return gidNumber;
    }

    public void setGidNumber(Long value) {
        registerModifiedProperty("gidNumber");
        this.gidNumber = value;
    }

    public String getGivenName() {
        checkSpecifiedProperty("givenName");
        return convertEmptyToNull(givenName);
    }

    public void setGivenName(String value) {
        registerModifiedProperty("givenName");

        setupEpg(_epgMap, et -> ((User) et).getGidNumber(), (et, vl) -> ((User) et).setGidNumber(DfTypeUtil.toLong(vl)), "gidNumber");
        setupEpg(_epgMap, et -> ((User) et).getGivenName(), (et, vl) -> ((User) et).setGivenName(DfTypeUtil.toString(vl)), "givenName");
        setupEpg(_epgMap, et -> ((User) et).getGroups(), (et, vl) -> ((User) et).setGroups((String[]) vl), "groups");

                        .forEach(v -> modifyDeleteEntry(modifyList, attrSurname, v)));
        final String attrGivenName = fessConfig.getLdapAttrGivenName();
        OptionalUtil.ofNullable(user.getGivenName())
                .filter(StringUtil::isNotBlank)
                .ifPresent(s -> modifyReplaceEntry(modifyList, attrGivenName, s))
                .orElse(() -> getAttributeValueList(result, attrGivenName).stream()