return "gidNumber";
        }

        @Override
        public String getLdapAttrUidNumber() {
            return "uidNumber";
        }

        @Override
        public String getLdapAttrDepartmentNumber() {
            return "departmentNumber";
        }

        @Override
        public String getLdapAttrPreferredLanguage() {
            return "preferredLanguage";
        }

                setAttributeValue(result, fessConfig.getLdapAttrPreferredLanguage(), o -> user.setPreferredLanguage(o.toString()));
                setAttributeValue(result, fessConfig.getLdapAttrDepartmentNumber(), o -> user.setDepartmentNumber(o.toString()));
                setAttributeValue(result, fessConfig.getLdapAttrUidNumber(), o -> user.setUidNumber(DfTypeUtil.toLong(o)));

            return "gidNumber";
        }

        @Override
        public String getLdapAttrUidNumber() {
            return "uidNumber";
        }

        @Override
        public String getLdapAttrDepartmentNumber() {
            return "departmentNumber";
        }

        @Override
        public String getLdapAttrPreferredLanguage() {
            return "preferredLanguage";
        }

     * comment: LDAP attribute for department number.
     * @return The value of found property. (NotNull: if not found, exception but basically no way)
     */
    String getLdapAttrDepartmentNumber();

    /**
     * Get the value for the key 'ldap.attr.uidNumber'. <br>
     * The value is, e.g. uidNumber <br>
     * comment: LDAP attribute for UID number.