return roles;
    }

    protected void processSubRoles(final LdapUser ldapUser, final String bindDn, final Set<String> subRoleSet, final String groupFilter,
            final Set<String> roleSet) {
        // (member:1.2.840.113556.1.4.1941:=%s)
        if (subRoleSet.isEmpty()) {
            return;
        }
        String filter = subRoleSet.stream().map(s -> String.format(groupFilter, s)).collect(Collectors.joining());