if (type == SID.SID_TYPE_DOM_GRP || type == SID.SID_TYPE_ALIAS) {
            try {
                final SID[] children = sid.getGroupMemberSids(file.getServer(), (NtlmPasswordAuthentication) file.getPrincipal(),
                        SID.SID_FLAG_RESOLVE_SIDS);
                for (final SID child : children) {
                    if (!sidSet.contains(child)) {
                        processAllowedSIDs(file, child, sidSet);

 * username for example:
 * <tt>
 * String username = f.getPrincipal().getName();
 * </tt>
 * The <tt>Principal</tt> object returned will never be <tt>null</tt>
 * however the username can be <tt>null</tt> indication anonymous
 * credentials were used (e.g. some IPC$ services).
 */

    public Principal getPrincipal() {
        return auth;
    }

/**

                .lookupPrincipalByName(getUsername());
        ImmutableList<AclEntry> acl =
            ImmutableList.of(
                AclEntry.newBuilder()
                    .setType(ALLOW)
                    .setPrincipal(user)
                    .setPermissions(EnumSet.allOf(AclEntryPermission.class))
                    .setFlags(DIRECTORY_INHERIT, FILE_INHERIT)
                    .build());