*
     * @param attrs
     *            属性。{@literal null}であってはいけません
     * @param buf
     *            文字列バッファ。{@literal null}であってはいけません
     */
    public static void appendAttrs(final NamedNodeMap attrs, final StringBuilder buf) {
        assertArgumentNotNull("attrs", attrs);
        assertArgumentNotNull("buf", buf);

        final int length = attrs.getLength();

        for (final SearchResult srcrslt : result) {
            final Attributes attrs = srcrslt.getAttributes();

            //get group attr
            final Attribute attr = attrs.get(fessConfig.getLdapMemberofAttribute());
            if (attr == null) {
                continue;
            }

        }

        @Override
        public FileVisitResult preVisitDirectory(final Path dir, final BasicFileAttributes attrs) throws IOException {
            return FileVisitResult.CONTINUE;
        }

        @Override
        public FileVisitResult visitFile(final Path file, final BasicFileAttributes attrs) throws IOException {