private RESPONSE response = null;

    private Throwable error = null;

    private final Promise promise = new Promise();

    private final Queue<Consumer<RESPONSE>> doneCallbacks = new LinkedBlockingQueue<>();

    private final Queue<Consumer<Throwable>> errorCallbacks = new LinkedBlockingQueue<>();

    private final CountDownLatch latch = new CountDownLatch(1);

    /**

     *            the object to add
     * @return a new array with the object appended
     */
    public static <T> T[] add(final T[] array, final T obj) {
        assertArgumentNotNull("array", array);

        final int length = array.length;
        @SuppressWarnings("unchecked")
        final T[] newArray = (T[]) Array.newInstance(array.getClass().getComponentType(), length + 1);

    protected static final Class<?> suppressUnusedImportLocalDateTime = LocalDateTime.class;

    // ===================================================================================
    //                                                                           Singleton
    //                                                                           =========
    private static final BadWordDbm _instance = new BadWordDbm();

    protected static final Class<?> suppressUnusedImportLocalDateTime = LocalDateTime.class;

    // ===================================================================================
    //                                                                           Singleton
    //                                                                           =========

     * @return the extractor instance for processing the document
     * @throws FessSystemException if no suitable extractor can be found
     */
    @Override
    protected Extractor getExtractor(final ResponseData responseData) {
        final ExtractorFactory extractorFactory = ComponentUtil.getExtractorFactory();
        if (extractorFactory == null) {
            throw new FessSystemException("Could not find extractorFactory.");
        }

     * @return optional file configuration entity
     */
    public static OptionalEntity<FileConfig> getFileConfig(final CreateForm form) {
        final SystemHelper systemHelper = ComponentUtil.getSystemHelper();
        final String username = systemHelper.getUsername();
        final long currentTime = systemHelper.getCurrentTimeAsLong();
        return getEntity(form, username, currentTime).map(entity -> {

     * @return the converted {@link Date}
     */
    protected static Date toDate(final String str, final DateFormat format) {
        final ParsePosition pos = new ParsePosition(0);
        final Date date = format.parse(str, pos);
        if (date == null) {
            return null;
        }
        final int index = pos.getIndex();
        if (index == 0) {
            return null;
        }

    @Execute
    public StreamResponse get$file(final String id) {
        final FessConfig fessConfig = ComponentUtil.getFessConfig();
        if (stream(fessConfig.getIndexBackupAllTargets()).get(stream -> stream.anyMatch(s -> s.equals(id)))) {
            if ("system.properties".equals(id)) {
                return asStream(id).contentTypeOctetStream().stream(out -> {
                    try (final ByteArrayOutputStream baos = new ByteArrayOutputStream()) {

        final BufferedInputStream bis = new BufferedInputStream(in);
        final String encoding = xmlExtractor.getEncoding(bis);
        CloseableUtil.closeQuietly(bis);
        assertEquals("UTF-8", encoding);
    }

    public void test_getEncoding_sjis() {
        final InputStream in = ResourceUtil.getResourceAsStream("extractor/test_sjis.xml");
        final BufferedInputStream bis = new BufferedInputStream(in);

            maximum_length = (short) _src.dec_ndr_short();
            final int _bufferp = _src.dec_ndr_long();

            if (_bufferp != 0) {
                _src = _src.deferred;
                final int _buffers = _src.dec_ndr_long();
                _src.dec_ndr_long();
                final int _bufferl = _src.dec_ndr_long();
                final int _bufferi = _src.index;
                _src.advance(2 * _bufferl);