* encoding for URL decoding.</p>
 *
 * <p>Example usage:</p>
 * <pre>
 * {@code
 * IdnDnsResolver resolver = new IdnDnsResolver();
 * resolver.setFlag(IDN.ALLOW_UNASSIGNED);
 * resolver.setEncoding("UTF-8");
 * InetAddress[] addresses = resolver.resolve("example.com");
 * }
 * </pre>
 *
 */
public class IdnDnsResolver implements DnsResolver {

    /** Flag for IDN conversion. */

     * Constructs a new request.
     */
    public Request() {
        // nothing
    }

    /**
     * Executes the request.
     * @param client The OpenSearch client.
     * @return A Promise that will be resolved with the response or rejected with an error.
     */
    public Deferred<T>.Promise execute(final Client client) {
        final String error = getValidationError();
        if (!Strings.isNullOrEmpty(error)) {

    /**
     * Returns whether SIDs (Security Identifiers) should be resolved.
     *
     * @return true if SIDs should be resolved, false otherwise
     */
    public boolean isResolveSids() {
        return resolveSids;
    }

    /**
     * Sets whether SIDs (Security Identifiers) should be resolved.
     *
     * @param resolveSids true to resolve SIDs, false otherwise
     */

    private final CountDownLatch latch = new CountDownLatch(1);

    /**
     * Resolves the deferred computation with the given response.
     * @param r The response.
     */
    public void resolve(final RESPONSE r) {
        final ArrayList<Consumer<RESPONSE>> executeCallbacks;
        synchronized (Deferred.this) {

    public void test_toAscii() {
        IdnDnsResolver resolver = new IdnDnsResolver();

        String host = "www.codelibs.org";
        String expected = "www.codelibs.org";
        assertEquals(expected, resolver.toAscii(host));

        host = "テスト.org";
        expected = "xn--zckzah.org";
        assertEquals(expected, resolver.toAscii(host));

        host = "xn--zckzah.org";

        Path dir1 = usersDir.resolve("dir1");
        Files.createDirectory(dir1);
        Files.writeString(dir1.resolve("file2.txt"), "file2");
        Path dir2 = dir1.resolve("dir2");
        Files.createDirectory(dir2);
        Files.writeString(dir2.resolve("file3.txt"), "file3");
        Path dir3 = usersDir.resolve("dir3");
        Files.createDirectory(dir3);

        Thread th = new Thread(() -> {
            try {
                Thread.sleep(1000);
            } catch (InterruptedException ignore) {}
            deferred.resolve(new SuggestResponse("", 0, Collections.emptyList(), 0, null));
        });
        th.start();

        final CountDownLatch latch = new CountDownLatch(1);
        deferred.promise().then(response -> latch.countDown());

    }

    /**
     * Returns whether SIDs (Security Identifiers) should be resolved.
     * @return true if SIDs should be resolved, false otherwise
     */
    public boolean isResolveSids() {
        return resolveSids;
    }

    /**
     * Sets whether SIDs (Security Identifiers) should be resolved.
     * @param resolveSids true to resolve SIDs, false otherwise
     */

            throw new CrawlerSystemException("Failed to create XPath instance.", e);
        }
    }

    /**
     *  Use an XPath string to select a nodelist.
     *  XPath namespace prefixes are resolved from the contextNode.
     *
     *  @param contextNode The node to start searching from.
     *  @param expression A valid XPath string.
     *  @return A XPathNodes, should never be null.
     *

    public RequestBuilder(final Client client, final Req request) {
        this.client = client;
        this.request = request;
    }

    /**
     * Executes the request.
     * @return A Promise that will be resolved with the response or rejected with an error.
     */
    public Deferred<Res>.Promise execute() {
        return request.execute(client);
    }