final ClassLoader cl1 = new URLClassLoader(new URL[] { new URL("file:/foo") }, null);
        final ClassLoader cl2 = new URLClassLoader(new URL[] { new URL("file:/bar") }, cl1);
        final ClassLoader cl3 = new URLClassLoader(new URL[] { new URL("file:/baz") }, cl2);

        assertThat(ClassLoaderUtil.isAncestor(cl3, cl2), is(true));
        assertThat(ClassLoaderUtil.isAncestor(cl3, cl1), is(true));

    }

    /**
     * Returns the URL.
     * @return The URL.
     */
    public String getUrl() {
        return url;
    }

    /**
     * Sets the URL.
     * @param url The URL.
     */
    public void setUrl(final String url) {
        this.url = url;
    }

    /**
     * Converts this URL filter to XContent format for OpenSearch indexing.
     *

     *
     * @param url
     *            The URL. Must not be {@literal null}.
     * @return A {@link URLConnection} object to the URL.
     */
    public static URLConnection openConnection(final URL url) {
        assertArgumentNotNull("url", url);

        try {
            final URLConnection connection = url.openConnection();
            connection.setUseCaches(false);

     * @param url the URL to get click count for
     * @param clickCountField the field name to store click count
     */
    protected void addClickCountField(final Map<String, Object> doc, final String url, final String clickCountField) {
        final SearchLogHelper searchLogHelper = ComponentUtil.getSearchLogHelper();
        final int count = searchLogHelper.getClickCount(url);
        doc.put(clickCountField, count);

        return DEFAULT_HTTP_PORT;
    }

    @Override
    protected URLConnection openConnection(URL url) throws IOException {
        url = new URL(url, url.toExternalForm(), getDefaultStreamHandler(url.getProtocol()));
        return new NtlmHttpURLConnection((HttpURLConnection) url.openConnection());
    }

    private static URLStreamHandler getDefaultStreamHandler(final String protocol) throws IOException {

    protected static final String OIC_SCOPE = "oic.scope";

    /** Configuration key for OpenID Connect redirect URL. */
    protected static final String OIC_REDIRECT_URL = "oic.redirect.url";

    /** Configuration key for OpenID Connect token server URL. */
    protected static final String OIC_TOKEN_SERVER_URL = "oic.token.server.url";

    /** Configuration key for OpenID Connect client secret. */

     *     at java.net.URL.<init>(URL.java:480)
     *     at java.net.URL.<init>(URL.java:376)
     *     at java.net.URL.<init>(URL.java:330)
     *     at jcifs.smb.SmbFile.<init>(SmbFile.java:355)
     *     ...
     * </pre>
     *
     * </blockquote>
     *
     */
    public static void registerSmbURLHandler() {
        SingletonContext.getInstance();

			<param name="plugin.groupId" value="org/codelibs/opensearch" />
			<param name="plugin.name.prefix" value="opensearch-" />
			<param name="plugin.name" value="configsync" />
			<param name="plugin.version" value="3.4.0" />
			<param name="plugin.zip.version" value="3.4.0" />
		</antcall>
		<!-- minhash -->
		<antcall target="install.plugin">
			<param name="repo.url" value="${maven.release.repo.url}" />

            }
        }
    }

    /**
     * Gets the appropriate crawler client for the given URL.
     * @param url The URL to get a client for.
     * @return The crawler client.
     */
    protected CrawlerClient getClient(final String url) {
        return clientFactory.getClient(url);
    }

    /**
     * Checks if the content has been updated since the last crawl.

        super(url, auth);
        this.pipeType = pipeType;
        type = TYPE_NAMED_PIPE;
    }

    /**
     * Constructs an SmbNamedPipe from a URL object.
     *
     * @param url the URL object representing the named pipe
     * @param pipeType the type of the pipe
     * @param auth the authentication credentials to use
     * @throws MalformedURLException if the URL is not properly formatted