throw new CrawlerSystemException("CrawlerClient is null.");
        }
        int current = 0;
        boolean added = false;
        final Map<Pattern, CrawlerClient> newClientMap = new LinkedHashMap<>();
        for (final Map.Entry<Pattern, CrawlerClient> entry : clientMap.entrySet()) {
            if (pos == current) {
                newClientMap.put(Pattern.compile(regex), client);
                added = true;

        assertContentType("application/zip", "extractor/zip/test.zip", "hoge.zip");
        assertContentType("application/x-lharc", "extractor/lha/test.lzh", "hoge.lzh"); // TODO is it correct?

        assertContentType("application/xml", "extractor/test.mm", "hoge.mm");

        assertContentType("message/rfc822", "extractor/eml/sample1.eml", "sample1.eml");

    /**
     * Constructs a new FileTransformer.
     */
    public FileTransformer() {
        // Default constructor
    }

    /**
     * A path to store downloaded files. The default path is a current
     * directory.
     */
    protected String path;

    /**
     * A string to replace ?.
     */
    protected String questionStr = "_QUEST_";

    /**
     * A string to replace :.
     */

    /**
     * Sets the encoding for the URL queue.
     *
     * @param encoding the encoding to be set
     */
    void setEncoding(String encoding);

    /**
     * Retrieves the parent URL of the current URL in the queue.
     *
     * @return the parent URL as a String.
     */
    String getParentUrl();

    /**
     * Sets the parent URL for this URL queue entry.
     *

        /**
         * Called before each request attempt.
         *
         * @param client the fault-tolerant client
         * @param request the request data
         * @param count the current retry count
         */
        void onRequest(FaultTolerantClient client, RequestData request, int count);

        /**
         * Called when a request ends.
         *

    /** The metadata associated with the URL queue. */
    protected String metaData;

    /** The encoding of the URL queue. */
    protected String encoding;

    /** The parent URL of the current URL in the queue. */
    protected String parentUrl;

    /** The depth of the URL in the queue. */
    protected Integer depth;

    /** The last modified timestamp of the URL in the queue. */

        }
        urlFilter.processUrl(url);
    }

    /**
     * Returns the current session ID.
     * @return The session ID.
     */
    public String getSessionId() {
        return crawlerContext.sessionId;
    }

    /**
     * Sets the session ID.
     * If the new session ID is different from the current one, it updates the session ID in the URL queue service.
     * @param sessionId The new session ID.

        assertEquals("0xFF", tokens.get(2).getTerm());
        assertEquals("3", tokens.get(3).getTerm());
    }

    @Test
    public void testAnalyzeTokenPositions() {
        // Test that token positions are correct
        String text = "one two three";
        String field = "content";
        String lang = "en";

        List<AnalyzeToken> tokens = analyzer.analyze(text, field, lang);

        assertNotNull(tokens);

     */
    public CrawlerContext() {
        // Default constructor
    }

    /**
     * Session identifier for the crawling session.
     */
    protected String sessionId;

    /**
     * Current number of active crawler threads.
     */
    protected Integer activeThreadCount = 0;

    /**
     * Lock object for synchronizing access to active thread count.
     */

     *
     * @return a hash code value for this object
     */
    @Override
    public int hashCode() {
        return inputStream.hashCode();
    }

    /**
     * Marks the current position in this input stream.
     *
     * @param readlimit the maximum limit of bytes that can be read before the mark position becomes invalid
     */
    @Override
    public synchronized void mark(final int readlimit) {