* Valid URL characters include:
     * - Lowercase letters (a-z)
     * - Uppercase letters (A-Z)
     * - Digits (0-9)
     * - Special characters: . - * _ : / + % = & ? # [ ] @ ~ ! $ ' ( ) , ;
     *
     * @param c the character to check
     * @return {@code true} if the character is a valid URL character, {@code false} otherwise
     */
    public static boolean isUrlChar(final char c) {
        if (c >= 'a' && c <= 'z' //

        clientMap.put(Pattern.compile(regex), client);
    }

    /**
     * Adds a client with a regular expression pattern at a specific position.
     * @param regex The regular expression to match URLs.
     * @param client The CrawlerClient instance.
     * @param pos The position to add the client.
     */
    public void addClient(final String regex, final CrawlerClient client, final int pos) {

    }

    /**
     * Sets the maximum access count.
     * @param maxAccessCount The maximum access count.
     */
    public void setMaxAccessCount(final long maxAccessCount) {
        this.maxAccessCount = maxAccessCount;
    }

    /**
     * Adds sitemaps to the thread-local storage.
     * @param sitemaps An array of sitemap URLs.
     */
    public void addSitemaps(final String[] sitemaps) {

     *
     * @param useFilename true to use the filename for MIME type detection, false otherwise
     */
    public void setUseFilename(final boolean useFilename) {
        this.useFilename = useFilename;
    }

    /**
     * Sets whether to use the filename for MIME type detection when the stream is octet-stream.
     *

     */
    private ResponseDataUtil() {
    }

    /**
     * Creates a temporary file containing the response body from the given ResponseData.
     *
     * @param responseData the response data containing the response body
     * @return a temporary file containing the response body
     * @throws CrawlingAccessException if an error occurs while reading the response body
     */

    int NO_URL_IN_QUEUE = 4;

    /** Constant indicating that the crawler is waiting for new URLs. */
    int WAIT_NEW_URL = 8;

    /**
     * Introduces a delay based on the specified type.
     *
     * @param type the type of delay to be introduced
     */
    void delay(int type);

     */
    /**
     * Adds a rule to the end of the rule list.
     * @param rule the rule to add
     */
    @Override
    public void addRule(final Rule rule) {
        ruleList.add(rule);
    }

    /**
     * Adds a rule at the specified position in the rule list.
     * @param index the position to insert the rule
     * @param rule the rule to add
     */
    @Override

        return crawlerContext;
    }

    /**
     * Sets the number of threads.
     * @param numOfThread The number of threads.
     */
    public void setNumOfThread(final int numOfThread) {
        crawlerContext.numOfThread = numOfThread;
    }

    /**
     * Sets the maximum thread check count.
     * @param maxThreadCheckCount The maximum thread check count.
     */

     * Constructs a new BinaryTransformer.
     */
    public BinaryTransformer() {
        // NOP
    }

    /**
     * Transforms the given ResponseData into a ResultData containing binary content.
     * @param responseData The response data to be transformed.
     * @return The transformed ResultData.
     */
    @Override
    public ResultData transform(final ResponseData responseData) {

        // Default constructor
    }

    /**
     * Checks if access to a given path is allowed for a specific user agent according to robots.txt rules.
     *
     * @param path The path to check for access permission
     * @param userAgent The user agent string to check against robots.txt directives
     * @return true if access is allowed, false if access is disallowed by robots.txt rules.