this.id = id;
    }

    /**
     * Returns an empty map with default values for suggest item fields.
     * @return An empty map.
     */
    public Map<String, Object> toEmptyMap() {
        return emptySource;
    }

    /**
     * Creates an empty map with default values for suggest item fields.
     * @return An empty map.
     */

    public static final String FTP_AUTHENTICATIONS_PROPERTY = "ftpAuthentications";

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

    /** Character encoding for FTP operations */
    protected String charset = Constants.UTF_8;

    /** Helper for managing content length limits */
    @Resource

        case INITIALIZING:
            return "Crawler is initializing";
        case RUNNING:
            return "Crawler is running";
        case DONE:
            return "Crawler has completed";
        default:
            fail("Unexpected status: " + status);
            return null;
        }
    }

    /**
     * Test state transitions (typical workflow)
     */
    public void test_stateTransitions() {

    /** Logger instance for this class. */
    private static final Logger logger = LogManager.getLogger(PdfExtractor.class);

    /** Timeout for PDF extraction in milliseconds (default: 30 seconds). */
    protected long timeout = 30000; // 30sec

    /** Whether the extraction thread should be a daemon thread. */
    protected boolean isDaemonThread = false;

    /**

                        // Simulate Japanese reading conversion
                        testToken.setReading(convertToJapaneseReading(testToken.getTerm()));
                    } else {
                        // Default: uppercase for reading
                        testToken.setReading(testToken.getTerm().toUpperCase());
                    }
                }
            }

            return tokens;
        }

     */
    protected static class QueueHolder {
        /**
         * Constructs a new QueueHolder.
         */
        public QueueHolder() {
            // Default constructor
        }

        /**
         * The queue for URLs waiting to be crawled.
         */
        protected Queue<OpenSearchUrlQueue> waitingQueue = new ConcurrentLinkedQueue<>();

        /**

        FtpServerFactory factory = new FtpServerFactory();
        ListenerFactory lisnerFactory = new ListenerFactory();
        lisnerFactory.setPort(port);
        factory.addListener("default", lisnerFactory.createListener());

        if (username != null) {
            UserManager userManager = factory.getUserManager();
            BaseUser ftpUser = new BaseUser();
            ftpUser.setName(username);

        assertEquals(0, item.getFields().length);
        assertNotNull(item.getTags());
        assertEquals(0, item.getTags().length);
        assertNotNull(item.getRoles());
        assertEquals(1, item.getRoles().length); // Default role is added
        assertNotNull(item.getLanguages());
        assertEquals(0, item.getLanguages().length);
        assertNotNull(item.getKinds());
        assertEquals(1, item.getKinds().length);

     */
    public void test_match_implementation() {
        ResponseData responseData = new ResponseData();
        responseData.setUrl("http://example.com");

        // Test default match (true)
        assertTrue(testRule.match(responseData));
        assertEquals(1, testRule.getMatchCallCount());
        assertSame(responseData, testRule.getLastResponseData());

        // Change match result

 * </p>
 *
 */
public class CrawlerThread implements Runnable {
    /**
     * Constructs a new CrawlerThread.
     */
    public CrawlerThread() {
        // Default constructor
    }

    /**
     * Service for managing URL queues during crawling.
     */
    @Resource
    protected UrlQueueService<UrlQueue<?>> urlQueueService;

    /**