assertEquals("a,b,c=>output", item.toLineString());
    }

    public void test_toLineString_withUpdates() {
        String[] inputs = { "old1", "old2" };
        CharMappingItem item = new CharMappingItem(1L, inputs, "oldOutput");

        item.setNewInputs(new String[] { "new1", "new2", "new3" });
        item.setNewOutput("newOutput");

 *   <li>Old document deletion after successful crawling</li>
 *   <li>Crawling execution monitoring and timing</li>
 * </ul>
 */
public class DataIndexHelper {

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

    /** Parameter key for controlling deletion of old documents */

    }

    /**
     * Deletes old documents that have the same URL but different document IDs
     * as the documents in the provided list. This prevents duplicate documents
     * from accumulating in the index.
     *
     * @param searchEngineClient the search engine client to use for deletion
     * @param docList the list of new documents to check against
     * @return the number of old documents that were deleted
     */

  }

  /**
   * Increments by one the value currently associated with {@code key}, and returns the old value.
   */
  @CanIgnoreReturnValue
  public long getAndIncrement(K key) {
    return getAndAdd(key, 1);
  }

  /**
   * Decrements by one the value currently associated with {@code key}, and returns the old value.
   */
  @CanIgnoreReturnValue
  public long getAndDecrement(K key) {

labels.popular_word_word_enabled=Popular Word Response
labels.supported_search_web=Web
labels.supported_search_none=Unavailable
labels.purge_search_log_day=Delete old search logs
labels.purge_job_log_day=Delete old job logs
labels.purge_user_info_day=Delete old user logs
labels.purge_by_bots=Bot names to delete logs
labels.log_level=Log Level
labels.csv_file_encoding=CSV File Encoding
labels.notification_to=Notification Mail

      limiter.acquire(); // #3
    }

    limiter.setRate(4.0); // double the rate!
    limiter.acquire(); // #4, we repay the debt of the last acquire (imposed by the old rate)
    for (int i = 0; i < 4; i++) {
      limiter.acquire(); // #5
    }
    stopwatch.sleepMillis(4250); // #6, back to cold state (warmup period + repay last acquire)
    for (int i = 0; i < 11; i++) {

      limiter.acquire(); // #3
    }

    limiter.setRate(4.0); // double the rate!
    limiter.acquire(); // #4, we repay the debt of the last acquire (imposed by the old rate)
    for (int i = 0; i < 4; i++) {
      limiter.acquire(); // #5
    }
    stopwatch.sleepMillis(4250); // #6, back to cold state (warmup period + repay last acquire)
    for (int i = 0; i < 11; i++) {

      synchronized (future) {
        Listener old = future.listenersField;
        if (old != update) {
          future.listenersField = update;
        }
        return old;
      }
    }

    @Override
    @Nullable Waiter gasWaiters(AbstractFutureState<?> future, Waiter update) {
      synchronized (future) {
        Waiter old = future.waitersField;
        if (old != update) {

            }
            item = newItem;
        }

        /**
         * Writes the old item to the new file.
         *
         * @param oldItem The old item.
         * @return The new item if it was updated, otherwise the old item.
         */
        public KuromojiItem write(final KuromojiItem oldItem) {
            try {

      synchronized (future) {
        Listener old = future.listenersField;
        if (old != update) {
          future.listenersField = update;
        }
        return old;
      }
    }

    @Override
    @Nullable Waiter gasWaiters(AbstractFutureState<?> future, Waiter update) {
      synchronized (future) {
        Waiter old = future.waitersField;
        if (old != update) {