public LruHashSet(final int limitSize) {
        map = new LruHashMap<>(limitSize);
    }

    /**
     * Returns an iterator over the elements in this set. The elements are
     * returned in no particular order.
     *
     * @return an Iterator over the elements in this set.
     * @see ConcurrentModificationException
     */
    @Override
    public Iterator<E> iterator() {

             * the header, only their body. But for whatever reason one might wish
             * to populate fields if the writeXxx operation needs this header data
             * for whatever reason. I copy over the uid here so it appears correct
             * in logging output. Logging of andx segments of messages inadvertantly
             * print header information because of the way toString always makes a

        if (list.isEmpty()) {
            return null;
        }
        if (list.size() >= 2) {
            String msg = "The size of selected list is over 1: " + list.size();
            throw new FetchingOverSafetySizeException(msg, 1); // immediately caught by caller and translated
        }
        return list.get(0);
    }

    @Override

                }

                if (emptyListCount >= maxEmptyListCount) {
                    if (logger.isInfoEnabled()) {
                        logger.info("Terminating indexUpdater. emptyListCount is over {}.", maxEmptyListCount);
                    }
                    // terminate crawling
                    finishCrawling = true;
                    forceStop();

        if (list.isEmpty()) {
            return null;
        }
        if (list.size() >= 2) {
            String msg = "The size of selected list is over 1: " + list.size();
            throw new FetchingOverSafetySizeException(msg, 1); // immediately caught by caller and translated
        }
        return list.get(0);
    }

    @Override

    public static final String LABELS_search_result_status_over = "{labels.search_result_status_over}";

    /** The key of the message: ({0} sec) */
    public static final String LABELS_search_result_time = "{labels.search_result_time}";

    /** The key of the message: Prev */

        if (list.isEmpty()) {
            return null;
        }
        if (list.size() >= 2) {
            String msg = "The size of selected list is over 1: " + list.size();
            throw new FetchingOverSafetySizeException(msg, 1); // immediately caught by caller and translated
        }
        return list.get(0);
    }

    @Override