existPrevPage = startWithOffset > 0;
        existNextPage = startWithOffset < (long) (allPageCount - 1) * (long) pageSize;
        currentPageNumber = start / pageSize + 1;
        if (existNextPage && size() < pageSize) {
            // collapsing
            existNextPage = false;
            allPageCount = currentPageNumber;
        }

            RenderDataUtil.register(data, "allRecordCountRelation", allRecordCountRelation);
            RenderDataUtil.register(data, "allPageCount", allPageCount);
            RenderDataUtil.register(data, "existNextPage", existNextPage);
            RenderDataUtil.register(data, "existPrevPage", existPrevPage);
            RenderDataUtil.register(data, "currentStartRecordNumber", currentStartRecordNumber);

    public static final String GUEST_USER = "guest";

    public static final String[] PAGER_CONVERSION_RULE =
            { "allRecordCount", "pageSize", "currentPageNumber", "allPageCount", "existPrePage", "existNextPage" };

    // crawler types
    public static final String WEB_CRAWLER_TYPE = "web_crawling";

    public static final String FILE_CRAWLER_TYPE = "file_crawling";