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

        }

        public int getAllPageCount() {
            return allPageCount;
        }

        public boolean isExistPrePage() {
            return currentPageNumber != 1;
        }

        public boolean isExistNextPage() {
            return currentPageNumber != allPageCount;
        }

        public void setPageRangeSize(final int pageRangeSize) {

            final String allRecordCount = Long.toString(data.getAllRecordCount());
            final String allRecordCountRelation = data.getAllRecordCountRelation();
            final String allPageCount = Integer.toString(data.getAllPageCount());
            final List<Map<String, Object>> documentItems = data.getDocumentItems();
            final FacetResponse facetResponse = data.getFacetResponse();

    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";