this.existNextPage = existNextPage;
    }

    public int getPageSize() {
        if (pageSize <= 0) {
            pageSize = getDefaultPageSize();
        }
        return pageSize;
    }

    public void setPageSize(final int pageSize) {
        this.pageSize = pageSize;
    }

    public int getCurrentPageNumber() {
        if (currentPageNumber <= 0) {