if (StringUtil.isBlank(start)) {
                startPosition = fessConfig.getPagingSearchPageStartAsInteger();
            } else {
                try {
                    startPosition = Integer.parseInt(start);
                } catch (final NumberFormatException e) {
                    startPosition = fessConfig.getPagingSearchPageStartAsInteger();
                }
            }
            return startPosition;

        @Override
        public String getSort() {
            return null;
        }

        @Override
        public int getStartPosition() {
            return fessConfig.getPagingSearchPageStartAsInteger();
        }

        @Override
        public int getPageSize() {
            return pageSize;
        }

        @Override
        public int getOffset() {