if (logger.isDebugEnabled()) {
            logger.debug("Send {} to the searchers.", query);
        }
        final int pageSize = params.getPageSize();
        final int startPosition = params.getStartPosition();
        if (startPosition * 2 >= windowSize) {
            int offset = params.getOffset();
            if (offset < 0) {
                offset = 0;
            } else if (offset > windowSize / 2) {

                return null;
            }

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

            @Override
            public int getStartPosition() {
                return 0;
            }

            @Override
            public int getOffset() {
                return 0;
            }

            @Override

            return SearchConditionBuilder.builder(searchRequestBuilder)
                    .query(query)
                    .offset(params.getStartPosition())
                    .size(params.getPageSize())
                    .facetInfo(params.getFacetInfo())
                    .geoInfo(params.getGeoInfo())
                    .highlightInfo(params.getHighlightInfo())

        }

        @Override
        protected SearchResult search(String query, SearchRequestParams params, OptionalThing<FessUserBean> userBean) {
            int start = params.getStartPosition();
            int size = params.getPageSize();
            SearchResultBuilder builder = SearchResult.create();
            for (int i = start; i < start + size && i < allRecordCount; i++) {

                return 0;
            }

            @Override
            public int getPageSize() {
                return 10;
            }

            @Override
            public int getStartPosition() {
                return 0;
            }

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

            @Override

            return null;
        }

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

        @Override
        public int getStartPosition() {
            return startPosition;
        }

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

        @Override

            return highlightInfo;
        }

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

        @Override
        public int getStartPosition() {
            return startPosition;
        }

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

        @Override

        // search log
        if (fessConfig.isSearchLog()) {
            ComponentUtil.getSearchLogHelper()
                    .addSearchLog(params, DfTypeUtil.toLocalDateTime(requestedTime), queryId, query, params.getStartPosition(),
                            params.getPageSize(), queryResponseList);
        }

        // favorite
        if (fessConfig.isUserFavorite()) {