Examples with RankQuery org.apache.solr.search.RankQuery used on opensource projects

Example 1 with RankQuery

use of org.apache.solr.search.RankQuery in project lucene-solr by apache.

the class QueryComponent method prepare.

@Override
public void prepare(ResponseBuilder rb) throws IOException {
    SolrQueryRequest req = rb.req;
    SolrParams params = req.getParams();
    if (!params.getBool(COMPONENT_NAME, true)) {
        return;
    }
    SolrQueryResponse rsp = rb.rsp;
    // Set field flags    
    ReturnFields returnFields = new SolrReturnFields(req);
    rsp.setReturnFields(returnFields);
    int flags = 0;
    if (returnFields.wantsScore()) {
        flags |= SolrIndexSearcher.GET_SCORES;
    }
    rb.setFieldFlags(flags);
    String defType = params.get(QueryParsing.DEFTYPE, QParserPlugin.DEFAULT_QTYPE);
    // get it from the response builder to give a different component a chance
    // to set it.
    String queryString = rb.getQueryString();
    if (queryString == null) {
        // this is the normal way it's set.
        queryString = params.get(CommonParams.Q);
        rb.setQueryString(queryString);
    }
    try {
        QParser parser = QParser.getParser(rb.getQueryString(), defType, req);
        Query q = parser.getQuery();
        if (q == null) {
            // normalize a null query to a query that matches nothing
            q = new MatchNoDocsQuery();
        }
        rb.setQuery(q);
        String rankQueryString = rb.req.getParams().get(CommonParams.RQ);
        if (rankQueryString != null) {
            QParser rqparser = QParser.getParser(rankQueryString, defType, req);
            Query rq = rqparser.getQuery();
            if (rq instanceof RankQuery) {
                RankQuery rankQuery = (RankQuery) rq;
                rb.setRankQuery(rankQuery);
                MergeStrategy mergeStrategy = rankQuery.getMergeStrategy();
                if (mergeStrategy != null) {
                    rb.addMergeStrategy(mergeStrategy);
                    if (mergeStrategy.handlesMergeFields()) {
                        rb.mergeFieldHandler = mergeStrategy;
                    }
                }
            } else {
                throw new SolrException(SolrException.ErrorCode.BAD_REQUEST, "rq parameter must be a RankQuery");
            }
        }
        rb.setSortSpec(parser.getSortSpec(true));
        rb.setQparser(parser);
        final String cursorStr = rb.req.getParams().get(CursorMarkParams.CURSOR_MARK_PARAM);
        if (null != cursorStr) {
            final CursorMark cursorMark = new CursorMark(rb.req.getSchema(), rb.getSortSpec());
            cursorMark.parseSerializedTotem(cursorStr);
            rb.setCursorMark(cursorMark);
        }
        String[] fqs = req.getParams().getParams(CommonParams.FQ);
        if (fqs != null && fqs.length != 0) {
            List<Query> filters = rb.getFilters();
            // if filters already exists, make a copy instead of modifying the original
            filters = filters == null ? new ArrayList<>(fqs.length) : new ArrayList<>(filters);
            for (String fq : fqs) {
                if (fq != null && fq.trim().length() != 0) {
                    QParser fqp = QParser.getParser(fq, req);
                    fqp.setIsFilter(true);
                    filters.add(fqp.getQuery());
                }
            }
            // if filter cache is disabled
            if (!filters.isEmpty()) {
                rb.setFilters(filters);
            }
        }
    } catch (SyntaxError e) {
        throw new SolrException(SolrException.ErrorCode.BAD_REQUEST, e);
    }
    if (params.getBool(GroupParams.GROUP, false)) {
        prepareGrouping(rb);
    } else {
        //Validate only in case of non-grouping search.
        if (rb.getSortSpec().getCount() < 0) {
            throw new SolrException(SolrException.ErrorCode.BAD_REQUEST, "'rows' parameter cannot be negative");
        }
    }
    //Input validation.
    if (rb.getSortSpec().getOffset() < 0) {
        throw new SolrException(SolrException.ErrorCode.BAD_REQUEST, "'start' parameter cannot be negative");
    }
}