Lucene.Net.Facet.DrillSideways.Search C# (CSharp) Method

        public virtual DrillSidewaysResult Search(DrillDownQuery query, Collector hitCollector)
        {

            IDictionary<string, int?> drillDownDims = query.Dims;

            FacetsCollector drillDownCollector = new FacetsCollector();

            if (drillDownDims.Count == 0)
            {
                // There are no drill-down dims, so there is no
                // drill-sideways to compute:
                searcher.Search(query, MultiCollector.Wrap(hitCollector, drillDownCollector));
                return new DrillSidewaysResult(BuildFacetsResult(drillDownCollector, null, null), null);
            }

            BooleanQuery ddq = query.BooleanQuery;
            BooleanClause[] clauses = ddq.Clauses;

            Query baseQuery;
            int startClause;
            if (clauses.Length == drillDownDims.Count)
            {
                // TODO: we could optimize this pure-browse case by
                // making a custom scorer instead:
                baseQuery = new MatchAllDocsQuery();
                startClause = 0;
            }
            else
            {
                Debug.Assert(clauses.Length == 1 + drillDownDims.Count);
                baseQuery = clauses[0].Query;
                startClause = 1;
            }

            FacetsCollector[] drillSidewaysCollectors = new FacetsCollector[drillDownDims.Count];
            for (int i = 0; i < drillSidewaysCollectors.Length; i++)
            {
                drillSidewaysCollectors[i] = new FacetsCollector();
            }

            Query[] drillDownQueries = new Query[clauses.Length - startClause];
            for (int i = startClause; i < clauses.Length; i++)
            {
                drillDownQueries[i - startClause] = clauses[i].Query;
            }
            DrillSidewaysQuery dsq = new DrillSidewaysQuery(baseQuery, drillDownCollector, drillSidewaysCollectors, drillDownQueries, ScoreSubDocsAtOnce());
            searcher.Search(dsq, hitCollector);

            return new DrillSidewaysResult(BuildFacetsResult(drillDownCollector, drillSidewaysCollectors, drillDownDims.Keys.ToArray()), null);
        }