Lucene.Net.Facet.DrillDownQuery.GetFilter C# (CSharp) Method

        internal static Filter GetFilter(Query query)
        {
            var scoreQuery = query as ConstantScoreQuery;
            if (scoreQuery != null)
            {
                ConstantScoreQuery csq = scoreQuery;
                Filter filter = csq.Filter;
                if (filter != null)
                {
                    return filter;
                }
                else
                {
                    return GetFilter(csq.Query);
                }
            }
            else
            {
                return null;
            }
        }

        public override Weight CreateWeight(IndexSearcher searcher)
        {
            Weight baseWeight = baseQuery.CreateWeight(searcher);

            object[] drillDowns = new object[drillDownQueries.Length];
            for (int dim = 0; dim < drillDownQueries.Length; dim++)
            {
                Query  query  = drillDownQueries[dim];
                Filter filter = DrillDownQuery.GetFilter(query);
                if (filter != null)
                {
                    drillDowns[dim] = filter;
                }
                else
                {
                    // TODO: would be nice if we could say "we will do no
                    // scoring" here....
                    drillDowns[dim] = searcher.Rewrite(query).CreateWeight(searcher);
                }
            }

            return(new WeightAnonymousInnerClassHelper(this, baseWeight, drillDowns));
        }