Lucene.Net.Search.TestBooleanQuery.TestDeMorgan C# (CSharp) Метод

        public virtual void TestDeMorgan()
        {
            Directory dir1 = NewDirectory();
            RandomIndexWriter iw1 = new RandomIndexWriter(Random(), dir1, Similarity, TimeZone);
            Document doc1 = new Document();
            doc1.Add(NewTextField("field", "foo bar", Field.Store.NO));
            iw1.AddDocument(doc1);
            IndexReader reader1 = iw1.Reader;
            iw1.Dispose();

            Directory dir2 = NewDirectory();
            RandomIndexWriter iw2 = new RandomIndexWriter(Random(), dir2, Similarity, TimeZone);
            Document doc2 = new Document();
            doc2.Add(NewTextField("field", "foo baz", Field.Store.NO));
            iw2.AddDocument(doc2);
            IndexReader reader2 = iw2.Reader;
            iw2.Dispose();

            BooleanQuery query = new BooleanQuery(); // Query: +foo -ba*
            query.Add(new TermQuery(new Term("field", "foo")), BooleanClause.Occur.MUST);
            WildcardQuery wildcardQuery = new WildcardQuery(new Term("field", "ba*"));
            wildcardQuery.SetRewriteMethod(MultiTermQuery.SCORING_BOOLEAN_QUERY_REWRITE);
            query.Add(wildcardQuery, BooleanClause.Occur.MUST_NOT);

            MultiReader multireader = new MultiReader(reader1, reader2);
            IndexSearcher searcher = NewSearcher(multireader);
            Assert.AreEqual(0, searcher.Search(query, 10).TotalHits);


            Task foo = new Task(TestDeMorgan);

            TaskScheduler es = TaskScheduler.Default;
            searcher = new IndexSearcher(multireader, es);
            if (VERBOSE)
            {
                Console.WriteLine("rewritten form: " + searcher.Rewrite(query));
            }
            Assert.AreEqual(0, searcher.Search(query, 10).TotalHits);

            multireader.Dispose();
            reader1.Dispose();
            reader2.Dispose();
            dir1.Dispose();
            dir2.Dispose();
        }