Lucene.Net.Index.TestTermVectorsWriter.TestEndOffsetPositionWithCachingTokenFilter C# (CSharp) Метод

        public virtual void TestEndOffsetPositionWithCachingTokenFilter()
        {
            Directory dir = NewDirectory();
            Analyzer analyzer = new MockAnalyzer(Random());
            IndexWriter w = new IndexWriter(dir, NewIndexWriterConfig(TEST_VERSION_CURRENT, analyzer));
            Document doc = new Document();
            IOException priorException = null;
            TokenStream stream = analyzer.TokenStream("field", new StringReader("abcd    "));
            try
            {
                stream.Reset(); // TODO: weird to reset before wrapping with CachingTokenFilter... correct?
                TokenStream cachedStream = new CachingTokenFilter(stream);
                FieldType customType = new FieldType(TextField.TYPE_NOT_STORED);
                customType.StoreTermVectors = true;
                customType.StoreTermVectorPositions = true;
                customType.StoreTermVectorOffsets = true;
                Field f = new Field("field", cachedStream, customType);
                doc.Add(f);
                doc.Add(f);
                w.AddDocument(doc);
            }
            catch (IOException e)
            {
                priorException = e;
            }
            finally
            {
                IOUtils.CloseWhileHandlingException(priorException, stream);
            }
            w.Dispose();

            IndexReader r = DirectoryReader.Open(dir);
            TermsEnum termsEnum = r.GetTermVectors(0).Terms("field").Iterator(null);
            Assert.IsNotNull(termsEnum.Next());
            DocsAndPositionsEnum dpEnum = termsEnum.DocsAndPositions(null, null);
            Assert.AreEqual(2, termsEnum.TotalTermFreq());

            Assert.IsTrue(dpEnum.NextDoc() != DocIdSetIterator.NO_MORE_DOCS);
            dpEnum.NextPosition();
            Assert.AreEqual(0, dpEnum.StartOffset());
            Assert.AreEqual(4, dpEnum.EndOffset());

            dpEnum.NextPosition();
            Assert.AreEqual(8, dpEnum.StartOffset());
            Assert.AreEqual(12, dpEnum.EndOffset());
            Assert.AreEqual(DocIdSetIterator.NO_MORE_DOCS, dpEnum.NextDoc());

            r.Dispose();
            dir.Dispose();
        }