Lucene.Net.Index.TestIndexReader.TestGetFieldNames C# (CSharp) Method

		public virtual void  TestGetFieldNames()
		{
			RAMDirectory d = new MockRAMDirectory();
			// set up writer
            IndexWriter writer = new IndexWriter(d, new StandardAnalyzer(Util.Version.LUCENE_CURRENT), true, IndexWriter.MaxFieldLength.LIMITED);
			AddDocumentWithFields(writer);
			writer.Close();
			// set up reader
			IndexReader reader = IndexReader.Open(d, true);
			System.Collections.Generic.ICollection<string> fieldNames = reader.GetFieldNames(IndexReader.FieldOption.ALL);
			Assert.IsTrue(CollectionsHelper.Contains(fieldNames, "keyword"));
			Assert.IsTrue(CollectionsHelper.Contains(fieldNames, "text"));
			Assert.IsTrue(CollectionsHelper.Contains(fieldNames, "unindexed"));
			Assert.IsTrue(CollectionsHelper.Contains(fieldNames, "unstored"));
			reader.Close();
			// add more documents
            writer = new IndexWriter(d, new StandardAnalyzer(Util.Version.LUCENE_CURRENT), false, IndexWriter.MaxFieldLength.LIMITED);
			// want to get some more segments here
			for (int i = 0; i < 5 * writer.MergeFactor; i++)
			{
				AddDocumentWithFields(writer);
			}
			// new fields are in some different segments (we hope)
			for (int i = 0; i < 5 * writer.MergeFactor; i++)
			{
				AddDocumentWithDifferentFields(writer);
			}
			// new termvector fields
			for (int i = 0; i < 5 * writer.MergeFactor; i++)
			{
				AddDocumentWithTermVectorFields(writer);
			}
			
			writer.Close();
			// verify fields again
			reader = IndexReader.Open(d, true);
			fieldNames = reader.GetFieldNames(IndexReader.FieldOption.ALL);
			Assert.AreEqual(13, fieldNames.Count); // the following fields
			Assert.IsTrue(CollectionsHelper.Contains(fieldNames, "keyword"));
			Assert.IsTrue(CollectionsHelper.Contains(fieldNames, "text"));
			Assert.IsTrue(CollectionsHelper.Contains(fieldNames, "unindexed"));
			Assert.IsTrue(CollectionsHelper.Contains(fieldNames, "unstored"));
			Assert.IsTrue(CollectionsHelper.Contains(fieldNames, "keyword2"));
			Assert.IsTrue(CollectionsHelper.Contains(fieldNames, "text2"));
			Assert.IsTrue(CollectionsHelper.Contains(fieldNames, "unindexed2"));
			Assert.IsTrue(CollectionsHelper.Contains(fieldNames, "unstored2"));
			Assert.IsTrue(CollectionsHelper.Contains(fieldNames, "tvnot"));
			Assert.IsTrue(CollectionsHelper.Contains(fieldNames, "termvector"));
			Assert.IsTrue(CollectionsHelper.Contains(fieldNames, "tvposition"));
			Assert.IsTrue(CollectionsHelper.Contains(fieldNames, "tvoffset"));
			Assert.IsTrue(CollectionsHelper.Contains(fieldNames, "tvpositionoffset"));
			
			// verify that only indexed fields were returned
			fieldNames = reader.GetFieldNames(IndexReader.FieldOption.INDEXED);
			Assert.AreEqual(11, fieldNames.Count); // 6 original + the 5 termvector fields 
			Assert.IsTrue(CollectionsHelper.Contains(fieldNames, "keyword"));
			Assert.IsTrue(CollectionsHelper.Contains(fieldNames, "text"));
			Assert.IsTrue(CollectionsHelper.Contains(fieldNames, "unstored"));
			Assert.IsTrue(CollectionsHelper.Contains(fieldNames, "keyword2"));
			Assert.IsTrue(CollectionsHelper.Contains(fieldNames, "text2"));
			Assert.IsTrue(CollectionsHelper.Contains(fieldNames, "unstored2"));
			Assert.IsTrue(CollectionsHelper.Contains(fieldNames, "tvnot"));
			Assert.IsTrue(CollectionsHelper.Contains(fieldNames, "termvector"));
			Assert.IsTrue(CollectionsHelper.Contains(fieldNames, "tvposition"));
			Assert.IsTrue(CollectionsHelper.Contains(fieldNames, "tvoffset"));
			Assert.IsTrue(CollectionsHelper.Contains(fieldNames, "tvpositionoffset"));
			
			// verify that only unindexed fields were returned
			fieldNames = reader.GetFieldNames(IndexReader.FieldOption.UNINDEXED);
			Assert.AreEqual(2, fieldNames.Count); // the following fields
			Assert.IsTrue(CollectionsHelper.Contains(fieldNames, "unindexed"));
			Assert.IsTrue(CollectionsHelper.Contains(fieldNames, "unindexed2"));
			
			// verify index term vector fields  
			fieldNames = reader.GetFieldNames(IndexReader.FieldOption.TERMVECTOR);
			Assert.AreEqual(1, fieldNames.Count); // 1 field has term vector only
			Assert.IsTrue(CollectionsHelper.Contains(fieldNames, "termvector"));
			
			fieldNames = reader.GetFieldNames(IndexReader.FieldOption.TERMVECTOR_WITH_POSITION);
			Assert.AreEqual(1, fieldNames.Count); // 4 fields are indexed with term vectors
			Assert.IsTrue(CollectionsHelper.Contains(fieldNames, "tvposition"));
			
			fieldNames = reader.GetFieldNames(IndexReader.FieldOption.TERMVECTOR_WITH_OFFSET);
			Assert.AreEqual(1, fieldNames.Count); // 4 fields are indexed with term vectors
			Assert.IsTrue(CollectionsHelper.Contains(fieldNames, "tvoffset"));
			
			fieldNames = reader.GetFieldNames(IndexReader.FieldOption.TERMVECTOR_WITH_POSITION_OFFSET);
			Assert.AreEqual(1, fieldNames.Count); // 4 fields are indexed with term vectors
			Assert.IsTrue(CollectionsHelper.Contains(fieldNames, "tvpositionoffset"));
			reader.Close();
			d.Close();
		}