Lucene.Net.Index.IndexReader.DeleteDocument C# (CSharp) Method

		public virtual void  DeleteDocument(int docNum)
		{
			lock (this)
			{
				EnsureOpen();
				AcquireWriteLock();
				hasChanges = true;
				DoDelete(docNum);
			}
		}
		

        public virtual void  TestSetBufferSize()
        {
            System.IO.DirectoryInfo indexDir = new System.IO.DirectoryInfo(System.IO.Path.Combine(AppSettings.Get("tempDir", ""), "testSetBufferSize"));
            MockFSDirectory         dir      = new MockFSDirectory(indexDir, NewRandom());

            try
            {
                IndexWriter writer = new IndexWriter(dir, new WhitespaceAnalyzer(), true, IndexWriter.MaxFieldLength.LIMITED, null);
                writer.UseCompoundFile = false;
                for (int i = 0; i < 37; i++)
                {
                    Document doc = new Document();
                    doc.Add(new Field("content", "aaa bbb ccc ddd" + i, Field.Store.YES, Field.Index.ANALYZED));
                    doc.Add(new Field("id", "" + i, Field.Store.YES, Field.Index.ANALYZED));
                    writer.AddDocument(doc, null);
                }
                writer.Close();

                dir.allIndexInputs.Clear();

                IndexReader reader = IndexReader.Open((Directory)dir, false, null);
                Term        aaa    = new Term("content", "aaa");
                Term        bbb    = new Term("content", "bbb");
                Term        ccc    = new Term("content", "ccc");
                Assert.AreEqual(37, reader.DocFreq(ccc, null));
                reader.DeleteDocument(0, null);
                Assert.AreEqual(37, reader.DocFreq(aaa, null));
                dir.tweakBufferSizes();
                reader.DeleteDocument(4, null);
                Assert.AreEqual(reader.DocFreq(bbb, null), 37);
                dir.tweakBufferSizes();

                IndexSearcher searcher = new IndexSearcher(reader);
                ScoreDoc[]    hits     = searcher.Search(new TermQuery(bbb), null, 1000, null).ScoreDocs;
                dir.tweakBufferSizes();
                Assert.AreEqual(35, hits.Length);
                dir.tweakBufferSizes();
                hits = searcher.Search(new TermQuery(new Term("id", "33")), null, 1000, null).ScoreDocs;
                dir.tweakBufferSizes();
                Assert.AreEqual(1, hits.Length);
                hits = searcher.Search(new TermQuery(aaa), null, 1000, null).ScoreDocs;
                dir.tweakBufferSizes();
                Assert.AreEqual(35, hits.Length);
                searcher.Close();
                reader.Close();
            }
            finally
            {
                _TestUtil.RmDir(indexDir);
            }
        }