Lucene.Net.Index.SegmentMerger.CopyVectorsWithDeletions C# (CSharp) Method

		private void  CopyVectorsWithDeletions(TermVectorsWriter termVectorsWriter, TermVectorsReader matchingVectorsReader, IndexReader reader)
		{
			int maxDoc = reader.MaxDoc;
			if (matchingVectorsReader != null)
			{
				// We can bulk-copy because the fieldInfos are "congruent"
				for (int docNum = 0; docNum < maxDoc; )
				{
					if (reader.IsDeleted(docNum))
					{
						// skip deleted docs
						++docNum;
						continue;
					}
					// We can optimize this case (doing a bulk byte copy) since the field 
					// numbers are identical
					int start = docNum, numDocs = 0;
					do 
					{
						docNum++;
						numDocs++;
						if (docNum >= maxDoc)
							break;
						if (reader.IsDeleted(docNum))
						{
							docNum++;
							break;
						}
					}
					while (numDocs < MAX_RAW_MERGE_DOCS);
					
					matchingVectorsReader.RawDocs(rawDocLengths, rawDocLengths2, start, numDocs);
					termVectorsWriter.AddRawDocuments(matchingVectorsReader, rawDocLengths, rawDocLengths2, numDocs);
					checkAbort.Work(300 * numDocs);
				}
			}
			else
			{
				for (int docNum = 0; docNum < maxDoc; docNum++)
				{
					if (reader.IsDeleted(docNum))
					{
						// skip deleted docs
						continue;
					}
					
					// NOTE: it's very important to first assign to vectors then pass it to
					// termVectorsWriter.addAllDocVectors; see LUCENE-1282
					ITermFreqVector[] vectors = reader.GetTermFreqVectors(docNum);
					termVectorsWriter.AddAllDocVectors(vectors);
					checkAbort.Work(300);
				}
			}
		}