Lucene.Net.Codecs.DocValuesConsumer.GetMergeSortedFieldDocToOrdEnumerable C# (CSharp) Метод

        private IEnumerable<long?> GetMergeSortedFieldDocToOrdEnumerable(AtomicReader[] readers, SortedDocValues[] dvs, OrdinalMap map)
        {
            int readerUpTo = -1;
            int docIDUpTo = 0;
            AtomicReader currentReader = null;
            Bits currentLiveDocs = null;

            while (true)
            {
                if (readerUpTo == readers.Length)
                {
                    yield break;
                }

                if (currentReader == null || docIDUpTo == currentReader.MaxDoc)
                {
                    readerUpTo++;
                    if (readerUpTo < readers.Length)
                    {
                        currentReader = readers[readerUpTo];
                        currentLiveDocs = currentReader.LiveDocs;
                    }
                    docIDUpTo = 0;
                    continue;
                }

                if (currentLiveDocs == null || currentLiveDocs.Get(docIDUpTo))
                {
                    int segOrd = dvs[readerUpTo].GetOrd(docIDUpTo);
                    docIDUpTo++;
                    yield return map.GetGlobalOrd(readerUpTo, segOrd);
                    continue;
                }

                docIDUpTo++;
            }
        }