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

        private IEnumerable<long?> GetMergeSortedSetDocToOrdCountEnumerable(AtomicReader[] readers, SortedSetDocValues[] dvs)
        {
            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))
                {
                    SortedSetDocValues dv = dvs[readerUpto];
                    dv.Document = docIDUpto;
                    long value = 0;
                    while (dv.NextOrd() != SortedSetDocValues.NO_MORE_ORDS)
                    {
                        value++;
                    }
                    docIDUpto++;
                    yield return value;
                    continue;
                }

                docIDUpto++;
            }
        }