Lucene.Net.Index.SegmentInfos.SegmentWasUpgraded C# (CSharp) Method

        private static bool SegmentWasUpgraded(Directory directory, SegmentInfo si)
        {
            // Check marker file:
            string markerFileName = IndexFileNames.SegmentFileName(si.Name, "upgraded", Lucene3xSegmentInfoFormat.UPGRADED_SI_EXTENSION);
            IndexInput @in = null;
            try
            {
                @in = directory.OpenInput(markerFileName, IOContext.READONCE);
                if (CodecUtil.CheckHeader(@in, SEGMENT_INFO_UPGRADE_CODEC, SEGMENT_INFO_UPGRADE_VERSION, SEGMENT_INFO_UPGRADE_VERSION) == 0)
                {
                    return true;
                }
            }
            catch (IOException)
            {
                // Ignore: if something is wrong w/ the marker file,
                // we will just upgrade again
            }
            finally
            {
                if (@in != null)
                {
                    IOUtils.CloseWhileHandlingException(@in);
                }
            }
            return false;
        }