// CompressingStoredFieldsReader.java L90 func newCompressingStoredFieldsReader(d store.Directory, si SegmentInfo, segmentSuffix string, fn FieldInfos, ctx store.IOContext, formatName string, compressionMode codec.CompressionMode) (r *CompressingStoredFieldsReader, err error) { r = &CompressingStoredFieldsReader{} r.compressionMode = compressionMode segment := si.name r.fieldInfos = fn r.numDocs = int(si.docCount) var indexStream store.IndexInput success := false defer func() { if !success { log.Println("Failed to initialize CompressionStoredFieldsReader.") if err != nil { log.Print(err) } util.Close(r, indexStream) } }() // Load the index into memory indexStreamFN := util.SegmentFileName(segment, segmentSuffix, LUCENE40_SF_FIELDS_INDEX_EXTENSION) indexStream, err = d.OpenInput(indexStreamFN, ctx) if err != nil { return nil, err } codecNameIdx := formatName + CODEC_SFX_IDX codec.CheckHeader(indexStream, codecNameIdx, CODEC_SFX_VERSION_START, CODEC_SFX_VERSION_CURRENT) if int64(codec.HeaderLength(codecNameIdx)) != indexStream.FilePointer() { panic("assert fail") } r.indexReader, err = newCompressingStoredFieldsIndexReader(indexStream, si) if err != nil { return nil, err } err = indexStream.Close() if err != nil { return nil, err } indexStream = nil // Open the data file and read metadata fieldsStreamFN := util.SegmentFileName(segment, segmentSuffix, LUCENE40_SF_FIELDS_EXTENSION) r.fieldsStream, err = d.OpenInput(fieldsStreamFN, ctx) if err != nil { return nil, err } codecNameDat := formatName + CODEC_SFX_DAT codec.CheckHeader(r.fieldsStream, codecNameDat, CODEC_SFX_VERSION_START, CODEC_SFX_VERSION_CURRENT) if int64(codec.HeaderLength(codecNameDat)) != r.fieldsStream.FilePointer() { panic("assert fail") } n, err := r.fieldsStream.ReadVInt() if err != nil { return nil, err } r.packedIntsVersion = int(n) r.decompressor = compressionMode.NewDecompressor() r.bytes = make([]byte, 0) success = true return r, nil }