public override FieldInfos Read(Directory directory, string segmentName, string segmentSuffix, IOContext iocontext) { string fileName = IndexFileNames.SegmentFileName(segmentName, "", PreFlexRWFieldInfosWriter.FIELD_INFOS_EXTENSION); IndexInput input = directory.OpenInput(fileName, iocontext); try { int format = input.ReadVInt32(); if (format > FORMAT_MINIMUM) { throw new IndexFormatTooOldException(input, format, FORMAT_MINIMUM, PreFlexRWFieldInfosWriter.FORMAT_CURRENT); } if (format < PreFlexRWFieldInfosWriter.FORMAT_CURRENT && format != PreFlexRWFieldInfosWriter.FORMAT_PREFLEX_RW) { throw new IndexFormatTooNewException(input, format, FORMAT_MINIMUM, PreFlexRWFieldInfosWriter.FORMAT_CURRENT); } int size = input.ReadVInt32(); //read in the size FieldInfo[] infos = new FieldInfo[size]; for (int i = 0; i < size; i++) { string name = input.ReadString(); int fieldNumber = format == PreFlexRWFieldInfosWriter.FORMAT_PREFLEX_RW ? input.ReadInt32() : i; byte bits = input.ReadByte(); bool isIndexed = (bits & PreFlexRWFieldInfosWriter.IS_INDEXED) != 0; bool storeTermVector = (bits & PreFlexRWFieldInfosWriter.STORE_TERMVECTOR) != 0; bool omitNorms = (bits & PreFlexRWFieldInfosWriter.OMIT_NORMS) != 0; bool storePayloads = (bits & PreFlexRWFieldInfosWriter.STORE_PAYLOADS) != 0; IndexOptions indexOptions; if (!isIndexed) { indexOptions = IndexOptions.NONE; } else if ((bits & PreFlexRWFieldInfosWriter.OMIT_TERM_FREQ_AND_POSITIONS) != 0) { indexOptions = IndexOptions.DOCS_ONLY; } else if ((bits & PreFlexRWFieldInfosWriter.OMIT_POSITIONS) != 0) { if (format <= PreFlexRWFieldInfosWriter.FORMAT_OMIT_POSITIONS) { indexOptions = IndexOptions.DOCS_AND_FREQS; } else { throw new CorruptIndexException("Corrupt fieldinfos, OMIT_POSITIONS set but format=" + format + " (resource: " + input + ")"); } } else { indexOptions = IndexOptions.DOCS_AND_FREQS_AND_POSITIONS; } // LUCENE-3027: past indices were able to write // storePayloads=true when omitTFAP is also true, // which is invalid. We correct that, here: if (indexOptions != IndexOptions.DOCS_AND_FREQS_AND_POSITIONS) { storePayloads = false; } DocValuesType normType = isIndexed && !omitNorms ? DocValuesType.NUMERIC : DocValuesType.NONE; if (format == PreFlexRWFieldInfosWriter.FORMAT_PREFLEX_RW && normType != DocValuesType.NONE) { // RW can have norms but doesn't write them normType = input.ReadByte() != 0 ? DocValuesType.NUMERIC : DocValuesType.NONE; } infos[i] = new FieldInfo(name, isIndexed, fieldNumber, storeTermVector, omitNorms, storePayloads, indexOptions, DocValuesType.NONE, normType, null); } if (input.GetFilePointer() != input.Length) { throw new CorruptIndexException("did not read all bytes from file \"" + fileName + "\": read " + input.GetFilePointer() + " vs size " + input.Length + " (resource: " + input + ")"); } return(new FieldInfos(infos)); } finally { input.Dispose(); } }