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();
}
}
