/// <summary>
/// Sole constructor. </summary>
public CompressingTermVectorsReader(Directory d, SegmentInfo si, string segmentSuffix, FieldInfos fn, IOContext context, string formatName, CompressionMode compressionMode)
{
this.compressionMode = compressionMode;
string segment = si.Name;
bool success = false;
fieldInfos = fn;
numDocs = si.DocCount;
ChecksumIndexInput indexStream = null;
try
{
// Load the index into memory
string indexStreamFN = IndexFileNames.SegmentFileName(segment, segmentSuffix, CompressingTermVectorsWriter.VECTORS_INDEX_EXTENSION);
indexStream = d.OpenChecksumInput(indexStreamFN, context);
string codecNameIdx = formatName + CompressingTermVectorsWriter.CODEC_SFX_IDX;
version = CodecUtil.CheckHeader(indexStream, codecNameIdx, CompressingTermVectorsWriter.VERSION_START, CompressingTermVectorsWriter.VERSION_CURRENT);
Debug.Assert(CodecUtil.HeaderLength(codecNameIdx) == indexStream.GetFilePointer());
indexReader = new CompressingStoredFieldsIndexReader(indexStream, si);
if (version >= CompressingTermVectorsWriter.VERSION_CHECKSUM)
{
indexStream.ReadVInt64(); // the end of the data file
CodecUtil.CheckFooter(indexStream);
}
else
{
#pragma warning disable 612, 618
CodecUtil.CheckEOF(indexStream);
#pragma warning restore 612, 618
}
indexStream.Dispose();
indexStream = null;
// Open the data file and read metadata
string vectorsStreamFN = IndexFileNames.SegmentFileName(segment, segmentSuffix, CompressingTermVectorsWriter.VECTORS_EXTENSION);
vectorsStream = d.OpenInput(vectorsStreamFN, context);
string codecNameDat = formatName + CompressingTermVectorsWriter.CODEC_SFX_DAT;
int version2 = CodecUtil.CheckHeader(vectorsStream, codecNameDat, CompressingTermVectorsWriter.VERSION_START, CompressingTermVectorsWriter.VERSION_CURRENT);
if (version != version2)
{
throw new Exception("Version mismatch between stored fields index and data: " + version + " != " + version2);
}
Debug.Assert(CodecUtil.HeaderLength(codecNameDat) == vectorsStream.GetFilePointer());
packedIntsVersion = vectorsStream.ReadVInt32();
chunkSize = vectorsStream.ReadVInt32();
decompressor = compressionMode.NewDecompressor();
this.reader = new BlockPackedReaderIterator(vectorsStream, packedIntsVersion, CompressingTermVectorsWriter.BLOCK_SIZE, 0);
success = true;
}
finally
{
if (!success)
{
IOUtils.DisposeWhileHandlingException(this, indexStream);
}
}
}
// used by clone
private CompressingTermVectorsReader(CompressingTermVectorsReader reader)
{
this.fieldInfos = reader.fieldInfos;
this.vectorsStream = (IndexInput)reader.vectorsStream.Clone();
this.indexReader = (CompressingStoredFieldsIndexReader)reader.indexReader.Clone();
this.packedIntsVersion = reader.packedIntsVersion;
this.compressionMode = reader.compressionMode;
this.decompressor = (Decompressor)reader.decompressor.Clone();
this.chunkSize = reader.chunkSize;
this.numDocs = reader.numDocs;
this.reader = new BlockPackedReaderIterator(vectorsStream, packedIntsVersion, CompressingTermVectorsWriter.BLOCK_SIZE, 0);
this.version = reader.version;
this.closed = false;
}
