Class Lucene50CompressingTermVectorsFormat
- java.lang.Object
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- org.apache.lucene.codecs.TermVectorsFormat
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- org.apache.lucene.backward_codecs.lucene50.compressing.Lucene50CompressingTermVectorsFormat
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- Direct Known Subclasses:
Lucene50TermVectorsFormat
public class Lucene50CompressingTermVectorsFormat extends TermVectorsFormat
ATermVectorsFormat
that compresses chunks of documents together in order to improve the compression ratio.- WARNING: This API is experimental and might change in incompatible ways in the next release.
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Field Summary
Fields Modifier and Type Field Description protected int
blockSize
block sizeprotected int
chunkSize
chunk sizeprotected CompressionMode
compressionMode
compression modeprotected String
formatName
format nameprotected int
maxDocsPerChunk
max docs per chunkprotected String
segmentSuffix
segment suffix
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Constructor Summary
Constructors Constructor Description Lucene50CompressingTermVectorsFormat(String formatName, String segmentSuffix, CompressionMode compressionMode, int chunkSize, int maxDocsPerChunk, int blockSize)
Create a newLucene50CompressingTermVectorsFormat
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description String
toString()
TermVectorsReader
vectorsReader(Directory directory, SegmentInfo segmentInfo, FieldInfos fieldInfos, IOContext context)
TermVectorsWriter
vectorsWriter(Directory directory, SegmentInfo segmentInfo, IOContext context)
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Field Detail
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formatName
protected final String formatName
format name
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segmentSuffix
protected final String segmentSuffix
segment suffix
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compressionMode
protected final CompressionMode compressionMode
compression mode
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chunkSize
protected final int chunkSize
chunk size
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blockSize
protected final int blockSize
block size
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maxDocsPerChunk
protected final int maxDocsPerChunk
max docs per chunk
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Constructor Detail
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Lucene50CompressingTermVectorsFormat
public Lucene50CompressingTermVectorsFormat(String formatName, String segmentSuffix, CompressionMode compressionMode, int chunkSize, int maxDocsPerChunk, int blockSize)
Create a newLucene50CompressingTermVectorsFormat
.formatName
is the name of the format. This name will be used in the file formats to performcodec header checks
.The
compressionMode
parameter allows you to choose between compression algorithms that have various compression and decompression speeds so that you can pick the one that best fits your indexing and searching throughput. You should never instantiate twoLucene50CompressingTermVectorsFormat
s that have the same name but differentCompressionMode
s.chunkSize
is the minimum byte size of a chunk of documents. Higher values ofchunkSize
should improve the compression ratio but will require more memory at indexing time and might make document loading a little slower (depending on the size of your OS cache compared to the size of your index).- Parameters:
formatName
- the name of theStoredFieldsFormat
segmentSuffix
- a suffix to append to files created by this formatcompressionMode
- theCompressionMode
to usechunkSize
- the minimum number of bytes of a single chunk of stored documentsmaxDocsPerChunk
- the maximum number of documents in a single chunkblockSize
- the number of chunks to store in an index block.- See Also:
CompressionMode
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Method Detail
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vectorsReader
public final TermVectorsReader vectorsReader(Directory directory, SegmentInfo segmentInfo, FieldInfos fieldInfos, IOContext context) throws IOException
- Specified by:
vectorsReader
in classTermVectorsFormat
- Throws:
IOException
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vectorsWriter
public TermVectorsWriter vectorsWriter(Directory directory, SegmentInfo segmentInfo, IOContext context) throws IOException
- Specified by:
vectorsWriter
in classTermVectorsFormat
- Throws:
IOException
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