Class Lucene42NormsFormat
java.lang.Object
org.apache.lucene.codecs.NormsFormat
org.apache.lucene.codecs.lucene42.Lucene42NormsFormat
Lucene 4.2 score normalization format.
NOTE: this uses the same format as Lucene42DocValuesFormat
Numeric DocValues, but with different file extensions, and passing
PackedInts.FASTEST
for uncompressed encoding: trading off
space for performance.
Files:
- .nvd: DocValues data
- .nvm: DocValues metadata
- See Also:
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Constructor Summary
ConstructorsConstructorDescriptionLucene42NormsFormat
(float acceptableOverheadRatio) Creates a new Lucene42DocValuesFormat with the specifiedacceptableOverheadRatio
for NumericDocValues. -
Method Summary
Modifier and TypeMethodDescriptionnormsConsumer
(SegmentWriteState state) Returns aDocValuesConsumer
to write norms to the index.normsProducer
(SegmentReadState state) Returns aDocValuesProducer
to read norms from the index.
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Constructor Details
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Lucene42NormsFormat
public Lucene42NormsFormat() -
Lucene42NormsFormat
public Lucene42NormsFormat(float acceptableOverheadRatio) Creates a new Lucene42DocValuesFormat with the specifiedacceptableOverheadRatio
for NumericDocValues.- Parameters:
acceptableOverheadRatio
- compression parameter for numerics. Currently this is only used when the number of unique values is small.
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Method Details
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normsConsumer
Description copied from class:NormsFormat
Returns aDocValuesConsumer
to write norms to the index.- Specified by:
normsConsumer
in classNormsFormat
- Throws:
IOException
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normsProducer
Description copied from class:NormsFormat
Returns aDocValuesProducer
to read norms from the index.NOTE: by the time this call returns, it must hold open any files it will need to use; else, those files may be deleted. Additionally, required files may be deleted during the execution of this call before there is a chance to open them. Under these circumstances an IOException should be thrown by the implementation. IOExceptions are expected and will automatically cause a retry of the segment opening logic with the newly revised segments.
- Specified by:
normsProducer
in classNormsFormat
- Throws:
IOException
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