org.apache.lucene.codecs.lucene42
Class Lucene42NormsFormat

java.lang.Object
  org.apache.lucene.codecs.NormsFormat
      org.apache.lucene.codecs.lucene42.Lucene42NormsFormat

public class Lucene42NormsFormat
extends NormsFormat

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:

Lucene42DocValuesFormat

Constructor Summary

Lucene42NormsFormat()
Calls Lucene42DocValuesFormat(PackedInts.FASTEST)

Lucene42NormsFormat(float acceptableOverheadRatio)
Creates a new Lucene42DocValuesFormat with the specified acceptableOverheadRatio for NumericDocValues.

Method Summary

DocValuesConsumer	normsConsumer(SegmentWriteState state) Returns a DocValuesConsumer to write norms to the index.
DocValuesProducer	normsProducer(SegmentReadState state) Returns a DocValuesProducer to read norms from the index.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

Lucene42NormsFormat

public Lucene42NormsFormat()

Calls Lucene42DocValuesFormat(PackedInts.FASTEST)

Lucene42NormsFormat

public Lucene42NormsFormat(float acceptableOverheadRatio)

Creates a new Lucene42DocValuesFormat with the specified acceptableOverheadRatio for NumericDocValues.

Parameters:

acceptableOverheadRatio - compression parameter for numerics. Currently this is only used when the number of unique values is small.

WARNING: This API is experimental and might change in incompatible ways in the next release.

Method Detail

normsConsumer

public DocValuesConsumer normsConsumer(SegmentWriteState state)
                                throws IOException

Description copied from class: NormsFormat

Returns a DocValuesConsumer to write norms to the index.

Specified by:

normsConsumer in class NormsFormat

Throws:

IOException

normsProducer

public DocValuesProducer normsProducer(SegmentReadState state)
                                throws IOException

Description copied from class: NormsFormat

Returns a DocValuesProducer 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 class NormsFormat

Throws:

IOException