Package org.apache.lucene.search

Class LongValuesSource.ConstantLongValuesSource

java.lang.Object

org.apache.lucene.search.LongValuesSource

org.apache.lucene.search.LongValuesSource.ConstantLongValuesSource

All Implemented Interfaces:

SegmentCacheable

Enclosing class:

LongValuesSource

public static class LongValuesSource.ConstantLongValuesSource
extends LongValuesSource

A ConstantLongValuesSource that always returns a constant value

NOTE: This API is for internal purposes only and might change in incompatible ways in the next release.

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.lucene.search.LongValuesSource

LongValuesSource.ConstantLongValuesSource

Method Summary

Modifier and Type	Method	Description
boolean	equals(Object o)
long	getValue()	Get the constant value.
LongValues	getValues(LeafReaderContext ctx, DoubleValues scores)	Returns a LongValues instance for the passed-in LeafReaderContext and scores
int	hashCode()
boolean	isCacheable(LeafReaderContext ctx)
boolean	needsScores()	Return true if document scores are needed to calculate values
LongValuesSource	rewrite(IndexSearcher searcher)	Return a LongValuesSource specialised for the given IndexSearcher
String	toString()

Methods inherited from class org.apache.lucene.search.LongValuesSource

constant, fromIntField, fromLongField, getSortField, toDoubleValuesSource

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Method Detail

getValues

public LongValues getValues(LeafReaderContext ctx,
                            DoubleValues scores)
                     throws IOException

Description copied from class: LongValuesSource

Returns a LongValues instance for the passed-in LeafReaderContext and scores

If scores are not needed to calculate the values (ie returns false, callers may safely pass null for the scores parameter.

Specified by:

getValues in class LongValuesSource

Throws:

IOException

isCacheable

public boolean isCacheable(LeafReaderContext ctx)

Returns:

true if the object can be cached against a given leaf

needsScores

public boolean needsScores()

Description copied from class: LongValuesSource

Return true if document scores are needed to calculate values

Specified by:

needsScores in class LongValuesSource

hashCode

public int hashCode()

Specified by:

hashCode in class LongValuesSource

equals

public boolean equals(Object o)

Specified by:

equals in class LongValuesSource

toString

public String toString()

Specified by:

toString in class LongValuesSource

rewrite

public LongValuesSource rewrite(IndexSearcher searcher)
                         throws IOException

Description copied from class: LongValuesSource

Return a LongValuesSource specialised for the given IndexSearcher

Implementations should assume that this will only be called once. IndexSearcher-independent implementations can just return this

Specified by:

rewrite in class LongValuesSource

Throws:

IOException

getValue

public long getValue()

Get the constant value.