Module org.apache.lucene.queries
Class IndexReaderFunctions.IndexReaderDoubleValuesSource
- java.lang.Object
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- org.apache.lucene.search.DoubleValuesSource
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- org.apache.lucene.queries.function.IndexReaderFunctions.IndexReaderDoubleValuesSource
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- All Implemented Interfaces:
SegmentCacheable
- Enclosing class:
- IndexReaderFunctions
private static class IndexReaderFunctions.IndexReaderDoubleValuesSource extends DoubleValuesSource
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Field Summary
Fields Modifier and Type Field Description private java.lang.String
description
private IndexReaderFunctions.ReaderFunction
func
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Fields inherited from class org.apache.lucene.search.DoubleValuesSource
SCORES
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Constructor Summary
Constructors Modifier Constructor Description private
IndexReaderDoubleValuesSource(IndexReaderFunctions.ReaderFunction func, java.lang.String description)
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description boolean
equals(java.lang.Object o)
DoubleValues
getValues(LeafReaderContext ctx, DoubleValues scores)
Returns aDoubleValues
instance for the passed-in LeafReaderContext and scoresint
hashCode()
boolean
isCacheable(LeafReaderContext ctx)
boolean
needsScores()
Return true if document scores are needed to calculate valuesDoubleValuesSource
rewrite(IndexSearcher searcher)
Return a DoubleValuesSource specialised for the given IndexSearcherjava.lang.String
toString()
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Methods inherited from class org.apache.lucene.search.DoubleValuesSource
constant, explain, fromDoubleField, fromField, fromFloatField, fromIntField, fromLongField, fromQuery, fromScorer, getSortField, similarityToQueryVector, similarityToQueryVector, toLongValuesSource
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Field Detail
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func
private final IndexReaderFunctions.ReaderFunction func
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description
private final java.lang.String description
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Constructor Detail
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IndexReaderDoubleValuesSource
private IndexReaderDoubleValuesSource(IndexReaderFunctions.ReaderFunction func, java.lang.String description)
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Method Detail
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getValues
public DoubleValues getValues(LeafReaderContext ctx, DoubleValues scores) throws java.io.IOException
Description copied from class:DoubleValuesSource
Returns aDoubleValues
instance for the passed-in LeafReaderContext and scoresIf scores are not needed to calculate the values (ie
returns false
, callers may safely passnull
for thescores
parameter.- Specified by:
getValues
in classDoubleValuesSource
- Throws:
java.io.IOException
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needsScores
public boolean needsScores()
Description copied from class:DoubleValuesSource
Return true if document scores are needed to calculate values- Specified by:
needsScores
in classDoubleValuesSource
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rewrite
public DoubleValuesSource rewrite(IndexSearcher searcher) throws java.io.IOException
Description copied from class:DoubleValuesSource
Return a DoubleValuesSource specialised for the given IndexSearcherImplementations should assume that this will only be called once. IndexReader-independent implementations can just return
this
Queries that use DoubleValuesSource objects should call rewrite() during
Query.createWeight(IndexSearcher, ScoreMode, float)
rather than duringQuery.rewrite(IndexSearcher)
to avoid IndexReader reference leakage.For the same reason, implementations that cache references to the IndexSearcher should return a new object from this method.
- Specified by:
rewrite
in classDoubleValuesSource
- Throws:
java.io.IOException
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toString
public java.lang.String toString()
- Specified by:
toString
in classDoubleValuesSource
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equals
public boolean equals(java.lang.Object o)
- Specified by:
equals
in classDoubleValuesSource
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hashCode
public int hashCode()
- Specified by:
hashCode
in classDoubleValuesSource
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isCacheable
public boolean isCacheable(LeafReaderContext ctx)
- Returns:
true
if the object can be cached against a given leaf
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