Module org.apache.lucene.expressions

Package org.apache.lucene.expressions

Class CachingExpressionValueSource

java.lang.Object

org.apache.lucene.search.DoubleValuesSource

org.apache.lucene.expressions.ExpressionValueSource

org.apache.lucene.expressions.CachingExpressionValueSource

All Implemented Interfaces:

SegmentCacheable

final class CachingExpressionValueSource
extends ExpressionValueSource

This expression value source shares one value cache when generating ExpressionFunctionValues such that only one value along the whole generation tree is corresponding to one name

Field Summary

Fields inherited from class org.apache.lucene.expressions.ExpressionValueSource

expression, needsScores, variables

Fields inherited from class org.apache.lucene.search.DoubleValuesSource

SCORES

Constructor Summary

Constructors

Constructor	Description
CachingExpressionValueSource(Bindings bindings, Expression expression)
CachingExpressionValueSource(ExpressionValueSource expressionValueSource)
CachingExpressionValueSource(DoubleValuesSource[] variables, Expression expression, boolean needsScores)

Method Summary

Modifier and Type	Method	Description
DoubleValues	getValues(LeafReaderContext readerContext, DoubleValues scores)	Returns a DoubleValues instance for the passed-in LeafReaderContext and scores
private DoubleValues	getValuesWithCache(LeafReaderContext readerContext, DoubleValues scores, Map<String,DoubleValues> valuesCache)

Methods inherited from class org.apache.lucene.expressions.ExpressionValueSource

equals, explain, hashCode, isCacheable, needsScores, rewrite, toString, zeroWhenUnpositioned

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

constant, fromDoubleField, fromField, fromFloatField, fromIntField, fromLongField, fromQuery, fromScorer, getSortField, similarityToQueryVector, similarityToQueryVector, toLongValuesSource

Methods inherited from class java.lang.Object

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

Constructor Details

CachingExpressionValueSource

CachingExpressionValueSource(Bindings bindings,
 Expression expression)

CachingExpressionValueSource

CachingExpressionValueSource(DoubleValuesSource[] variables,
 Expression expression,
 boolean needsScores)

CachingExpressionValueSource

public CachingExpressionValueSource(ExpressionValueSource expressionValueSource)

Method Details

getValues

public DoubleValues getValues(LeafReaderContext readerContext,
 DoubleValues scores)
                       throws IOException

Description copied from class: DoubleValuesSource

Returns a DoubleValues 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.

Overrides:

getValues in class ExpressionValueSource

Throws:

IOException

getValuesWithCache

private DoubleValues getValuesWithCache(LeafReaderContext readerContext,
 DoubleValues scores,
 Map<String,DoubleValues> valuesCache)
                                 throws IOException

Throws:

IOException