org.elasticsearch.common.lucene.search.function

Class FieldValueFactorFunction

java.lang.Object

org.elasticsearch.common.lucene.search.function.ScoreFunction

org.elasticsearch.common.lucene.search.function.FieldValueFactorFunction

public class FieldValueFactorFunction
extends ScoreFunction

A function_score function that multiplies the score with the value of a field from the document, optionally multiplying the field by a factor first, and applying a modification (log, ln, sqrt, square, etc) afterwards.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	FieldValueFactorFunction.Modifier The Type class encapsulates the modification types that can be applied to the score/value product.

Constructor Summary

Constructors

Constructor and Description
FieldValueFactorFunction(String field, float boostFactor, FieldValueFactorFunction.Modifier modifierType, Double missing, IndexNumericFieldData indexFieldData)

Method Summary

Methods

Modifier and Type	Method and Description
LeafScoreFunction	getLeafScoreFunction(org.apache.lucene.index.LeafReaderContext ctx)
boolean	needsScores() Indicates if document scores are needed by this function.

Methods inherited from class org.elasticsearch.common.lucene.search.function.ScoreFunction

getDefaultScoreCombiner

Methods inherited from class java.lang.Object

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

Constructor Detail

FieldValueFactorFunction

public FieldValueFactorFunction(String field,
                        float boostFactor,
                        FieldValueFactorFunction.Modifier modifierType,
                        Double missing,
                        IndexNumericFieldData indexFieldData)

Method Detail

getLeafScoreFunction

public LeafScoreFunction getLeafScoreFunction(org.apache.lucene.index.LeafReaderContext ctx)

Specified by:

getLeafScoreFunction in class ScoreFunction

needsScores

public boolean needsScores()

Description copied from class: ScoreFunction

Indicates if document scores are needed by this function.

Specified by:

needsScores in class ScoreFunction

Returns:

true if scores are needed.