Package org.elasticsearch.index.query.functionscore

Class DecayFunctionBuilder.AbstractDistanceScoreFunction

java.lang.Object

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

org.elasticsearch.index.query.functionscore.DecayFunctionBuilder.AbstractDistanceScoreFunction

Enclosing class:

DecayFunctionBuilder<DFB extends DecayFunctionBuilder<DFB>>

public abstract static class DecayFunctionBuilder.AbstractDistanceScoreFunction
extends ScoreFunction

This is the base class for scoring a single field.

Field Summary

Fields

Modifier and Type	Field	Description
protected MultiValueMode	mode
protected double	offset

Constructor Summary

Constructors

Constructor	Description
AbstractDistanceScoreFunction(double userSuppiedScale, double decay, double offset, DecayFunction func, MultiValueMode mode)

Method Summary

Modifier and Type	Method	Description
protected abstract NumericDoubleValues	distance(org.apache.lucene.index.LeafReaderContext context)	This function computes the distance from a defined origin.
protected boolean	doEquals(ScoreFunction other)	Indicates whether some other ScoreFunction object of the same type is "equal to" this one.
protected int	doHashCode()
protected abstract String	getDistanceString(org.apache.lucene.index.LeafReaderContext ctx, int docId)
protected abstract String	getFieldName()
LeafScoreFunction	getLeafScoreFunction(org.apache.lucene.index.LeafReaderContext ctx)

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

equals, getDefaultScoreCombiner, getWeight, hashCode, needsScores, rewrite

Methods inherited from class java.lang.Object

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

Field Details

offset

protected final double offset

mode

protected final MultiValueMode mode

Constructor Details

AbstractDistanceScoreFunction

public AbstractDistanceScoreFunction(double userSuppiedScale,
 double decay,
 double offset,
 DecayFunction func,
 MultiValueMode mode)

Method Details

distance

protected abstract NumericDoubleValues distance(org.apache.lucene.index.LeafReaderContext context)

This function computes the distance from a defined origin. Since the value of the document is read from the index, it cannot be guaranteed that the value actually exists. If it does not, we assume the user handles this case in the query and return 0.

getLeafScoreFunction

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

Specified by:

getLeafScoreFunction in class ScoreFunction

getDistanceString

protected abstract String getDistanceString(org.apache.lucene.index.LeafReaderContext ctx,
 int docId)
                                     throws IOException

Throws:

IOException

getFieldName

protected abstract String getFieldName()

doEquals

protected boolean doEquals(ScoreFunction other)

Description copied from class: ScoreFunction

Indicates whether some other ScoreFunction object of the same type is "equal to" this one.

Specified by:

doEquals in class ScoreFunction

doHashCode

protected int doHashCode()

Specified by:

doHashCode in class ScoreFunction