org.elasticsearch.index.query.functionscore

Class DecayFunctionParser.AbstractDistanceScoreFunction

java.lang.Object

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

org.elasticsearch.index.query.functionscore.DecayFunctionParser.AbstractDistanceScoreFunction

Enclosing class:

DecayFunctionParser

public abstract static class DecayFunctionParser.AbstractDistanceScoreFunction
extends ScoreFunction

This is the base class for scoring a single field.

Field Summary

Fields

Modifier and Type	Field and Description
protected MultiValueMode	mode
protected double	offset

Constructor Summary

Constructors

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

Method Summary

Modifier and Type	Method and Description
protected abstract NumericDoubleValues	distance(org.apache.lucene.index.LeafReaderContext context) This function computes the distance from a defined origin.
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

getDefaultScoreCombiner, needsScores

Methods inherited from class java.lang.Object

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

Field Detail

offset

protected final double offset

mode

protected final MultiValueMode mode

Constructor Detail

AbstractDistanceScoreFunction

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

Method Detail

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)

getFieldName

protected abstract String getFieldName()