Package org.apache.lucene.search

Class MaxScoreSumPropagator

java.lang.Object

org.apache.lucene.search.MaxScoreSumPropagator

final class MaxScoreSumPropagator
extends Object

Utility class to propagate scoring information in BooleanQuery, which compute the score as the sum of the scores of its matching clauses. This helps propagate information about the maximum produced score

Field Summary

Fields

Modifier and Type	Field	Description
private final int	numClauses
private final Scorer[]	scorers
private final double[]	sumOfOtherMaxScores

Constructor Summary

Constructors

Constructor	Description
MaxScoreSumPropagator(Collection<? extends Scorer> scorerList)

Method Summary

Modifier and Type	Method	Description
(package private) void	advanceShallow(int target)
private static double[]	computeSumOfComplement(float[] v)	Return an array which, at index i, stores the sum of all entries of v except the one at index i.
(package private) float	getMaxScore(int upTo)
private float	getMinCompetitiveScore(float minScoreSum, double sumOfOtherMaxScores)	Return the minimum score that a Scorer must produce in order for a hit to be competitive.
private float	scoreSumUpperBound(double sum)
(package private) void	setMinCompetitiveScore(float minScore)

Methods inherited from class java.lang.Object

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

Field Details

numClauses

private final int numClauses

scorers

private final Scorer[] scorers

sumOfOtherMaxScores

private final double[] sumOfOtherMaxScores

Constructor Details

MaxScoreSumPropagator

MaxScoreSumPropagator(Collection<? extends Scorer> scorerList)
               throws IOException

Throws:

IOException

Method Details

computeSumOfComplement

private static double[] computeSumOfComplement(float[] v)

Return an array which, at index i, stores the sum of all entries of v except the one at index i.

advanceShallow

void advanceShallow(int target)
             throws IOException

Throws:

IOException

getMaxScore

float getMaxScore(int upTo)
           throws IOException

Throws:

IOException

setMinCompetitiveScore

void setMinCompetitiveScore(float minScore)
                     throws IOException

Throws:

IOException

getMinCompetitiveScore

private float getMinCompetitiveScore(float minScoreSum,
 double sumOfOtherMaxScores)

Return the minimum score that a Scorer must produce in order for a hit to be competitive.

scoreSumUpperBound

private float scoreSumUpperBound(double sum)