org.apache.lucene.search

Class DisjunctionMaxScorer

java.lang.Object

org.apache.lucene.search.Scorer

org.apache.lucene.search.DisjunctionScorer

org.apache.lucene.search.DisjunctionMaxScorer

final class DisjunctionMaxScorer
extends DisjunctionScorer

The Scorer for DisjunctionMaxQuery. The union of all documents generated by the the subquery scorers is generated in document number order. The score for each document is the maximum of the scores computed by the subquery scorers that generate that document, plus tieBreakerMultiplier times the sum of the scores for the other subqueries that generate the document.

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.lucene.search.Scorer

Scorer.ChildScorer

Field Summary

Fields

Modifier and Type	Field and Description
private float	tieBreakerMultiplier

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

weight

Constructor Summary

Constructors

Constructor and Description
DisjunctionMaxScorer(Weight weight, float tieBreakerMultiplier, java.util.List<Scorer> subScorers, boolean needsScores) Creates a new instance of DisjunctionMaxScorer

Method Summary

Modifier and Type	Method and Description
protected float	score(DisiWrapper topList) Compute the score for the given linked list of scorers.

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

docID, freq, getChildren, getSubMatches, iterator, score, twoPhaseIterator

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

getWeight

Methods inherited from class java.lang.Object

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

Field Detail

tieBreakerMultiplier

private final float tieBreakerMultiplier

Constructor Detail

DisjunctionMaxScorer

DisjunctionMaxScorer(Weight weight,
                     float tieBreakerMultiplier,
                     java.util.List<Scorer> subScorers,
                     boolean needsScores)

Creates a new instance of DisjunctionMaxScorer

Parameters:

weight - The Weight to be used.

tieBreakerMultiplier - Multiplier applied to non-maximum-scoring subqueries for a document as they are summed into the result.

subScorers - The sub scorers this Scorer should iterate on

Method Detail

score

protected float score(DisiWrapper topList)
               throws java.io.IOException

Description copied from class: DisjunctionScorer

Compute the score for the given linked list of scorers.

Specified by:

score in class DisjunctionScorer

Throws:

java.io.IOException