Package org.apache.lucene.search

Class DisjunctionScorer.TwoPhase

java.lang.Object

org.apache.lucene.search.TwoPhaseIterator

org.apache.lucene.search.DisjunctionScorer.TwoPhase

Enclosing class:

DisjunctionScorer

private class DisjunctionScorer.TwoPhase
extends TwoPhaseIterator

Field Summary

Fields

Modifier and Type	Field	Description
private float	matchCost
(package private) PriorityQueue<DisiWrapper>	unverifiedMatches
(package private) DisiWrapper	verifiedMatches

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

approximation

Constructor Summary

Constructors

Modifier	Constructor	Description
private	TwoPhase(DocIdSetIterator approximation, float matchCost)

Method Summary

Modifier and Type	Method	Description
(package private) DisiWrapper	getSubMatches()
float	matchCost()	An estimate of the expected cost to determine that a single document TwoPhaseIterator.matches().
boolean	matches()	Return whether the current doc ID that TwoPhaseIterator.approximation() is on matches.

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

approximation, asDocIdSetIterator, unwrap

Methods inherited from class java.lang.Object

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

Field Detail

matchCost

private final float matchCost

verifiedMatches

DisiWrapper verifiedMatches

unverifiedMatches

final PriorityQueue<DisiWrapper> unverifiedMatches

Constructor Detail

TwoPhase

private TwoPhase(DocIdSetIterator approximation,
                 float matchCost)

Method Detail

getSubMatches

DisiWrapper getSubMatches()
                   throws java.io.IOException

Throws:

java.io.IOException

matches

public boolean matches()
                throws java.io.IOException

Description copied from class: TwoPhaseIterator

Return whether the current doc ID that TwoPhaseIterator.approximation() is on matches. This method should only be called when the iterator is positioned -- ie. not when DocIdSetIterator.docID() is -1 or DocIdSetIterator.NO_MORE_DOCS -- and at most once.

Specified by:

matches in class TwoPhaseIterator

Throws:

java.io.IOException

matchCost

public float matchCost()

Description copied from class: TwoPhaseIterator

An estimate of the expected cost to determine that a single document TwoPhaseIterator.matches(). This can be called before iterating the documents of TwoPhaseIterator.approximation(). Returns an expected cost in number of simple operations like addition, multiplication, comparing two numbers and indexing an array. The returned value must be positive.

Specified by:

matchCost in class TwoPhaseIterator