Package org.apache.lucene.search

Class ConjunctionUtils

java.lang.Object

org.apache.lucene.search.ConjunctionUtils

public final class ConjunctionUtils
extends Object

Helper methods for building conjunction iterators

Constructor Summary

Constructors

Constructor	Description
ConjunctionUtils()

Method Summary

Modifier and Type	Method	Description
static void	addIterator(DocIdSetIterator disi, List<DocIdSetIterator> allIterators, List<TwoPhaseIterator> twoPhaseIterators)	Given a DocIdSetIterator, find any sub-iterators or two-phase iterators and add them to the provided DocIdSetIterator and TwoPhaseIterator lists
static void	addTwoPhaseIterator(TwoPhaseIterator twoPhaseIter, List<DocIdSetIterator> allIterators, List<TwoPhaseIterator> twoPhaseIterators)	Given a two-phase iterator, find any sub-iterators and add them to the provided DocIdSetIterator and TwoPhaseIterator lists
static DocIdSetIterator	createConjunction(List<DocIdSetIterator> allIterators, List<TwoPhaseIterator> twoPhaseIterators)	Create a conjunction over the provided set of DocIdSetIterators and TwoPhaseIterators, using two-phase iterator where possible.
static DocIdSetIterator	intersectIterators(List<? extends DocIdSetIterator> iterators)	Create a conjunction over the provided DocIdSetIterators.
static DocIdSetIterator	intersectScorers(Collection<Scorer> scorers)	Create a conjunction over the provided Scorers.

Methods inherited from class java.lang.Object

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

Constructor Details

ConjunctionUtils

public ConjunctionUtils()

Method Details

intersectScorers

public static DocIdSetIterator intersectScorers(Collection<Scorer> scorers)

Create a conjunction over the provided Scorers. Note that the returned DocIdSetIterator might leverage two-phase iteration in which case it is possible to retrieve the TwoPhaseIterator using TwoPhaseIterator.unwrap(org.apache.lucene.search.DocIdSetIterator).

intersectIterators

public static DocIdSetIterator intersectIterators(List<? extends DocIdSetIterator> iterators)

Create a conjunction over the provided DocIdSetIterators. Note that the returned DocIdSetIterator might leverage two-phase iteration in which case it is possible to retrieve the TwoPhaseIterator using TwoPhaseIterator.unwrap(org.apache.lucene.search.DocIdSetIterator).

createConjunction

public static DocIdSetIterator createConjunction(List<DocIdSetIterator> allIterators,
 List<TwoPhaseIterator> twoPhaseIterators)

Create a conjunction over the provided set of DocIdSetIterators and TwoPhaseIterators, using two-phase iterator where possible. Note that the returned DocIdSetIterator might leverage two-phase iteration in which case it is possible to retrieve the TwoPhaseIterator using TwoPhaseIterator.unwrap(org.apache.lucene.search.DocIdSetIterator).

Parameters:

allIterators - a list of DocIdSetIterators to combine

twoPhaseIterators - a list of TwoPhaseIterators to combine

addTwoPhaseIterator

public static void addTwoPhaseIterator(TwoPhaseIterator twoPhaseIter,
 List<DocIdSetIterator> allIterators,
 List<TwoPhaseIterator> twoPhaseIterators)

Given a two-phase iterator, find any sub-iterators and add them to the provided DocIdSetIterator and TwoPhaseIterator lists

addIterator

public static void addIterator(DocIdSetIterator disi,
 List<DocIdSetIterator> allIterators,
 List<TwoPhaseIterator> twoPhaseIterators)

Given a DocIdSetIterator, find any sub-iterators or two-phase iterators and add them to the provided DocIdSetIterator and TwoPhaseIterator lists