org.apache.lucene.search

Class Boolean2ScorerSupplier

java.lang.Object

org.apache.lucene.search.ScorerSupplier

org.apache.lucene.search.Boolean2ScorerSupplier

final class Boolean2ScorerSupplier
extends ScorerSupplier

Field Summary

Fields

Modifier and Type	Field and Description
private long	cost
private int	minShouldMatch
private boolean	needsScores
private java.util.Map<BooleanClause.Occur,java.util.Collection<ScorerSupplier>>	subs
private BooleanWeight	weight

Constructor Summary

Constructors

Constructor and Description
Boolean2ScorerSupplier(BooleanWeight weight, java.util.Map<BooleanClause.Occur,java.util.Collection<ScorerSupplier>> subs, boolean needsScores, int minShouldMatch)

Method Summary

Modifier and Type	Method and Description
private long	computeCost()
long	cost() Get an estimate of the Scorer that would be returned by ScorerSupplier.get(long).
private Scorer	excl(Scorer main, java.util.Collection<ScorerSupplier> prohibited, long leadCost)
Scorer	get(long leadCost) Get the Scorer.
private Scorer	opt(java.util.Collection<ScorerSupplier> optional, int minShouldMatch, boolean needsScores, long leadCost)
private Scorer	req(java.util.Collection<ScorerSupplier> requiredNoScoring, java.util.Collection<ScorerSupplier> requiredScoring, long leadCost) Create a new scorer for the given required clauses.

Methods inherited from class java.lang.Object

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

Field Detail

weight

private final BooleanWeight weight

subs

private final java.util.Map<BooleanClause.Occur,java.util.Collection<ScorerSupplier>> subs

needsScores

private final boolean needsScores

minShouldMatch

private final int minShouldMatch

cost

private long cost

Constructor Detail

Boolean2ScorerSupplier

Boolean2ScorerSupplier(BooleanWeight weight,
                       java.util.Map<BooleanClause.Occur,java.util.Collection<ScorerSupplier>> subs,
                       boolean needsScores,
                       int minShouldMatch)

Method Detail

computeCost

private long computeCost()

cost

public long cost()

Description copied from class: ScorerSupplier

Get an estimate of the Scorer that would be returned by ScorerSupplier.get(long). This may be a costly operation, so it should only be called if necessary.

Specified by:

cost in class ScorerSupplier

See Also:

DocIdSetIterator.cost()

get

public Scorer get(long leadCost)
           throws java.io.IOException

Description copied from class: ScorerSupplier

Get the Scorer. This may not return null and must be called at most once.

Specified by:

get in class ScorerSupplier

Parameters:

leadCost - Cost of the scorer that will be used in order to lead iteration. This can be interpreted as an upper bound of the number of times that DocIdSetIterator.nextDoc(), DocIdSetIterator.advance(int) and TwoPhaseIterator.matches() will be called. Under doubt, pass Long.MAX_VALUE, which will produce a Scorer that has good iteration capabilities.

Throws:

java.io.IOException

req

private Scorer req(java.util.Collection<ScorerSupplier> requiredNoScoring,
                   java.util.Collection<ScorerSupplier> requiredScoring,
                   long leadCost)
            throws java.io.IOException

Create a new scorer for the given required clauses. Note that requiredScoring is a subset of required containing required clauses that should participate in scoring.

Throws:

java.io.IOException

excl

private Scorer excl(Scorer main,
                    java.util.Collection<ScorerSupplier> prohibited,
                    long leadCost)
             throws java.io.IOException

Throws:

java.io.IOException

opt

private Scorer opt(java.util.Collection<ScorerSupplier> optional,
                   int minShouldMatch,
                   boolean needsScores,
                   long leadCost)
            throws java.io.IOException

Throws:

java.io.IOException