Package org.apache.lucene.search
Class ConjunctionDISI.ConjunctionTwoPhaseIterator
java.lang.Object
org.apache.lucene.search.TwoPhaseIterator
org.apache.lucene.search.ConjunctionDISI.ConjunctionTwoPhaseIterator
- Enclosing class:
- ConjunctionDISI
TwoPhaseIterator
implementing a conjunction.-
Field Summary
FieldsFields inherited from class org.apache.lucene.search.TwoPhaseIterator
approximation
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Constructor Summary
ConstructorsModifierConstructorDescriptionprivate
ConjunctionTwoPhaseIterator
(DocIdSetIterator approximation, List<? extends TwoPhaseIterator> twoPhaseIterators) -
Method Summary
Modifier and TypeMethodDescriptionfloat
An estimate of the expected cost to determine that a single documentTwoPhaseIterator.matches()
.boolean
matches()
Return whether the current doc ID thatTwoPhaseIterator.approximation()
is on matches.Methods inherited from class org.apache.lucene.search.TwoPhaseIterator
approximation, asDocIdSetIterator, unwrap
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Field Details
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twoPhaseIterators
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matchCost
private final float matchCost
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Constructor Details
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ConjunctionTwoPhaseIterator
private ConjunctionTwoPhaseIterator(DocIdSetIterator approximation, List<? extends TwoPhaseIterator> twoPhaseIterators)
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Method Details
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matches
Description copied from class:TwoPhaseIterator
Return whether the current doc ID thatTwoPhaseIterator.approximation()
is on matches. This method should only be called when the iterator is positioned -- ie. not whenDocIdSetIterator.docID()
is-1
orDocIdSetIterator.NO_MORE_DOCS
-- and at most once.- Specified by:
matches
in classTwoPhaseIterator
- Throws:
IOException
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matchCost
public float matchCost()Description copied from class:TwoPhaseIterator
An estimate of the expected cost to determine that a single documentTwoPhaseIterator.matches()
. This can be called before iterating the documents ofTwoPhaseIterator.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 classTwoPhaseIterator
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