Package org.apache.lucene.search.join
Class ToParentBlockJoinQuery.ParentTwoPhase
- java.lang.Object
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- org.apache.lucene.search.TwoPhaseIterator
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- org.apache.lucene.search.join.ToParentBlockJoinQuery.ParentTwoPhase
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- Enclosing class:
- ToParentBlockJoinQuery
private static class ToParentBlockJoinQuery.ParentTwoPhase extends TwoPhaseIterator
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Field Summary
Fields Modifier and Type Field Description private DocIdSetIterator
childApproximation
private TwoPhaseIterator
childTwoPhase
private ToParentBlockJoinQuery.ParentApproximation
parentApproximation
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Fields inherited from class org.apache.lucene.search.TwoPhaseIterator
approximation
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Constructor Summary
Constructors Constructor Description ParentTwoPhase(ToParentBlockJoinQuery.ParentApproximation parentApproximation, TwoPhaseIterator childTwoPhase)
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description float
matchCost()
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 Detail
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parentApproximation
private final ToParentBlockJoinQuery.ParentApproximation parentApproximation
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childApproximation
private final DocIdSetIterator childApproximation
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childTwoPhase
private final TwoPhaseIterator childTwoPhase
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Constructor Detail
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ParentTwoPhase
ParentTwoPhase(ToParentBlockJoinQuery.ParentApproximation parentApproximation, TwoPhaseIterator childTwoPhase)
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Method Detail
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matches
public boolean matches() throws java.io.IOException
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:
java.io.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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