Scorer
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Nested Class Summary
Nested classes/interfaces inherited from class org.apache.lucene.search.Scorable
Scorable.ChildScorable
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Field Summary
FieldsModifier and TypeFieldDescriptionprivate static final int
Estimation of the number of operations required to call DISI.advance.private final DocIdSetIterator
private final TwoPhaseIterator
private final DocIdSetIterator
private final Scorer
private final TwoPhaseIterator
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Constructor Summary
ConstructorsConstructorDescriptionReqExclScorer
(Scorer reqScorer, Scorer exclScorer) Construct aReqExclScorer
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Method Summary
Modifier and TypeMethodDescriptionint
advanceShallow
(int target) Advance to the block of documents that containstarget
in order to get scoring information about this block.int
docID()
Returns the doc ID that is currently being scored.Returns child sub-scorers positioned on the current documentfloat
getMaxScore
(int upTo) Return the maximum score that documents between the lasttarget
that this iterator wasshallow-advanced
to included andupTo
included.iterator()
Return aDocIdSetIterator
over matching documents.private static float
matchCost
(DocIdSetIterator reqApproximation, TwoPhaseIterator reqTwoPhaseIterator, DocIdSetIterator exclApproximation, TwoPhaseIterator exclTwoPhaseIterator) private static boolean
Confirms whether or not the givenTwoPhaseIterator
matches on the current document.float
score()
Returns the score of the current document matching the query.void
setMinCompetitiveScore
(float score) Optional method: Tell the scorer that its iterator may safely ignore all documents whose score is less than the givenminScore
.Optional method: Return aTwoPhaseIterator
view of thisScorer
.Methods inherited from class org.apache.lucene.search.Scorable
smoothingScore
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Field Details
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reqScorer
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reqApproximation
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exclApproximation
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reqTwoPhaseIterator
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exclTwoPhaseIterator
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ADVANCE_COST
private static final int ADVANCE_COSTEstimation of the number of operations required to call DISI.advance. This is likely completely wrong, especially given that the cost of this method usually depends on how far you want to advance, but it's probably better than nothing.- See Also:
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Constructor Details
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ReqExclScorer
Construct aReqExclScorer
.- Parameters:
reqScorer
- The scorer that must match, except whereexclScorer
- indicates exclusion.
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Method Details
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matchesOrNull
Confirms whether or not the givenTwoPhaseIterator
matches on the current document.- Throws:
IOException
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iterator
Description copied from class:Scorer
Return aDocIdSetIterator
over matching documents.The returned iterator will either be positioned on
-1
if no documents have been scored yet,DocIdSetIterator.NO_MORE_DOCS
if all documents have been scored already, or the last document id that has been scored otherwise.The returned iterator is a view: calling this method several times will return iterators that have the same state.
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docID
public int docID()Description copied from class:Scorer
Returns the doc ID that is currently being scored. -
score
Description copied from class:Scorable
Returns the score of the current document matching the query.- Specified by:
score
in classScorable
- Throws:
IOException
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advanceShallow
Description copied from class:Scorer
Advance to the block of documents that containstarget
in order to get scoring information about this block. This method is implicitly called byDocIdSetIterator.advance(int)
andDocIdSetIterator.nextDoc()
on the returned doc ID. Calling this method doesn't modify the currentDocIdSetIterator.docID()
. It returns a number that is greater than or equal to all documents contained in the current block, but less than any doc IDS of the next block.target
must be >=Scorer.docID()
as well as all targets that have been passed toScorer.advanceShallow(int)
so far.- Overrides:
advanceShallow
in classScorer
- Throws:
IOException
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getMaxScore
Description copied from class:Scorer
Return the maximum score that documents between the lasttarget
that this iterator wasshallow-advanced
to included andupTo
included.- Specified by:
getMaxScore
in classScorer
- Throws:
IOException
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setMinCompetitiveScore
Description copied from class:Scorable
Optional method: Tell the scorer that its iterator may safely ignore all documents whose score is less than the givenminScore
. This is a no-op by default.This method may only be called from collectors that use
ScoreMode.TOP_SCORES
, and successive calls may only set increasing values ofminScore
.- Overrides:
setMinCompetitiveScore
in classScorable
- Throws:
IOException
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getChildren
Description copied from class:Scorable
Returns child sub-scorers positioned on the current document- Overrides:
getChildren
in classScorable
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matchCost
private static float matchCost(DocIdSetIterator reqApproximation, TwoPhaseIterator reqTwoPhaseIterator, DocIdSetIterator exclApproximation, TwoPhaseIterator exclTwoPhaseIterator) -
twoPhaseIterator
Description copied from class:Scorer
Optional method: Return aTwoPhaseIterator
view of thisScorer
. A return value ofnull
indicates that two-phase iteration is not supported.Note that the returned
TwoPhaseIterator
'sapproximation
must advance synchronously with theScorer.iterator()
: advancing the approximation must advance the iterator and vice-versa.Implementing this method is typically useful on
Scorer
s that have a high per-document overhead in order to confirm matches.The default implementation returns
null
.- Overrides:
twoPhaseIterator
in classScorer
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