Module org.apache.lucene.queries

Package org.apache.lucene.queries.spans

Class SpanScorer

java.lang.Object

org.apache.lucene.search.Scorable

org.apache.lucene.search.Scorer

org.apache.lucene.queries.spans.SpanScorer

Direct Known Subclasses:

PayloadScoreQuery.PayloadSpanScorer

public class SpanScorer
extends Scorer

A basic Scorer over Spans.

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.lucene.search.Scorable

Scorable.ChildScorable

Field Summary

Fields

Modifier and Type	Field	Description
protected final LeafSimScorer	docScorer
private float	freq	accumulated sloppy freq (computed in setFreqCurrentDoc)
private int	lastScoredDoc
protected final Spans	spans

Fields inherited from class org.apache.lucene.search.Scorer

weight

Constructor Summary

Constructors

Constructor	Description
SpanScorer(SpanWeight weight, Spans spans, LeafSimScorer docScorer)	Sole constructor.

Method Summary

Modifier and Type	Method	Description
int	docID()	Returns the doc ID that is currently being scored.
private void	ensureFreq()	Ensure setFreqCurrentDoc is called, if not already called for the current doc.
float	getMaxScore(int upTo)	Return the maximum score that documents between the last target that this iterator was shallow-advanced to included and upTo included.
Spans	getSpans()	return the Spans for this Scorer *
DocIdSetIterator	iterator()	Return a DocIdSetIterator over matching documents.
final float	score()	Returns the score of the current document matching the query.
protected float	scoreCurrentDoc()	Score the current doc.
protected final void	setFreqCurrentDoc()	Sets freq for the current document.
(package private) final float	sloppyFreq()	Returns the intermediate "sloppy freq" adjusted for edit distance
TwoPhaseIterator	twoPhaseIterator()	Optional method: Return a TwoPhaseIterator view of this Scorer.

Methods inherited from class org.apache.lucene.search.Scorer

advanceShallow, getWeight

Methods inherited from class org.apache.lucene.search.Scorable

getChildren, setMinCompetitiveScore, smoothingScore

Methods inherited from class java.lang.Object

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

Field Details

spans

protected final Spans spans

docScorer

protected final LeafSimScorer docScorer

freq

private float freq

accumulated sloppy freq (computed in setFreqCurrentDoc)

lastScoredDoc

private int lastScoredDoc

Constructor Details

SpanScorer

public SpanScorer(SpanWeight weight,
 Spans spans,
 LeafSimScorer docScorer)

Sole constructor.

Method Details

getSpans

public Spans getSpans()

return the Spans for this Scorer *

docID

public int docID()

Description copied from class: Scorable

Returns the doc ID that is currently being scored.

Specified by:

docID in class Scorable

iterator

public DocIdSetIterator iterator()

Description copied from class: Scorer

Return a DocIdSetIterator 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.

Specified by:

iterator in class Scorer

twoPhaseIterator

public TwoPhaseIterator twoPhaseIterator()

Description copied from class: Scorer

Optional method: Return a TwoPhaseIterator view of this Scorer. A return value of null indicates that two-phase iteration is not supported.

Note that the returned TwoPhaseIterator's approximation must advance synchronously with the Scorer.iterator(): advancing the approximation must advance the iterator and vice-versa.

Implementing this method is typically useful on Scorers that have a high per-document overhead in order to confirm matches.

The default implementation returns null.

Overrides:

twoPhaseIterator in class Scorer

scoreCurrentDoc

protected float scoreCurrentDoc()
                         throws IOException

Score the current doc. The default implementation scores the doc with the similarity using the slop-adjusted freq.

Throws:

IOException

setFreqCurrentDoc

protected final void setFreqCurrentDoc()
                                throws IOException

Sets freq for the current document.

This will be called at most once per document.

Throws:

IOException

ensureFreq

private void ensureFreq()
                 throws IOException

Ensure setFreqCurrentDoc is called, if not already called for the current doc.

Throws:

IOException

score

public final float score()
                  throws IOException

Description copied from class: Scorable

Returns the score of the current document matching the query.

Specified by:

score in class Scorable

Throws:

IOException

getMaxScore

public float getMaxScore(int upTo)
                  throws IOException

Description copied from class: Scorer

Return the maximum score that documents between the last target that this iterator was shallow-advanced to included and upTo included.

Specified by:

getMaxScore in class Scorer

Throws:

IOException

sloppyFreq

final float sloppyFreq()
                throws IOException

Returns the intermediate "sloppy freq" adjusted for edit distance

Throws:

IOException