org.apache.lucene.search.spans

Class SpanScorer

java.lang.Object

org.apache.lucene.search.Scorer

org.apache.lucene.search.spans.SpanScorer

public class SpanScorer
extends Scorer

A basic Scorer over Spans.

WARNING: This API is experimental and might change in incompatible ways in the next release.

Nested Class Summary

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

Scorer.ChildScorer

Field Summary

Fields

Modifier and Type	Field and Description
protected Similarity.SimScorer	docScorer
protected Spans	spans

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

weight

Constructor Summary

Constructors

Constructor and Description
SpanScorer(SpanWeight weight, Spans spans, Similarity.SimScorer docScorer) Sole constructor.

Method Summary

Modifier and Type	Method and Description
int	docID() Returns the doc ID that is currently being scored.
Spans	getSpans() return the Spans for this Scorer
DocIdSetIterator	iterator() Return a DocIdSetIterator over matching documents.
float	score() Returns the score of the current document matching the query.
protected float	scoreCurrentDoc() Score the current doc.
protected void	setFreqCurrentDoc() Sets freq and numMatches for the current document.
TwoPhaseIterator	twoPhaseIterator() Optional method: Return a TwoPhaseIterator view of this Scorer.

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

getChildren, getWeight

Methods inherited from class java.lang.Object

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

Field Detail

spans

protected final Spans spans

docScorer

protected final Similarity.SimScorer docScorer

Constructor Detail

SpanScorer

public SpanScorer(SpanWeight weight,
                  Spans spans,
                  Similarity.SimScorer docScorer)

Sole constructor.

Method Detail

getSpans

public Spans getSpans()

return the Spans for this Scorer

docID

public int docID()

Description copied from class: Scorer

Returns the doc ID that is currently being scored. This will return -1 if the Scorer.iterator() is not positioned or DocIdSetIterator.NO_MORE_DOCS if it has been entirely consumed.

Specified by:

docID in class Scorer

See Also:

DocIdSetIterator.docID()

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 and numMatches for the current document.

This will be called at most once per document.

Throws:

IOException

score

public final float score()
                  throws IOException

Description copied from class: Scorer

Returns the score of the current document matching the query. Initially invalid, until DocIdSetIterator.nextDoc() or DocIdSetIterator.advance(int) is called on the Scorer.iterator() the first time, or when called from within LeafCollector.collect(int).

Specified by:

score in class Scorer

Throws:

IOException