org.apache.lucene.search.spans
Class SpanScorer

java.lang.Object
  org.apache.lucene.search.DocIdSetIterator
      org.apache.lucene.search.Scorer
          org.apache.lucene.search.spans.SpanScorer

Direct Known Subclasses:

PayloadNearQuery.PayloadNearSpanScorer, PayloadTermQuery.PayloadTermWeight.PayloadTermSpanScorer

public class SpanScorer
extends Scorer

Public for extension only.

Nested Class Summary

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

Scorer.ScorerVisitor<P extends Query,C extends Query,S extends Scorer>

Field Summary

protected int	doc
protected float	freq
protected boolean	more
protected byte[]	norms
protected Spans	spans
protected float	value

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

weight

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

NO_MORE_DOCS

Constructor Summary

protected

SpanScorer(Spans spans, Weight weight, Similarity similarity, byte[] norms)

Method Summary

int	advance(int target) Advances to the first beyond (see NOTE below) the current whose document number is greater than or equal to target.
int	docID() Returns the following: -1 or DocIdSetIterator.NO_MORE_DOCS if DocIdSetIterator.nextDoc() or DocIdSetIterator.advance(int) were not called yet.
protected Explanation	explain(int doc) This method is no longer an official member of Scorer, but it is needed by SpanWeight to build an explanation.
float	freq() Returns number of matches for the current document.
int	nextDoc() Advances to the next document in the set and returns the doc it is currently on, or DocIdSetIterator.NO_MORE_DOCS if there are no more docs in the set. NOTE: after the iterator has exhausted you should not call this method, as it may result in unpredicted behavior.
float	score() Returns the score of the current document matching the query.
protected boolean	setFreqCurrentDoc()

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

getSimilarity, score, score, visitScorers, visitSubScorers

Methods inherited from class java.lang.Object

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

Field Detail

spans

protected Spans spans

norms

protected byte[] norms

value

protected float value

more

protected boolean more

doc

protected int doc

freq

protected float freq

Constructor Detail

SpanScorer

protected SpanScorer(Spans spans,
                     Weight weight,
                     Similarity similarity,
                     byte[] norms)
              throws IOException

Throws:

IOException

Method Detail

nextDoc

public int nextDoc()
            throws IOException

Description copied from class: DocIdSetIterator

Advances to the next document in the set and returns the doc it is currently on, or DocIdSetIterator.NO_MORE_DOCS if there are no more docs in the set.
NOTE: after the iterator has exhausted you should not call this method, as it may result in unpredicted behavior.

Specified by:

nextDoc in class DocIdSetIterator

Throws:

IOException

advance

public int advance(int target)
            throws IOException

Description copied from class: DocIdSetIterator

Advances to the first beyond (see NOTE below) the current whose document number is greater than or equal to target. Returns the current document number or DocIdSetIterator.NO_MORE_DOCS if there are no more docs in the set.

Behaves as if written:

 int advance(int target) {
   int doc;
   while ((doc = nextDoc()) < target) {
   }
   return doc;
 }
 

Some implementations are considerably more efficient than that.

NOTE: when target ≤ current implementations may opt not to advance beyond their current DocIdSetIterator.docID().

NOTE: this method may be called with DocIdSetIterator.NO_MORE_DOCS for efficiency by some Scorers. If your implementation cannot efficiently determine that it should exhaust, it is recommended that you check for that value in each call to this method.

NOTE: after the iterator has exhausted you should not call this method, as it may result in unpredicted behavior.

Specified by:

advance in class DocIdSetIterator

Throws:

IOException

setFreqCurrentDoc

protected boolean setFreqCurrentDoc()
                             throws IOException

Throws:

IOException

docID

public int docID()

Description copied from class: DocIdSetIterator

Returns the following:

• -1 or DocIdSetIterator.NO_MORE_DOCS if DocIdSetIterator.nextDoc() or DocIdSetIterator.advance(int) were not called yet.
• DocIdSetIterator.NO_MORE_DOCS if the iterator has exhausted.
• Otherwise it should return the doc ID it is currently on.

Specified by:

docID in class DocIdSetIterator

score

public 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 the first time, or when called from within Collector.collect(int).

Specified by:

score in class Scorer

Throws:

IOException

freq

public float freq()
           throws IOException

Description copied from class: Scorer

Returns number of matches for the current document. This returns a float (not int) because SloppyPhraseScorer discounts its freq according to how "sloppy" the match was.

Overrides:

freq in class Scorer

Throws:

IOException

explain

protected Explanation explain(int doc)
                       throws IOException

This method is no longer an official member of Scorer, but it is needed by SpanWeight to build an explanation.

Throws:

IOException