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.ChildScorer

Field Summary

protected int	doc
protected Similarity.SloppySimScorer	docScorer
protected float	freq
protected boolean	more
protected Spans	spans

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.SloppySimScorer docScorer)

Method Summary

int	advance(int target) Advances to the first beyond the current whose document number is greater than or equal to target, and returns the document number itself.
int	docID() Returns the following: -1 or DocIdSetIterator.NO_MORE_DOCS if DocIdSetIterator.nextDoc() or DocIdSetIterator.advance(int) were not called yet.
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

getChildren, getWeight, score, score

Methods inherited from class java.lang.Object

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

Field Detail

spans

protected Spans spans

more

protected boolean more

doc

protected int doc

freq

protected float freq

docScorer

protected final Similarity.SloppySimScorer docScorer

Constructor Detail

SpanScorer

protected SpanScorer(Spans spans,
                     Weight weight,
                     Similarity.SloppySimScorer docScorer)
              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 the current whose document number is greater than or equal to target, and returns the document number itself. Exhausts the iterator and returns DocIdSetIterator.NO_MORE_DOCS if target is greater than the highest document number in the set.

The behavior of this method is undefined when called with target ≤ current, or after the iterator has exhausted. Both cases may result in unpredicted behavior.

When target > current it 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: 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.

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.

Specified by:

freq in class Scorer

Throws:

IOException