org.apache.lucene.search.spans
Class SpanScorer

java.lang.Object
  extended by org.apache.lucene.search.DocIdSetIterator
      extended by org.apache.lucene.search.Scorer
          extended by 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 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 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:

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


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