gate.creole.annic.apache.lucene.search
Class BooleanScorer

java.lang.Object
  gate.creole.annic.apache.lucene.search.Scorer
      gate.creole.annic.apache.lucene.search.BooleanScorer

final class BooleanScorer
extends Scorer

Nested Class Summary

(package private) static class	BooleanScorer.Bucket
(package private) static class	BooleanScorer.BucketTable A simple hash table of document scores within a range.
(package private) static class	BooleanScorer.Collector
(package private) static class	BooleanScorer.SubScorer

Field Summary

private BooleanScorer.BucketTable	bucketTable
private float[]	coordFactors
private BooleanScorer.Bucket	current
private int	end
private int	maxCoord
private int	nextMask
private int	prohibitedMask
private int	requiredMask
private BooleanScorer.SubScorer	scorers

Fields inherited from class gate.creole.annic.apache.lucene.search.Scorer

searcher

Constructor Summary

BooleanScorer(Similarity similarity)

Method Summary

(package private) void	add(Scorer scorer, boolean required, boolean prohibited)
private void	computeCoordFactors()
int	doc() Returns the current document number.
Explanation	explain(int doc) Returns an explanation of the score for doc.
boolean	next(Searcher searcher) Advance to the next document matching the query.
float	score(Searcher searcher) Returns the score of the current document.
boolean	skipTo(int target) Skips to the first match beyond the current whose document number is greater than or equal to target.
String	toString()

Methods inherited from class gate.creole.annic.apache.lucene.search.Scorer

getSimilarity, score

Methods inherited from class java.lang.Object

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

Field Detail

scorers

private BooleanScorer.SubScorer scorers

bucketTable

private BooleanScorer.BucketTable bucketTable

maxCoord

private int maxCoord

coordFactors

private float[] coordFactors

requiredMask

private int requiredMask

prohibitedMask

private int prohibitedMask

nextMask

private int nextMask

end

private int end

current

private BooleanScorer.Bucket current

Constructor Detail

BooleanScorer

BooleanScorer(Similarity similarity)

Method Detail

add

final void add(Scorer scorer,
               boolean required,
               boolean prohibited)
        throws IOException

Throws:

IOException

computeCoordFactors

private final void computeCoordFactors()
                                throws IOException

Throws:

IOException

doc

public int doc()

Description copied from class: Scorer

Returns the current document number. Initially invalid, until #next() is called the first time.

Specified by:

doc in class Scorer

next

public boolean next(Searcher searcher)
             throws IOException

Description copied from class: Scorer

Advance to the next document matching the query. Returns true iff there is another match.

Specified by:

next in class Scorer

Throws:

IOException

score

public float score(Searcher searcher)
            throws IOException

Description copied from class: Scorer

Returns the score of the current document. Initially invalid, until #next() is called the first time.

Specified by:

score in class Scorer

Throws:

IOException

skipTo

public boolean skipTo(int target)
               throws IOException

Description copied from class: Scorer

Skips to the first match beyond the current whose document number is greater than or equal to target.

Returns true iff there is such a match.

Behaves as if written:

   boolean skipTo(int target) {
     do {
       if (!next())
             return false;
     } while (target > doc());
     return true;
   }
 

Most implementations are considerably more efficient than that.

Specified by:

skipTo in class Scorer

Throws:

IOException

explain

public Explanation explain(int doc)
                    throws IOException

Description copied from class: Scorer

Returns an explanation of the score for doc.

Specified by:

explain in class Scorer

Throws:

IOException

toString

public String toString()

Overrides:

toString in class Object