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

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

final class ConjunctionScorer
extends Scorer

Scorer for conjunctions, sets of queries, all of which are required.

Field Summary

private float	coord
private boolean	firstTime
private boolean	more
private LinkedList	scorers

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

searcher

Constructor Summary

ConjunctionScorer(Similarity similarity)

Method Summary

(package private) void	add(Scorer scorer)
int	doc() Returns the current document number.
private boolean	doNext()
Explanation	explain(int doc) Returns an explanation of the score for doc.
private Scorer	first()
private void	init()
private Scorer	last()
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.
private void	sortScorers()

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, toString, wait, wait, wait

Field Detail

scorers

private LinkedList scorers

firstTime

private boolean firstTime

more

private boolean more

coord

private float coord

Constructor Detail

ConjunctionScorer

public ConjunctionScorer(Similarity similarity)

Method Detail

add

final void add(Scorer scorer)
        throws IOException

Throws:

IOException

first

private Scorer first()

last

private Scorer last()

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

doNext

private boolean doNext()
                throws IOException

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

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

init

private void init()
           throws IOException

Throws:

IOException

sortScorers

private void sortScorers()
                  throws IOException

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