org.apache.lucene.search

Class ReqExclScorer

java.lang.Object

org.apache.lucene.search.Scorer

org.apache.lucene.search.ReqExclScorer

public class ReqExclScorer
extends Scorer

A Scorer for queries with a required subscorer and an excluding (prohibited) subscorer.
This Scorer implements Scorer.skipTo(int), and it uses the skipTo() on the given scorers.

Constructor Summary

Constructors

Constructor and Description
ReqExclScorer(Scorer reqScorer, Scorer exclScorer) Construct a ReqExclScorer.

Method Summary

Methods

Modifier and Type	Method and Description
int	doc() Returns the current document number matching the query.
Explanation	explain(int doc) Returns an explanation of the score for a document.
boolean	next() Advances to the next document matching the query.
float	score() Returns the score of the current document matching the query.
boolean	skipTo(int target) Skips to the first match beyond the current whose document number is greater than or equal to a given target.

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

getSimilarity, score, score

Methods inherited from class java.lang.Object

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

Constructor Detail

ReqExclScorer

public ReqExclScorer(Scorer reqScorer,
             Scorer exclScorer)

Construct a ReqExclScorer.

Parameters:

reqScorer - The scorer that must match, except where

exclScorer - indicates exclusion.

Method Detail

next

public boolean next()
             throws IOException

Description copied from class: Scorer

Advances to the next document matching the query.

Specified by:

next in class Scorer

Returns:

true iff there is another document matching the query.
When this method is used the Scorer.explain(int) method should not be used.

Throws:

IOException

doc

public int doc()

Description copied from class: Scorer

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

Specified by:

doc in class Scorer

score

public float score()
            throws IOException

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

Specified by:

score in class Scorer

Returns:

The score of the required scorer.

Throws:

IOException

skipTo

public boolean skipTo(int target)
               throws IOException

Skips to the first match beyond the current whose document number is greater than or equal to a given target.
When this method is used the explain(int) method should not be used.

Specified by:

skipTo in class Scorer

Parameters:

target - The target document number.

Returns:

true iff there is such a match.

Throws:

IOException

explain

public Explanation explain(int doc)
                    throws IOException

Description copied from class: Scorer

Returns an explanation of the score for a document.
When this method is used, the Scorer.next(), Scorer.skipTo(int) and Scorer.score(HitCollector) methods should not be used.

Specified by:

explain in class Scorer

Parameters:

doc - The document number for the explanation.

Throws:

IOException