org.apache.lucene.search

Class ConstantScoreQuery.ConstantWeight

java.lang.Object

org.apache.lucene.search.Weight

org.apache.lucene.search.ConstantScoreQuery.ConstantWeight

Enclosing class:

ConstantScoreQuery

protected class ConstantScoreQuery.ConstantWeight
extends Weight

Constructor Summary

Constructors

Constructor and Description
ConstantScoreQuery.ConstantWeight(IndexSearcher searcher)

Method Summary

Methods

Modifier and Type	Method and Description
BulkScorer	bulkScorer(LeafReaderContext context, Bits acceptDocs) Optional method, to return a BulkScorer to score the query and send hits to a Collector.
Explanation	explain(LeafReaderContext context, int doc) An explanation of the score computation for the named document.
Query	getQuery() The query that this concerns.
float	getValueForNormalization() The value for normalization of contained query clauses (e.g.
void	normalize(float norm, float topLevelBoost) Assigns the query normalization factor and boost from parent queries to this.
Scorer	scorer(LeafReaderContext context, Bits acceptDocs) Returns a Scorer which scores documents in/out-of order according to scoreDocsInOrder.

Methods inherited from class java.lang.Object

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

Constructor Detail

ConstantScoreQuery.ConstantWeight

public ConstantScoreQuery.ConstantWeight(IndexSearcher searcher)
                                  throws IOException

Throws:

IOException

Method Detail

getQuery

public Query getQuery()

Description copied from class: Weight

The query that this concerns.

Specified by:

getQuery in class Weight

getValueForNormalization

public float getValueForNormalization()
                               throws IOException

Description copied from class: Weight

The value for normalization of contained query clauses (e.g. sum of squared weights).

Specified by:

getValueForNormalization in class Weight

Throws:

IOException

normalize

public void normalize(float norm,
             float topLevelBoost)

Description copied from class: Weight

Assigns the query normalization factor and boost from parent queries to this.

Specified by:

normalize in class Weight

bulkScorer

public BulkScorer bulkScorer(LeafReaderContext context,
                    Bits acceptDocs)
                      throws IOException

Description copied from class: Weight

Optional method, to return a BulkScorer to score the query and send hits to a Collector. Only queries that have a different top-level approach need to override this; the default implementation pulls a normal Scorer and iterates and collects the resulting hits.

Overrides:

bulkScorer in class Weight

Parameters:

context - the LeafReaderContext for which to return the Scorer.

acceptDocs - Bits that represent the allowable docs to match (typically deleted docs but possibly filtering other documents)

Returns:

a BulkScorer which scores documents and passes them to a collector.

Throws:

IOException - if there is a low-level I/O error

scorer

public Scorer scorer(LeafReaderContext context,
            Bits acceptDocs)
              throws IOException

Description copied from class: Weight

Returns a Scorer which scores documents in/out-of order according to scoreDocsInOrder.

NOTE: null can be returned if no documents will be scored by this query.

Specified by:

scorer in class Weight

Parameters:

context - the LeafReaderContext for which to return the Scorer.

acceptDocs - Bits that represent the allowable docs to match (typically deleted docs but possibly filtering other documents)

Returns:

a Scorer which scores documents in/out-of order.

Throws:

IOException - if there is a low-level I/O error

explain

public Explanation explain(LeafReaderContext context,
                  int doc)
                    throws IOException

Description copied from class: Weight

An explanation of the score computation for the named document.

Specified by:

explain in class Weight

Parameters:

context - the readers context to create the Explanation for.

doc - the document's id relative to the given context's reader

Returns:

an Explanation for the score

Throws:

IOException - if an IOException occurs