org.apache.lucene.search.spans

Class SpanWeight

java.lang.Object

org.apache.lucene.search.Weight

org.apache.lucene.search.spans.SpanWeight

Direct Known Subclasses:

PayloadNearQuery.PayloadNearSpanWeight, PayloadTermQuery.PayloadTermWeight

public class SpanWeight
extends Weight

Expert-only. Public for use by other weight implementations

Field Summary

Fields

Modifier and Type	Field and Description
protected SpanQuery	query
protected Similarity	similarity
protected Similarity.SimWeight	stats
protected Map<Term,TermContext>	termContexts

Constructor Summary

Constructors

Constructor and Description
SpanWeight(SpanQuery query, IndexSearcher searcher)

Method Summary

Methods

Modifier and Type	Method and Description
Explanation	explain(AtomicReaderContext 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 queryNorm, float topLevelBoost) Assigns the query normalization factor and boost from parent queries to this.
Scorer	scorer(AtomicReaderContext context, Bits acceptDocs) Returns a Scorer which scores documents in/out-of order according to scoreDocsInOrder.

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

bulkScorer, scoresDocsOutOfOrder

Methods inherited from class java.lang.Object

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

Field Detail

similarity

protected Similarity similarity

termContexts

protected Map<Term,TermContext> termContexts

query

protected SpanQuery query

stats

protected Similarity.SimWeight stats

Constructor Detail

SpanWeight

public SpanWeight(SpanQuery query,
          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 queryNorm,
             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

scorer

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

Description copied from class: Weight

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

NOTE: even if scoreDocsInOrder is false, it is recommended to check whether the returned Scorer indeed scores documents out of order (i.e., call Weight.scoresDocsOutOfOrder()), as some Scorer implementations will always return documents in-order.
NOTE: null can be returned if no documents will be scored by this query.

Specified by:

scorer in class Weight

Parameters:

context - the AtomicReaderContext 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(AtomicReaderContext 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