Package org.apache.lucene.queries.spans

Class SpanWeight

java.lang.Object

org.apache.lucene.search.Weight

org.apache.lucene.queries.spans.SpanWeight

All Implemented Interfaces:

SegmentCacheable

Direct Known Subclasses:

org.apache.lucene.queries.spans.SpanContainQuery.SpanContainWeight, SpanNearQuery.SpanNearWeight, SpanNotQuery.SpanNotWeight, SpanOrQuery.SpanOrWeight, SpanPayloadCheckQuery.SpanPayloadCheckWeight, SpanPositionCheckQuery.SpanPositionCheckWeight, SpanTermQuery.SpanTermWeight

public abstract class SpanWeight
extends Weight

Expert-only. Public for use by other weight implementations

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	SpanWeight.Postings	Enumeration defining what postings information should be retrieved from the index for a given Spans

Nested classes/interfaces inherited from class org.apache.lucene.search.Weight

Weight.DefaultBulkScorer

Field Summary

Fields

Modifier and Type	Field	Description
protected String	field
protected Similarity	similarity
protected Similarity.SimScorer	simScorer

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

parentQuery

Constructor Summary

Constructors

Constructor	Description
SpanWeight(SpanQuery query, IndexSearcher searcher, Map<Term,TermStates> termStates, float boost)	Create a new SpanWeight

Method Summary

Modifier and Type	Method	Description
Explanation	explain(LeafReaderContext context, int doc)
abstract void	extractTermStates(Map<Term,TermStates> contexts)	Collect all TermStates used by this Weight
LeafSimScorer	getSimScorer(LeafReaderContext context)	Return a LeafSimScorer for this context
abstract Spans	getSpans(LeafReaderContext ctx, SpanWeight.Postings requiredPostings)	Expert: Return a Spans object iterating over matches from this Weight
Matches	matches(LeafReaderContext context, int doc)
SpanScorer	scorer(LeafReaderContext context)

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

bulkScorer, count, getQuery, scorerSupplier

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.lucene.search.SegmentCacheable

isCacheable

Field Detail

similarity

protected final Similarity similarity

simScorer

protected final Similarity.SimScorer simScorer

field

protected final String field

Constructor Detail

SpanWeight

public SpanWeight(SpanQuery query,
                  IndexSearcher searcher,
                  Map<Term,TermStates> termStates,
                  float boost)
           throws IOException

Create a new SpanWeight

Parameters:

query - the parent query

searcher - the IndexSearcher to query against

termStates - a map of terms to TermStates for use in building the similarity. May be null if scores are not required

Throws:

IOException - on error

Method Detail

extractTermStates

public abstract void extractTermStates(Map<Term,TermStates> contexts)

Collect all TermStates used by this Weight

Parameters:

contexts - a map to add the TermStates to

getSpans

public abstract Spans getSpans(LeafReaderContext ctx,
                               SpanWeight.Postings requiredPostings)
                        throws IOException

Expert: Return a Spans object iterating over matches from this Weight

Parameters:

ctx - a LeafReaderContext for this Spans

Returns:

a Spans

Throws:

IOException - on error

scorer

public SpanScorer scorer(LeafReaderContext context)
                  throws IOException

Specified by:

scorer in class Weight

Throws:

IOException

getSimScorer

public LeafSimScorer getSimScorer(LeafReaderContext context)
                           throws IOException

Return a LeafSimScorer for this context

Parameters:

context - the LeafReaderContext

Returns:

a SimWeight

Throws:

IOException - on error

explain

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

Specified by:

explain in class Weight

Throws:

IOException

matches

public Matches matches(LeafReaderContext context,
                       int doc)
                throws IOException

Overrides:

matches in class Weight

Throws:

IOException