org.apache.lucene.search.suggest.document

Class CompletionWeight

java.lang.Object

org.apache.lucene.search.Weight

org.apache.lucene.search.suggest.document.CompletionWeight

public class CompletionWeight
extends Weight

Expert: the Weight for CompletionQuery, used to score and explain these queries. Subclasses can override setNextMatch(IntsRef), boost() and context() to calculate the boost and extract the context of a matched path prefix.

WARNING: This API is experimental and might change in incompatible ways in the next release.

Nested Class Summary

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

Weight.DefaultBulkScorer

Field Summary

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

parentQuery

Constructor Summary

Constructors

Constructor and Description
CompletionWeight(CompletionQuery query, Automaton automaton) Creates a weight for query with an automaton, using the reader for index stats

Method Summary

Modifier and Type	Method and Description
protected float	boost() Returns the boost of the partial path set by setNextMatch(IntsRef)
BulkScorer	bulkScorer(LeafReaderContext context)
protected CharSequence	context() Returns the context of the partial path set by setNextMatch(IntsRef)
Explanation	explain(LeafReaderContext context, int doc)
void	extractTerms(Set<Term> terms)
Automaton	getAutomaton() Returns the automaton specified by the CompletionQuery
float	getValueForNormalization()
void	normalize(float norm, float boost)
Scorer	scorer(LeafReaderContext context)
protected void	setNextMatch(IntsRef pathPrefix) Set for every partial path in the index that matched the query automaton.

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

getQuery

Methods inherited from class java.lang.Object

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

Constructor Detail

CompletionWeight

public CompletionWeight(CompletionQuery query,
                        Automaton automaton)
                 throws IOException

Creates a weight for query with an automaton, using the reader for index stats

Throws:

IOException

Method Detail

getAutomaton

public Automaton getAutomaton()

Returns the automaton specified by the CompletionQuery

Returns:

query automaton

bulkScorer

public BulkScorer bulkScorer(LeafReaderContext context)
                      throws IOException

Overrides:

bulkScorer in class Weight

Throws:

IOException

setNextMatch

protected void setNextMatch(IntsRef pathPrefix)

Set for every partial path in the index that matched the query automaton. Subclasses should override boost() and context() to return an appropriate value with respect to the current pathPrefix.

Parameters:

pathPrefix - the prefix of a matched path

boost

protected float boost()

Returns the boost of the partial path set by setNextMatch(IntsRef)

Returns:

suggestion query-time boost

context

protected CharSequence context()

Returns the context of the partial path set by setNextMatch(IntsRef)

Returns:

suggestion context

scorer

public Scorer scorer(LeafReaderContext context)
              throws IOException

Specified by:

scorer in class Weight

Throws:

IOException

extractTerms

public void extractTerms(Set<Term> terms)

Specified by:

extractTerms in class Weight

explain

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

Specified by:

explain in class Weight

Throws:

IOException

getValueForNormalization

public float getValueForNormalization()
                               throws IOException

Specified by:

getValueForNormalization in class Weight

Throws:

IOException

normalize

public void normalize(float norm,
                      float boost)

Specified by:

normalize in class Weight