org.apache.lucene.search

Class TermQuery.TermWeight

java.lang.Object

org.apache.lucene.search.Weight

org.apache.lucene.search.TermQuery.TermWeight

Enclosing class:

TermQuery

final class TermQuery.TermWeight
extends Weight

Nested Class Summary

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

Weight.DefaultBulkScorer

Field Summary

Fields

Modifier and Type	Field and Description
private boolean	needsScores
private Similarity	similarity
private Similarity.SimWeight	stats
private TermContext	termStates

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

parentQuery

Constructor Summary

Constructors

Constructor and Description
TermWeight(IndexSearcher searcher, boolean needsScores, TermContext termStates)

Method Summary

Modifier and Type	Method and Description
Explanation	explain(LeafReaderContext context, int doc) An explanation of the score computation for the named document.
void	extractTerms(java.util.Set<Term> terms) Expert: adds all terms occurring in this query to the terms set.
private TermsEnum	getTermsEnum(LeafReaderContext context) Returns a TermsEnum positioned at this weights Term or null if the term does not exist in the given context
float	getValueForNormalization() The value for normalization of contained query clauses (e.g.
void	normalize(float queryNorm, float boost) Assigns the query normalization factor and boost to this.
Scorer	scorer(LeafReaderContext context) Returns a Scorer which can iterate in order over all matching documents and assign them a score.
private boolean	termNotInReader(LeafReader reader, Term term)
java.lang.String	toString()

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

bulkScorer, getQuery

Methods inherited from class java.lang.Object

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

Field Detail

similarity

private final Similarity similarity

stats

private final Similarity.SimWeight stats

termStates

private final TermContext termStates

needsScores

private final boolean needsScores

Constructor Detail

TermWeight

public TermWeight(IndexSearcher searcher,
                  boolean needsScores,
                  TermContext termStates)
           throws java.io.IOException

Throws:

java.io.IOException

Method Detail

extractTerms

public void extractTerms(java.util.Set<Term> terms)

Description copied from class: Weight

Expert: adds all terms occurring in this query to the terms set. If the Weight was created with needsScores == true then this method will only extract terms which are used for scoring, otherwise it will extract all terms which are used for matching.

Specified by:

extractTerms in class Weight

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

getValueForNormalization

public float getValueForNormalization()

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

normalize

public void normalize(float queryNorm,
                      float boost)

Description copied from class: Weight

Assigns the query normalization factor and boost to this.

Specified by:

normalize in class Weight

scorer

public Scorer scorer(LeafReaderContext context)
              throws java.io.IOException

Description copied from class: Weight

Returns a Scorer which can iterate in order over all matching documents and assign them a score.

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

NOTE: The returned Scorer does not have LeafReader.getLiveDocs() applied, they need to be checked on top.

Specified by:

scorer in class Weight

Parameters:

context - the LeafReaderContext for which to return the Scorer.

Returns:

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

Throws:

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

getTermsEnum

private TermsEnum getTermsEnum(LeafReaderContext context)
                        throws java.io.IOException

Returns a TermsEnum positioned at this weights Term or null if the term does not exist in the given context

Throws:

java.io.IOException

termNotInReader

private boolean termNotInReader(LeafReader reader,
                                Term term)
                         throws java.io.IOException

Throws:

java.io.IOException

explain

public Explanation explain(LeafReaderContext context,
                           int doc)
                    throws java.io.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:

java.io.IOException - if an IOException occurs