Package org.apache.lucene.queries

Class BoostingQuery

java.lang.Object

org.apache.lucene.search.Query

org.apache.lucene.queries.BoostingQuery

@Deprecated
public class BoostingQuery
extends Query

Deprecated.

Use FunctionScoreQuery.boostByQuery(Query, Query, float)

The BoostingQuery class can be used to effectively demote results that match a given query. Unlike the "NOT" clause, this still selects documents that contain undesirable terms, but reduces their overall score: Query balancedQuery = new BoostingQuery(positiveQuery, negativeQuery, 0.01f); In this scenario the positiveQuery contains the mandatory, desirable criteria which is used to select all matching documents, and the negativeQuery contains the undesirable elements which are simply used to lessen the scores. Documents that match the negativeQuery have their score multiplied by the supplied "boost" parameter, so this should be less than 1 to achieve a demoting effect This code was originally made available here: http://marc.theaimsgroup.com/?l=lucene-user&m=108058407130459&w=2 and is documented here: http://wiki.apache.org/lucene-java/CommunityContributions

Constructor Summary

Constructors

Constructor	Description
BoostingQuery(Query match, Query context, float boost)	Deprecated.

Method Summary

Modifier and Type	Method	Description
Weight	createWeight(IndexSearcher searcher, boolean needsScores, float boost)	Deprecated.
boolean	equals(Object other)	Deprecated.
float	getBoost()	Deprecated.
Query	getContext()	Deprecated.
Query	getMatch()	Deprecated.
int	hashCode()	Deprecated.
Query	rewrite(IndexReader reader)	Deprecated.
String	toString(String field)	Deprecated.

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

classHash, sameClassAs, toString

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

BoostingQuery

public BoostingQuery(Query match,
                     Query context,
                     float boost)

Deprecated.

Method Detail

rewrite

public Query rewrite(IndexReader reader)
              throws IOException

Deprecated.

Overrides:

rewrite in class Query

Throws:

IOException

createWeight

public Weight createWeight(IndexSearcher searcher,
                           boolean needsScores,
                           float boost)
                    throws IOException

Deprecated.

Overrides:

createWeight in class Query

Throws:

IOException

getMatch

public Query getMatch()

Deprecated.

getContext

public Query getContext()

Deprecated.

getBoost

public float getBoost()

Deprecated.

hashCode

public int hashCode()

Deprecated.

Specified by:

hashCode in class Query

equals

public boolean equals(Object other)

Deprecated.

Specified by:

equals in class Query

toString

public String toString(String field)

Deprecated.

Specified by:

toString in class Query