Class BoostingQuery

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This code was originally made available here: [WWW] http://marc.theaimsgroup.com/?l=lucene-user&m=108058407130459&w=2 and is documented here: http://wiki.apache.org/lucene-java/CommunityContributions

Inheritance
System.Object
Query
BoostingQuery
Inherited Members
System.Object.Equals(System.Object, System.Object)
System.Object.GetType()
System.Object.MemberwiseClone()
System.Object.ReferenceEquals(System.Object, System.Object)
Namespace: Lucene.Net.Queries
Assembly: Lucene.Net.Queries.dll
Syntax
public class BoostingQuery : Query

Constructors

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BoostingQuery(Query, Query, Single)

Declaration
public BoostingQuery(Query match, Query context, float boost)
Parameters
Type Name Description
Query match
Query context
System.Single boost

Methods

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Equals(Object)

Declaration
public override bool Equals(object obj)
Parameters
Type Name Description
System.Object obj
Returns
Type Description
System.Boolean
Overrides
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GetHashCode()

Declaration
public override int GetHashCode()
Returns
Type Description
System.Int32
Overrides
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Rewrite(IndexReader)

Declaration
public override Query Rewrite(IndexReader reader)
Parameters
Type Name Description
IndexReader reader
Returns
Type Description
Query
Overrides
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ToString(String)

Declaration
public override string ToString(string field)
Parameters
Type Name Description
System.String field
Returns
Type Description
System.String
Overrides