Class CustomScoreQuery

Query that sets document score as a programmatic function of several (sub) scores:

the score of its subQuery (any query)
(optional) the score of its FunctionQuery (or queries).

Subclasses can modify the computation by overriding GetCustomScoreProvider(AtomicReaderContext).

This is a Lucene.NET EXPERIMENTAL API, use at your own risk

Inheritance

System.Object

Query

CustomScoreQuery

Inherited Members

Query.Boost

Query.ToString()

Lucene.Net.Search.Query.ExtractTerms(ISet<>)

Namespace: Lucene.Net.Queries

Assembly: Lucene.Net.Queries.dll

Syntax

public class CustomScoreQuery : Query

Constructors

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CustomScoreQuery(Query)

Create a CustomScoreQuery over input subQuery.

Declaration

public CustomScoreQuery(Query subQuery)

Parameters

Type	Name	Description
Query	subQuery	the sub query whose scored is being customized. Must not be `null`.

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CustomScoreQuery(Query, FunctionQuery)

Create a CustomScoreQuery over input subQuery and a FunctionQuery.

Declaration

public CustomScoreQuery(Query subQuery, FunctionQuery scoringQuery)

Parameters

Type	Name	Description
Query	subQuery	the sub query whose score is being customized. Must not be `null`.
FunctionQuery	scoringQuery	a value source query whose scores are used in the custom score computation. This parameter is optional - it can be null.

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CustomScoreQuery(Query, FunctionQuery[])

Create a CustomScoreQuery over input subQuery and a FunctionQuery.

Declaration

public CustomScoreQuery(Query subQuery, params FunctionQuery[] scoringQueries)

Parameters

Type	Name	Description
Query	subQuery	the sub query whose score is being customized. Must not be `null`.
FunctionQuery[]	scoringQueries	value source queries whose scores are used in the custom score computation. This parameter is optional - it can be null or even an empty array.

Properties

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IsStrict

Checks if this is strict custom scoring. In strict custom scoring, the ValueSource part does not participate in weight normalization. This may be useful when one wants full control over how scores are modified, and does not care about normalizing by the ValueSource part. One particular case where this is useful if for testing this query.

Note: only has effect when the ValueSource part is not null.

Declaration

public virtual bool IsStrict { get; set; }

Property Value

Type	Description
System.Boolean

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Name

A short name of this query, used in ToString(String).

Declaration

public virtual string Name { get; }

Property Value

Type	Description
System.String

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ScoringQueries

The scoring queries that only affect the score of CustomScoreQuery.

Declaration

public virtual Query[] ScoringQueries { get; }

Property Value

Type	Description
Query[]

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SubQuery

The sub-query that CustomScoreQuery wraps, affecting both the score and which documents match.

Declaration

public virtual Query SubQuery { get; }

Property Value

Type	Description
Query

Methods

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Clone()

Declaration

public override object Clone()

Returns

Type	Description
System.Object

Overrides

Query.Clone()

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CreateWeight(IndexSearcher)

Declaration

public override Weight CreateWeight(IndexSearcher searcher)

Parameters

Type	Name	Description
IndexSearcher	searcher

Returns

Type	Description
Weight

Overrides

Query.CreateWeight(IndexSearcher)

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Equals(Object)

Returns true if o is equal to this.

Declaration

public override bool Equals(object o)

Parameters

Type	Name	Description
System.Object	o

Returns

Type	Description
System.Boolean

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ExtractTerms(ISet<Term>)

Declaration

public override void ExtractTerms(ISet<Term> terms)

Parameters

Type	Name	Description
ISet<Term>	terms

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GetCustomScoreProvider(AtomicReaderContext)

Returns a CustomScoreProvider that calculates the custom scores for the given IndexReader. The default implementation returns a default implementation as specified in the docs of CustomScoreProvider. @since 2.9.2

Declaration

protected virtual CustomScoreProvider GetCustomScoreProvider(AtomicReaderContext context)

Parameters

Type	Name	Description
AtomicReaderContext	context

Returns

Type	Description
CustomScoreProvider

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GetHashCode()

Returns a hash code value for this object.

Declaration

public override int GetHashCode()

Returns

Type	Description
System.Int32

Overrides

Query.GetHashCode()

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Rewrite(IndexReader)

Declaration

public override Query Rewrite(IndexReader reader)

Parameters

Type	Name	Description
IndexReader	reader

Returns

Type	Description
Query

Overrides

Query.Rewrite(IndexReader)

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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