Class ScaleSingleFunction

Scales values to be between min and max.

This implementation currently traverses all of the source values to obtain their min and max.

This implementation currently cannot distinguish when documents have been deleted or documents that have no value, and 0.0 values will be used for these cases. This means that if values are normally all greater than 0.0, one can still end up with 0.0 as the min value to map from. In these cases, an appropriate map() function could be used as a workaround to change 0.0 to a value in the real range.

NOTE: This was ScaleFloatFunction in Lucene

Inheritance
System.Object
ValueSource
ScaleSingleFunction
Inherited Members
Namespace: Lucene.Net.Queries.Function.ValueSources
Assembly: Lucene.Net.Queries.dll
Syntax
public class ScaleSingleFunction : ValueSource

Constructors

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ScaleSingleFunction(ValueSource, Single, Single)

Declaration
public ScaleSingleFunction(ValueSource source, float min, float max)
Parameters
Type Name Description
ValueSource source
System.Single min
System.Single max

Fields

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m_max

Declaration
protected readonly float m_max
Field Value
Type Description
System.Single
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m_min

Declaration
protected readonly float m_min
Field Value
Type Description
System.Single
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m_source

Declaration
protected readonly ValueSource m_source
Field Value
Type Description
ValueSource

Methods

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CreateWeight(IDictionary, IndexSearcher)

Declaration
public override void CreateWeight(IDictionary context, IndexSearcher searcher)
Parameters
Type Name Description
IDictionary context
IndexSearcher searcher
Overrides
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Equals(Object)

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

Declaration
public override string GetDescription()
Returns
Type Description
System.String
Overrides
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GetHashCode()

Declaration
public override int GetHashCode()
Returns
Type Description
System.Int32
Overrides
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GetValues(IDictionary, AtomicReaderContext)

Declaration
public override FunctionValues GetValues(IDictionary context, AtomicReaderContext readerContext)
Parameters
Type Name Description
IDictionary context
AtomicReaderContext readerContext
Returns
Type Description
FunctionValues
Overrides