Class DefFunction

ValueSource implementation which only returns the values from the provided ValueSources which are available for a particular docId. Consequently, when combined with a ConstValueSource, this function serves as a way to return a default value when the values for a field are unavailable.

Inheritance

object

ValueSource

MultiFunction

DefFunction

Inherited Members

MultiFunction.m_sources

MultiFunction.GetDescription()

MultiFunction.GetDescription(string, IList<ValueSource>)

MultiFunction.ValsArr(IList<ValueSource>, IDictionary, AtomicReaderContext)

MultiFunction.ToString(string, FunctionValues[], int)

MultiFunction.CreateWeight(IDictionary, IndexSearcher)

MultiFunction.GetHashCode()

MultiFunction.Equals(object)

ValueSource.ToString()

ValueSource.NewContext(IndexSearcher)

ValueSource.GetSortField(bool)

object.Equals(object, object)

object.GetType()

object.MemberwiseClone()

object.ReferenceEquals(object, object)

Namespace: Lucene.Net.Queries.Function.ValueSources

Assembly: Lucene.Net.Queries.dll

Syntax

public class DefFunction : MultiFunction

Constructors

DefFunction(IList<ValueSource>)

ValueSource implementation which only returns the values from the provided ValueSources which are available for a particular docId. Consequently, when combined with a ConstValueSource, this function serves as a way to return a default value when the values for a field are unavailable.

Declaration

public DefFunction(IList<ValueSource> sources)

Parameters

Type	Name	Description
IList<ValueSource>	sources

Properties

Name

ValueSource implementation which only returns the values from the provided ValueSources which are available for a particular docId. Consequently, when combined with a ConstValueSource, this function serves as a way to return a default value when the values for a field are unavailable.

Declaration

protected override string Name { get; }

Property Value

Type	Description
string

Overrides

MultiFunction.Name

Methods

GetValues(IDictionary, AtomicReaderContext)

Gets the values for this reader and the context that was previously passed to CreateWeight(IDictionary, IndexSearcher)

Declaration

public override FunctionValues GetValues(IDictionary fcontext, AtomicReaderContext readerContext)

Parameters

Type	Name	Description
IDictionary	fcontext
AtomicReaderContext	readerContext

Returns

Type	Description
FunctionValues

Overrides

ValueSource.GetValues(IDictionary, AtomicReaderContext)