Class DefFunction
- java.lang.Object
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- org.apache.lucene.queries.function.ValueSource
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- org.apache.lucene.queries.function.valuesource.MultiFunction
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- org.apache.lucene.queries.function.valuesource.DefFunction
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public class DefFunction extends MultiFunction
ValueSource
implementation which only returns the values from the provided ValueSources which are available for a particular docId. Consequently, when combined with aConstValueSource
, this function serves as a way to return a default value when the values for a field are unavailable.
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Nested Class Summary
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Nested classes/interfaces inherited from class org.apache.lucene.queries.function.valuesource.MultiFunction
MultiFunction.Values
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Field Summary
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Fields inherited from class org.apache.lucene.queries.function.valuesource.MultiFunction
sources
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Constructor Summary
Constructors Constructor Description DefFunction(List<ValueSource> sources)
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description FunctionValues
getValues(Map fcontext, LeafReaderContext readerContext)
Gets the values for this reader and the context that was previously passed to createWeight().protected String
name()
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Methods inherited from class org.apache.lucene.queries.function.valuesource.MultiFunction
allExists, allExists, anyExists, anyExists, createWeight, description, description, equals, hashCode, toString, valsArr
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Methods inherited from class org.apache.lucene.queries.function.ValueSource
asDoubleValuesSource, asLongValuesSource, fromDoubleValuesSource, getSortField, newContext, toString
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Constructor Detail
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DefFunction
public DefFunction(List<ValueSource> sources)
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Method Detail
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name
protected String name()
- Specified by:
name
in classMultiFunction
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getValues
public FunctionValues getValues(Map fcontext, LeafReaderContext readerContext) throws IOException
Description copied from class:ValueSource
Gets the values for this reader and the context that was previously passed to createWeight(). The values must be consumed in a forward docID manner, and you must call this method again to iterate through the values again.- Specified by:
getValues
in classValueSource
- Throws:
IOException
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