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
ValueSourceimplementation 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 FunctionValuesgetValues(Map<Object,Object> fcontext, LeafReaderContext readerContext)Gets the values for this reader and the context that was previously passed to createWeight().protected Stringname()-
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:
namein classMultiFunction
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getValues
public FunctionValues getValues(Map<Object,Object> fcontext, LeafReaderContext readerContext) throws IOException
Description copied from class:ValueSourceGets 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:
getValuesin classValueSource- Throws:
IOException
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