org.apache.lucene.queries.function.valuesource
Class DefFunction
java.lang.Object
org.apache.lucene.queries.function.ValueSource
org.apache.lucene.queries.function.valuesource.MultiFunction
org.apache.lucene.queries.function.valuesource.DefFunction
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 a ConstValueSource
, this function serves as a way to return a default
value when the values for a field are unavailable.
DefFunction
public DefFunction(List<ValueSource> sources)
name
protected String name()
- Specified by:
name
in class MultiFunction
getValues
public FunctionValues getValues(Map fcontext,
AtomicReaderContext readerContext)
throws IOException
- Description copied from class:
ValueSource
- Gets the values for this reader and the context that was previously
passed to createWeight()
- Specified by:
getValues
in class ValueSource
- Throws:
IOException
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