Package 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.

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.lucene.queries.function.valuesource.MultiFunction

MultiFunction.Values

Constructor Summary

Constructors

Constructor	Description
DefFunction(List<ValueSource> sources)

Method Summary

Modifier and Type	Method	Description
FunctionValues	getValues(Map fcontext, AtomicReaderContext readerContext)	Gets the values for this reader and the context that was previously passed to createWeight()

Methods inherited from class org.apache.lucene.queries.function.valuesource.MultiFunction

createWeight, description, description, equals, hashCode, toString, valsArr

Methods inherited from class org.apache.lucene.queries.function.ValueSource

getSortField, newContext, toString

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Constructor Details

DefFunction

public DefFunction(List<ValueSource> sources)

Method Details

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