Class DefFunction

  extended by org.apache.lucene.queries.function.ValueSource
      extended by org.apache.lucene.queries.function.valuesource.MultiFunction
          extended by 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
Field Summary
Fields inherited from class org.apache.lucene.queries.function.valuesource.MultiFunction
Constructor Summary
DefFunction(List<ValueSource> sources)
Method Summary
 FunctionValues getValues(Map fcontext, AtomicReaderContext readerContext)
          Gets the values for this reader and the context that was previously passed to createWeight()
protected  String name()
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
clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail


public DefFunction(List<ValueSource> sources)
Method Detail


protected String name()
Specified by:
name in class MultiFunction


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

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