org.apache.lucene.queries.function.valuesource
Class IfFunction

java.lang.Object
  org.apache.lucene.queries.function.ValueSource
      org.apache.lucene.queries.function.valuesource.BoolFunction
          org.apache.lucene.queries.function.valuesource.IfFunction

public class IfFunction
extends BoolFunction

Depending on the boolean value of the ifSource function, returns the value of the trueSource or falseSource function.

Constructor Summary

IfFunction(ValueSource ifSource, ValueSource trueSource, ValueSource falseSource)

Method Summary

void	createWeight(Map context, IndexSearcher searcher) Implementations should propagate createWeight to sub-ValueSources which can optionally store weight info in the context.
String	description() description of field, used in explain()
boolean	equals(Object o)
FunctionValues	getValues(Map context, AtomicReaderContext readerContext) Gets the values for this reader and the context that was previously passed to createWeight()
int	hashCode()

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

IfFunction

public IfFunction(ValueSource ifSource,
                  ValueSource trueSource,
                  ValueSource falseSource)

Method Detail

getValues

public FunctionValues getValues(Map context,
                                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

description

public String description()

Description copied from class: ValueSource

description of field, used in explain()

Specified by:

description in class ValueSource

hashCode

public int hashCode()

Specified by:

hashCode in class ValueSource

equals

public boolean equals(Object o)

Specified by:

equals in class ValueSource

createWeight

public void createWeight(Map context,
                         IndexSearcher searcher)
                  throws IOException

Description copied from class: ValueSource

Implementations should propagate createWeight to sub-ValueSources which can optionally store weight info in the context. The context object will be passed to getValues() where this info can be retrieved.

Overrides:

createWeight in class ValueSource

Throws:

IOException