Package 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.

Field Summary

Fields

Modifier and Type	Field	Description
private final ValueSource	falseSource
private final ValueSource	ifSource
private final ValueSource	trueSource

Constructor Summary

Constructors

Constructor	Description
IfFunction(ValueSource ifSource, ValueSource trueSource, ValueSource falseSource)

Method Summary

Modifier and Type	Method	Description
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, LeafReaderContext 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

asDoubleValuesSource, asLongValuesSource, fromDoubleValuesSource, getSortField, newContext, toString

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Field Details

ifSource

private final ValueSource ifSource

trueSource

private final ValueSource trueSource

falseSource

private final ValueSource falseSource

Constructor Details

IfFunction

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

Method Details

getValues

public FunctionValues getValues(Map context,
 LeafReaderContext readerContext)
                         throws IOException

Description copied from class: ValueSource

Gets 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:

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