Package org.apache.lucene.queries.function.valuesource

Class SimpleBoolFunction

java.lang.Object

org.apache.lucene.queries.function.ValueSource

org.apache.lucene.queries.function.valuesource.BoolFunction

org.apache.lucene.queries.function.valuesource.SimpleBoolFunction

public abstract class SimpleBoolFunction
extends BoolFunction

BoolFunction implementation which applies an extendible boolean function to the values of a single wrapped ValueSource. Functions this can be used for include whether a field has a value or not, or inverting the boolean value of the wrapped ValueSource.

Field Summary

Fields

Modifier and Type	Field	Description
protected final ValueSource	source

Constructor Summary

Constructors

Constructor	Description
SimpleBoolFunction(ValueSource source)

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)
protected abstract boolean	func(int doc, FunctionValues vals)
BoolDocValues	getValues(Map context, LeafReaderContext readerContext)	Gets the values for this reader and the context that was previously passed to createWeight().
int	hashCode()
protected abstract String	name()

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

source

protected final ValueSource source

Constructor Details

SimpleBoolFunction

public SimpleBoolFunction(ValueSource source)

Method Details

name

protected abstract String name()

func

protected abstract boolean func(int doc,
 FunctionValues vals)
                         throws IOException

Throws:

IOException

getValues

public BoolDocValues 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