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

Class MultiFloatFunction

java.lang.Object

org.apache.lucene.queries.function.ValueSource

org.apache.lucene.queries.function.valuesource.MultiFloatFunction

Direct Known Subclasses:

MaxFloatFunction, MinFloatFunction, ProductFloatFunction, SumFloatFunction

public abstract class MultiFloatFunction
extends ValueSource

Abstract ValueSource implementation which wraps multiple ValueSources and applies an extendible float function to their values.

Field Summary

Fields

Modifier and Type	Field	Description
protected final ValueSource[]	sources

Constructor Summary

Constructors

Constructor	Description
MultiFloatFunction(ValueSource[] sources)

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 boolean	exists(int doc, FunctionValues[] valsArr)	Called by FunctionValues.exists(int) for each document.
protected abstract float	func(int doc, FunctionValues[] valsArr)
FunctionValues	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

sources

protected final ValueSource[] sources

Constructor Details

MultiFloatFunction

public MultiFloatFunction(ValueSource[] sources)

Method Details

name

protected abstract String name()

func

protected abstract float func(int doc,
 FunctionValues[] valsArr)
                       throws IOException

Throws:

IOException

exists

protected boolean exists(int doc,
 FunctionValues[] valsArr)
                  throws IOException

Called by FunctionValues.exists(int) for each document. Default impl returns true if all of the specified values FunctionValues.exists(int) for the specified doc, else false.

Throws:

IOException

See Also:

• FunctionValues.exists(int)
• MultiFunction.allExists(int, org.apache.lucene.queries.function.FunctionValues[])

description

public String description()

Description copied from class: ValueSource

description of field, used in explain()

Specified by:

description in class ValueSource

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

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

hashCode

public int hashCode()

Specified by:

hashCode in class ValueSource

equals

public boolean equals(Object o)

Specified by:

equals in class ValueSource