org.apache.lucene.queries.function.valuesource

Class LinearFloatFunction

java.lang.Object

org.apache.lucene.queries.function.ValueSource

org.apache.lucene.queries.function.valuesource.LinearFloatFunction

public class LinearFloatFunction
extends ValueSource

LinearFloatFunction implements a linear function over another ValueSource.
Normally Used as an argument to a FunctionQuery

Field Summary

Fields

Modifier and Type	Field and Description
protected float	intercept
protected float	slope
protected ValueSource	source

Constructor Summary

Constructors

Constructor and Description
LinearFloatFunction(ValueSource source, float slope, float intercept)

Method Summary

Modifier and Type	Method and Description
void	createWeight(java.util.Map context, IndexSearcher searcher) Implementations should propagate createWeight to sub-ValueSources which can optionally store weight info in the context.
java.lang.String	description() description of field, used in explain()
boolean	equals(java.lang.Object o)
FunctionValues	getValues(java.util.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 Detail

source

protected final ValueSource source

slope

protected final float slope

intercept

protected final float intercept

Constructor Detail

LinearFloatFunction

public LinearFloatFunction(ValueSource source,
                           float slope,
                           float intercept)

Method Detail

description

public java.lang.String description()

Description copied from class: ValueSource

description of field, used in explain()

Specified by:

description in class ValueSource

getValues

public FunctionValues getValues(java.util.Map context,
                                LeafReaderContext readerContext)
                         throws java.io.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:

java.io.IOException

createWeight

public void createWeight(java.util.Map context,
                         IndexSearcher searcher)
                  throws java.io.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:

java.io.IOException

hashCode

public int hashCode()

Specified by:

hashCode in class ValueSource

equals

public boolean equals(java.lang.Object o)

Specified by:

equals in class ValueSource