org.apache.solr.search.function.distance
Class SquaredEuclideanFunction

java.lang.Object
  org.apache.lucene.queries.function.ValueSource
      org.apache.solr.search.function.distance.VectorDistanceFunction
          org.apache.solr.search.function.distance.SquaredEuclideanFunction

public class SquaredEuclideanFunction
extends VectorDistanceFunction

While not strictly a distance, the Sq. Euclidean Distance is often all that is needed in many applications that require a distance, thus saving a sq. rt. calculation

Field Summary

protected String

name

Fields inherited from class org.apache.solr.search.function.distance.VectorDistanceFunction

oneOverPower, power, source1, source2

Constructor Summary

SquaredEuclideanFunction(MultiValueSource source1, MultiValueSource source2)

Method Summary

protected double	distance(int doc, FunctionValues dv1, FunctionValues dv2) Calculate the distance
boolean	equals(Object o)
int	hashCode()
protected String	name()

Methods inherited from class org.apache.solr.search.function.distance.VectorDistanceFunction

createWeight, description, getValues

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

Field Detail

name

protected String name

Constructor Detail

SquaredEuclideanFunction

public SquaredEuclideanFunction(MultiValueSource source1,
                                MultiValueSource source2)

Method Detail

name

protected String name()

Overrides:

name in class VectorDistanceFunction

distance

protected double distance(int doc,
                          FunctionValues dv1,
                          FunctionValues dv2)

Description copied from class: VectorDistanceFunction

Calculate the distance

Overrides:

distance in class VectorDistanceFunction

Parameters:

doc - The doc to score

dv1 - The values from the first MultiValueSource

dv2 - The values from the second MultiValueSource

Returns:

The distance

equals

public boolean equals(Object o)

Overrides:

equals in class VectorDistanceFunction

hashCode

public int hashCode()

Overrides:

hashCode in class VectorDistanceFunction