Package org.moeaframework.util.clustering

Class CachedDistanceMeasure<T>

java.lang.Object

org.moeaframework.util.clustering.CachedDistanceMeasure<T>

Type Parameters:

T - the type of object being stored

All Implemented Interfaces:

DistanceMeasure<T>

public class CachedDistanceMeasure<T>
extends Object
implements DistanceMeasure<T>

Wraps a DistanceMeasure to cache or memoize the calculations in memory. This is similar to using a precomputed distance matrix, except the distance calculations are performed lazily.

Nested Class Summary

Nested classes/interfaces inherited from interface org.moeaframework.util.clustering.DistanceMeasure

DistanceMeasure.ApacheDistanceMeasure<T extends org.apache.commons.math3.ml.clustering.Clusterable>

Constructor Summary

Constructors

Constructor	Description
CachedDistanceMeasure(DistanceMeasure<T> distanceMeasure, boolean isSymmetric)	Wraps the provided distance measure with a cached version.

Method Summary

Modifier and Type	Method	Description
double	compute(T first, T second)	Returns the distance between the two objects.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

CachedDistanceMeasure

public CachedDistanceMeasure(DistanceMeasure<T> distanceMeasure,
 boolean isSymmetric)

Wraps the provided distance measure with a cached version.

Parameters:

distanceMeasure - the uncached distance measure

isSymmetric - true if the distance measure is symmetric; see CachedDistanceMeasure for the definition of symmetry.

Method Details

compute

public double compute(T first,
 T second)

Description copied from interface: DistanceMeasure

Returns the distance between the two objects.

Specified by:

compute in interface DistanceMeasure<T>

Parameters:

first - the first object

second - the second object

Returns:

the distance