de.lmu.ifi.dbs.elki.distance.distancefunction.set

Class AbstractSetDistanceFunction<O>

java.lang.Object

de.lmu.ifi.dbs.elki.distance.distancefunction.set.AbstractSetDistanceFunction<O>

Type Parameters:

O - Vector type

All Implemented Interfaces:

DistanceFunction<O>, PrimitiveDistanceFunction<O>

Direct Known Subclasses:

HammingDistanceFunction, JaccardSimilarityDistanceFunction

public abstract class AbstractSetDistanceFunction<O>
extends java.lang.Object
implements PrimitiveDistanceFunction<O>

Abstract base class for set distance functions.

Since:

0.7.0

Author:

Erich Schubert

Field Summary

Fields

Modifier and Type	Field and Description
static java.lang.Double	DOUBLE_NULL Constants for checking null.
static java.lang.Integer	INTEGER_NULL Constants for checking null.
static java.lang.String	STRING_NULL Empty string.

Constructor Summary

Constructors

Constructor and Description
AbstractSetDistanceFunction()

Method Summary

Modifier and Type	Method and Description
protected static boolean	isNull(java.lang.Object val) Test a value for null.

Methods inherited from class java.lang.Object

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

Methods inherited from interface de.lmu.ifi.dbs.elki.distance.distancefunction.PrimitiveDistanceFunction

distance, getInputTypeRestriction, instantiate

Methods inherited from interface de.lmu.ifi.dbs.elki.distance.distancefunction.DistanceFunction

isMetric, isSquared, isSymmetric

Field Detail

INTEGER_NULL

public static final java.lang.Integer INTEGER_NULL

Constants for checking null.

DOUBLE_NULL

public static final java.lang.Double DOUBLE_NULL

Constants for checking null.

STRING_NULL

public static final java.lang.String STRING_NULL

Empty string.

See Also:

Constant Field Values

Constructor Detail

AbstractSetDistanceFunction

public AbstractSetDistanceFunction()

Method Detail

isNull

protected static boolean isNull(java.lang.Object val)

Test a value for null. TODO: delegate to FeatureVector instead?

Parameters:

val - Value

Returns:

true when null