de.lmu.ifi.dbs.elki.distance.distancevalue

Class AbstractDistance<D extends AbstractDistance<D>>

java.lang.Object

de.lmu.ifi.dbs.elki.distance.distancevalue.AbstractDistance<D>

Type Parameters:

D - the (final) type of Distance used

All Implemented Interfaces:

Distance<D>, Externalizable, Serializable, Comparable<D>

Direct Known Subclasses:

CorrelationDistance, NumberDistance, SubspaceDistance

public abstract class AbstractDistance<D extends AbstractDistance<D>>
extends Object
implements Distance<D>

An abstract distance implements equals conveniently for any extending class. At the same time any extending class is to implement hashCode properly. See DistanceUtil for related utility functions such as min, max.

See Also:

DistanceUtil, Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
static Pattern	DOUBLE_PATTERN Pattern for parsing and validating double values
static String	INFINITY_PATTERN Indicates an infinity pattern.
static Pattern	INTEGER_PATTERN Pattern for parsing and validating integer values

Constructor Summary

Constructors

Constructor and Description
AbstractDistance()

Method Summary

Methods

Modifier and Type	Method and Description
boolean	equals(Object o) Returns true if this == o has the value true or o is not null and o is of the same class as this instance and this.compareTo(o) is 0, false otherwise.
abstract Pattern	getPattern() Get the pattern accepted by this distance
abstract int	hashCode() Any extending class should implement a proper hashCode method.
boolean	isInfiniteDistance() Returns true, if the distance is an infinite distance, false otherwise.
boolean	isNullDistance() Returns true, if the distance is a null distance, false otherwise.
boolean	isUndefinedDistance() Returns true, if the distance is an undefined distance, false otherwise.
String	requiredInputPattern() Returns a String as description of the required input format.
boolean	testInputPattern(String value) Test a string value against the input pattern.

Methods inherited from class java.lang.Object

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

Methods inherited from interface de.lmu.ifi.dbs.elki.distance.distancevalue.Distance

externalizableSize, infiniteDistance, minus, nullDistance, parseString, plus, toString, undefinedDistance

Methods inherited from interface java.lang.Comparable

compareTo

Methods inherited from interface java.io.Externalizable

readExternal, writeExternal

Field Detail

INFINITY_PATTERN

public static final String INFINITY_PATTERN

Indicates an infinity pattern.

See Also:

Constant Field Values

DOUBLE_PATTERN

public static final Pattern DOUBLE_PATTERN

Pattern for parsing and validating double values

INTEGER_PATTERN

public static final Pattern INTEGER_PATTERN

Pattern for parsing and validating integer values

Constructor Detail

AbstractDistance

public AbstractDistance()

Method Detail

hashCode

public abstract int hashCode()

Any extending class should implement a proper hashCode method.

Overrides:

hashCode in class Object

equals

public boolean equals(Object o)

Returns true if this == o has the value true or o is not null and o is of the same class as this instance and this.compareTo(o) is 0, false otherwise.

Overrides:

equals in class Object

getPattern

public abstract Pattern getPattern()

Get the pattern accepted by this distance

Returns:

Pattern

requiredInputPattern

public final String requiredInputPattern()

Description copied from interface: Distance

Returns a String as description of the required input format.

Specified by:

requiredInputPattern in interface Distance<D extends AbstractDistance<D>>

Returns:

a String as description of the required input format

testInputPattern

public final boolean testInputPattern(String value)

Test a string value against the input pattern.

Parameters:

value - String value to test

Returns:

Match result

isInfiniteDistance

public boolean isInfiniteDistance()

Description copied from interface: Distance

Returns true, if the distance is an infinite distance, false otherwise.

Specified by:

isInfiniteDistance in interface Distance<D extends AbstractDistance<D>>

Returns:

true, if the distance is an infinite distance, false otherwise

isNullDistance

public boolean isNullDistance()

Description copied from interface: Distance

Returns true, if the distance is a null distance, false otherwise.

Specified by:

isNullDistance in interface Distance<D extends AbstractDistance<D>>

Returns:

true, if the distance is a null distance, false otherwise

isUndefinedDistance

public boolean isUndefinedDistance()

Description copied from interface: Distance

Returns true, if the distance is an undefined distance, false otherwise.

Specified by:

isUndefinedDistance in interface Distance<D extends AbstractDistance<D>>

Returns:

true, if the distance is an undefined distance, false otherwise