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

Class DoubleDistance

java.lang.Object

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

de.lmu.ifi.dbs.elki.distance.distancevalue.NumberDistance<DoubleDistance,Double>

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

All Implemented Interfaces:

Distance<DoubleDistance>, Externalizable, Serializable, Comparable<DoubleDistance>

public class DoubleDistance
extends NumberDistance<DoubleDistance,Double>

Provides a Distance for a double-valued distance.

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
static DoubleDistance	FACTORY The static factory instance
static DoubleDistance	INFINITE_DISTANCE Infinite distance constant
private static long	serialVersionUID Generated serialVersionUID.
static DoubleDistance	UNDEFINED_DISTANCE Undefined distance constant
(package private) double	value The actual value.
static DoubleDistance	ZERO_DISTANCE Zero distance constant

Fields inherited from class de.lmu.ifi.dbs.elki.distance.distancevalue.AbstractDistance

DOUBLE_PATTERN, INFINITY_PATTERN, INTEGER_PATTERN

Constructor Summary

Constructors

Constructor and Description
DoubleDistance() Empty constructor for serialization purposes.
DoubleDistance(double value) Constructs a new DoubleDistance object that represents the double argument.

Method Summary

Methods

Modifier and Type	Method and Description
int	compareTo(DoubleDistance other)
double	doubleValue() Get the value as double.
boolean	equals(Object obj) 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.
int	externalizableSize() Returns the number of Bytes this distance uses if it is written to an external file.
DoubleDistance	fromDouble(double val) Build a new instance from a double value.
Pattern	getPattern() Get the pattern accepted by this distance
int	hashCode() Any extending class should implement a proper hashCode method.
DoubleDistance	infiniteDistance() An infinite DoubleDistance is based on Double.POSITIVE_INFINITY.
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.
long	longValue() Get the value as long.
DoubleDistance	nullDistance() A null DoubleDistance is based on 0.
DoubleDistance	parseString(String val) As pattern is required a String defining a Double.
void	readExternal(ObjectInput in) Reads the double value of this DoubleDistance from the specified stream.
String	toString() Any implementing class should implement a proper toString-method for printing the result-values.
DoubleDistance	undefinedDistance() An undefined DoubleDistance is based on Double.NaN.
void	writeExternal(ObjectOutput out) Writes the double value of this DoubleDistance to the specified stream.

Methods inherited from class de.lmu.ifi.dbs.elki.distance.distancevalue.NumberDistance

byteValue, floatValue, intValue, shortValue

Methods inherited from class de.lmu.ifi.dbs.elki.distance.distancevalue.AbstractDistance

requiredInputPattern, testInputPattern

Methods inherited from class java.lang.Object

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

Field Detail

ZERO_DISTANCE

public static final DoubleDistance ZERO_DISTANCE

Zero distance constant

INFINITE_DISTANCE

public static final DoubleDistance INFINITE_DISTANCE

Infinite distance constant

UNDEFINED_DISTANCE

public static final DoubleDistance UNDEFINED_DISTANCE

Undefined distance constant

FACTORY

public static final DoubleDistance FACTORY

The static factory instance

value

double value

The actual value.

serialVersionUID

private static final long serialVersionUID

Generated serialVersionUID.

See Also:

Constant Field Values

Constructor Detail

DoubleDistance

public DoubleDistance()

Empty constructor for serialization purposes.

DoubleDistance

public DoubleDistance(double value)

Constructs a new DoubleDistance object that represents the double argument.

Parameters:

value - the value to be represented by the DoubleDistance.

Method Detail

fromDouble

public DoubleDistance fromDouble(double val)

Description copied from class: NumberDistance

Build a new instance from a double value.

Specified by:

fromDouble in class NumberDistance<DoubleDistance,Double>

Parameters:

val - Value

Returns:

Distance

writeExternal

public void writeExternal(ObjectOutput out)
                   throws IOException

Writes the double value of this DoubleDistance to the specified stream.

Throws:

IOException

readExternal

public void readExternal(ObjectInput in)
                  throws IOException

Reads the double value of this DoubleDistance from the specified stream.

Throws:

IOException

externalizableSize

public int externalizableSize()

Returns the number of Bytes this distance uses if it is written to an external file.

Returns:

8 (8 Byte for a double value)

doubleValue

public double doubleValue()

Description copied from class: NumberDistance

Get the value as double.

Specified by:

doubleValue in class NumberDistance<DoubleDistance,Double>

Returns:

same result as getValue().doubleValue() but may be more efficient.

longValue

public long longValue()

Description copied from class: NumberDistance

Get the value as long.

Specified by:

longValue in class NumberDistance<DoubleDistance,Double>

Returns:

same result as getValue().longValue() but may be more efficient.

compareTo

public int compareTo(DoubleDistance other)

infiniteDistance

public DoubleDistance infiniteDistance()

An infinite DoubleDistance is based on Double.POSITIVE_INFINITY.

Returns:

an infinite distance

nullDistance

public DoubleDistance nullDistance()

A null DoubleDistance is based on 0.

Returns:

a null distance

undefinedDistance

public DoubleDistance undefinedDistance()

An undefined DoubleDistance is based on Double.NaN.

Returns:

an undefined distance

parseString

public DoubleDistance parseString(String val)
                           throws IllegalArgumentException

As pattern is required a String defining a Double.

Parameters:

val - a pattern defining a similarity suitable to this measurement function

Returns:

a measurement suitable to this measurement function based on the given pattern

Throws:

IllegalArgumentException - if the given pattern is not compatible with the requirements of this measurement function

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<DoubleDistance>

Overrides:

isInfiniteDistance in class AbstractDistance<DoubleDistance>

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<DoubleDistance>

Overrides:

isNullDistance in class AbstractDistance<DoubleDistance>

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<DoubleDistance>

Overrides:

isUndefinedDistance in class AbstractDistance<DoubleDistance>

Returns:

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

getPattern

public Pattern getPattern()

Description copied from class: AbstractDistance

Get the pattern accepted by this distance

Specified by:

getPattern in class AbstractDistance<DoubleDistance>

Returns:

Pattern

toString

public String toString()

Description copied from interface: Distance

Any implementing class should implement a proper toString-method for printing the result-values.

Specified by:

toString in interface Distance<DoubleDistance>

Overrides:

toString in class Object

Returns:

String a human-readable representation of the Distance

hashCode

public int hashCode()

Description copied from class: AbstractDistance

Any extending class should implement a proper hashCode method.

Specified by:

hashCode in class AbstractDistance<DoubleDistance>

equals

public boolean equals(Object obj)

Description copied from class: AbstractDistance

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 AbstractDistance<DoubleDistance>