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

Class FloatDistance

java.lang.Object

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

de.lmu.ifi.dbs.elki.distance.distancevalue.NumberDistance<FloatDistance,Float>

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

All Implemented Interfaces:

Distance<FloatDistance>, Externalizable, Serializable, Comparable<FloatDistance>

public class FloatDistance
extends NumberDistance<FloatDistance,Float>

Provides a Distance for a float-valued distance.

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
static FloatDistance	FACTORY The static factory instance
private static long	serialVersionUID Generated serialVersionUID.
private float	value The distance value.

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

DOUBLE_PATTERN, INFINITY_PATTERN, INTEGER_PATTERN

Constructor Summary

Constructors

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

Method Summary

Methods

Modifier and Type	Method and Description
int	compareTo(FloatDistance other) Compares this NumberDistance with the given NumberDistance wrt the represented value.
double	doubleValue() Get the value as double.
int	externalizableSize() Returns the number of Bytes this distance uses if it is written to an external file.
float	floatValue() Get the value as float.
FloatDistance	fromDouble(double val) Build a new instance from a double value.
Pattern	getPattern() Get the pattern accepted by this distance
Float	getValue() Returns the value of this NumberDistance.
FloatDistance	infiniteDistance() An infinite FloatDistance is based on Float.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.
FloatDistance	minus(FloatDistance distance) Returns a new Distance by subtracting the given distance from this distance.
FloatDistance	nullDistance() A null FloatDistance is based on 0.
FloatDistance	parseString(String val) As pattern is required a String defining a Float.
FloatDistance	plus(FloatDistance distance) Returns a new distance as sum of this distance and the given distance.
void	readExternal(ObjectInput in) Reads the float value of this FloatDistance from the specified stream.
(package private) void	setValue(Float value) Sets the value of this NumberDistance.
FloatDistance	times(float lambda) Returns a new distance as the product of this distance and the given float value.
FloatDistance	times(FloatDistance distance) Returns a new distance as the product of this distance and the given distance.
FloatDistance	undefinedDistance() An undefined FloatDistance is based on Float.NaN.
void	writeExternal(ObjectOutput out) Writes the float value of this FloatDistance to the specified stream.

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

byteValue, hashCode, intValue, shortValue, toString

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

equals, requiredInputPattern, testInputPattern

Methods inherited from class java.lang.Object

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

Field Detail

FACTORY

public static final FloatDistance FACTORY

The static factory instance

value

private float value

The distance value.

serialVersionUID

private static final long serialVersionUID

Generated serialVersionUID.

See Also:

Constant Field Values

Constructor Detail

FloatDistance

public FloatDistance()

Empty constructor for serialization purposes.

FloatDistance

public FloatDistance(float value)

Constructs a new FloatDistance object that represents the float argument.

Parameters:

value - the value to be represented by the FloatDistance.

Method Detail

fromDouble

public FloatDistance fromDouble(double val)

Description copied from class: NumberDistance

Build a new instance from a double value.

Specified by:

fromDouble in class NumberDistance<FloatDistance,Float>

Parameters:

val - Value

Returns:

Distance

plus

public FloatDistance plus(FloatDistance distance)

Description copied from interface: Distance

Returns a new distance as sum of this distance and the given distance.

Parameters:

distance - the distance to be added to this distance

Returns:

a new distance as sum of this distance and the given distance

minus

public FloatDistance minus(FloatDistance distance)

Description copied from interface: Distance

Returns a new Distance by subtracting the given distance from this distance.

Parameters:

distance - the distance to be subtracted from this distance

Returns:

a new Distance by subtracting the given distance from this distance

times

public FloatDistance times(FloatDistance distance)

Returns a new distance as the product of this distance and the given distance.

Parameters:

distance - the distance to be multiplied with this distance

Returns:

a new distance as the product of this distance and the given distance

times

public FloatDistance times(float lambda)

Returns a new distance as the product of this distance and the given float value.

Parameters:

lambda - the float value this distance should be multiplied with

Returns:

a new distance as the product of this distance and the given double value

writeExternal

public void writeExternal(ObjectOutput out)
                   throws IOException

Writes the float value of this FloatDistance to the specified stream.

Throws:

IOException

readExternal

public void readExternal(ObjectInput in)
                  throws IOException

Reads the float value of this FloatDistance 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:

4 (4 Byte for a float value)

getValue

public Float getValue()

Description copied from class: NumberDistance

Returns the value of this NumberDistance.

Specified by:

getValue in class NumberDistance<FloatDistance,Float>

Returns:

the value of this NumberDistance

setValue

void setValue(Float value)

Description copied from class: NumberDistance

Sets the value of this NumberDistance.

Specified by:

setValue in class NumberDistance<FloatDistance,Float>

Parameters:

value - the value to be set

doubleValue

public double doubleValue()

Description copied from class: NumberDistance

Get the value as double.

Specified by:

doubleValue in class NumberDistance<FloatDistance,Float>

Returns:

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

floatValue

public float floatValue()

Description copied from class: NumberDistance

Get the value as float.

Overrides:

floatValue in class NumberDistance<FloatDistance,Float>

Returns:

same result as getValue().floatValue() 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<FloatDistance,Float>

Returns:

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

compareTo

public int compareTo(FloatDistance other)

Description copied from class: NumberDistance

Compares this NumberDistance with the given NumberDistance wrt the represented value.

d1.compareTo(d2) is the same as Double.compare(d1.value.doubleValue(), d2.value.doubleValue()). Subclasses may need to overwrite this method if necessary.

Specified by:

compareTo in interface Comparable<FloatDistance>

Overrides:

compareTo in class NumberDistance<FloatDistance,Float>

Parameters:

other - Other object

Returns:

a negative integer, zero, or a positive integer as the value of this NumberDistance is less than, equal to, or greater than the value of the specified NumberDistance.

infiniteDistance

public FloatDistance infiniteDistance()

An infinite FloatDistance is based on Float.POSITIVE_INFINITY.

Returns:

an infinite distance

nullDistance

public FloatDistance nullDistance()

A null FloatDistance is based on 0.

Returns:

a null distance

undefinedDistance

public FloatDistance undefinedDistance()

An undefined FloatDistance is based on Float.NaN.

Returns:

an undefined distance

parseString

public FloatDistance parseString(String val)
                          throws IllegalArgumentException

As pattern is required a String defining a Float.

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<FloatDistance>

Overrides:

isInfiniteDistance in class AbstractDistance<FloatDistance>

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<FloatDistance>

Overrides:

isNullDistance in class AbstractDistance<FloatDistance>

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<FloatDistance>

Overrides:

isUndefinedDistance in class AbstractDistance<FloatDistance>

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<FloatDistance>

Returns:

Pattern