ucar.units
Class ScaledUnit

java.lang.Object
  ucar.units.UnitImpl
      ucar.units.ScaledUnit

All Implemented Interfaces:

Serializable, DerivableUnit, Unit

public final class ScaledUnit
extends UnitImpl
implements DerivableUnit

Provides support for a unit that is a mutiplicative factor of a reference unit. Instances of this class are immutable.

Version:

$Id: ScaledUnit.java 64 2006-07-12 22:30:50Z edavis $

Author:

Steven R. Emmerson

See Also:

Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class ucar.units.UnitImpl

UnitImpl.MyConverter

Constructor Summary

ScaledUnit(double scale)
Constructs from a multiplicative factor.

ScaledUnit(double scale, Unit unit)
Constructs from a multiplicative factor and a reference unit.

ScaledUnit(double scale, Unit unit, UnitName id)
Constructs from a multiplicative factor, a reference unit, and an identifier.

Method Summary

Unit	clone(UnitName id) Clones this unit, changing the identifier.
boolean	equals(Object object) Indicates if this unit is semantically identical to an object.
double	fromDerivedUnit(double amount) Converts a numeric value from the underlying derived unit to this unit.
double[]	fromDerivedUnit(double[] input, double[] output) Converts numeric values from the underlying derived unit to this unit.
float	fromDerivedUnit(float amount) Converts a numeric value from the underlying derived unit to this unit.
float[]	fromDerivedUnit(float[] input, float[] output) Converts numeric values from the underlying derived unit to this unit.
String	getCanonicalString() Returns the canonical string representation of the unit.
DerivedUnit	getDerivedUnit() Gets the derived unit underlying this unit.
double	getScale() Returns the multiplicative factor.
Unit	getUnit() Returns the reference unit.
int	hashCode() Returns the hash code of this instance.
boolean	isDimensionless() Indicates if this unit is dimensionless.
static void	main(String[] args) Tests this class.
Unit	multiplyBy(double scale) Multiplies this unit by a scale factor.
protected Unit	myDivideBy(Unit that) Divides this unit by another unit.
protected Unit	myDivideInto(Unit that) Divides this unit into another unit.
protected Unit	myMultiplyBy(Unit that) Multiplies this unit by another unit.
protected Unit	myRaiseTo(int power) Raises this unit to a power.
double	toDerivedUnit(double amount) Converts a numeric value from this unit to the underlying derived unit.
double[]	toDerivedUnit(double[] input, double[] output) Converts numeric values from this unit to the underlying derived unit.
float	toDerivedUnit(float amount) Converts a numeric value from this unit to the underlying derived unit.
float[]	toDerivedUnit(float[] input, float[] output) Converts numeric values from this unit to the underlying derived unit.
String	toString() Returns the string representation of this unit.

Methods inherited from class ucar.units.UnitImpl

convertTo, convertTo, convertTo, convertTo, convertTo, convertTo, divideBy, divideInto, getConverterTo, getName, getPlural, getSymbol, getUnitName, isCompatible, log, makeLabel, multiplyBy, raiseTo, shiftTo, shiftTo

Methods inherited from class java.lang.Object

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

Constructor Detail

ScaledUnit

public ScaledUnit(double scale)

Constructs from a multiplicative factor. Returns a dimensionless unit whose value is the multiplicative factor rather than unity.

Parameters:

scale - The multiplicative factor.

ScaledUnit

public ScaledUnit(double scale,
                  Unit unit)

Constructs from a multiplicative factor and a reference unit.

Parameters:

scale - The multiplicative factor.

unit - The reference unit.

ScaledUnit

public ScaledUnit(double scale,
                  Unit unit,
                  UnitName id)

Constructs from a multiplicative factor, a reference unit, and an identifier.

Parameters:

scale - The multiplicative factor.

unit - The reference unit.

id - The identifier for the unit.

Method Detail

getScale

public double getScale()

Returns the multiplicative factor.

Returns:

The multiplicative factor.

getUnit

public Unit getUnit()

Returns the reference unit.

Returns:

The reference unit.

clone

public Unit clone(UnitName id)

Clones this unit, changing the identifier.

Specified by:

clone in interface Unit

Parameters:

id - The new identifier.

Returns:

A ScaledUnit with the new identifier.

multiplyBy

public Unit multiplyBy(double scale)
                throws MultiplyException

Description copied from interface: Unit

Multiplies this unit by a scale factor. For example, if m is a meter unit, then m.multiplyBy(1e-2) returns a centimeter unit.

Specified by:

multiplyBy in interface Unit

Overrides:

multiplyBy in class UnitImpl

Parameters:

scale - The scale factor.

Returns:

The result of multiplying this unit by the scale factor.

Throws:

MultiplyException - if scale is zero.

myMultiplyBy

protected Unit myMultiplyBy(Unit that)
                     throws MultiplyException

Multiplies this unit by another unit.

Specified by:

myMultiplyBy in class UnitImpl

Parameters:

that - The other unit.

Returns:

The product of this unit and the other unit.

Throws:

MultiplyException - Can't multiply these units together.

myDivideBy

protected Unit myDivideBy(Unit that)
                   throws OperationException

Divides this unit by another unit.

Specified by:

myDivideBy in class UnitImpl

Parameters:

that - The other unit.

Returns:

The quotient of this unit divided by the other unit.

Throws:

OperationException - Can't divide these units.

myDivideInto

protected Unit myDivideInto(Unit that)
                     throws OperationException

Divides this unit into another unit.

Specified by:

myDivideInto in class UnitImpl

Parameters:

that - The other unit.

Returns:

The quotient of this unit divided into the other unit.

Throws:

OperationException - Can't divide these units.

myRaiseTo

protected Unit myRaiseTo(int power)
                  throws RaiseException

Raises this unit to a power.

Specified by:

myRaiseTo in class UnitImpl

Parameters:

power - The power.

Returns:

The result of raising this unit to the power.

Throws:

RaiseException - Can't raise this unit to a power.

getDerivedUnit

public DerivedUnit getDerivedUnit()

Gets the derived unit underlying this unit.

Specified by:

getDerivedUnit in interface DerivableUnit

Specified by:

getDerivedUnit in interface Unit

Returns:

The derived unit which underlies this unit.

toDerivedUnit

public float toDerivedUnit(float amount)
                    throws ConversionException

Converts a numeric value from this unit to the underlying derived unit.

Specified by:

toDerivedUnit in interface DerivableUnit

Parameters:

amount - The numeric value in this unit.

Returns:

The equivalent value in the underlying derived unit.

Throws:

ConversionException - Can't convert value to the underlying derived unit.

toDerivedUnit

public double toDerivedUnit(double amount)
                     throws ConversionException

Converts a numeric value from this unit to the underlying derived unit.

Specified by:

toDerivedUnit in interface DerivableUnit

Parameters:

amount - The numeric value in this unit.

Returns:

The equivalent value in the underlying derived unit.

Throws:

ConversionException - Can't convert value to the underlying derived unit.

toDerivedUnit

public float[] toDerivedUnit(float[] input,
                             float[] output)
                      throws ConversionException

Converts numeric values from this unit to the underlying derived unit.

Specified by:

toDerivedUnit in interface DerivableUnit

Parameters:

input - The numeric values in this unit.

output - The equivalent values in the underlying derived unit.

Returns:

output.

Throws:

ConversionException - Can't convert values to the underlying derived unit.

toDerivedUnit

public double[] toDerivedUnit(double[] input,
                              double[] output)
                       throws ConversionException

Converts numeric values from this unit to the underlying derived unit.

Specified by:

toDerivedUnit in interface DerivableUnit

Parameters:

input - The numeric values in this unit.

output - The equivalent values in the underlying derived unit.

Returns:

output.

Throws:

ConversionException - Can't convert values to the underlying derived unit.

fromDerivedUnit

public float fromDerivedUnit(float amount)
                      throws ConversionException

Converts a numeric value from the underlying derived unit to this unit.

Specified by:

fromDerivedUnit in interface DerivableUnit

Parameters:

amount - The numeric value in the underlying derived unit.

Returns:

The equivalent value in this unit.

Throws:

ConversionException - Can't convert value.

fromDerivedUnit

public double fromDerivedUnit(double amount)
                       throws ConversionException

Converts a numeric value from the underlying derived unit to this unit.

Specified by:

fromDerivedUnit in interface DerivableUnit

Parameters:

amount - The numeric value in the underlying derived unit.

Returns:

The equivalent value in this unit.

Throws:

ConversionException - Can't convert value.

fromDerivedUnit

public float[] fromDerivedUnit(float[] input,
                               float[] output)
                        throws ConversionException

Converts numeric values from the underlying derived unit to this unit.

Specified by:

fromDerivedUnit in interface DerivableUnit

Parameters:

input - The numeric values in the underlying derived unit.

output - The equivalent values in this unit.

Returns:

output.

Throws:

ConversionException - Can't convert values.

fromDerivedUnit

public double[] fromDerivedUnit(double[] input,
                                double[] output)
                         throws ConversionException

Converts numeric values from the underlying derived unit to this unit.

Specified by:

fromDerivedUnit in interface DerivableUnit

Parameters:

input - The numeric values in the underlying derived unit.

output - The equivalent values in this unit.

Returns:

output.

Throws:

ConversionException - Can't convert values.

equals

public boolean equals(Object object)

Indicates if this unit is semantically identical to an object.

Specified by:

equals in interface Unit

Overrides:

equals in class Object

Parameters:

object - The object.

Returns:

true if an only if this unit is semantically identical to object .

hashCode

public int hashCode()

Returns the hash code of this instance.

Specified by:

hashCode in class UnitImpl

Returns:

The hash code of this instance.

isDimensionless

public boolean isDimensionless()

Indicates if this unit is dimensionless. A ScaledUnit is dimensionless if and only if the reference unit is dimensionless.

Specified by:

isDimensionless in interface Unit

Returns:

true if and only if this unit is dimensionless.

toString

public String toString()

Returns the string representation of this unit.

Specified by:

toString in interface Unit

Overrides:

toString in class UnitImpl

Returns:

The string representation of this unit.

getCanonicalString

public String getCanonicalString()

Returns the canonical string representation of the unit.

Specified by:

getCanonicalString in interface Unit

Returns:

The canonical string representation.

main

public static void main(String[] args)
                 throws Exception

Tests this class.

Throws:

Exception