javax.measure.converter
Class MultiplyConverter

java.lang.Object
  javax.measure.converter.UnitConverter
      javax.measure.converter.MultiplyConverter

All Implemented Interfaces:

java.io.Serializable

public final class MultiplyConverter
extends UnitConverter

This class represents a converter multiplying numeric values by a constant scaling factor (approximated as a double). For exact scaling conversions RationalConverter is preferred.

Instances of this class are immutable.

Version:

3.1, April 22, 2006

Author:

Jean-Marie Dautelle

See Also:

Serialized Form

Field Summary

Fields inherited from class javax.measure.converter.UnitConverter

IDENTITY

Constructor Summary

MultiplyConverter(double factor)
Creates a multiply converter with the specified scale factor.

Method Summary

UnitConverter	concatenate(UnitConverter converter) Concatenates this converter with another converter.
double	convert(double amount) Converts a double value.
boolean	equals(java.lang.Object obj) Indicates whether this converter is considered the same as the converter specified (they must be of same types).
double	getFactor() Returns the scale factor.
int	hashCode() Returns a hash code value for this converter.
UnitConverter	inverse() Returns the inverse of this converter.
boolean	isLinear() Indicates if this converter is linear.

Methods inherited from class java.lang.Object

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

Constructor Detail

MultiplyConverter

public MultiplyConverter(double factor)

Creates a multiply converter with the specified scale factor.

Parameters:

factor - the scale factor.

Throws:

java.lang.IllegalArgumentException - if offset is one (or close to one).

Method Detail

getFactor

public double getFactor()

Returns the scale factor.

Returns:

the scale factor.

inverse

public UnitConverter inverse()

Description copied from class: UnitConverter

Returns the inverse of this converter. If x is a valid value, then x == inverse().convert(convert(x)) to within the accuracy of computer arithmetic.

Specified by:

inverse in class UnitConverter

Returns:

the inverse of this converter.

convert

public double convert(double amount)

Description copied from class: UnitConverter

Converts a double value.

Specified by:

convert in class UnitConverter

Parameters:

amount - the numeric value to convert.

Returns:

the converted numeric value.

isLinear

public boolean isLinear()

Description copied from class: UnitConverter

Indicates if this converter is linear. A converter is linear if convert(u + v) == convert(u) + convert(v) and convert(r * u) == r * convert(u). For linear converters the following property always hold:

     y1 = c1.convert(x1);
     y2 = c2.convert(x2); 
 then y1*y2 = c1.concatenate(c2).convert(x1*x2)

Specified by:

isLinear in class UnitConverter

Returns:

true if this converter is linear; false otherwise.

equals

public boolean equals(java.lang.Object obj)

Description copied from class: UnitConverter

Indicates whether this converter is considered the same as the converter specified (they must be of same types).

Specified by:

equals in class UnitConverter

Parameters:

obj - the converter with which to compare.

Returns:

true if the specified object is a converter considered equals to this converter;false otherwise.

hashCode

public int hashCode()

Description copied from class: UnitConverter

Returns a hash code value for this converter. Equals object have equal hash codes.

Specified by:

hashCode in class UnitConverter

Returns:

this converter hash code value.

See Also:

UnitConverter.equals(java.lang.Object)

concatenate

public UnitConverter concatenate(UnitConverter converter)

Description copied from class: UnitConverter

Concatenates this converter with another converter. The resulting converter is equivalent to first converting by the specified converter, and then converting by this converter.

Note: Implementations must ensure that the UnitConverter.IDENTITY instance is returned if the resulting converter is an identity converter.

Overrides:

concatenate in class UnitConverter

Parameters:

converter - the other converter.

Returns:

the concatenation of this converter with the other converter.