javax.measure.converter
Class RationalConverter

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

All Implemented Interfaces:

java.io.Serializable

public final class RationalConverter
extends UnitConverter

This class represents a converter multiplying numeric values by an exact scaling factor (represented as the quotient of two long numbers).

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

RationalConverter(long dividend, long divisor)
Creates a rational converter with the specified dividend and divisor.

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 cvtr) Indicates whether this converter is considered the same as the converter specified (they must be of same types).
long	getDividend() Returns the dividend for this rational converter.
long	getDivisor() Returns the positive divisor for this rational converter.
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

RationalConverter

public RationalConverter(long dividend,
                         long divisor)

Creates a rational converter with the specified dividend and divisor.

Parameters:

dividend - the dividend.

divisor - the positive divisor.

Throws:

java.lang.IllegalArgumentException - if divisor < 0

java.lang.IllegalArgumentException - if dividend == divisor

Method Detail

getDividend

public long getDividend()

Returns the dividend for this rational converter.

Returns:

this converter dividend.

getDivisor

public long getDivisor()

Returns the positive divisor for this rational converter.

Returns:

this converter divisor.

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 cvtr)

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:

cvtr - 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.