javax.measure.spi

Interface SystemOfUnits

public interface SystemOfUnits

A system of units grouped together for historical or cultural reasons.
Common system of units are "SI" (System International), "Imperial" (British), "US" (US Customary). Nothing prevents a unit from belonging to several systems of units at the same time (for example an Imperial system would have many of the units held by the US Customary system).

Version:

0.8, $Date: 2014-12-03 $

Author:

Jean-Marie Dautelle, Werner Keil

See Also:

Wikipedia: International System of Units, Wikipedia: System of measurement

Method Summary

Methods

Modifier and Type	Method and Description
String	getName()
<Q extends Quantity<Q>> Unit<Q>	getUnit(Class<Q> quantityType) Returns the default unit for the specified quantity.
Set<? extends Unit<?>>	getUnits() Returns a read only view over the units defined in this system.
Set<? extends Unit<?>>	getUnits(Dimension dimension) Returns the units defined in this system having the specified dimension (convenience method).

Method Detail

getName

String getName()

Returns:

a name

getUnit

<Q extends Quantity<Q>> Unit<Q> getUnit(Class<Q> quantityType)

Returns the default unit for the specified quantity.

Type Parameters:

Q - the compile-time quantity type.

Parameters:

quantityType - the quantity type.

Returns:

the unit for the specified quantity.

getUnits

Set<? extends Unit<?>> getUnits()

Returns a read only view over the units defined in this system.

Returns:

the collection of units.

getUnits

Set<? extends Unit<?>> getUnits(Dimension dimension)

Returns the units defined in this system having the specified dimension (convenience method).

Parameters:

dimension - the dimension of the units to be returned.

Returns:

the collection of units of specified dimension.