Units of Measurement
Role: owner
Tags: java, scientific computing
License: Apache license 2.0
Link: https://github.com/netomi/uom
This library is my take on JSR-385 to provide a useful API for representing physical measurements and perform conversions between different units.
Its not a reference implementation of the Units of Measurement API due to technical limitations of the latter one. Instead it takes many of the concepts of the released API and builds a full-fledged units of measurement library around them to be able to represent physical measurements in different units with arbitrary precision.
The design goal of the library is to include:
- fully typed quantities:
Length l1 = Length.of(1, SI.METER);
Length l2 = Length.ofMeter(2);- transparent support for double and arbitrary decimal precision quantities (using BigDecimal):
Length doubleLength = Quantities.createQuantity(1, SI.METER, Length.class);
Length decimalLength = Quantities.createQuantity(BigDecimal.ONE, Imperial.YARD, Length.class);
Length l3 = l1.add(l2);- support for generic quantities:
Quantity<Speed> speed = Quantities.createGeneric(1, SI.METER_PER_SECOND);
System.out.println(speed.add(Speed.ofMeterPerSecond(2))); // -> prints 3 m/s- support for quantity factories:
QuantityFactory<Length> factory = DoubleQuantity.factory(Length.class);
Length l1 = factory.create(1, SI.METRE);
// default factories can be replaced
// use decimal precision with MathContext DECIMAL128 for every quantity of type Length:
Quantities.registerQuantityFactory(Length.class, DecimalQuantity.factory(MathContext.DECIMAL128, Length.class));
// quantity factories with pooling behavior can be registered
QuantityFactory<Length> myPoolFactory = ...;
Quantities.registerQuantityFactory(Length.class, myPoolFactory);