MaybeUnitizedDouble.java

package org.andork.unit;

import java.util.Objects;

public class MaybeUnitizedDouble<T extends UnitType<T>> extends MaybeUnitizedNumber<T> {
	private final double value;

	public MaybeUnitizedDouble(double value, Unit<T> unit) {
		super(unit);
		this.value = value;
	}

	@Override
	public double doubleValue(Unit<T> unit, Unit<T> defaultUnit) {
		Unit<T> actual = unit == null ? defaultUnit : unit;
		if (unit == actual) {
			return value;
		}
		return unit.type.convert(value, actual, unit);
	}

	@Override
	public boolean equals(Object o) {
		if (o instanceof MaybeUnitizedDouble) {
			MaybeUnitizedDouble<?> u = (MaybeUnitizedDouble<?>) o;
			return value == u.value && unit == u.unit;
		}
		return false;
	}

	@Override
	public int hashCode() {
		return Double.hashCode(value) * 31 ^ Objects.hashCode(unit);
	}

	public MaybeUnitizedDouble<T> in(Unit<T> unit, Unit<T> defaultUnit) {
		Unit<T> actual = unit == null ? defaultUnit : unit;
		if (unit == actual) {
			return this;
		}
		return new MaybeUnitizedDouble<>(doubleValue(unit, defaultUnit), unit);
	}

	@Override
	public String toString() {
		if (unit == null) {
			return Double.toString(value);
		}
		return value + " " + unit;
	}
}