PowerUnit.java

// Copyright (c) FIRST and other WPILib contributors.
// Open Source Software; you can modify and/or share it under the terms of
// the WPILib BSD license file in the root directory of this project.
 
package org.wpilib.units;
 
import static org.wpilib.units.Units.Joules;
import static org.wpilib.units.Units.Seconds;
 
import org.wpilib.units.measure.Power;

public final class PowerUnit extends PerUnit<EnergyUnit, TimeUnit> {
  private static final CombinatoryUnitCache<EnergyUnit, TimeUnit, PowerUnit> cache =
      new CombinatoryUnitCache<>(PowerUnit::new);
 
  PowerUnit(EnergyUnit energy, TimeUnit time) {
    super(
        energy.isBaseUnit() && time.isBaseUnit()
            ? null
            : combine(energy.getBaseUnit(), time.getBaseUnit()),
        energy,
        time);
  }
 
  PowerUnit(
      PowerUnit baseUnit,
      UnaryFunction toBaseConverter,
      UnaryFunction fromBaseConverter,
      String name,
      String symbol) {
    super(baseUnit, toBaseConverter, fromBaseConverter, name, symbol);
  }

  public static PowerUnit combine(EnergyUnit energy, TimeUnit period) {
    return cache.combine(energy, period);
  }

  public static PowerUnit combine(VoltageUnit voltage, CurrentUnit current) {
    return combine(
        new EnergyUnit(
            Joules,
            voltage.toBaseUnits(1) * current.toBaseUnits(1),
            voltage.name() + "-" + current.name(),
            voltage.symbol() + "*" + current.symbol()),
        Seconds);
  }

  public static PowerUnit combine(CurrentUnit current, VoltageUnit voltage) {
    return combine(voltage, current);
  }

  public static PowerUnit combine(AngularVelocityUnit angularVelocity, TorqueUnit torque) {
    return combine(
        new EnergyUnit(Joules, angularVelocity.toBaseUnits(1) * torque.toBaseUnits(1), "", ""),
        Seconds);
  }

  public static PowerUnit combine(TorqueUnit torque, AngularVelocityUnit angularVelocity) {
    return combine(angularVelocity, torque);
  }
 
  @Override
  public PowerUnit getBaseUnit() {
    return (PowerUnit) super.getBaseUnit();
  }
 
  @Override
  public Power of(double magnitude) {
    return new Power(magnitude, toBaseUnits(magnitude), this);
  }
 
  @Override
  public Power ofBaseUnits(double baseUnitMagnitude) {
    return new Power(fromBaseUnits(baseUnitMagnitude), baseUnitMagnitude, this);
  }
 
  @Override
  public Power zero() {
    return (Power) super.zero();
  }
 
  @Override
  public Power one() {
    return (Power) super.one();
  }
 
  @Override
  public VelocityUnit<PowerUnit> per(TimeUnit time) {
    return VelocityUnit.combine(this, time);
  }

  public <U extends Unit> PerUnit<PowerUnit, U> per(U other) {
    return PerUnit.combine(this, other);
  }

  public double convertFrom(double magnitude, PowerUnit otherUnit) {
    return fromBaseUnits(otherUnit.toBaseUnits(magnitude));
  }
}