Quantity.java

package mf;

/*Generated by MPS */


public class Quantity {
  protected double myAmount;
  protected Unit myUnit;
  protected Quantity() {
  }
  public Quantity(double amount, Unit unit) {
    requireNonNull(unit);
    myAmount = amount;
    myUnit = unit;
  }
  public Quantity(int amount, Unit unit) {
    this((double) amount, unit);
  }
  public Quantity(String amountString, Unit unit) {
    this(new Double(amountString), unit);
  }
  public Quantity abs() {
    return ((isPositive()) ? this : newObject(Math.abs(getAmount()), myUnit));
  }
  public Quantity add(Quantity arg) {
    requireSameUnitsAs(arg);
    return newObject(getAmount() + arg.getAmount(), myUnit);
  }
  public String amountString() {
    return String.valueOf(getAmount());
  }
  public Quantity divide(double arg) {
    return newObject(getAmount() / arg, myUnit);
  }
  @Override
  public boolean equals(Object arg) {
    if (!((arg instanceof Quantity))) {
      return false;
    }
    Quantity other = (Quantity) arg;
    return (myUnit.equals(other.myUnit) && (getAmount() == other.getAmount()));
  }
  public double getAmount() {
    return myAmount;
  }
  public boolean isGreaterThan(Quantity arg) {
    requireSameUnitsAs(arg);
    return !(isLessThanOrEqualTo(arg));
  }
  public boolean isGreaterThanOrEqualTo(Quantity arg) {
    requireSameUnitsAs(arg);
    return !(isLessThan(arg));
  }
  public boolean isLessThan(Quantity arg) {
    requireSameUnitsAs(arg);
    return getAmount() < arg.getAmount();
  }
  public boolean isLessThanOrEqualTo(Quantity arg) {
    requireSameUnitsAs(arg);
    return isLessThan(arg) || equals(arg);
  }
  public boolean isNegative() {
    return (getAmount() < 0);
  }
  public boolean isNull() {
    return false;
  }
  public boolean isPositive() {
    return !(isNegative());
  }
  public Quantity max(Quantity arg) {
    return ((isGreaterThan(arg)) ? this : arg);
  }
  public Quantity min(Quantity arg) {
    return ((isLessThan(arg)) ? this : arg);
  }
  public Quantity multiply(double arg) {
    return newObject(getAmount() * arg, myUnit);
  }
  protected Quantity newObject(double amount, Unit unit) {
    return new Quantity(amount, unit);
  }
  public boolean notEquals(Quantity arg) {
    return !(this.equals(arg));
  }
  protected void requireNonNull(Object arg) {
    if (arg == null) {
      throw new NullPointerException(toString() + " ran into nil");
    }
  }
  protected void requireSameUnitsAs(Quantity arg) {
    if (!(myUnit.equals(arg.unit()))) {
      throw new IllegalArgumentException();
    }
  }
  public Quantity subtract(Quantity arg) {
    requireSameUnitsAs(arg);
    return newObject(getAmount() - arg.getAmount(), myUnit);
  }
  @Override
  public String toString() {
    return String.valueOf(getAmount()) + " " + myUnit.toString();
  }
  public Unit unit() {
    return myUnit;
  }
}