public PackageBill(IEnumerable<Subscription> subscriptions, Money total)
{
Check.Argument.ArrayLenghtIsNotZero(subscriptions, nameof(subscriptions));
Check.Argument.IsNotNull(total, nameof(total));
this.subscriptions = subscriptions;
costings = new BillCostings(subscriptions.Sum(), total);
}
public CallCharge(TelephoneNumber called, TimeSpan duration, Money cost)
{
Check.Argument.IsNotNull(called, nameof(called));
Check.Argument.IsNotNull(cost, nameof(cost));
this.called = called;
this.duration = duration;
this.cost = cost;
}
public Money Subtract(Money money)
{
Check.Argument.IsNotNull(money, nameof(money));
return new Money(Value - money.Value);
}
public Money Add(Money money)
{
Check.Argument.IsNotNull(money, nameof(money));
return new Money(Value + money.Value);
}