public void Unregister(EndUserId endUserId)
{
var latestRegistration = Registrations.LastOrDefault();
if (latestRegistration == null)
{
throw new ValidationException("Robot is not registered");
}
latestRegistration.Apply(
registration =>
{
if (registration.EndUserId == endUserId)
{
var e = RobotUnregistered.Create();
Apply(e);
Append(Guid.NewGuid(), RobotUnregistered.EventType, e);
}
else
{
throw new ValidationException("Robot is registered to somebody else");
}
},
unregistration => throw new ValidationException("Robot is not registered")
);
}
private void Apply(RobotUnregistered e)
{
var latestRegistration = Registrations.LastOrDefault();
if (latestRegistration == null)
{
throw new InvalidOperationException("Robot is not already registered");
}
latestRegistration.Apply(
registration => { Registrations = Registrations.Add(RobotRegistration.Unregistration.Instance); },
unregistration => throw new InvalidOperationException("Robot is not already registered")
);
}
