package board

type Identity struct {
	ID int
}

// SetID updates the ID value with a valid ID value
// only if the ID is unset (i.e. < 1).
func (i *Identity) SetID(id int) error {
	if id < 1 {
		return InvalidIDError{id}
	}

	if i.ID > 0 {
		return IDAlreadySetError{}
	}

	i.ID = id

	return nil
}

// GetID returns the ID value.
func (i *Identity) GetID() int {
	return i.ID
}