类图和管理员权限

Question

As an exercise, I would like to create a forum in Java EE, using JSF.

I'm a total nooby in class diagram.

I can't figure out if I need to create a class for the administrators.

For example, having a class User, then the admin class by inheritance. In that way, admins could do everything users do. But my issue is that I want different level of admin. Let's say, moderator, super admin etc... So I could create a role attribute saying which rights within the admin he has.

But in that case, is it useful to create an admin class, I could just make a user class with this role attribute which will say if user or admin and which admin etc.

I'm a bit lost.

Answer 1

Why do you need a different class? The most usual approach is just have a User class (call it something else because many DB don't like it), and each user have several Roles or Permissions .

That said, most probably you should not deal with this from within your application. Use the JAAS model and let the container deal with; your only use in the application could be assigning roles to users.