How to properly use isUserInRole(role)

To prevent a user role from performing an action.

1. Example 1: The role "administrator" is the only role allowed to perform destroy action.
2. Example 2: Any role different from "guest" can perform CREATE action.

In a real case, I have this:

public String delete() {
 if(FacesContext.getCurrentInstance().getExternalContext().isUserInRole("administrator"){
   //.....the action to perform
 }
 return "Denied";
}

I wish I could use the annotation @RolesAllowed() of EJB yet I am not using EJB but ManagedBeans. So the question is: Is there any way to use many roles at the same time? Some workaround! Example: If an action must be allowed to 3 roles (administrator, moderator, manager). I am obliged to do :

if (FacesContext.getCurrentInstance().getExternalContext().isUserInRole("administrator")
    || FacesContext.getCurrentInstance().getExternalContext().isUserInRole("manager") 
    || .....) {
  //....
}

And it is a pain to reproduce on all the methods. Something like hundreds of methods :(