public void removeRole(Role role, RoleDao dao) {
if (this.roles == null) this.roles = new HashSet<Role>();
this.roles.remove(role);
role.removeUser(this);
dao.update(role);
}
public void addRole(Role role, RoleDao dao) {
if (this.roles == null) this.roles = new HashSet<Role>();
this.roles.add(role);
role.addUser(this);
dao.update(role);
}
public boolean equals(Role otherRole) {
if (otherRole == null) return false;
if (this.getRole().equals(otherRole.getRole())) return true;
else return false;
}