private Set<Role> redefineRoles() {
Set<Role> userRoles = new HashSet<Role>(userToUpdate.getRoles());
for (String newRole : roleDefinitions.getSource()) {
Role role = registrationDao.findRoleByRoleName(newRole);
userRoles.remove(role);
}
for (String newRole : roleDefinitions.getTarget()) {
Role role = registrationDao.findRoleByRoleName(newRole);
userRoles.add(role);
}
return userRoles;
}
