public function removeRole(Role $role)
    {
        $this->initializeRoles();
        if ($this->hasRole($role)) {
            $roleIdentifier = $role->getIdentifier();
            unset($this->roles[$roleIdentifier]);
            $identifierIndex = array_search($roleIdentifier, $this->roleIdentifiers);
            unset($this->roleIdentifiers[$identifierIndex]);
        }
    }