public function getPermissions()
    {
        $mode     = \RecursiveIteratorIterator::CHILD_FIRST;
        $iterator = $this->createRecursiveIterator($mode);

        $permissions = [];

        /** @var $child RoleInterface */
        foreach ($iterator as $child) {
            $permissions = array_replace_recursive($permissions, $child->getPermissions());
        }

        return array_replace_recursive($permissions, $this->permissions);
    }