public function getAll($query, $limit, $offset)
    {
        // TODO: user query
        $users = $this->userManager->findBy(array(), array('lastname' => 'ASC'), $limit, $offset);

        $data = array();
        foreach ($users as $user) {
            $data[] = array(
                'securityType' => get_class($user),
                'securityId' => $user->getId(),
                'securityName' => $user->getDisplayName(),
            );
        }

        return array(
            'total' => $this->userManager->countAll(),
            'data' => $data,
        );
    }