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<?php
/* --------------------------------------------------------------
   UserConfigurationReader.inc.php 2015-10-05 gm
   Gambio GmbH
   http://www.gambio.de
   Copyright (c) 2015 Gambio GmbH
   Released under the GNU General Public License (Version 2)
   [http://www.gnu.org/licenses/gpl-2.0.html]
   --------------------------------------------------------------
*/

/**
 * Class UserConfigurationReader
 *
 * @category   System
 * @package    UserConfiguration
 * @subpackage Repository
 */
class UserConfigurationReader implements UserConfigurationReaderInterface
{
    /**
     * @var CI_DB_query_builder
     */
    protected $db;


    public function __construct(CI_DB_query_builder $db)
    {
        $this->db = $db;
    }


    /**
     * @override
     */
    public function getUserConfiguration(IdType $userId, $configurationKey)
    {
        $result = $this->db->select('configuration_value')
                           ->from('user_configuration')
                           ->where(array('customer_id' => (string)$userId, 'configuration_key' => $configurationKey))
                           ->get()
                           ->row_array(0);

        return !is_null($result) ? $result['configuration_value'] : null;
    }
}