/**
* method to retrieve the tariff instance
*
* @return Billrun_Subscriber
*/
public static function tariff()
{
if (!self::$tariff) {
$tariffSettings = self::config()->getConfigValue('tariff', array());
self::$tariff = Billrun_Tariff::getInstance($tariffSettings);
}
return self::$tariff;
}
/**
* Singleton of tariff class
*
* @param array $options the options of the instance
*
* @return type
*/
public static function getInstance(array $options = array())
{
if (!isset(self::$instance)) {
self::$instance = new self($options);
}
return self::$instance;
}
