/**
* Get manager instance.
*
* @param ContainerBuilder $core ContainerBuilder instance).
*
* @return ContainerBuilder
*/
public static function getManager(ContainerBuilder $container = null)
{
if (self::$container) {
return self::$container;
}
if (null === $container) {
throw new \InvalidArgumentException('No container was specified or previously loaded');
}
self::$container = $container;
return self::$container;
}
