/**
* @param array|string $obj
* @throws ApplicationException
* @throws UnauthorizedException
*/
public function __construct($obj)
{
if (is_array($obj)) {
$this->playlist = $obj;
} else {
if (is_scalar($obj)) {
$this->playlist = PlaylistDao::get($obj);
} else {
throw new ApplicationException("Wrong type of argument");
}
}
$this->checkPermission();
}