class SubmissionStrategyFactory implements ServiceSubscriberInterface
{
 public function __construct(private readonly ContainerInterface $locator)
 {
 }
 public function getStrategy(IllustrationSubmission $submission): SubmissionStrategyInterface
 {
 if ($submission->getIllustrationFile()) {
 return $this->locator->get('upload');
 }
 return $this->locator->get('url');
 }
 public static function getSubscribedServices(): iterable
 {
 yield 'upload' => UploadStrategy::class;
 yield 'url' => UrlStrategy::class;
 }
}