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3 years ago
  1. <?php
  2. /*
  3. * This file is part of the Symfony package.
  4. *
  5. * (c) Fabien Potencier <fabien@symfony.com>
  6. *
  7. * For the full copyright and license information, please view the LICENSE
  8. * file that was distributed with this source code.
  9. */
  10. namespace Symfony\Component\HttpKernel\Controller\ArgumentResolver;
  11. use Symfony\Component\HttpFoundation\Request;
  12. use Symfony\Component\HttpKernel\Controller\ArgumentValueResolverInterface;
  13. use Symfony\Component\HttpKernel\ControllerMetadata\ArgumentMetadata;
  14. /**
  15. * Yields the default value defined in the action signature when no value has been given.
  16. *
  17. * @author Iltar van der Berg <kjarli@gmail.com>
  18. */
  19. final class DefaultValueResolver implements ArgumentValueResolverInterface
  20. {
  21. /**
  22. * {@inheritdoc}
  23. */
  24. public function supports(Request $request, ArgumentMetadata $argument): bool
  25. {
  26. return $argument->hasDefaultValue() || (null !== $argument->getType() && $argument->isNullable() && !$argument->isVariadic());
  27. }
  28. /**
  29. * {@inheritdoc}
  30. */
  31. public function resolve(Request $request, ArgumentMetadata $argument): iterable
  32. {
  33. yield $argument->hasDefaultValue() ? $argument->getDefaultValue() : null;
  34. }
  35. }