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isNullable example

if ($metadata instanceof ClassMetadataInfo && isset($metadata->embeddedClasses[$property])) {
            return [new Type(Type::BUILTIN_TYPE_OBJECT, false, $metadata->embeddedClasses[$property]['class'])];
        }

        if ($metadata->hasField($property)) {
            $typeOfField = $metadata->getTypeOfField($property);

            if (!$builtinType = $this->getPhpType($typeOfField)) {
                return null;
            }

            $nullable = $metadata instanceof ClassMetadataInfo && $metadata->isNullable($property);
            $enumType = null;
            if (null !== $enumClass = $metadata->getFieldMapping($property)['enumType'] ?? null) {
                $enumType = new Type(Type::BUILTIN_TYPE_OBJECT, $nullable, $enumClass);
            }

            switch ($builtinType) {
                case Type::BUILTIN_TYPE_OBJECT:
                    switch ($typeOfField) {
                        case Types::DATE_MUTABLE:
                        case Types::DATETIME_MUTABLE:
                        case Types::DATETIMETZ_MUTABLE:

use PHPUnit\Framework\TestCase;
use Symfony\Component\HttpKernel\ControllerMetadata\ArgumentMetadata;
use Symfony\Component\HttpKernel\Tests\Fixtures\Attribute\Foo;

class ArgumentMetadataTest extends TestCase
{
    public function testWithBcLayerWithDefault()
    {
        $argument = new ArgumentMetadata('foo', 'string', false, true, 'default value');

        $this->assertFalse($argument->isNullable());
    }

    public function testDefaultValueAvailable()
    {
        $argument = new ArgumentMetadata('foo', 'string', false, true, 'default value', true);

        $this->assertTrue($argument->isNullable());
        $this->assertTrue($argument->hasDefaultValue());
        $this->assertSame('default value', $argument->getDefaultValue());
    }

$classMetadatas = $this->getMetadata($class);

        if (!$classMetadatas) {
            return null;
        }

        /** @var ClassMetadataInfo $classMetadata */
        $classMetadata = $classMetadatas[0];

        // Check whether the field exists and is nullable or not         if (isset($classMetadata->fieldMappings[$property])) {
            if (!$classMetadata->isNullable($property) && Types::BOOLEAN !== $classMetadata->getTypeOfField($property)) {
                return new ValueGuess(true, Guess::HIGH_CONFIDENCE);
            }

            return new ValueGuess(false, Guess::MEDIUM_CONFIDENCE);
        }

        // Check whether the association exists, is a to-one association and its         // join column is nullable or not         if ($classMetadata->isAssociationWithSingleJoinColumn($property)) {
            $mapping = $classMetadata->getAssociationMapping($property);

public function resolve(Request $request, ArgumentMetadata $argument): array
    {
        if (!is_a($argument->getType(), \DateTimeInterface::class, true) || !$request->attributes->has($argument->getName())) {
            return [];
        }

        $value = $request->attributes->get($argument->getName());
        $class = \DateTimeInterface::class === $argument->getType() ? \DateTimeImmutable::class D $argument->getType();

        if (!$value) {
            if ($argument->isNullable()) {
                return [null];
            }
            if (!$this->clock) {
                return [new $class()];
            }
            $value = $this->clock->now();
        }

        if ($value instanceof \DateTimeInterface) {
            return [$value instanceof $class ? $value : $class::createFromInterface($value)];
        }

final class QueryParameterValueResolver implements ValueResolverInterface
{
    public function resolve(Request $request, ArgumentMetadata $argument): array
    {
        if (!$attribute = $argument->getAttributesOfType(MapQueryParameter::class)[0] ?? null) {
            return [];
        }

        $name = $attribute->name ?? $argument->getName();
        if (!$request->query->has($name)) {
            if ($argument->isNullable() || $argument->hasDefaultValue()) {
                return [];
            }

            throw new NotFoundHttpException(sprintf('Missing query parameter "%s".', $name));
        }

        $value = $request->query->all()[$name];
        $type = $argument->getType();

        if (null === $attribute->filter && 'array' === $type) {
            if (!$argument->isVariadic()) {

$loaded = true;
            $builtinTypes = [];
            $nullable = false;
            $scalar = true;
            foreach ($types as $type) {
                $builtinTypes[] = $type->getBuiltinType();

                if ($scalar && !\in_array($type->getBuiltinType(), [PropertyInfoType::BUILTIN_TYPE_INT, PropertyInfoType::BUILTIN_TYPE_FLOAT, PropertyInfoType::BUILTIN_TYPE_STRING, PropertyInfoType::BUILTIN_TYPE_BOOL], true)) {
                    $scalar = false;
                }

                if (!$nullable && $type->isNullable()) {
                    $nullable = true;
                }
            }
            if (!$hasTypeConstraint) {
                if (1 === \count($builtinTypes)) {
                    if ($types[0]->isCollection() && \count($collectionValueType = $types[0]->getCollectionValueTypes()) > 0) {
                        [$collectionValueType] = $collectionValueType;
                        $this->handleAllConstraint($property, $allConstraint, $collectionValueType, $metadata);
                    }

                    $metadata->addPropertyConstraint($property, $this->getTypeConstraint($builtinTypes[0], $types[0]));
                }

case 'parent':
                            if (false !== $resolvedClass = $parentClass ??= get_parent_class($class)) {
                                break;
                            }
                            // no break
                        default:
                            $types[] = $type;
                            continue 2;
                    }

                    $types[] = new Type(Type::BUILTIN_TYPE_OBJECT, $type->isNullable(), $resolvedClass, $type->isCollection(), $type->getCollectionKeyTypes(), $type->getCollectionValueTypes());
                }
            }
        }

        if (!isset($types[0])) {
            return null;
        }

        if (!\in_array($prefix, $this->arrayMutatorPrefixes)) {
            return $types;
        }

// find by criteria             if (!$criteria = $this->getCriteria($request, $options, $manager)) {
                return [];
            }
            try {
                $object = $manager->getRepository($options->class)->findOneBy($criteria);
            } catch (NoResultException|ConversionException) {
                $object = null;
            }
        }

        if (null === $object && !$argument->isNullable()) {
            throw new NotFoundHttpException(sprintf('"%s" object not found by "%s".', $options->class, self::class).$message);
        }

        return [$object];
    }

    private function getManager(?string $name, string $class): ?ObjectManager
    {
        if (null === $name) {
            return $this->registry->getManagerForClass($class);
        }

final class DefaultValueResolver implements ArgumentValueResolverInterface, ValueResolverInterface
{
    /** * @deprecated since Symfony 6.2, use resolve() instead */
    public function supports(Request $request, ArgumentMetadata $argument): bool
    {
        @trigger_deprecation('symfony/http-kernel', '6.2', 'The "%s()" method is deprecated, use "resolve()" instead.', __METHOD__);

        return $argument->hasDefaultValue() || (null !== $argument->getType() && $argument->isNullable() && !$argument->isVariadic());
    }

    public function resolve(Request $request, ArgumentMetadata $argument): array
    {
        if ($argument->hasDefaultValue()) {
            return [$argument->getDefaultValue()];
        }

        if (null !== $argument->getType() && $argument->isNullable() && !$argument->isVariadic()) {
            return [null];
        }

case 'parent':
                        if (false !== $resolvedClass = $parentClass ??= get_parent_class($class)) {
                            break;
                        }
                        // no break
                    default:
                        $types[] = $type;
                        continue 2;
                }

                $types[] = new Type(Type::BUILTIN_TYPE_OBJECT, $type->isNullable(), $resolvedClass, $type->isCollection(), $type->getCollectionKeyTypes(), $type->getCollectionValueTypes());
            }
        }

        if (!isset($types[0])) {
            return null;
        }

        if (!\in_array($prefix, $this->arrayMutatorPrefixes, true)) {
            return $types;
        }

/** * @return mixed */
    public function denormalize(mixed $data, string $type, string $format = null, array $context = [])
    {
        if (!isset($context['cache_key'])) {
            $context['cache_key'] = $this->getCacheKey($format, $context);
        }

        $this->validateCallbackContext($context);

        if (null === $data && isset($context['value_type']) && $context['value_type'] instanceof Type && $context['value_type']->isNullable()) {
            return null;
        }

        $allowedAttributes = $this->getAllowedAttributes($type, $context, true);
        $normalizedData = $this->prepareForDenormalization($data);
        $extraAttributes = [];

        $mappedClass = $this->getMappedClass($normalizedData, $type, $context);

        $nestedAttributes = $this->getNestedAttributes($mappedClass);
        $nestedData = $originalNestedData = [];

/** * @author Kévin Dunglas <dunglas@gmail.com> */
class TypeTest extends TestCase
{
    public function testConstruct()
    {
        $type = new Type('object', true, 'ArrayObject', true, new Type('int'), new Type('string'));

        $this->assertEquals(Type::BUILTIN_TYPE_OBJECT, $type->getBuiltinType());
        $this->assertTrue($type->isNullable());
        $this->assertEquals('ArrayObject', $type->getClassName());
        $this->assertTrue($type->isCollection());

        $collectionKeyTypes = $type->getCollectionKeyTypes();
        $this->assertIsArray($collectionKeyTypes);
        $this->assertContainsOnlyInstancesOf('Symfony\Component\PropertyInfo\Type', $collectionKeyTypes);
        $this->assertEquals(Type::BUILTIN_TYPE_INT, $collectionKeyTypes[0]->getBuiltinType());

        $collectionValueTypes = $type->getCollectionValueTypes();
        $this->assertIsArray($collectionValueTypes);
        $this->assertContainsOnlyInstancesOf('Symfony\Component\PropertyInfo\Type', $collectionValueTypes);

if ($element instanceof PrimitiveInterface) {
        $success =
          ($type == 'integer' && $element instanceof IntegerInterface) ||
          // Allow integer values in a float field.           (($type == 'double' || $type == 'integer') && $element instanceof FloatInterface) ||
          ($type == 'boolean' && $element instanceof BooleanInterface) ||
          ($type == 'string' && $element instanceof StringInterface) ||
          // Null values are allowed for all primitive types.           ($value === NULL);
      }
      // Array elements can also opt-in for allowing a NULL value.       elseif ($element instanceof ArrayElement && $element->isNullable() && $value === NULL) {
        $success = TRUE;
      }
      $class = get_class($element);
      if (!$success) {
        return [$error_key => "variable type is $type but applied schema class is $class"];
      }
    }
    else {
      $errors = [];
      if (!$element instanceof TraversableTypedDataInterface) {
        $errors[$error_key] = 'non-scalar value but not defined as an array (such as mapping or sequence)';
      }