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<?php |
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namespace Digia\GraphQL\Type\Definition; |
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use Digia\GraphQL\Config\ConfigObject; |
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use Digia\GraphQL\Error\InvariantException; |
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use Digia\GraphQL\Language\Node\NodeAwareInterface; |
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use Digia\GraphQL\Language\Node\NodeTrait; |
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use Digia\GraphQL\Language\Node\UnionTypeDefinitionNode; |
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use function Digia\GraphQL\Type\resolveThunk; |
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use function Digia\GraphQL\Util\invariant; |
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/** |
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* Union Type Definition |
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* |
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* When a field can return one of a heterogeneous set of types, a Union type |
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* is used to describe what types are possible as well as providing a function |
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* to determine which type is actually used when the field is resolved. |
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* |
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* Example: |
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* |
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* $PetType = GraphQLUnionType([ |
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* 'name' => 'Pet', |
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* 'types' => [$DogType, $CatType], |
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* 'resolveType' => function ($value) { |
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* if ($value instanceof Dog) { |
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* return $DogType; |
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* } |
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* if ($value instanceof Cat) { |
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* return $CatType; |
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* } |
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* } |
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* ]); |
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*/ |
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class UnionType extends ConfigObject implements AbstractTypeInterface, NamedTypeInterface, CompositeTypeInterface, |
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OutputTypeInterface, NodeAwareInterface |
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{ |
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use NameTrait; |
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use DescriptionTrait; |
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use ResolveTypeTrait; |
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use NodeTrait; |
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/** |
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* @var array|callable |
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*/ |
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protected $typesOrThunk; |
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/** |
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* @var TypeInterface[] |
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*/ |
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protected $typeMap; |
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/** |
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* @inheritdoc |
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*/ |
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protected function afterConfig(): void |
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{ |
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invariant(null !== $this->getName(), 'Must provide name.'); |
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} |
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/** |
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* @return NamedTypeInterface[] |
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* @throws InvariantException |
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*/ |
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public function getTypes(): array |
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{ |
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// Types are built lazily to avoid concurrency issues. |
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if (!isset($this->typeMap)) { |
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$this->typeMap = $this->buildTypeMap($this->typesOrThunk ?? []); |
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} |
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return $this->typeMap; |
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} |
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/** |
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* Unions are created using the `ConfigAwareTrait` constructor which will automatically |
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* call this method when setting arguments from `$config['types']`. |
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* |
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* @param array|callable $typesOrThunk |
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* @return UnionType |
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*/ |
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protected function setTypes($typesOrThunk): UnionType |
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{ |
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$this->typesOrThunk = $typesOrThunk; |
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return $this; |
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} |
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/** |
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* @param array|callable $typesOrThunk |
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* @return array |
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* @throws InvariantException |
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*/ |
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protected function buildTypeMap($typesOrThunk): array |
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{ |
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$typeMap = resolveThunk($typesOrThunk); |
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invariant( |
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\is_array($typeMap), |
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\sprintf( |
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'Must provide Array of types or a function which returns such an array for Union %s.', |
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$this->getName() |
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) |
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); |
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return $typeMap; |
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} |
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} |
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digiaonline /
graphql-php
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