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<?php |
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namespace Fubhy\GraphQL\Type\Definition\Types; |
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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 is |
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* used to describe what types are possible as well as providing a function to |
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* determine which type is actually used when the field is resolved. |
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*/ |
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class UnionType extends AbstractType implements OutputTypeInterface, CompositeTypeInterface, NullableTypeInterface, UnmodifiedTypeInterface |
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{ |
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/** |
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* @var array |
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*/ |
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protected $types; |
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/** |
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* @var callable|null |
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*/ |
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protected $typeResolver; |
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/** |
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* Constructor. |
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* |
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* @param string $name |
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* @param array $types |
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* @param callable|null $typeResolver |
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* @param string|null $description |
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*/ |
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public function __construct($name, array $types = [], callable $typeResolver = NULL, $description = NULL) |
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{ |
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parent::__construct($name, $description); |
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$nonObjectTypes = array_filter($types, function (TypeInterface $type) { |
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return !($type instanceof ObjectType); |
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}); |
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if (!empty($nonObjectTypes)) { |
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$nonObjectTypes = implode(', ', array_map(function ($type) { |
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return (string) $type; |
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}, $nonObjectTypes)); |
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throw new \LogicException(sprintf('Union %s may only contain object types, it cannot contain: %s.', (string) $this, $nonObjectTypes)); |
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} |
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$this->types = $types; |
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$this->typeResolver = $typeResolver; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function getPossibleTypes() |
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{ |
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return $this->types; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function addPossibleType(ObjectType $type) |
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{ |
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$this->types = array_unique($this->types + [$type]); |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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3 |
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public function isPossibleType(ObjectType $type) |
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{ |
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return in_array($type, $this->types, TRUE); |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function resolveType($value) |
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{ |
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if (isset($this->typeResolver)) { |
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return call_user_func($this->typeResolver, $value); |
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} |
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return $this->getTypeOf($value); |
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} |
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} |
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fubhy /
graphql-php
