|
public isPossibleType ( GraphQL\Type\Definition\AbstractType $abstractType, |
||
| $abstractType | GraphQL\Type\Definition\AbstractType | |
| $possibleType | ||
| 리턴 | boolean | |
/**
* Provided two composite types, determine if they "overlap". Two composite
* types overlap when the Sets of possible concrete types for each intersect.
*
* This is often used to determine if a fragment of a given type could possibly
* be visited in a context of another type.
*
* This function is commutative.
*/
static function doTypesOverlap(Schema $schema, CompositeType $typeA, CompositeType $typeB)
{
// Equivalent types overlap
if ($typeA === $typeB) {
return true;
}
if ($typeA instanceof AbstractType) {
if ($typeB instanceof AbstractType) {
// If both types are abstract, then determine if there is any intersection
// between possible concrete types of each.
foreach ($schema->getPossibleTypes($typeA) as $type) {
if ($schema->isPossibleType($typeB, $type)) {
return true;
}
}
return false;
}
/** @var $typeB ObjectType */
// Determine if the latter type is a possible concrete type of the former.
return $schema->isPossibleType($typeA, $typeB);
}
if ($typeB instanceof AbstractType) {
/** @var $typeA ObjectType */
// Determine if the former type is a possible concrete type of the latter.
return $schema->isPossibleType($typeB, $typeA);
}
// Otherwise the types do not overlap.
return false;
}
