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<?php
declare(strict_types=1);
namespace Doctrine\ORM\Utility;
use Doctrine\ORM\EntityManagerInterface;
use Doctrine\Persistence\Mapping\ClassMetadata;
/** @internal This class exists only to avoid code duplication, do not reuse it externally */
final class HierarchyDiscriminatorResolver
{
private function __construct()
{
}
/**
* This method is needed to make INSTANCEOF work correctly with inheritance: if the class at hand has inheritance,
* it extracts all the discriminators from the child classes and returns them
*
* @return null[]
* @psalm-return array<array-key, null>
*/
public static function resolveDiscriminatorsForClass(
ClassMetadata $rootClassMetadata,
EntityManagerInterface $entityManager
): array {
$hierarchyClasses = $rootClassMetadata->subClasses;
$hierarchyClasses[] = $rootClassMetadata->name;
$discriminators = [];
foreach ($hierarchyClasses as $class) {
$currentMetadata = $entityManager->getClassMetadata($class);
$currentDiscriminator = $currentMetadata->discriminatorValue;
if ($currentDiscriminator !== null) {
$discriminators[$currentDiscriminator] = null;
}
}
return $discriminators;
}
}
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