class ImmutablePropertiesConstraintValidator

class ImmutablePropertiesConstraintValidator extends ConstraintValidator implements ContainerInjectionInterface {
    
    /**
     * Constructs an ImmutablePropertiesConstraintValidator object.
     *
     * @param \Drupal\Core\Entity\EntityTypeManagerInterface $entityTypeManager
     *   The entity type manager service.
     */
    public function __construct(EntityTypeManagerInterface $entityTypeManager) {
    }
    
    /**
     * {@inheritdoc}
     */
    public static function create(ContainerInterface $container) : static {
        return new static($container->get('entity_type.manager'));
    }
    
    /**
     * {@inheritdoc}
     */
    public function validate(mixed $value, Constraint $constraint) : void {
        assert($constraint instanceof ImmutablePropertiesConstraint);
        if (!$value instanceof ConfigEntityInterface) {
            throw new UnexpectedValueException($value, ConfigEntityInterface::class);
        }
        // This validation is irrelevant on new entities.
        if ($value->isNew()) {
            return;
        }
        $id = $value->getOriginalId() ?: $value->id();
        if (empty($id)) {
            throw new LogicException('The entity does not have an ID.');
        }
        $original = $this->entityTypeManager
            ->getStorage($value->getEntityTypeId())
            ->loadUnchanged($id);
        if (empty($original)) {
            throw new RuntimeException('The original entity could not be loaded.');
        }
        foreach ($constraint->properties as $name) {
            // The property must be concretely defined in the class.
            if (!property_exists($value, $name)) {
                throw new LogicException("The entity does not have a '{$name}' property.");
            }
            if ($original->get($name) !== $value->get($name)) {
                $this->context
                    ->addViolation($constraint->message, [
                    '@name' => $name,
                ]);
            }
        }
    }

}