class ClassResolver

class ClassResolver implements ClassResolverInterface {
  use DependencySerializationTrait;
  
  /**
   * Constructs a new ClassResolver object.
   *
   * @param \Symfony\Component\DependencyInjection\ContainerInterface $container
   *   The service container.
   */
  public function __construct(protected ContainerInterface $container) {
  }
  
  /**
   * {@inheritdoc}
   */
  public function getInstanceFromDefinition($definition) {
    if ($this->container
      ->has($definition)) {
      $instance = $this->container
        ->get($definition);
    }
    else {
      if (!class_exists($definition)) {
        throw new \InvalidArgumentException(sprintf('Class "%s" does not exist.', $definition));
      }
      if (is_subclass_of($definition, 'Drupal\\Core\\DependencyInjection\\ContainerInjectionInterface')) {
        $instance = $definition::create($this->container);
      }
      else {
        $instance = new $definition();
      }
    }
    return $instance;
  }

}