gistfile1.aw

  public function getExporter() {
    if (empty($this->exporter)) {
      if (class_exists($this->info['exporter class'])) {
        $reflection = new \ReflectionClass($this->info['exporter class']);
        if ($reflection->implementsInterface('Drupal\ctools\ExporterInterface')) {
          $this->exporter = $reflection->newInstance();
        }
        else {
          return FALSE;
        }
      }
      else {
        return FALSE;
      }
    }

    return $this->exporter;
  }