Sulu\Bundle\PersistenceBundle\DependencyInjection\Compiler\ResolveTargetEntitiesPass::getClass PHP Method

    private function getClass(ContainerBuilder $container, $key)
    {
        if ($container->hasParameter($key)) {
            return $container->getParameter($key);
        }
        if (class_exists($key)) {
            return $key;
        }
        throw new \InvalidArgumentException(sprintf('The class %s does not exist.', $key));
    }