class MenuLinkParent

class MenuLinkParent extends ProcessPluginBase implements ContainerFactoryPluginInterface {
    
    /**
     * @var \Drupal\Core\Menu\MenuLinkManagerInterface
     */
    protected $menuLinkManager;
    
    /**
     * The Migration process plugin.
     *
     * @var \Drupal\migrate\Plugin\MigrateProcessInterface
     *
     * @deprecated in drupal:8.8.x and is removed from drupal:9.0.0. Use
     *   the migrate.lookup service instead.
     *
     * @see https://www.drupal.org/node/3047268
     */
    protected $migrationPlugin;
    
    /**
     * The currently running migration.
     *
     * @var \Drupal\migrate\Plugin\MigrationInterface
     */
    protected $migration;
    
    /**
     * The migrate lookup service.
     *
     * @var \Drupal\migrate\MigrateLookupInterface
     */
    protected $migrateLookup;
    
    /**
     * @var \Drupal\Core\Entity\EntityStorageInterface
     */
    protected $menuLinkStorage;
    
    /**
     * Constructs a MenuLinkParent object.
     *
     * @param array $configuration
     *   A configuration array containing information about the plugin instance.
     * @param string $plugin_id
     *   The plugin_id for the plugin instance.
     * @param mixed $plugin_definition
     *   The plugin implementation definition.
     * @param \Drupal\migrate\MigrateLookupInterface $migrate_lookup
     *   The migrate lookup service.
     * @param \Drupal\Core\Menu\MenuLinkManagerInterface $menu_link_manager
     *   The menu link manager.
     * @param \Drupal\Core\Entity\EntityStorageInterface $menu_link_storage
     *   The menu link storage object.
     * @param \Drupal\migrate\Plugin\MigrationInterface $migration
     *   The currently running migration.
     */
    // @codingStandardsIgnoreLine
    public function __construct(array $configuration, $plugin_id, $plugin_definition, $migrate_lookup, MenuLinkManagerInterface $menu_link_manager, EntityStorageInterface $menu_link_storage, MigrationInterface $migration = NULL) {
        parent::__construct($configuration, $plugin_id, $plugin_definition);
        if ($migrate_lookup instanceof MigrateProcessInterface) {
            @trigger_error('Passing a migration process plugin as the fourth argument to ' . __METHOD__ . ' is deprecated in drupal:8.8.0 and will throw an error in drupal:9.0.0. Pass the migrate.lookup service instead. See https://www.drupal.org/node/3047268', E_USER_DEPRECATED);
            $this->migrationPlugin = $migrate_lookup;
            $migrate_lookup = \Drupal::service('migrate.lookup');
        }
        elseif (!$migrate_lookup instanceof MigrateLookupInterface) {
            throw new \InvalidArgumentException("The fourth argument to " . __METHOD__ . " must be an instance of MigrateLookupInterface.");
        }
        elseif (!$migration instanceof MigrationInterface) {
            throw new \InvalidArgumentException("The seventh argument to " . __METHOD__ . " must be an instance of MigrationInterface.");
        }
        $this->migration = $migration;
        $this->migrateLookup = $migrate_lookup;
        $this->menuLinkManager = $menu_link_manager;
        $this->menuLinkStorage = $menu_link_storage;
    }
    
    /**
     * {@inheritdoc}
     */
    public static function create(ContainerInterface $container, array $configuration, $plugin_id, $plugin_definition, MigrationInterface $migration = NULL) {
        $migration_configuration['migration'][] = $migration->id();
        return new static($configuration, $plugin_id, $plugin_definition, $container->get('migrate.lookup'), $container->get('plugin.manager.menu.link'), $container->get('entity_type.manager')
            ->getStorage('menu_link_content'), $migration);
    }
    
    /**
     * {@inheritdoc}
     *
     * Find the parent link GUID.
     */
    public function transform($value, MigrateExecutableInterface $migrate_executable, Row $row, $destination_property) {
        $parent_id = array_shift($value);
        if (!$parent_id) {
            // Top level item.
            return '';
        }
        // This BC layer is included because if the plugin constructor was called
        // in the legacy way with a migration_lookup process plugin, it may have
        // been preconfigured with a different migration to look up against. While
        // this is unlikely, for maximum BC we will continue to use the plugin to do
        // the lookup if it is provided, and support for this will be removed in
        // Drupal 9.
        if ($this->migrationPlugin) {
            try {
                $already_migrated_id = $this->migrationPlugin
                    ->transform($parent_id, $migrate_executable, $row, $destination_property);
            } catch (MigrateSkipRowException $e) {
            }
        }
        else {
            $lookup_result = $this->migrateLookup
                ->lookup($this->migration
                ->id(), [
                $parent_id,
            ]);
            if ($lookup_result) {
                $already_migrated_id = $lookup_result[0]['id'];
            }
        }
        if (!empty($already_migrated_id) && ($link = $this->menuLinkStorage
            ->load($already_migrated_id))) {
            return $link->getPluginId();
        }
        if (isset($value[1])) {
            list($menu_name, $parent_link_path) = $value;
            $links = [];
            if (UrlHelper::isExternal($parent_link_path)) {
                $links = $this->menuLinkStorage
                    ->loadByProperties([
                    'link__uri' => $parent_link_path,
                ]);
            }
            else {
                $url = Url::fromUserInput("/{$parent_link_path}");
                if ($url->isRouted()) {
                    $links = $this->menuLinkManager
                        ->loadLinksByRoute($url->getRouteName(), $url->getRouteParameters(), $menu_name);
                }
            }
            if (count($links) == 1) {
                
                /** @var \Drupal\Core\Menu\MenuLinkInterface $link */
                $link = reset($links);
                return $link->getPluginId();
            }
        }
        throw new MigrateSkipRowException(sprintf("No parent link found for plid '%d' in menu '%s'.", $parent_id, $value[0]));
    }

}