class ConfigMapperManager

class ConfigMapperManager extends DefaultPluginManager implements ConfigMapperManagerInterface {
    
    /**
     * The typed config manager.
     *
     * @var \Drupal\Core\Config\TypedConfigManagerInterface
     */
    protected $typedConfigManager;
    
    /**
     * The theme handler.
     *
     * @var \Drupal\Core\Extension\ThemeHandlerInterface
     */
    protected $themeHandler;
    
    /**
     * {@inheritdoc}
     */
    protected $defaults = [
        'title' => '',
        'names' => [],
        'weight' => 20,
        'class' => '\\Drupal\\config_translation\\ConfigNamesMapper',
    ];
    
    /**
     * Constructs a ConfigMapperManager.
     *
     * @param \Drupal\Core\Cache\CacheBackendInterface $cache_backend
     *   The cache backend.
     * @param \Drupal\Core\Language\LanguageManagerInterface $language_manager
     *   The language manager.
     * @param \Drupal\Core\Extension\ModuleHandlerInterface $module_handler
     *   The module handler.
     * @param \Drupal\Core\Config\TypedConfigManagerInterface $typed_config_manager
     *   The typed config manager.
     * @param \Drupal\Core\Extension\ThemeHandlerInterface $theme_handler
     *   The theme handler.
     */
    public function __construct(CacheBackendInterface $cache_backend, LanguageManagerInterface $language_manager, ModuleHandlerInterface $module_handler, TypedConfigManagerInterface $typed_config_manager, ThemeHandlerInterface $theme_handler) {
        $this->typedConfigManager = $typed_config_manager;
        $this->factory = new ContainerFactory($this, '\\Drupal\\config_translation\\ConfigMapperInterface');
        // Let others alter definitions with hook_config_translation_info_alter().
        $this->moduleHandler = $module_handler;
        $this->themeHandler = $theme_handler;
        $this->alterInfo('config_translation_info');
        // Config translation only uses an info hook discovery, cache by language.
        $cache_key = 'config_translation_info_plugins' . ':' . $language_manager->getCurrentLanguage()
            ->getId();
        $this->setCacheBackend($cache_backend, $cache_key, [
            'config_translation_info_plugins',
        ]);
    }
    
    /**
     * {@inheritdoc}
     */
    protected function getDiscovery() {
        if (!isset($this->discovery)) {
            // Look at all themes and modules.
            // @todo If the list of installed modules and themes is changed, new
            //   definitions are not picked up immediately and obsolete definitions
            //   are not removed, because the list of search directories is only
            //   compiled once in this constructor. The current code only works due to
            //   coincidence: The request that installs (for instance, a new theme)
            //   does not instantiate this plugin manager at the beginning of the
            //   request; when routes are being rebuilt at the end of the request,
            //   this service only happens to get instantiated with the updated list
            //   of installed themes.
            $directories = [];
            foreach ($this->moduleHandler
                ->getModuleList() as $name => $module) {
                $directories[$name] = $module->getPath();
            }
            foreach ($this->themeHandler
                ->listInfo() as $theme) {
                $directories[$theme->getName()] = $theme->getPath();
            }
            // Check for files named MODULE.config_translation.yml and
            // THEME.config_translation.yml in module/theme roots.
            $this->discovery = new YamlDiscovery('config_translation', $directories);
            $this->discovery = new InfoHookDecorator($this->discovery, 'config_translation_info');
            $this->discovery = new ContainerDerivativeDiscoveryDecorator($this->discovery);
        }
        return $this->discovery;
    }
    
    /**
     * {@inheritdoc}
     */
    public function getMappers(RouteCollection $collection = NULL) {
        $mappers = [];
        foreach ($this->getDefinitions() as $id => $definition) {
            $mappers[$id] = $this->createInstance($id);
            if ($collection) {
                $mappers[$id]->setRouteCollection($collection);
            }
        }
        return $mappers;
    }
    
    /**
     * {@inheritdoc}
     */
    public function processDefinition(&$definition, $plugin_id) {
        parent::processDefinition($definition, $plugin_id);
        if (!isset($definition['base_route_name'])) {
            throw new InvalidPluginDefinitionException($plugin_id, "The plugin definition of the mapper '{$plugin_id}' does not contain a base_route_name.");
        }
    }
    
    /**
     * {@inheritdoc}
     */
    public function buildDataDefinition(array $definition, $value = NULL, $name = NULL, $parent = NULL) {
        return $this->typedConfigManager
            ->buildDataDefinition($definition, $value, $name, $parent);
    }
    
    /**
     * {@inheritdoc}
     */
    protected function findDefinitions() {
        $definitions = $this->getDiscovery()
            ->getDefinitions();
        foreach ($definitions as $plugin_id => &$definition) {
            $this->processDefinition($definition, $plugin_id);
        }
        if ($this->alterHook) {
            $this->moduleHandler
                ->alter($this->alterHook, $definitions);
        }
        // If this plugin was provided by a module that does not exist, remove the
        // plugin definition.
        foreach ($definitions as $plugin_id => $plugin_definition) {
            if (isset($plugin_definition['provider']) && !in_array($plugin_definition['provider'], [
                'core',
                'component',
            ]) && (!$this->moduleHandler
                ->moduleExists($plugin_definition['provider']) && !in_array($plugin_definition['provider'], array_keys($this->themeHandler
                ->listInfo())))) {
                unset($definitions[$plugin_id]);
            }
        }
        return $definitions;
    }
    
    /**
     * {@inheritdoc}
     */
    public function hasTranslatable($name) {
        return $this->findTranslatable($this->typedConfigManager
            ->get($name));
    }
    
    /**
     * Returns TRUE if at least one translatable element is found.
     *
     * @param \Drupal\Core\TypedData\TypedDataInterface $element
     *   Configuration schema element.
     *
     * @return bool
     *   A boolean indicating if there is at least one translatable element.
     */
    protected function findTranslatable(TypedDataInterface $element) {
        // In case this is a sequence or a mapping check whether any child element
        // is translatable.
        if ($element instanceof TraversableTypedDataInterface) {
            foreach ($element as $child_element) {
                if ($this->findTranslatable($child_element)) {
                    return TRUE;
                }
            }
            // If none of the child elements are translatable, return FALSE.
            return FALSE;
        }
        else {
            $definition = $element->getDataDefinition();
            return isset($definition['translatable']) && $definition['translatable'];
        }
    }

}