class FieldTypeCategoryManager

class FieldTypeCategoryManager extends DefaultPluginManager implements FieldTypeCategoryManagerInterface, FallbackPluginManagerInterface {
    
    /**
     * {@inheritdoc}
     */
    protected $defaults = [
        'label' => '',
        'description' => '',
        'weight' => 0,
        'class' => FieldTypeCategory::class,
    ];
    
    /**
     * Constructs a new FieldTypeCategoryManager.
     *
     * @param string $root
     *   The app root.
     * @param \Drupal\Core\Extension\ModuleHandlerInterface $module_handler
     *   The module handler.
     * @param \Drupal\Core\Cache\CacheBackendInterface $cache_backend
     *   The cache backend.
     */
    public function __construct(string $root, ModuleHandlerInterface $module_handler, CacheBackendInterface $cache_backend) {
        $this->moduleHandler = $module_handler;
        $this->alterInfo('field_type_category_info');
        $this->setCacheBackend($cache_backend, 'field_type_category_info_plugins');
    }
    
    /**
     * {@inheritdoc}
     */
    protected function getDiscovery() : YamlDiscovery {
        if (!isset($this->discovery)) {
            $directories = [
                'core' => $this->root . '/core',
            ];
            $directories += $this->moduleHandler
                ->getModuleDirectories();
            $this->discovery = new YamlDiscovery('field_type_categories', $directories);
            $this->discovery
                ->addTranslatableProperty('label')
                ->addTranslatableProperty('description');
        }
        return $this->discovery;
    }
    
    /**
     * {@inheritdoc}
     */
    protected function alterDefinitions(&$definitions) : void {
        parent::alterDefinitions($definitions);
        if (!isset($definitions[FieldTypeCategoryManagerInterface::FALLBACK_CATEGORY])) {
            throw new \LogicException('Missing fallback category.');
        }
    }
    
    /**
     * {@inheritdoc}
     */
    public function getFallbackPluginId($plugin_id, array $configuration = []) : string {
        return FieldTypeCategoryManagerInterface::FALLBACK_CATEGORY;
    }

}