class FieldItemDeriver

class FieldItemDeriver implements ContainerDeriverInterface {
    
    /**
     * List of derivative definitions.
     *
     * @var array
     */
    protected $derivatives = [];
    
    /**
     * The base plugin ID this derivative is for.
     *
     * @var string
     */
    protected $basePluginId;
    
    /**
     * The field type plugin manager.
     *
     * @var \Drupal\Core\Field\FieldTypePluginManagerInterface
     */
    protected $fieldTypePluginManager;
    
    /**
     * Constructs a FieldItemDeriver object.
     *
     * @param string $base_plugin_id
     *   The base plugin ID.
     * @param \Drupal\Core\Field\FieldTypePluginManagerInterface $field_type_plugin_manager
     *   The field type plugin manager.
     */
    public function __construct($base_plugin_id, FieldTypePluginManagerInterface $field_type_plugin_manager) {
        $this->basePluginId = $base_plugin_id;
        $this->fieldTypePluginManager = $field_type_plugin_manager;
    }
    
    /**
     * {@inheritdoc}
     */
    public static function create(ContainerInterface $container, $base_plugin_id) {
        return new static($base_plugin_id, $container->get('plugin.manager.field.field_type'));
    }
    
    /**
     * {@inheritdoc}
     */
    public function getDerivativeDefinition($derivative_id, $base_plugin_definition) {
        if (!isset($this->derivatives)) {
            $this->getDerivativeDefinitions($base_plugin_definition);
        }
        if (isset($this->derivatives[$derivative_id])) {
            return $this->derivatives[$derivative_id];
        }
    }
    
    /**
     * {@inheritdoc}
     */
    public function getDerivativeDefinitions($base_plugin_definition) {
        foreach ($this->fieldTypePluginManager
            ->getDefinitions() as $plugin_id => $definition) {
            $definition['definition_class'] = '\\Drupal\\Core\\Field\\TypedData\\FieldItemDataDefinition';
            $definition['list_definition_class'] = '\\Drupal\\Core\\Field\\BaseFieldDefinition';
            $definition['unwrap_for_canonical_representation'] = FALSE;
            $this->derivatives[$plugin_id] = $definition;
        }
        return $this->derivatives;
    }

}