interface MetadataGeneratorInterface

interface MetadataGeneratorInterface {
    
    /**
     * Generates in-place editing metadata for an entity.
     *
     * @param \Drupal\Core\Entity\EntityInterface $entity
     *   The entity, in the language in which one of its fields is being edited.
     *
     * @return array
     *   An array containing metadata with the following keys:
     *   - label: the user-visible label for the entity in the given language.
     */
    public function generateEntityMetadata(EntityInterface $entity);
    
    /**
     * Generates in-place editing metadata for an entity field.
     *
     * @param \Drupal\Core\Field\FieldItemListInterface $items
     *   The field values to be in-place edited.
     * @param string $view_mode
     *   The view mode the field should be rerendered in.
     *
     * @return array
     *   An array containing metadata with the following keys:
     *   - label: the user-visible label for the field.
     *   - access: whether the current user may edit the field or not.
     *   - editor: which editor should be used for the field.
     *   - aria: the ARIA label.
     *   - custom: (optional) any additional metadata that the editor provides.
     */
    public function generateFieldMetadata(FieldItemListInterface $items, $view_mode);

}