class ComponentEntityDisplayBase

abstract class ComponentEntityDisplayBase extends DestinationBase implements ContainerFactoryPluginInterface {
    const MODE_NAME = '';
    
    /**
     * The entity display repository.
     *
     * @var \Drupal\Core\Entity\EntityDisplayRepositoryInterface
     */
    protected $entityDisplayRepository;
    
    /**
     * PerComponentEntityDisplay constructor.
     *
     * @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\Plugin\MigrationInterface $migration
     *   The migration.
     * @param \Drupal\Core\Entity\EntityDisplayRepositoryInterface $entity_display_repository
     *   The entity display repository service.
     */
    public function __construct(array $configuration, $plugin_id, $plugin_definition, MigrationInterface $migration, EntityDisplayRepositoryInterface $entity_display_repository) {
        parent::__construct($configuration, $plugin_id, $plugin_definition, $migration);
        $this->entityDisplayRepository = $entity_display_repository;
    }
    
    /**
     * {@inheritdoc}
     */
    public static function create(ContainerInterface $container, array $configuration, $plugin_id, $plugin_definition, MigrationInterface $migration = NULL) {
        return new static($configuration, $plugin_id, $plugin_definition, $migration, $container->get('entity_display.repository'));
    }
    
    /**
     * {@inheritdoc}
     */
    public function import(Row $row, array $old_destination_id_values = []) {
        $values = [];
        // array_intersect_key() won't work because the order is important because
        // this is also the return value.
        foreach (array_keys($this->getIds()) as $id) {
            $values[$id] = $row->getDestinationProperty($id);
        }
        $entity = $this->getEntity($values['entity_type'], $values['bundle'], $values[static::MODE_NAME]);
        if (!$row->getDestinationProperty('hidden')) {
            $entity->setComponent($values['field_name'], $row->getDestinationProperty('options') ?: []);
        }
        else {
            $entity->removeComponent($values['field_name']);
        }
        $entity->save();
        return array_values($values);
    }
    
    /**
     * {@inheritdoc}
     */
    public function getIds() {
        $ids['entity_type']['type'] = 'string';
        $ids['bundle']['type'] = 'string';
        $ids[static::MODE_NAME]['type'] = 'string';
        $ids['field_name']['type'] = 'string';
        return $ids;
    }
    
    /**
     * {@inheritdoc}
     */
    public function fields() {
        // This is intentionally left empty.
    }
    
    /**
     * Gets the entity.
     *
     * @param string $entity_type
     *   The entity type to retrieve.
     * @param string $bundle
     *   The entity bundle.
     * @param string $mode
     *   The display mode.
     *
     * @return \Drupal\Core\Entity\Display\EntityDisplayInterface
     *   The entity display object.
     */
    protected abstract function getEntity($entity_type, $bundle, $mode);

}