class LayoutBuilderSampleEntityGenerator

class LayoutBuilderSampleEntityGenerator implements SampleEntityGeneratorInterface {
  
  /**
   * The shared tempstore factory.
   *
   * @var \Drupal\Core\TempStore\SharedTempStoreFactory
   */
  protected $tempStoreFactory;
  
  /**
   * The entity type manager.
   *
   * @var \Drupal\Core\Entity\EntityTypeManagerInterface
   */
  protected $entityTypeManager;
  
  /**
   * LayoutBuilderSampleEntityGenerator constructor.
   *
   * @param \Drupal\Core\TempStore\SharedTempStoreFactory $temp_store_factory
   *   The tempstore factory.
   * @param \Drupal\Core\Entity\EntityTypeManagerInterface $entity_type_manager
   *   The entity type manager.
   */
  public function __construct(SharedTempStoreFactory $temp_store_factory, EntityTypeManagerInterface $entity_type_manager) {
    $this->tempStoreFactory = $temp_store_factory;
    $this->entityTypeManager = $entity_type_manager;
  }
  
  /**
   * {@inheritdoc}
   */
  public function get($entity_type_id, $bundle_id) {
    $tempstore = $this->tempStoreFactory
      ->get('layout_builder.sample_entity');
    if ($entity = $tempstore->get("{$entity_type_id}.{$bundle_id}")) {
      return $entity;
    }
    $entity_storage = $this->entityTypeManager
      ->getStorage($entity_type_id);
    if (!$entity_storage instanceof ContentEntityStorageInterface) {
      throw new \InvalidArgumentException(sprintf('The "%s" entity storage is not supported', $entity_type_id));
    }
    $entity = $entity_storage->createWithSampleValues($bundle_id);
    // Mark the sample entity as being a preview.
    $entity->in_preview = TRUE;
    $tempstore->set("{$entity_type_id}.{$bundle_id}", $entity);
    return $entity;
  }
  
  /**
   * {@inheritdoc}
   */
  public function delete($entity_type_id, $bundle_id) {
    $tempstore = $this->tempStoreFactory
      ->get('layout_builder.sample_entity');
    $tempstore->delete("{$entity_type_id}.{$bundle_id}");
    return $this;
  }

}