class FileStorageController

file_autoload_info in modules/file/file.module

Implements hook_autoload_info().

file_entity_info in modules/file/file.module

Implements hook_entity_info().

class FileStorageController extends EntityDatabaseStorageController {
  /**
   * Overrides EntityDatabaseStorageController::presave().
   *
   * @param File $entity
   *   The file entity about to be saved.
   */
  protected function preSave(EntityInterface $entity) {
    $entity->timestamp = REQUEST_TIME;
    $entity->filesize = filesize($entity->uri);
    if (!isset($entity->langcode)) {
      // Default the file's language code to none, because files are language
      // neutral more often than language dependent.
      $entity->langcode = LANGUAGE_NONE;
    }

    // The file type is used as a bundle key, and therefore, must not be NULL.
    // It defaults to FILE_TYPE_NONE when loaded via file_load(), but in case
    // file_save() is called on a new file object, default it here too.
    if (!isset($entity->type)) {
      $entity->type = FILE_TYPE_NONE;
    }

    // If the file isn't already assigned a real type, determine what type should
    // be assigned to it.
    if ($entity->type === FILE_TYPE_NONE) {
      $type = file_get_type($entity);
      if (isset($type)) {
        $entity->type = $type;
      }
    }
  }

  /**
   * Overrides EntityDatabaseStorageController::preDelete().
   *
   * @param File[] $entities
   *   The file entities about to be deleted.
   */
  public function preDelete($entities) {
    foreach ($entities as $entity) {
      // Delete the actual file. Failures due to invalid files and files that
      // were already deleted are logged to watchdog but ignored, the
      // corresponding file entity will be deleted.
      file_unmanaged_delete($entity->uri);
    }
    // Delete corresponding file usage entries.
    db_delete('file_usage')
      ->condition('fid', array_keys($entities), 'IN')
      ->execute();
  }

}