ContentEntityStorageBase::doSave

protected ContentEntityStorageBase::doSave($id, EntityInterface $entity)

protected function doSave($id, EntityInterface $entity) {
  /** @var \Drupal\Core\Entity\ContentEntityInterface $entity */

  if ($entity->isNew()) {
    // Ensure the entity is still seen as new after assigning it an id, while
    // storing its data.
    $entity->enforceIsNew();
    if ($this->entityType->isRevisionable()) {
      $entity->setNewRevision();
    }
    $return = SAVED_NEW;
  }
  else {
    // @todo Consider returning a different value when saving a non-default
    //   entity revision. See https://www.drupal.org/node/2509360.
    $return = $entity->isDefaultRevision() ? SAVED_UPDATED : FALSE;
  }

  $this->populateAffectedRevisionTranslations($entity);
  $this->doSaveFieldItems($entity);

  return $return;
}