class TermStorageController

class TermStorageController extends DatabaseStorageController {

  /**
   * Overrides Drupal\Core\Entity\DatabaseStorageController::create().
   *
   * @param array $values
   *   An array of values to set, keyed by property name. A value for the
   *   vocabulary ID ('vid') is required.
   */
  public function create(array $values) {
    $entity = parent::create($values);

    // Ensure the vocabulary machine name is initialized as it is used as the
    // bundle key. Only attempt to do this if a vocabulary ID is available,
    // which might not be the case when creating partial entity structures.
    // @todo Move to Term::bundle() once field API has been converted
    //   to make use of it.
    if (!isset($entity->vocabulary_machine_name) && isset($entity->vid)) {
      $vocabulary = taxonomy_vocabulary_load($entity->vid);
      $entity->vocabulary_machine_name = $vocabulary->machine_name;
    }

    // Save new terms with no parents by default.
    if (!isset($entity->parent)) {
      $entity->parent = array(
        0,
      );
    }
    return $entity;
  }

  /**
   * Overrides Drupal\Core\Entity\DatabaseStorageController::buildQuery().
   */
  protected function buildQuery($ids, $revision_id = FALSE) {
    $query = parent::buildQuery($ids, $revision_id);
    $query
      ->addTag('translatable');
    $query
      ->addTag('term_access');

    // Add the machine name field from the {taxonomy_vocabulary} table.
    $query
      ->innerJoin('taxonomy_vocabulary', 'v', 'base.vid = v.vid');
    $query
      ->addField('v', 'machine_name', 'vocabulary_machine_name');
    return $query;
  }

  /**
   * Overrides Drupal\Core\Entity\DatabaseStorageController::buildPropertyQuery().
   */
  protected function buildPropertyQuery(QueryInterface $entity_query, array $values) {
    if (isset($values['name'])) {
      $entity_query
        ->condition('name', $values['name'], 'LIKE');
      unset($values['name']);
    }
    parent::buildPropertyQuery($entity_query, $values);
  }

  /**
   * Overrides Drupal\Core\Entity\DatabaseStorageController::postDelete().
   */
  protected function postDelete($entities) {

    // See if any of the term's children are about to be become orphans.
    $orphans = array();
    foreach (array_keys($entities) as $tid) {
      if ($children = taxonomy_term_load_children($tid)) {
        foreach ($children as $child) {

          // If the term has multiple parents, we don't delete it.
          $parents = taxonomy_term_load_parents($child->tid);

          // Because the parent has already been deleted, the parent count might
          // be 0.
          if (count($parents) <= 1) {
            $orphans[] = $child->tid;
          }
        }
      }
    }

    // Delete term hierarchy information after looking up orphans but before
    // deleting them so that their children/parent information is consistent.
    db_delete('taxonomy_term_hierarchy')
      ->condition('tid', array_keys($entities))
      ->execute();
    if (!empty($orphans)) {
      taxonomy_term_delete_multiple($orphans);
    }
  }

  /**
   * Overrides Drupal\Core\Entity\DatabaseStorageController::postSave().
   */
  protected function postSave(EntityInterface $entity, $update) {
    if (isset($entity->parent)) {
      db_delete('taxonomy_term_hierarchy')
        ->condition('tid', $entity->tid)
        ->execute();
      $query = db_insert('taxonomy_term_hierarchy')
        ->fields(array(
        'tid',
        'parent',
      ));
      foreach ($entity->parent as $parent) {
        $query
          ->values(array(
          'tid' => $entity->tid,
          'parent' => $parent,
        ));
      }
      $query
        ->execute();
    }
  }

  /**
   * Overrides Drupal\Core\Entity\DatabaseStorageController::resetCache().
   */
  public function resetCache(array $ids = NULL) {
    drupal_static_reset('taxonomy_term_count_nodes');
    drupal_static_reset('taxonomy_get_tree');
    drupal_static_reset('taxonomy_get_tree:parents');
    drupal_static_reset('taxonomy_get_tree:terms');
    drupal_static_reset('taxonomy_term_load_parents');
    drupal_static_reset('taxonomy_term_load_parents_all');
    drupal_static_reset('taxonomy_term_load_children');
    parent::resetCache($ids);
  }

}