/**
  * {@inheritdoc}
  */
 public function getReferenceableEntities($match = NULL, $match_operator = 'CONTAINS', $limit = 0)
 {
     if ($match || $limit) {
         return parent::getReferenceableEntities($match, $match_operator, $limit);
     }
     $options = array();
     $bundles = entity_get_bundles('taxonomy_term');
     $bundle_names = !empty($this->instance['settings']['handler_settings']['target_bundles']) ? $this->instance['settings']['handler_settings']['target_bundles'] : array_keys($bundles);
     foreach ($bundle_names as $bundle) {
         if ($vocabulary = entity_load('taxonomy_vocabulary', $bundle)) {
             if ($terms = taxonomy_get_tree($vocabulary->id(), 0, NULL, TRUE)) {
                 foreach ($terms as $term) {
                     $options[$vocabulary->id()][$term->id()] = str_repeat('-', $term->depth) . String::checkPlain($term->getName());
                 }
             }
         }
     }
     return $options;
 }