/**
  * {@inheritdoc}
  */
 public function getAllFields()
 {
     $map = $this->entityManager->getFieldMap();
     // Build a list of comment fields only.
     $comment_fields = array();
     foreach ($map as $entity_type => $data) {
         foreach ($data as $field_name => $field_info) {
             if ($field_info['type'] == 'comment') {
                 $comment_fields[$entity_type][$field_name] = $field_info;
             }
         }
     }
     return $comment_fields;
 }
 /**
  * {@inheritdoc}
  */
 public function getFieldMap()
 {
     return $this->entityManager->getFieldMap();
 }