public boolean isParentOf(HierarchicalRecord record) {
   if (record != null) {
     for (HierarchicalRecord parent : record.getParentRecords()) {
       if (this == parent) return true;
       if (isParentOf(parent)) return true;
     }
   }
   return false;
 }
 @Override
 public void mergeWith(Record record, Map<Record, Object> recordsToRefresh) {
   super.mergeWith(record, recordsToRefresh);
   HierarchicalRecord hierarchicalRecord = (HierarchicalRecord) record;
   // parent ids
   for (HierarchicalRecord parentRecord : hierarchicalRecord.getParentRecords()) {
     if (!isParentOf(parentRecord) && !parentRecord.isRoot())
       getHierarchicalIndex().addRelationship(parentRecord, this);
   }
   // child ids
   for (HierarchicalRecord childRecord : hierarchicalRecord.getChildRecords()) {
     if (!isChildOf(childRecord)) getHierarchicalIndex().addRelationship(this, childRecord);
   }
 }