@Override
  public int hashCode() {
    int result = myUpNodeIndex != null ? myUpNodeIndex.hashCode() : 0;
    result = 31 * result + (myDownNodeIndex != null ? myDownNodeIndex.hashCode() : 0);
    result = 31 * result + (myTargetId != null ? myTargetId.hashCode() : 0);
    result = 31 * result + myType.hashCode();
    return result;
  }
@Override
  public int hashCode()