@Override
  public int hashCode() {
    int result = myFile.hashCode();
    result = 31 * result + myPropertyName.hashCode();
    result = 31 * result + (myOldValue != null ? myOldValue.hashCode() : 0);
    result = 31 * result + (myNewValue != null ? myNewValue.hashCode() : 0);
    return result;
  }
@Override
  public int hashCode()