public boolean isLengthAndTimestampDiffProvided() {
    return myOldTimestamp != UNDEFINED_TIMESTAMP_OR_LENGTH || myNewTimestamp != UNDEFINED_TIMESTAMP_OR_LENGTH ||
           myOldLength != UNDEFINED_TIMESTAMP_OR_LENGTH || myNewLength != UNDEFINED_TIMESTAMP_OR_LENGTH;
  }
public boolean isLengthAndTimestampDiffProvided()