- Validation.begin().isGreater("New Image Creation Time", creationTime, 0).isEither("Old Image Creation Time", this.creationTime, 0L, creationTime).check();
+ checkArgument(creationTime > 0, "creationTime must be > 0");
+ checkState((this.creationTime == 0) || (this.creationTime == creationTime), "creationTime must not already be set");