- Validation.begin().isNotNull("Album", album).check().isEqual("Album Owner", album.getSone(), this).isNull("Album Parent", album.getParent()).check();
+ checkNotNull(album, "album must not be null");
+ checkArgument(album.getSone().equals(this), "album must belong to this Sone");
+ checkArgument(album.getParent() == null, "album must not have a parent");