Need update routine

[cad97]

Between two versions of my mod I've changed how data on an item is stored. I can easy convert to the new version, but where is the best place to call that update routine?

 

I want a way to call updateToNewVersion(ItemStack) (for example) on all ItemStacks of one custom Item only one time if they need updating. (They need updating if they have non-zero metadata and no NBT tags.)

[cad97]

Thanks, that's exactly what I needed.

 

(And duh, I've done that before. Why didn't I think of that.)