> On Jan 11, 2017, at 3:58 PM, Keary Suska <cocoa-...@esoteritech.com> wrote: > > >> On Jan 11, 2017, at 11:16 AM, Jens Alfke <j...@mooseyard.com> wrote: >> >> >>> On Jan 10, 2017, at 2:00 PM, Jean-Daniel <mail...@xenonium.com> wrote: >>> >>> UUID means Universally unique identifier and it must be unique: >>> https://en.wikipedia.org/wiki/UUID >>> <https://en.wikipedia.org/wiki/UUID><https://en.wikipedia.org/wiki/UUID >>> <https://en.wikipedia.org/wiki/UUID>> >>> To generate an UUID, use a standard system function (CFUUID, NSUUID, >>> libuuid, …) >> >> This is not what I believe Daryle was asking, and it’s sent everyone off on >> a tangent about what UUIDs are. >> >> My interpretation of the original question: Is an NSIncrementalStore’s UUID >> scoped to the specific database, or is it scoped to that _implementation_ of >> the store? That is, is the UUID generated at runtime or at compile time? >> >> I don’t know the answer; just hoping to get the discussion back on track :) > > The docs say: > "A unique identifier for the store at the given URL. It must be > uniquely and reproducibly derivable, such that multiple instances of your > store return the same UUID” > > My reading is that the store UUID would be unique to a specific database > since it is only unique to the URL location of the store. I thin the docs use > “instance” in a strictly OOP sense.
Yes, this is what my question is about. Could I grab a UUID from a get-a-random-UUID site, hard code it as a type-level property in Swift, and use it for every instantiation (even for different files)? If this isn’t acceptable, I’m seemingly stuck since the data format doesn’t have a UUID field within it and I can’t base a UUID off of a hash of the file since it would change after each edit. Could I base the UUID off a hash of the URL? Maybe, but it wouldn’t survive file moves. There are file references in macOS, which would be more stable, but I read that there’s a bug in the URL class where it would degrade file-reference URLs to standard-file URLs, so that’ll be problematic. Another solution would to create bookmark data from a file URL and take a hash of that. But are multiple bookmark data blocks of the same file URL consistent enough for this idea to work? — Daryle Walker Mac, Internet, and Video Game Junkie darylew AT mac DOT com _______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
