> On Jan 16, 2017, at 12:08 PM, Charles Srstka <cocoa...@charlessoft.com> wrote: > >> On Jan 14, 2017, at 4:41 AM, Daryle Walker <dary...@mac.com >> <mailto:dary...@mac.com>> wrote: >> >> 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? > > The thing with file reference URLs degrading to file path URLs is in the > Swift is actually not a bug, it’s deliberate > (https://bugs.swift.org/browse/SR-2728 > <https://bugs.swift.org/browse/SR-2728>). The Swift team decided that file > reference URLs are not appropriate for the Swift URL value type. However, if > you’re using Objective-C, file reference URLs will still work fine, and you > can always make an Objective-C wrapper that stores a file reference URL and > use that from Swift.
I looked at some code that gives a workaround for the file-reference URL problem. It grabs the reference ID as a 128-bit value, dumps it into 2 64-bit values, then sprinkles those onto a URL string template. Since UUIDs are 128-bit values, I could just copy a reference ID directly into a UUID. However it means existing files would have a different style, possibly overlapping, than new files (which would take a random UUID). Maybe it’ll be better to always use a random UUID, the implementers do in practice. — 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
