Re: case-insensitive NSDictionary
Re: case-insensitive NSDictionary
- Subject: Re: case-insensitive NSDictionary
- From: Jean-Daniel Dupas <email@hidden>
- Date: Mon, 16 Mar 2009 16:52:02 +0100
Le 16 mars 09 à 16:37, Bill Bumgarner a écrit :
On Mar 16, 2009, at 7:05 AM, Dave DeLong wrote:
You could swizzle the objectForKey: and setObject:forKey: methods
with your own that just lowercase the passed in string and then
call the actual methods with the new key.
Wile certainly a creative solution, this suggestion is an 11 on the
scale of 1 to 10 of bad ideas. Even if it would work, which it
won't because NSDictionary -- as noted later -- is a class cluster.
The swizzling would change the behavior of all NSDictionary
instances. I'd wager a rather large sum of money that the rest of
the AppKit, Foundation, CoreFoundation, CoreData, and any other
framework that uses NSDictionary instances would have at least one
case where making all strings suddenly case insensitive as keys
would behave rather badly.
Simple rule: Do Not Swizzle in Production Code.
A solution to the OP's problem is to create a subclass of NSObject
that contains an NSString, implements the appropriate NSString like
get/set methods, and implements -hash and -isEqual: based on the -
lowercase string of the contained string. Make sure it implements
the <NSCopying> protocol so that it can be a key in a dictionary.
You could also subclass NSString, if you want, and do -- effectively
-- the same thing.
Subclassing NSString is probably not a so good idea, as this is a
class cluster too and will require far more work than wrapping it.
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