Re: Document Based Application
Re: Document Based Application
- Subject: Re: Document Based Application
- From: koko <email@hidden>
- Date: Sun, 08 Jul 2012 16:36:58 -0600
Quite nice, thanks GG.
-koko
On Jul 8, 2012, at 3:01 PM, Greg Guerin wrote:
> koko wrote:
>
>> I have 29 file types and wanted to get away from the if or switch to open them and let NSDocument pick the right class for me.
>>
>> As I understand it, an Item in the Document types array of the plist contains and entry for an NSDocument class.
>>
>> And yes, each type has a unique extension (possibly multiple). I.e. type phobia has extensions pho, pho12, pho15 all mapped to NSDocument subclass MYPhobia.
>
>
> Use an NSDictionary. The key is the file extension. The value is the subclass name, or the actual Class object. Cost is one dictionary lookup. Plus it's extensible, and can be revised without altering code.
>
> You can also add a level of indirection. The key is still file extension, but the value is a number (int). Use the number as an index into an NSArray of classname strings, or the actual Class objects.
>
> The dictionary and/or array can be stored as plists in your app's Resources sub-dir.
>
> -- GG
>
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