Re: How to handle prefs with OO

[Charles Yeomans <yeomans at desuetude dot com>]

On Mar 31, 2005, at 1:20 PM, Beatrix Willius wrote:

> Am 31.03.2005 um 16:56 schrieb Thomas Reed <tareedlists at mac dot com>:
>
> > On Mar 31, 2005, at 6:00 AM, Beatrix Willius wrote:
> >
> > > How can I implement this better:
> > I'm partial to Apple's solution to this problem in the Core Foundation
> > on Mac OS X.
> Yes, I am aware of the Core Foundation stuff and use this already.
>
> > If you're doing cross-platform work, though, you can mimic this
> > behavior with a class that reads from a file into a dictionary pretty
> > easily.  Somebody (Kevin Ballard, maybe?) has a class for turning XML
> > into a dictionary and vice versa, though I forget what it's called and
> > have never used it.
> This looks like the way to be cross plattform.
>
> > Beyond that, I wouldn't get complicated with it.  You mentioned
> > factories and whatnot -- too messy.  Not needed.  Remember, whatever 
> > is
> > accessing a particular preference should know what to do with it 
> > better
> > than your abstracted preferences class!
> I have lots of code like:
>
> if MailClient = "AppleMail" then
> 'do something
> elseif MailClient = "Entourage" then
> 'do something else
> 'more mail clients, even more to be added
> end if
>
> I really want to get rid of this. To add a new MailClient I need to 
> change code in about 10 places. So I would like to know why is the 
> factory approach is too complicated.
It may not be for your problem.  It looks to me like you need to 
introduce an object to represent a MailClient.  I had an article in RBD 
some time ago on writing a preferences class that might be more along 
the lines of what you want.
--------------
Charles Yeomans

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