[interfacekit] Re: BRoster::FindApp()
- From: "Axel Dörfler" <axeld@xxxxxxxxxxxxxxxx>
- To: interfacekit@xxxxxxxxxxxxx
- Date: Tue, 20 Jan 2004 13:41:06 +0100 CET
Ingo Weinhold <bonefish@xxxxxxxxxxxxxxx> wrote:
> On 2004-01-18 at 03:37:29 [+0100], Axel Dörfler wrote:
> > > I also think that FindApp should ignore the preferred app if an
> > > app
> > > of applicable signature doesn't exist. It should fall back to
> > > the
> > > default application for the mime type. (don't change the setting
> > > of
> > > the preferred app attribute though)
> What default application? The preferred application is the default
> application. The only thing we can fall back to is the preferred
> application of the supertype, if you mean that.
Yes, I actually meant it the way you proposed below :)
> Allow me to recapitulate, how FindApp() searches the application for
> a
> given entry (assume that the entry exists adn is not a file with
> executable
> permission):
>
> 1) get the preferred app signature of the node
> a) if found continue with preferred app MIME type
> b) else with the node's MIME type -- sniff the type, if it has
> none
> 2) get the preferred app signature of the given MIME type
> a) if it has one, continue with it
> b) else if the supertype has one, continue with that
> c) else fail
> 3) get the type's app hint
> a) if it has one and the file exists, we're done
> b) else query for the app file and pick the one with the latest
> version
> c) if none exists, fail
>
> Note that 1a) causes the preferred app of the preferred app to be
> found,
> which does no harm, since applications have themselves as preferred
> app.
I always wondered about this - it looks a bit odd and ugly to me.
> The algorithm may be changed like this:
>
> 1) get the preferred app signature of the node
> a) if found, use algorithm 3) to get the app ref and return it
> if successful, otherwise continue
> b) else get the node's MIME type -- sniff the type, if it has none
> 2) get the preferred app signature of the given MIME type
> a) if it has one, use 3) to get the app ref and return it if
> successful, otherwise continue with b)
> b) else if the supertype has one, use 3) and be done or
> c) else fail
> 3) as above
>
> Does that sound OK?
I am all for that, too!
Bye,
Axel.
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