--- Peter Reilly <[EMAIL PROTECTED]> wrote:
> On 8/22/07, Matt Benson <[EMAIL PROTECTED]>
> wrote:
> >
> > --- Peter Reilly <[EMAIL PROTECTED]>
> wrote:
> >
> > > On 8/22/07, Matt Benson <[EMAIL PROTECTED]>
> > > wrote:
> >
> > [SNIP]
> > > > though I'd still like an opinion on the proxy
> > > > mechanism I suggested for delegate
> recursion...
> > > :)
> > >
> > > I did not reply because I did not understand the
> > > proposal :-)
> > >
> > [SNIP]
> >
> > Okay--when a PH calls a delegate it passes itself
> down
> > in case the delegate needs to make calls against
> the
> > PH. This would imply a sort of property decorator
> > pattern. Anyway, I think in this case a delegate
> > calling PH.get() might need to be able to discern
> the
> > difference between NullReturn and no-such-property
> > null. The first thing that occurred to me was
> that
> > the PH could pass the delegate not itself, but a
> sort
> > of proxy to itself that would fail to decode
> > NullResult but instead return it to the delegate
> > unharmed so that the delegate could handle the
> > difference between them. Since this would need to
> be
> > passed down over and over again I thought it could
> > live as a member of each PropertyHelper instance.
>
> I think that I sort of follow, however I do not
> think that
> it can be a member of the PH instance since PH needs
> to be ThreadSafe.
>
> My idea was that the nullreturn was a message to PH
> (i.e.
> end the chain) and not to the PH delegates.
>
> Perhaps a new method PH.evalulateProperty(project,
> name) (like
> PH.getProperty(project, name),
> could return a PHResultObject -
> the tostring of which would be the current
> stringy form - ie
> ${xx} (a delegate could change this to a "null"
> and the getObject()
> would return null or the object
> if present. setX(String, File etc) would be
> called with the
> toString() method and setX(Object) would be
> called with the
> getObject() method.
>
> If a delegate can resolve a property, it can
> return a PHResultObject
> if it wants to do something like handing nulls.
>
>
My mind is swimming, and I don't really have the time
to try and make complete sense of all this right now.
:( I would say we could just leave the issue until it
causes a problem, but I'd rather have as many issues
as possible ironed out before 1.8.0 is released or
we'll have further API ugliness. But we've got some
time until then.
-Matt
> Peter
>
>
> >
> > Does that make sense?
> >
> > -Matt
> >
> >
> >
> >
>
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