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Re: [morph-developer] SimpleLanguageBeanReflector
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From: Matt B. <gud...@ya...> - 2007-02-22 13:21:28
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Did I/we lose track of something? I can't recall that
there are any outstanding patches from Ben that
haven't been applied to HEAD. And yes, we should
probably do a release sometime in the near future
IMHO... :|
-Matt
--- Matt Sgarlata
<Mat...@wh...> wrote:
> Hi Alan - the patches will either be accepted or
> modified and then
> accepted. I promise we will do this before the next
> Morph release.
>
> So when is the next Morph release? Well, as you can
> tell, they aren't
> very frequent. The main reason is that I do
> software development as a
> full time job, so Morph isn't really a hobby in
> quite the same way as it
> used to be. If Matt B starts to push for a release,
> I will chip in and
> make sure the patches are either accepted or
> accepted and modified
> before the release.
>
> Matt S
>
> Alan Stewart wrote:
> > Hi
> > I'm a user of Dozer and wanted to know if the
> changes Ben Alex suggested
> > will be incorporated into Morph and if so, when?
> > Regards
> > Alan
> >
> > Matt Benson wrote:
> >
> >> --- Matt Sgarlata
> >> <Mat...@wh...> wrote:
> >>
> >>
> >>
> >>> Cool idea! Where are you headed with this?
> >>>
> >>>
> >> If I tell you, I'm deprived of my curtain-pulling
> >> ta-da moment... But since you're asking, I'll
> tell
> >> you:
> >>
> >> Dozer is the other OSS object-conversion
> framework
> >> that anyone knows about that has enough meat to
> be
> >> viable for real work. A lot of people probably
> >> wouldn't switch from Dozer to Morph if they
> perceived
> >> themselves as losing anything in the way of
> >> functionality. Dozer's primary configuration
> >> interface is an XML resource. Morph on the other
> hand
> >> must be configured entirely programmatically or
> >> Spring-wired. What I have been working on these
> past
> >> couple of weeks is a means of mapping properties
> using
> >> a configuration format specific to Morph. Wow,
> you
> >> say sarcastically... But there's more! :) I
> can
> >> already build simple configuration-file driven
> copiers
> >> composed of PropertyNameMapping/MatchingCopiers,
> so my
> >> next step was, in true me-too fashion, to be able
> to
> >> map complex properties (Dozer does this). I
> -believe-
> >> the only thing I needed here was to implement a
> >> reflector capable of interpreting complex
> properties
> >> (done), and set that as the reflector on my
> generated
> >> PropertyNameMappingCopiers, but I haven't done
> this
> >> yet.
> >>
> >> Is that all? Of course not! What's cool about
> simply
> >> duplicating someone else's functionality? Only
> if you
> >> can one-up them in some way do you come out
> ahead.
> >>
> >>
> >>> :) Example: ever since I began working with
> Dozer,
> >>>
> >>>
> >> they provided a unidirectional mapping feature.
> >> However, the one direction was only from "class
> A" to
> >> "class B"--a limitation (the Dozer team
> recognizes it
> >> as such). This was tedious to define in their
> XML
> >> format so they still, as far as I know, haven't
> done
> >> it. XML is clunky anyway. So what I am working
> on is
> >> a custom (ANTLR-implemented) DSL for Morph
> property
> >> mapping.
> >>
> >> Example 1: basic mapping
> >>
> >> net.sf.morph.transform.copiers.dsl.test.A :
> >> net.sf.morph.transform.copiers.dsl.test.B {
> >> *,
> >> stringA : stringB,
> >> intA : intB,
> >> objectA : objectB
> >> }
> >>
> >> The above signifies a bidirectional mapping
> >> association between two classes. The asterisk
> >> signifies that matching property names will be
> copied,
> >> and that the three paired mappings will be made.
> >>
> >> Example 2: mapping some fields leftward only
> (Dozer
> >> can only do rightward)
> >>
> >> net.sf.morph.transform.copiers.dsl.test.A :
> >> net.sf.morph.transform.copiers.dsl.test.B {
> >> *,
> >> stringA<=stringB,
> >> intA<=intB,
> >> objectA<=objectB
> >> }
> >>
> >> As above, the matching properties will be mapped.
> The
> >> explicitly defined properties only go from class
> B to
> >> class A. To specify all mapping to be leftward
> only,
> >> the class association can be defined with <= .
> As you
> >> would expect, => indicates rightward mappings.
> >>
> >> There are other little things but that's the jist
> of
> >> it, anyway. I'm hoping this will ease the
> transition
> >> of hypothetical users from Dozer to Morph. ;)
> >>
> >>
> >>
> >>> One thing I worry about is that we may be
> >>> introducing circular
> >>> dependencies. Languages depend on converters
> which
> >>> in turn depend on
> >>> reflectors. If we make a reflector that is
> >>> dependent on a language I
> >>> wonder if that could get us into trouble.
> >>>
> >>>
> >> I hear you, but composition is such an integral
> part
> >> of Morph's architecture that I just don't see a
> lot of
> >> danger here. As you can see, my intent is to
> make it
> >> even deeper! I want to make a delegatingCopier
> that
> >> depends on propertyCopiers that depend on
> reflectors
> >> that depend on languages that depend on
> reflectors...
> >> I think that's right. :) Ultimately I think
> that
> >> yes, if you misconfigure Morph it will fail
> >> spectacularly. That seems to me more likely than
> for
> >> it to misbehave subtly. Anyway, I am doing my
> >> DSLDefinedCopier in the sandbox, so hopefully
> I'll
> >> have something to check in later this week for
> your
> >> perusal. Incidentally, if you have a better name
> than
> >> DSLDefinedCopier, I'm all ears. :)
> >>
> >> -Matt B
> >>
> >>
> >>> Matt S
> >>>
> >>> Matt Benson wrote:
> >>>
> >>>
> >>>> I've just implemented a reflector over
> >>>>
> >>>>
> >>> SimpleLanguage,
> >>>
> >>>
> >>>> which is of course itself implemented over the
> >>>>
> >>>>
> >>> basic
> >>>
> >>>
> >>>> reflectors. Trust me, this is going
> somewhere...
> >>>>
> >>>> Incidentally, the tests for
> >>>> SimpleLanguageBeanReflector implement the
> >>>>
> >>>>
> >>> long-overdue
> >>>
> >>>
> >>>> testing of SimpleLanguage.set(). :)
> >>>>
> >>>> more later,
> >>>> Matt (B)
> >>>>
> >>>>
> >>>>
> >>>>
> >>>>
> >>>>
> >>>>
> >>
>
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