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[morph-developer] RuntimeException wrapping (was: SimpleLanguageBeanReflector)
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From: Matt S. <Mat...@wh...> - 2007-02-22 14:37:31
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Awesome, thanks Matt B.
I've given this a lot of thought, and whether or not to wrap exceptions
should be based on whether or not the reflector or transformer delegates
to some other reflector or transformer. If there is no delegation, then
go ahead and wrap the exceptions because that is a Morph class. If
there is delegation, there is a potential that the delegate is a user
defined object rather than a Morph object, so there should not be
runtime exception wrapping.
Matt S
Matt Benson wrote:
> Gotcha--forgot about the RuntimeException wrapping
> issue. Matt, since you've given your blessing here I
> can make time to stuff this in, with the behavior flag
> you had declared it was your intent to use. I'd like
> for Morph to become the indisputably "right" way to do
> Java object conversions. ;)
>
> -Matt
>
> --- Matt Benson <gud...@ya...> wrote:
>
>
>> 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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>>>>>
>>>>>
>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
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>>
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>>>>>>>
>>>>>>>
>>>>>>>
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>>>>>
>>>>>
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>>>>>
>>>>>
>>>>>
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>>
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>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
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