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| Re: [Acceleo] extending Module [message #65112 is a reply to message #65048] |
Mon, 27 July 2009 09:55  |
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Hi Mats,
Alexis' solution should work ... or you can 'really' use the extension
mechanism (what you pasted here doesn't use the extension mechanism, it
is more or less an import).
Acceleo needs two things to extend templates : the "extends" keyword on
the module itself to tell which module's templates are to be overriden,
and the "overrides" keyword on the templates. Having only the
"overrides" will not compile, having only the "extends" will only have
your extending module "import" the other, making its templates visible
(though protected templates will be visible as well with an "extends" in
stead of an "import".
That being said, your exemple should be modified as such :
----------8<----------
[module M1('http://www.eclipse.org/uml2/2.1.0/UML')/]
[template public foo()][bar()/][/template]
[template public bar()]bar[/template]
---------->8----------
----------8<----------
[module M2('http://www.eclipse.org/uml2/2.1.0/UML') extends M1/]
[template public bar() overrides bar]SomeOtherBar[/template]
[template public subfoo(c : Class) overrides foo]
[comment @main /][file ('subfoo.txt', false)][super()/][/file][/template]
---------->8----------
you will also note the use of "super" instead of directly calling "foo",
though both would work since the name of your overriding template is not
the same as the name of the overriden template (which wouldn't be true
for "bar" in this case).
Laurent Goubet
Obeo
Alexis Muller a écrit :
> On Sun, 26 Jul 2009 20:25:43 +0000, Mats Svefors wrote:
>
>> Is it possible to use the extension/inheritance functionality to
>> implement a 'template method design pattern'?
>
> Hello,
>
> Acceleo is using the first matching template it found.
>
> So you can try something like that :
>
> -------------normal.mtl---------------
> [module normal('http://www.eclipse.org/uml2/2.1.0/UML')/]
>
> [template public body(c : Class)]
> normal
> [/template]
>
>
> -----------special.mtl----------------
> [module special('http://www.eclipse.org/uml2/2.1.0/UML')/]
>
> [template public body(c : Class)]
> special
> [/template]
>
> ---------generate.mtl----------------
> [module generate('http://www.eclipse.org/uml2/2.1.0/UML')/]
> [import special/]
> [import normal/]
>
> [template public generator(c : Class)]
> [file (c.name, false)]
> class [c.name/]
> {
> [c.body()/]
> }
> [/file]
> [/template]
>
>
> Since the special module is imported before the normal one, the special
> templates are called in priority.
>
> I hope this can help you.
>
> Regards,
>
> Alexis
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