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How to use generic types with for sequence? [message #986838]

Wed, 21 November 2012 16:40

Eclipse User

Hello,

For my studies I develop an HTML code generator with Acceleo v3.3.1.

To do this I have to run through different classes that didn't get the same ancestors (probably a mistake in my ecore model but it is to late to change it), how can I do to loop over all the classes? I tried to cast them with OclAny and T but the twice give me the following error:

Module generateHtml for block for (aContenu.oclAsType(site::Rubrique).eContents()). site.impl.TexteImpl was not an instanceof T.

Here is the code where the error is thrown:

[for (aDiv : T | aContenu.oclAsType(Rubrique).eContents())]
[if aDiv.oclIsTypeOf(Texte) ]
<p class="texte">[aDiv.oclAsType(Texte).texte /]</p>
[/if]
[if aDiv.oclIsTypeOf(Lien) ]
<a href="aDiv.oclAsType(Lien).adresse">[aDiv.oclAsType(Lien).libelle/]</a>
[/if]
[/for]

Thanks for your help, and sorry for my english (I'm french)..

Re: How to use generic types with for sequence? [message #986870 is a reply to message #986838]

Thu, 22 November 2012 03:01

Eclipse User

Hi,

Having a common superclass would be the easiest way, but you can also do through ifs :

[for (aDiv: EObject | aContenu.eContents())]
  [if (aDiv.oclIsKindOf(Rubrique) or aDiv.oclIsKindOf(AnotherType) or ...]
    generate this
  [/if]
[/for]

Laurent Goubet
Obeo

Re: How to use generic types with for sequence? [message #986940 is a reply to message #986870]

Thu, 22 November 2012 07:52

Eclipse User

Thanks for your reply.

I tried with EObject as generic type but it says me "Invalid Type: EObject" and it fails at the compilation.

I also tried with T and OclAny which didn't show any advertissement but which also fails at the compilation time with the following message:

org.eclipse.acceleo.engine.AcceleoEvaluationException: Invalid type for iteration at line 24 in Module generateHtml for block for (aContenu.eContents()). site.impl.TexteImpl was not an instanceof T.

Re: How to use generic types with for sequence? [message #986988 is a reply to message #986940]

Thu, 22 November 2012 12:24

Eclipse User

Hi

OCL has yet to be fully aligned with UML 2.x and so there is no support
for generic types; consequently there is no support for generic types in
Acceleo.

In the Ecore-based version of Eclipse OCL, "T" and "T1" are magic
non-types used for declaration purposes of e.g. Set(T) which looks like
but is not a UML templated type. Their specified semantics is unclear.
Don't expect them to do anything useful for you.

The new Pivot-based version of Eclipse OCL prototypes a variety of UML
alignment resolutions including support for generic types. "T" and "T1"
are no longer magic, they are just the names of declared template
parameters.

Regards

Ed Willink

On 22/11/2012 12:52, TASSIN Florian wrote:
> Thanks for your reply.
>
> I tried with EObject as generic type but it says me "Invalid Type:
> EObject" and it fails at the compilation.
>
> I also tried with T and OclAny which didn't show any advertissement
> but which also fails at the compilation time with the following message:
> org.eclipse.acceleo.engine.AcceleoEvaluationException: Invalid type
> for iteration at line 24 in Module generateHtml for block for
> (aContenu.eContents()). site.impl.TexteImpl was not an instanceof T.

Re: How to use generic types with for sequence? [message #987047 is a reply to message #986988]

Fri, 23 November 2012 02:57

Eclipse User

Florian,

T is a non-existing type and should not be used, Ed explained that better than I could.

You have to use an existing type for the loop variable, and the best choice when you have no common-supertypes is EObject. If it is not recognized as-is by OCL, use its qualified name :

[for (aDiv: ecore::EObject | aContenu.eContents())]
  [if (aDiv.oclIsKindOf(Rubrique) or aDiv.oclIsKindOf(AnotherType) or ...]
    generate this
  [/if]
[/for]

Laurent Goubet
Obeo

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