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| Re: EMF Validation OCLParser EcoreEnvironment.findPackage and empty packages. [message #415209 is a reply to message #415208] |
Wed, 05 December 2007 13:47  |
Eclipse User |
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Originally posted by: cdamus.ca.ibm.com
Hi, Loïc,
This is really an OCL question, hence I am replying to that newsgroup.
The EcoreEnvironment tries to be more robust. If it can't find the
referenced package by the nesting structure, then it attempts to find an
EPackage whose nsPrefix matches what EMF produces by default (being simply
a dot-separated list of the package names). For example, in resolving
a::b::c, if the "a" package can't be found, the environment tries looking
for a package whose nsPrefix is a.b.c.
Another thing you can do is to initialize your EcoreEnvironment with a
default package, specifying the root package that isn't registered. Then,
package name references that are relative to this root package (or even
absolute names, I think) should be registered.
Otherwise, if a package cannot be found, I don't see how OCL can assume that
the reason is an empty root package that isn't registered, and proceed by
looking up the child. It can easily get entirely the wrong package.
Perhaps you should follow this enhancement request:
https://bugs.eclipse.org/bugs/show_bug.cgi?id=142856
and maybe even contribute a patch!
Cheers,
Christian
Loïc Quéran wrote:
> Empty packages are not generated by EMF. See
> http://dev.eclipse.org/newslists/news.eclipse.tools.emf/msg1 1984.html
> for an explanation on this.
>
> org.eclipse.ocl.ecore.EcoreEnvironment.findPackage(List<String >
> packageNames, EPackage.Registry registry) explicitely searches root
> level packages (line 558):
>
> // only consider root-level packages when searching by name
> if ((ePackage.getESuperPackage() == null)
> && EcoreForeignMethods.isNamed(name, ePackage))
> {
> ...
> }
>
> Packages which are not generated won't be registered, hence won't be
> found.
>
> Unless I miss something, EMF Validation will not parse OCL files
> correctly if the "target" ecore's top level package is empty.
>
> Have I missed something ? Shouldn't the EcoreEnvironment algorithm be
> somewhat more robust ?
>
> Loïc
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