Re: [ajdt-dev] AJDT and ITDs

[Simone Gianni <simoneg@xxxxxxxxxx>]

Hi Andrew,
thanks for the fast and in-depth answer. I arrived to 
ITDAwareNameEnvironment and was following my way back to "the core" of 
it. You gave me the right pointers.

I have basically this problem, and I was trying to understand internals 
of AJDT to see if this is achievable at all, and if I could eventually 
contribute somehow.

Suppose I have a User class, packaged in A.jar. Then I have an aspect 
ITD getIQ() on user, packaged in B.jar.

Now, from a different project, that "depends" on A.jar and B.jar, I want 
to call User.getIQ().

If I place A.jar on the inpath and B.jar on the aspectpath, AspectJ 
itself gives no error at all, and in fact there is no error in the 
package view. But if I open the .java or .aj file making the call, I can 
see reconciliation errors, and no ITD content assist for user.getIQ(). 
(should I raise a bug for this? I have it ready :D )

I'm using this construct (aspect libraries adding new functionalities to 
classes in different libraries using ITDs) all the way around, and then 
they are composed together on a third package that need to use the 
original classes with the additional functionalities. It works in 
AspectJ, but it is a pain while writing it in Eclipse, due to 
reconciliation errors and lack of content assist.

I was hoping that bug 271269 
<https://bugs.eclipse.org/bugs/show_bug.cgi?id=271269> was somehow going 
to resolve this issue, but it seems that it adds "source->binary" ITDs, 
while "binary->binary" ITDs are not handled, while they work in AspectJ.


I noticed that in ITDAwareNameEnvironment, in the find(String,String) 
method, if the found type is a binary then no ITD interpolation is 
performed, and it does not exist an ITDAwareBinaryType* class.

Exploring the AJProjectModelFacade however I can see many places where 
it tries to access AJ data from resources in jar files or class files.

Is it a hard work to get that working? Theoretically if AJDT is able to 
extract ITDs from binary aspects, and to apply ITDs to binary classes 
(for bug 271269), the hardest pieces should be there.


Simone

Andrew Eisenberg wrote:
> Sure.  AJDT uses the crosscutting model from AspectJ as the base.  The
> entry point into the AspectJ model is the AJProjectModelFacade class
> (and AJProjectModelFactory to create them).  This class allows you to
> convert from IJavaElement handles to IProgramElement handles, as well
> as ask interesting questions about what elements crosscut other
> elements.
>
> This information is used to seed content assist, gutter markers, the
> crosscutting view, etc.  Gutter markers and crosscutting view are easy
> since that is basically just taking a projection of the underlying
> model and transforming it to the correct format.
>
> ITD Aware content assist is a bit more complex because we need to
> trick JDT into thinking that ITDs really exist in the target type.
> ITDInserter and ITDAwareSourceTypeElementInfo are two classes that
> handle this mocking up of ITDs.
>
> There is a code sample on AJProjectModelFacade available on this wiki page:
> http://wiki.eclipse.org/Developer%27s_guide_to_building_tools_on_top_of_AJDT_and_AspectJ
>
> I'm happy to go into more detail if you have any questions.
>
> On Wed, Jul 22, 2009 at 1:14 PM, Simone Gianni<simoneg@xxxxxxxxxx> wrote:
>   
> > Hi all,
> > this is the first time I have a serious look at AJDT internals, so please
> > forgive me if I ask stupid questions :)
> >
> > I'm trying to figure out how AJDT fetches information from the underlying
> > AJ, especially regarding ITDs. Does AJDT "re-reads" the .class files
> > generated by AJ build? Or does it parses pointcuts and check them using the
> > matcher? Or what else? :D
> >
> > I'm talking about informations to display ITD content assist as well as
> > cross reference view, even if I think these use different methods.
> >
> > If you can point me to relevant part of code I'll then try to figure it out
> > on my own.
> >
> > Simone
> >
> > --
> > Simone Gianni            CEO Semeru s.r.l.           Apache Committer
> > http://www.simonegianni.it/
> >
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> >
> >     
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--
Simone Gianni            CEO Semeru s.r.l.           Apache Committer
http://www.simonegianni.it/