Re: [aspectj-users] How can i change modifier from private to public? AS

["Eric Bodden" <eric.bodden@xxxxxxxxxxxxxx>]

Hi, Timo.

Just one question: Why are you using AspectJ for this? IMHO it would
be way easier to use an open Java compiler (e.g. JastAdd) and alter
its type checker.

Eric

On 18/02/2008, Timo Meinen <aspectj-users@xxxxxxxxxxxxx> wrote:
> Hi,
>
> I am writing my master's thesis and using AspectJ for a special access
> control enforcement due to the thesis' challenge. I want to loosen the
> access control of the 'private' modifier. For example it is possible to
> realize a friendship-concept of classes. My problem is, that objects shall
> have access to private-fields and -methods, but then, the compiler won't
> compile. My solution is to preprocess these private modifiers  and convert
> them into public. The correct access control enforcement is done by an
> aspect.
>
> @AccessControl
> private int foo;
>
> shall be converted to
>
> @AccessControl
> public int foo;
>
> After this covnersion, the appropriate aspects should work on the
> annotated, public fields and methods.
>
> The affected modifiers are identified by an annotation. At the moment I am
> using a Java-6 processor and modify the abstract syntax tree (AST), which
> is on the one hand complex and on the other not AspectJ compatible (I
> think).
>
> How can I solve this problem with AspectJ?
>
> Some ideas/questions:
> 1) Is AspectJ able to process annotations with an Javac-6-Processor?
> 2) Can AspectJ change the access modifier before compilation?
> 3) Is it possible that AspectJ converts private to public "on the fly"
> before compiling? It is important, that the original source file isn't
> modificated.
> 4) Can I modify the AST of the AspectJ-Compiler? Is there a API available?
> 5) Do I have to use a preprocessor? Does anyone know a preprocessor with
> this annotation capabilities? I wasn't able to get it to work with APT.
> But I would love to have a all-in-one-AspectJ-solution.
>
> Thank you very much for your ideas.
>
> Timo Meinen (timomeinen@xxxxxxxxx)
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-- 
Eric Bodden
Sable Research Group
McGill University, Montréal, Canada