You might even consider "the simplest thing that could possibly work";
preprocess the source file with a Perl script to change the "private"
to "public", then compile the output file with javac. Would that be
sufficient?
On Feb 18, 2008, at 9:48 AM, Timo Meinen wrote:
Hi Eric,
thank you for the hint. I will have a look at it. It might be a good
idea using an "own" Java compiler. Although, I wanted to learn AOP
and the access control seemed to be a nice playground. :-)
Timo
Am 18.02.2008, 16:38 Uhr, schrieb Eric Bodden <[EMAIL PROTECTED]
>:
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 <[EMAIL PROTECTED]> 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 ([EMAIL PROTECTED])
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Dean Wampler, Ph.D.
dean at objectmentor.com
http://www.objectmentor.com
See also:
http://www.aspectprogramming.com AOP advocacy site
http://aquarium.rubyforge.org AOP for Ruby
http://www.contract4j.org Design by Contract for Java5
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