Re: Modify Java source file at compile time, possible?

Not sure it's a problem. It's depends on you exact use case. Can you
give me a more exact example?

Olivier

On 12 juin, 01:16, Kevin Qiu <kevin.jing....@gmail.com> wrote:
> thanks for the reply. the problem is (I should've pointed out) that my Foo
> class is already managed through dependency injection container (gin), which
> means there's already a deferred binding implementation generated by
> ginjector.
>
> On Fri, Jun 11, 2010 at 5:58 PM, Olivier Monaco <olivier.mon...@free.fr>wrote:
>
> > Hi Kevin,
>
> > You can rewrite your Foo class as:
>
> > public class Foo implements MagicClass {
> >  @Trace
> >  @Secured
> >  public void bar() {
> >  }
> > }
>
> > Then, associate a generator for sub-types of MagicClass and use
> > GWT.create to instantiate a new Foo.
>
> > GWT.create(Foo.class);
>
> > So your generator will be called. It can generate a FooImpl class that
> > extends the Foo class and override the bar method as follow:
>
> > public class FooImpl extends Foo {
> >  public void bar() {
> >    Log.log("begin of bar");
> >    try {
> >      SecurityContext.checkAuthorized();
> >      super.bar();
> >    }
> >    finally {
> >      Log.log("end of bar");
> >    }
> >  }
> > }
>
> > Where "Log.log" print some logs and "SecurityContext.checkAuthorized"
> > throws an error is the user is not authorized. This could be funny and
> > not really hard to do.
>
> > Olivier
>
> > On 11 juin, 18:09, Kevin Qiu <kevin.jing....@gmail.com> wrote:
> > > Hi,
>
> > > I know GWT can generate Java source code with deferred binding. But
> > > sometimes, I don't want to generate a new implementation, but based on
> > some
> > > annotations, I want to have the ability of injecting code at compile
> > time.
>
> > > e.g., with the class below
>
> > > public class Foo {
> > >   @Log
> > >   public void bar() {
> > >     @CheckPermission
> > >     dosomething();
> > >   }
>
> > > }
>
> > > At compile time, I want to have the ability to get the annotations
> > available
> > > on items, and inject code according to my application logic. So here, the
> > > compiler should see:
> > > public class Foo {
> > >   public void bar() {
> > >     log("begin");
> > >     if (hasPermission()) {
> > >       doSomething();
> > >     } else {
> > >       error();
> > >     }
> > >   }
>
> > > }
>
> > > with the extra code being injected. I'm wondering if anything in GWT
> > allows
> > > me to do that?
>
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