[aspectj-dev] @annotation - more news.

[Andrew Clement <CLEMAS@xxxxxxxxxx>]

Following on from yesterdays post, I've now uploaded
a dev 
build of AspectJ where @annotation can be used for
binding with
*any* of the kinded PCDs.  (yesterday it was
just call/execution)

The dev build is here:

http://download.eclipse.org/technology/ajdt/dev/aspectj-DEVELOPMENT.jar

You can now write this kind of thing, which uses annotations

on field-set join points:

---------8<-----------------
import java.lang.annotation.*;

@Retention(RetentionPolicy.RUNTIME)
@interface Colored {String value();}

public class A {

  @Colored("red") static int i;

  public static void main(String[] argv) {
    i = 5;
  }

  static aspect X {
    before(Colored c): set(* *) &&
@annotation(c) {
      if (c.value().equals("red"))

      System.err.println("The
red field is being set!!");
    }
  }

}
---------8<-----------------

You can even write this:

  before(Colored c): @annotation(c) { }

which will bind to Colored annotations at any of the
join points
encountered.  Here is a useful table from the
developers 
notebook - it tells you what the subject for each
join point kind.
It is the subject which we attempt annotation matching
on for that
join point:

Join Point Kind        Subject
Method call            The
method picked out by Java as the static target of the method call.
Method execution       The method that
is executing.
Constructor call       The constructor
being called.
Constructor execution  The constructor executing.
Field get            
 The field being accessed.
Field set            
 The field being set.
Pre-initialization     The first constructor
executing in this constructor chain.
Initialization         The first
constructor executing in this constructor chain.
Static initialization  The type being initialized.
Handler            
   The declared type of the exception being handled.Advice executionThe
advice being executed. 

Two pieces of annotation binding work remain, @this()
and @args().  

Any feedback is welcomed - an AJDT containing this
feature will be
available shortly.

cheers,
Andy
---
Andy Clement.
AspectJ Development
clemas@xxxxxxxxxx