Re: [aspectj-users] inter type declaration

[Matthew Adams <matthew@xxxxxxxxxxxxxxx>]

Don't forget that the field is public in class A...

On Fri, Sep 20, 2013 at 12:42 PM, Jozsef Hegedus <jhegedus42@xxxxxxxxx> wrote:

On 20.9.2013 20.39, Andy Clement wrote:

1) I have a java class A with has no fields

class A {

}

2) I use an aspect to introduce a field called f into A

aspect X {

  public int A.f = 42;

}

3) I can use f in A as if f were hard coded (in the java source) into A.

new version of A:

class A {

  public static void main(String []argv) {

     A a = new A();

     System.out.println(a.f);

     a.f=100;

     System.out.println(a.f);

  }

}

ajc -1.5 A.java X.java

java A

42

100

What makes this work is that the ITD is PUBLIC (public int A.f = 42). You have to be compiling the system using ajc and not javac.

cheers,

Andy

On 20 September 2013 08:04, Jozsef Hegedus <jhegedus42@xxxxxxxxx> wrote:

Hi,

I think it is not possible to do the following with AspectJ but maybe I am wrong :

1) I have a java class A which has no fields.
2) I use an aspect to introduce a field called f into A.
3) I can use f in A as if f were hard coded (in the java source) into A.

Is this possible ?
I know it is possible to something similar by providing default implementations
for interfaces but that is not my question (interfaces can only have final fields).

Cheers,

Jozsef
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Thank you Andy !

Jozsef

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