Re: [aspectj-users] passing instance of parent class to aspect

[miro <miroconnect@xxxxxxxxx>]

what is the difference retrieving form from jointpoint and passing 
retrieving it by this(f)  ?


Andy Clement wrote:
> 
> I would not use @annotation, I would match statically on your methods:
> 
> @Before("execution(@WorkflowAction * *(..)))")
> 
> Passing the form instance is straightforward:
> 
> @Before("execution(@WorkflowAction * *(..))) && this(f)")
> public void goo(Page.Form formInstance) {}
> 
> Accessing the outer instance of Page is not so eay.   Here are the
> options:
> 
> 1) define a getter in Form and call it from the advice
> 
> public void getPage() {
>   return Page.this;
> }
> 
> 2) Write a more complex pointcut that uses a wormhole pattern to pass the
> enclosing instance through to the advice:
> 
> @Before("execution(@WorkflowAction * *(..)) && cflow(this(p))")
> public void foo(Page p) { }
> 
> 
> 3) use an AspectJ code style intertype declaration to add that getter from
> option (1):
> 
> public Page Page.Form.getPage() {
>   return Page.this;
> }
> (this could possibly be done in annotation style @DeclareParents, but just
> the thought of the messiness of that declaration puts me off trying it)
> 
> 4) Rely on how the compiler implements inner classes:
> 
> public void goo(Page.Form formInstance) {}
>             Field f = Page.Form.class.getDeclaredField("this$0");
>             f.setAccessible(true);
>             System.out.println("Page is " + formInstance.get(p));
> }
> 
> Andy
> 
> 
> 2008/12/12 miro <miroconnect@xxxxxxxxx>
> 
>>
>> I want to take control  through my aspect for any method which is
>> annotated
>> with  @WorkflowAction.
>> here is my example
>>
>>  public class Page(){
>>        Page(){
>>            add(new Form());
>>        }
>>
>>        // inner class
>>         public Class Form  {
>>                @WorkflowAction()
>>                void somemethod()
>>         }
>>
>> }
>> My aspect comes in picture when the somemethod()  is called and I am
>> wondering is there a way I can pass instance of page to my aspect ?
>>
>> here is my aspect
>>
>>        @Before("@annotation(gov.hhs.acf.aop.aspects.WorkflowAction)")
>>        public void transferWorkflowContext(JoinPoint joinPoint){
>>          //here  I want to access the page instance
>>        }
>>
>>
>>
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>>
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> 
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