| Yes, this works fine. In fact, using this approach means you can change the pointcut to pointcut myPct() : call(public T.new(..));
and it will match any constructor. The "proceed()" call doesn't require any arguments; it will use the original arguments to the constructor.
Note that you have to declare the aspect as abstract and create concrete subaspects that specify the type. For example,
abstract public aspect X<T> {...}
public aspect FooX extends X<Foo> {}
(Note that the body can be empty...)
dean On Apr 17, 2008, at 11:59 AM, Simone Gianni wrote: Hi neil,
maybe I'm wrong, but if you are intercepting a constructor, can't you
simply call proceed() to obtain the correct instance ?
public aspect X<T> {
pointcut myPct() : call(public T.new());
T around() : myPct() {
T ret = (T)proceed();
if(someTest) {
// do something with ret
}
return ret;
}
}
I can't remember exactly, but I think I already used an around advice on
a costructor to intercept object creation, an I suppose this can work
also on generics as long as rest of the aspect is supported.
Hope this helps,
Simone
neil loughran wrote:
Hi,
I have an issue where I am seeing the same kind of code in several of my
aspects. For example in the following SomeClass appears at several points
which makes me think generics would be a solution.
public aspect X {
pointcut myPct() : call(public SomeClass.new());
SomeClass around() : myPct() {
if(someTest) {
SomeClass s = new SomeClass();
// do something with s
return s;
}
else proceed();
}
}
Generic version.
abstract aspect X<T> {
pointcut myPct() : call(public T.new());
T around() : myPct() {
if(someTest) {
T s = new T(); // error
// do something with s
return s;
}
else proceed();
}
}
Unfortunately, it is not possible to instantiate a generic type from within
the aspect. Just wondering if there was a way around this?
Regards
Neil
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Dean Wampler, Ph.D. dean at objectmentor.com See also:
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