Re: [aspectj-users] add instance members to a class
Yes, Lombok is also an easy means to implement that requirement. If you
do not need Aspects for anything else, take a look at Lombok. Of course,
just like for AspectJ you need both build-time and IDE tooling in order
to work comfortably with Lombok. Steve is thinking about using marker
annotations anyway. Of course, in AspectJ you could add the members
without adding any marker annotations, as long as you can express the
set of target classes in a pointcut, which is often possible. Another
thing to consider is that Lombok does not play nice with AspectJ out of
the box, i.e you also use AspectJ for other things, you need to tweak
your build process to mix both tools. Using AspectJ only for member
(field/method) introduction as well as all other types of cross-cutting
concerns would be one-stop shopping. Depending on the situation, you can
make an informed choice to use either A or B or both at the same time.
@Tim: By instance method he means non-static methods. It is a commonly used
term.
--
Alexander Kriegisch
https://scrum-master.de
n614cd--- via aspectj-users schrieb am 29.03.2024 16:12 (GMT +01:00):
> I would instead use project Lombok annotations for the getter/setter. Lombok
> annotations are respected in most IDEs for compile support, and also for
> many build tools.
>
> What do you mean by "instance" method?
>
> Tim
>
> -Original Message-
> From: aspectj-users On Behalf Of Steve
> White via aspectj-users
> Sent: Friday, March 29, 2024 10:47 AM
> To: aspectj-users@eclipse.org
> Cc: Steve White
> Subject: [aspectj-users] add instance members to a class
>
> Hi,
>
> I'm just learning about AspectJ. I haven't been able to determine if I can
> apply it to my problem.
>
> The problem is to add an instance member, together with getters/setters, to
> certain existing classes. This seems to be an example of a crosscutting
> concern.
>
> So far, I have managed with AspectJ only to produce classes with new static
> members.
>
> Is it possible with AspectJ to create an annotation, say @Labelled, so that
>
> @Labelled
> public class LabelledClass extends PlainClass{
> }
>
> so that instances of LabelledClass will have their own private String member
> "itsLabel", with a getter "getLabel()", and a setter "setLabel()". That is,
> so that LabelledClass effectively implements
>
> interface LabelledInterface{
> String getLabel();
> void setLabel( String label );
> }
>
> How would one go about this? Is something like this possible?
>
> If this kind of thing isn't possible, where can I find passages in the
> documentation that would clarify the situation?
>
> Thanks!
> ___
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> aspectj-users@eclipse.org
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> https://www.eclipse.org/mailman/listinfo/aspectj-users
>
> ___
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>
>
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Re: [aspectj-users] add instance members to a class
I would instead use project Lombok annotations for the getter/setter. Lombok
annotations are respected in most IDEs for compile support, and also for
many build tools.
What do you mean by "instance" method?
Tim
-Original Message-
From: aspectj-users On Behalf Of Steve
White via aspectj-users
Sent: Friday, March 29, 2024 10:47 AM
To: aspectj-users@eclipse.org
Cc: Steve White
Subject: [aspectj-users] add instance members to a class
Hi,
I'm just learning about AspectJ. I haven't been able to determine if I can
apply it to my problem.
The problem is to add an instance member, together with getters/setters, to
certain existing classes. This seems to be an example of a crosscutting
concern.
So far, I have managed with AspectJ only to produce classes with new static
members.
Is it possible with AspectJ to create an annotation, say @Labelled, so that
@Labelled
public class LabelledClass extends PlainClass{
}
so that instances of LabelledClass will have their own private String member
"itsLabel", with a getter "getLabel()", and a setter "setLabel()". That is,
so that LabelledClass effectively implements
interface LabelledInterface{
String getLabel();
void setLabel( String label );
}
How would one go about this? Is something like this possible?
If this kind of thing isn't possible, where can I find passages in the
documentation that would clarify the situation?
Thanks!
___
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Re: [aspectj-users] add instance members to a class
Hi Steve.
I think we know each other from GitHub issue #299. Welcome to the
mailing list channel, too.
First, a few links for you:
How to declare an interface and its implementation including fields and
accessor methods by means of inter-type declarations (ITD) in native
AspectJ syntax:
https://eclipse.dev/aspectj/doc/latest/progguide/progguide.html#language-interType
The chapter right below that one also showcases some basic AspectJ
examples, among them ITD ones. Just search for "declare parents", if
scrolling is too tedious.
The corresponding chapter explaining ITDs in annotation-style is here:
https://eclipse.dev/aspectj/doc/latest/adk15notebook/adk15notebook.html#ataspectj-itds
There, you find an example explaining how to achieve a similar result as
in native syntax in the less powerful (but still powerful enough)
annotation syntax by means of "@DeclareParents" and "@DeclareMixin",
respectively.
I hope this helps. If you need more support, please share an MCVE
(https://stackoverflow.com/help/mcve), ideally a GitHub project or in
old-school fashion by attaching a zip or tar.* archive to your next
message, and I will do my best to help you sort out the details.
Cheers
--
Alexander Kriegisch
https://scrum-master.de
Steve White via aspectj-users schrieb am 29.03.2024 15:47 (GMT +01:00):
> Hi,
>
> I'm just learning about AspectJ. I haven't been able to determine if
> I can apply it to my problem.
>
> The problem is to add an instance member, together with
> getters/setters, to certain existing classes. This seems to be an
> example of a crosscutting concern.
>
> So far, I have managed with AspectJ only to produce classes with new
> static members.
>
> Is it possible with AspectJ to create an annotation, say @Labelled, so that
>
> @Labelled
> public class LabelledClass extends PlainClass{
> }
>
> so that instances of LabelledClass will have their own private String
> member "itsLabel", with a getter "getLabel()", and a setter
> "setLabel()". That is, so that LabelledClass effectively implements
>
> interface LabelledInterface{
> String getLabel();
> void setLabel( String label );
> }
>
> How would one go about this? Is something like this possible?
>
> If this kind of thing isn't possible, where can I find passages in the
> documentation that would clarify the situation?
>
> Thanks!
> ___
> aspectj-users mailing list
> aspectj-users@eclipse.org
> To unsubscribe from this list, visit
> https://www.eclipse.org/mailman/listinfo/aspectj-users
>
>
___
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[aspectj-users] add instance members to a class
Hi,
I'm just learning about AspectJ. I haven't been able to determine if
I can apply it to my problem.
The problem is to add an instance member, together with
getters/setters, to certain existing classes. This seems to be an
example of a crosscutting concern.
So far, I have managed with AspectJ only to produce classes with new
static members.
Is it possible with AspectJ to create an annotation, say @Labelled, so that
@Labelled
public class LabelledClass extends PlainClass{
}
so that instances of LabelledClass will have their own private String
member "itsLabel", with a getter "getLabel()", and a setter
"setLabel()". That is, so that LabelledClass effectively implements
interface LabelledInterface{
String getLabel();
void setLabel( String label );
}
How would one go about this? Is something like this possible?
If this kind of thing isn't possible, where can I find passages in the
documentation that would clarify the situation?
Thanks!
___
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