topic Re: How to get all class elements? in Application Development and Automation Discussions

How to get all class elements?

Former Member — Tue, 15 Aug 2017 08:11:00 GMT

Hello,

How to get all elements from class.

I want to clear all global variables. But I don't know, how I get all global elements from my Abap class.

I hope, you could help me.

Re: How to get all class elements?

pokrakam — Tue, 15 Aug 2017 08:27:34 GMT

An ABAP class doesn't have any global variables. All attributes are local to the class.

RTTI services can provide you all components of a class, use CL_ABAP_CLASSDESCR.

Re: How to get all class elements?

retired_member — Tue, 15 Aug 2017 08:27:51 GMT

CL_ABAP_CLASSDESCR

Loop over the attribute table, dynamic assign to field symbol (attribute must be visible), CLEAR field symbol.

Re: How to get all class elements?

matt — Tue, 15 Aug 2017 10:16:26 GMT

If you mean how to clear all statics in a class - write a method to do it and call that.

Re: How to get all class elements?

Former Member — Tue, 15 Aug 2017 11:59:03 GMT

I want to do this dynamic and don't want to clear every variable by hand.

Re: How to get all class elements?

Former Member — Tue, 15 Aug 2017 12:29:15 GMT

and how i could clear all these components or is it not possible?

Re: How to get all class elements?

UweFetzer_se38 — Tue, 15 Aug 2017 12:31:02 GMT

I'd just create a new reference, let the garbage collector do the rest for you...

(after clearing all public and private variables the whole class is initial, isn't it? Or am I missing something?)

Re: How to get all class elements?

SuhaSaha — Tue, 15 Aug 2017 12:56:28 GMT

@OP: What is your motivation for clearing the attributes of the instance?

Re: How to get all class elements?

retired_member — Tue, 15 Aug 2017 13:09:27 GMT

Loop over the attribute table, dynamic assign to field symbol, CLEAR field symbol. Basic stuff.

Re: How to get all class elements?

Former Member — Tue, 15 Aug 2017 13:37:42 GMT

How I get these attribute table. I don't manually used the CL_ABAP_CLASSDESCR before.

Re: How to get all class elements?

pokrakam — Tue, 15 Aug 2017 14:12:00 GMT

If you haven't done this before, then I would ask why you think you need to do it this way?

See answers from Uwe and Suhas.

Re: How to get all class elements?

retired_member — Tue, 15 Aug 2017 14:19:29 GMT

Have you even looked at it?

Re: How to get all class elements?

retired_member — Tue, 15 Aug 2017 16:48:57 GMT

OK for instance attributes. But I think the OP means static attributes by saying global variables.

Re: How to get all class elements?

UweFetzer_se38 — Tue, 15 Aug 2017 16:57:19 GMT

Then I would use a structure instead of single variables.

Dynamic programming just to clear variables would be "mit Kanonen auf Spatzen schießen" IMO. But possible of course.

Re: How to get all class elements?

retired_member — Tue, 15 Aug 2017 17:07:51 GMT

If it's your class ...

Re: How to get all class elements?

pokrakam — Tue, 15 Aug 2017 20:19:08 GMT

Does that mean a public instance attribute is less global than a private static attribute?

Is there a globality ranking published somewhere I can use for future reference? 😉

Re: How to get all class elements?

retired_member — Wed, 16 Aug 2017 05:19:32 GMT

Independently from what the OP meant, you cannot clear all attributes by garbage collection but only instance attributes. Since he said "all elements from class", it is justified to assume that he meant all attributes including static attributes.

The terms for your reference are defined in the ABAP Glossary, e.g. global data, which, alas, are seldom use here .

Re: How to get all class elements?

pokrakam — Wed, 16 Aug 2017 08:19:23 GMT

It was a joke. You assumed he meant static, but if someone inaccurately calls attributes global, which they clearly aren't (as I said in my first response), then they would not necessarily have the same view.

If we try to define the globularity (globulosity?) of scope vs lifetime, one could argue that that which is visible to the outside looks 'global', making a public 'more global' than a private static, even though it has a shorter lifetime.

But, just in case someone draws any conclusions, all of this is nonsense of course 🙂

Re: How to get all class elements?

matt — Wed, 16 Aug 2017 09:23:42 GMT

Clearing all the static attributes of a class indicates that your design is poor. I can't see why the complexity of doing it dynamically could be preferable. I've never written a class where this was needed, and I've written thousands.

Consider using the singleton pattern instead. Then you can have a static method that creates and new instance, and returns that (clearing the old one).

Re: How to get all class elements?

matt — Wed, 16 Aug 2017 09:25:18 GMT

Your question is bit poor. Rather than ask how to implement your chosen solution to the programming problem, you should explain what you are trying to achieve in general. Then you may get other solutions that are better than your preferred one (dynamic clearing of static attributes, it seems). Furthermore, it means people don't have to guess at your intentions, thereby increasing the quality of the answers.