Policy regarding creating global or local classes?

Hi!
What policy do you have regarding creating local or global classes in your company? We have decided to mostly use local classes since there is a risk of reusing global classes (when changing something in the global class after it has been used by several programs etc.) . But on the other side it is much easier to use transaction SE24 than creating all the includes by hand. Have anyone else made thoughts about this issue?
Regards, Tine

Hi,
The policy is
Create global class if you want the class to be reused.
And to avoid problems when you change the class, make sure you change class in such a way that it does not effect the existing user's of the class.
Like use OPTIONAL parameters when you change method signature, avoid changing method names, instead add new methods.
You should use local classes only when you are sure that the code there is needed only by your program and nobody else.
If you keep creating local class's and if two programs need the same class it is redundant to create local class's and if you want a change in the class you have to change in all the places.
I hope it is clear.
Regards,
Sesh

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Thanks in advance!

We have a winner!
Thanks Rich!
It's not a 100% solution - I was hoping to be able to generate global classes/interfaces using source code alone, without requiring user intervention.
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What is meant by Local Class and how we can create local classes in abap?

Hi Friends
what is meant by Local Class and how we can create local classes in abap?
Regards,
Sree

Hi
Local classes are the classes which we declare and use using the SE38 ABAP editor
Global classes are the classes which we find in SE24 and call the methods of them into our program.
see the sample code
REPORT zs_class.
SELECTION SCREEN
SELECTION-SCREEN BEGIN OF BLOCK b1 WITH FRAME.
PARAMETERS:p_var TYPE i,
p_var1 TYPE i.
SELECTION-SCREEN END OF BLOCK b1.
CLASS d_class DEFINITION
CLASS d_class DEFINITION.
PUBLIC SECTION.
METHODS:
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sub.
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ENDCLASS. "d_class DEFINITION
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ENDMETHOD. "sub
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START-OF-SELECTION
START-OF-SELECTION.
DATA: obj TYPE REF TO d_class.
CREATE OBJECT: obj .
CALL METHOD: obj->add,
Regards
Anji

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thanks !

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Local class - global class

Hi Friends,
Can a local class make friend with global class???
for example i have a local class in se38 editor and this local class should access the private attribute of global class which is there in se24.
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HI Deepak
Yo can define your ABAP Unit test class as a friend of the global class to be tested in the local class definition include of your global class. So, you have to add a line of code like
CLASS <name of global class to be tested> DEFINITION LOCAL FRIENDS <name of local ABAP Unit class> in the include where the definition of local ABAP Unit Class is in. Then you can call the private methods of your global class in the local abap unit class methods.
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http://help.sap.com/saphelp_nw2004s/helpdata/en/ec/d9ab291b0b11d295400000e8353423/content.htm
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Local class as a friend of a global class

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Regards Christian

Hi Christian,
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CLASS in the include where the definition of local ABAP Unit Class is in. Then you can call the private methods of your global class in the local abap unit class methods.
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Is there a way to create a structure or a local class inside of another?

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you can do something like this.
public class MyStruct {
public String name;
public int number;
public double value;
public class Test {
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Hi,
i try to import local classes to global classes and i have error ,
in the program in se 80 (lcocal) i declare global declaration
like:
TYPE-POOLS icon.
TYPES: ty_fuel TYPE p DECIMALS 2,ty_cargo TYPE p DECIMALS 2.
and after that i declare the local class in includes .. and/// start of selection
where i put it ?
Regards

Hi,
i don't build another program the declaration is in the local progarm,
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where i put this declaration i try in local types but i have error .
Explicit length specifications are necessary with types C, P, X, N, and
W in the OO context.
Regards

How do you create a new local zone w/o all the global zone packages

I have serveral servers with hundreds of packages added w/o the pkgadd -G option. Everytime I create a new local zone, the local zone inherits all the global zone packages. Is there a way to modify maybe the packaging DB to stop the automatic inhertitance of packages to create new empty local zone ?
Edited by: cslew on Feb 4, 2008 8:02 PM

Not really.
If we're talking about sparse zones, they share the root partition with the global zone anyway, so regardless of whether the packages were 'registered' with the zones, they would get the software anyway.
Of course, not registering the packages would speed up the patching process as it wouldnt have to futz around updating all the local package repositories.
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If we're talking about a full root zone, then it ought to be possible in theory.
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Create Global Object Policy

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Problem with local class, static private attribute and public method

Hello SDN,
Consider the following situation:
1) I have defined a LOCAL class airplane.
2) This class has a private static attribute "type table of ref to" airplane (array of airplanes)
3) A public method should return the private static table attribute
Problems:
a) The table cannot be given as an EXPORTING parameter in the method because TYPE TABLE OF... is not supported and I get syntax errors. I also cannot define a dictionary table type because it is a local class.
b) The table cannot be given as a TABLES parameter in the method because TABLES is not supported in the OO context.
c) The table cannot be given as an EXPORTING parameter in the method defined as LIKE myStaticAttribute because my method is PUBLIC and my attribute is PRIVATE. ABAP syntax requires that all PUBLIC statements are defined before PRIVATE ones, therefore it cannot find the attribute to reference to with LIKE.
I see only 2 solutions:
a) Never ever use local classes and always use global classes so that I might define a dictionary table type of my class which I can then use in my class.
b) Make the attribute public, but this goes against OO principles, and isn't really an option.
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Hello Niels
Since your class is local and, thus, only know to the "surrounding" application is does not really make sense to make it public to any other application.
However, if you require to store instances of your local classes in internal tables simply use the most generic reference type possible, i.e. OBJECT.
The following sample report shows how to do that. Furthermore, I believe it also shows that there are no serious inconsistency in the ABAP language.
*& Report ZUS_SDN_LOCAL_CLASS
REPORT zus_sdn_local_class.
" NOTE: SWF_UTL_OBJECT_TAB is a table type having reference type OBJECT
* CLASS lcl_airplane DEFINITION
CLASS lcl_airplane DEFINITION.
PUBLIC SECTION.
 DATA: md_counter(3) TYPE n.
 METHODS: constructor,
 get_instances
 RETURNING
 value(rt_instances) TYPE swf_utl_object_tab.
PRIVATE SECTION.
 CLASS-DATA: mt_instances TYPE swf_utl_object_tab.
ENDCLASS. "lcl_airplane DEFINITION
* CLASS lcl_airplane IMPLEMENTATION
CLASS lcl_airplane IMPLEMENTATION.
METHOD constructor.
 APPEND me TO mt_instances.
 DESCRIBE TABLE mt_instances.
 md_counter = syst-tfill.
ENDMETHOD. "constructor
METHOD get_instances.
 rt_instances = mt_instances.
ENDMETHOD. "get_instance
ENDCLASS. "lcl_airplane IMPLEMENTATION
DATA:
gt_instances TYPE swf_utl_object_tab,
go_object TYPE REF TO object,
go_airplane TYPE REF TO lcl_airplane.
START-OF-SELECTION.
" Create a few airplane instance
DO 5 TIMES.
 CREATE OBJECT go_airplane.
ENDDO.
gt_instances = go_airplane->get_instances( ).
CLEAR: go_airplane.
LOOP AT gt_instances INTO go_object.
 go_airplane ?= go_object.
 WRITE: / 'Airplane =', go_airplane->md_counter.
ENDLOOP.
END-OF-SELECTION.
Regards
Uwe

When is it best to use Local Classes..?

Hi All,
We all know that a global class creation is very helpful wherein the class can be reused by multiple programs.In contrast when is it best to use a local class within the program...?
Can anyone please share the sample scenarios where we need to make use of a local class...?
Cheers
Nishanth

Hi Nishanth,
First of all, there will be a few cases when creating a local class in your program is mandatory. For example,
if you're using an ALV Grid on your screen using the OO Approach, then you must declare a class locally in
your program if you want to handle the events. You cannot use a subroutine in this case.
Secondly, if you are looking for an explanation that is more introductory in nature, then the ABAP Programming
help has got some good documentation. Here are the links which explain the concepts with an example as a
transition from function groups to classes -
http://help.sap.com/saphelp_nw04/helpdata/en/ce/b518b6513611d194a50000e8353423/frameset.htm
Regards,
Anand Mandalika.

Getting cl_abap_structdescr for method parameters of LOCAL classes?

Hi guys
I have a bit of a of a problem with getting an instance of the cl_abap_structdescr class for a method parameter type of a local class. The RTTI structure abap_parmdescr can only be used to diffrentiate between the basic built-in ABAP types and whether types are structures, tables or references. The question now arrives that once you have diffentiated that the parameter is a structure how do you determine the actual structure TYPE name for local classes to create an instance of the cl_abap_structdescr to continue your run-time analysis. For dictionary classes the parameter type name can be retrieved from the seosubcodf table, to me it looks as if one would have to resort to scanning the source code of local classes to arrive at the actual structure type name, but before I go to THAT kind of trouble I was wondering whether somebody out there might have a better solution for me. Your help would be grreatly appreciated and rewarded ;).
Kind regards
Ettienne Hugo

Hello Uwe
Thanks for your reply, I checked out the CL_OO_LOCAL_CLASSES class, unfortunately the class actually operates on the local classes declared for a dictionary class. I think to clarify my question I should point out that the parameters I'm trying to process are parameters that belong to classes that are defined and implemented using include programs, these include programs would then typically be used in Function Groups to construct applications so the classes that I refer to are actually not in any way related to dictionary classes. The cl_abap_classdescr class works fine on these types of classes when you refer to them using the "\PROGRAM=my_program\CLASS=my_class" format with the describe_by_name method, unfortunately the class just does not provide sufficient information for structure type parameters to actually construct them during run-time...
Stay well
Ettienne

Local Class Transaction Code Problem

Hi friends,
        I have created report program using local class. I have also used selection screen to get input from user. I have created oops transaction code (using se93) for that program.
Problem is selection screen is not displayed when program is executed using tcode.
I think logically it not possibel to display the selection screen. Is it true?. OR
What Should I do?.
Next Question is, I have also created global class from my report program. But i cant able to find my class in se24.
I have done following things.
1) imported a local class from my report prg. ( In pop up screen that class icon(circle shaped icon) shown in gray colour)
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3) Selected overwrite existing class checkbok.
4) selected import icon.
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Hi senthil kumar ,
u can display the selection screen and secondly try to create your report in module pool type,
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let me know...
thanks
ravi

Policy regarding creating global or local classes?

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