topic Return a class instance from a static method? in Application Development and Automation Discussions

Return a class instance from a static method?

Former Member — Mon, 16 Mar 2015 17:18:52 GMT

Hi All,

I have a question about OOP Abap;

How can i write (best way) inner of ZCML_USER=>LOGIN method for using like at doLogin method.

(There is a c# example under the Abap codes )

Thanks.

ABAP USER CLASS


class ZCMCL_USER definition
   public
   final
   create public .

 public section.

   class-methods LOGIN
     importing
       value(USERNAME) type ZCM_DUS_USERNAME
       value(PASSWORD) type ZCM_DUS_PASSWORD
     returning
       value(STATUS) type ref to ZCMCL_USER .

ABAP - STATIC METHOD OF USER CLASS


method LOGIN.
   
   ????????
   
 endmethod.

ABAP - CALLING STATIC USER METHOD


method DOLOGIN.
   DATA theUser  TYPE REF TO ZCMCL_USER.
   theUser = ZCMCL_USER=>LOGIN( USERNAME = 'kdr'  password = '123' ).
   endmethod.

C# EXAMPLE

C# - USER CLASS


    public class User
    {
        public int Id { get; set; }
        public string Name { get; set; }
        public string Surname { get; set; }


        public static User Login(string username, string password)
        {
            //if.....
            User usr = new User();
            usr.Name = "Ahmet";
            usr.Surname = "AKIN";
            usr.Id = 1;


            return usr;
        }
    }

C# - CALLING STATIC USER METHOD


    public void doLogin()
    {
        User theUser = User.Login("ahmt", "123456");
        Console.WriteLine(theUser.Name);
    }

Re: Return a class instance from a static method?

SharathYaralkattimath — Tue, 17 Mar 2015 05:08:18 GMT

ABAP USER CLASS

class ZCMCL_USER definition
public
final
create public .
public section.
METHODS CONSTRUCTOR importing
value(USERNAME) type ZCM_DUS_USERNAME
value(PASSWORD) type ZCM_DUS_PASSWORD.
class-methods LOGIN
importing
value(USERNAME) type ZCM_DUS_USERNAME
value(PASSWORD) type ZCM_DUS_PASSWORD
returning
value(STATUS) type ref to ZCMCL_USER .

ABAP - STATIC METHOD OF USER CLASS

method LOGIN.
CREATE OBJECT status
EXPORTING
username = username
password = password.
endmethod.
method CONSTRCUTOR.
"Copy the importing parameters to Class variables so that it could be used in other methods
ENDMETHOD.

Thanks,

Sharath

Re: Return a class instance from a static method?

indra_dewaji — Wed, 18 Mar 2015 03:40:56 GMT

Hi Abdulkadir,

I believe you want to create a singleton class which can be accessible for all other places during runtime.

First you can create a singleton class. Here the sample code:

class yide_cl_fpm_singleton definition

public

final

create public .

public section.

data:

username type sy-uname.

class-methods get_instance

returning

value(re_instance) type ref to yide_cl_fpm_singleton .

protected section.

private section.

class-data mo_instance type ref to yide_cl_fpm_singleton .

endclass.

private section.

class-data mo_instance type ref to yide_cl_gaf_singleton .

method get_instance.

   if mo_instance is initial.
     create object mo_instance.
   endif.

   re_instance = mo_instance.

endmethod.

And then, in your program, you can call this singleton class by calling as static method get_instance. Once your instance has been instantiated, you can access your public data from this class. You can get or set via this singleton class.

Hope it's fit to your requirement.

Regards,

Indra