Use of export and import in oo abap

Question

Hello experts,
We are new to oo abap and using process controlled workflow for BRF.
There are 3 methods which we are using. /SAPSRM/IF_EX_WF_RESP_RESOLVERGET_AREA_TO_ITEM_MAP, /SAPSRM/IF_WF_AREAGET_RESPONSIBLE_APPROVERS and /SAPSRM/IF_EX_WF_RESP_RESOLVER~GET_APPROVERS_BY_AREA_GUID.
In a situation we want to use document_id which is created in item_map into get_responsible_approvers method.
Therefore, we used export and import in these two methods like the following.
zgc_mock_pdo_guid =  is_document-document_guid. "uncomment later
    export zgc_mock_pdo_guid from zgc_mock_pdo_guid to memory id 'Z_MOCK_PDO_GUID' . "uncomment later
and
import zgc_mock_pdo_guid  = zgc_mock_pdo_guid  from  memory id 'Z_MOCK_PDO_GUID' . "uncomment this later
               CALL METHOD /SAPSRM/CL_WF_APV_FACADE=>RETRIEVE_PROCESS_HISTORY
                 EXPORTING
                   IV_DOCUMENT_GUID = zgc_mock_pdo_guid "ins_guid
                   IV_AGENT_ID      = lv_agent
                   IV_LANGUAGE      = sy-langu
                 IMPORTING
                   ES_PROCESS       = ls_process
Now we are getting the results as per our requirements. But I want to know whether or not it is supposed to be used in oo abap context or not otherwise I will find another method to do so. Please advise/suggest about the same.
Thank you.

Answer 1

Hello Keshav, Suhas.
Thank you vary much for your reply. I was definitely a great help to understand the concept.
This ZGC_MOCK_PDO_GUID attribute was already made private. Instead of defining under public section I defined it under attributes tab.
Thank you for your help though.
Right now I am trying to explore another way to do so.
I am trying to get factory instance for tack container using /SAPSRM/IF_CLL_TASKCON_FACTORY interface with method GET_INSTANCE from class /SAPSRM/CL_CH_WD_TASKCONT_FACT.
Later I am trying to get task container from this interface. Then after I am interested to get SC GUID using GET_BO_GUID method.
I have been trying to achieve this in following way. But somehow i am getting this GUID empty.
data :
temp_task_container_factory type REF TO /SAPSRM/IF_CLL_TASKCON_FACTORY,
temp_instance type REF TO /SAPSRM/IF_PDO_BO_SC_ADV,
ins_guid type BBP_GUID, "/SAPSRM/WF_DOCUMENT_GUID,
ls_process_info TYPE /SAPSRM/S_PDO_WF_PROCESS_INFO,
temp_handler TYPE REF TO /SAPSRM/IF_PDO_STATIC_META,
temp_task_container type REF TO /SAPSRM/IF_CLL_TASK_CONTAINER,
lo_task TYPE REF TO /SAPSRM/IF_CLL_TASKCON_FACTORY.
CALL METHOD /SAPSRM/CL_CH_WD_TASKCONT_FACT=>GET_INSTANCE
RECEIVING
RO_TASK_CONTAINER_FACTORY = temp_task_container_factory "
CALL METHOD TEMP_TASK_CONTAINER_FACTORY->GET_TASK_CONTAINER
* EXPORTING
* IV_TRANS_MODE =
* IO_MESSAGE_HANDLER =
* IV_BO_TYPE =
RECEIVING
RO_TASK_CONTAINER = temp_task_container
CALL METHOD TEMP_TASK_CONTAINER->GET_BO_GUID
RECEIVING
RV_BO_GUID = ins_guid .
TRY.
CALL METHOD /SAPSRM/CL_PDO_FACTORY_SC_ADV=>GET_BUFFERED_INSTANCE
EXPORTING
IV_HEADER_GUID = ins_guid
RECEIVING
RO_INSTANCE = temp_instance
ENDTRY.
CALL METHOD ZCL_WF_APV_FACADE=>RETRIEVE_PROCESS_HISTORY
EXPORTING
IV_DOCUMENT_GUID = ins_guid " we are passing ins_guid instead of zGC_MOCK_PDO_GUID this should have area_guid now.
IV_AGENT_ID = lv_agent
IV_LANGUAGE = sy-langu
IMPORTING
ES_PROCESS = ls_process.
But the ins_guid ( returned by RV_BO_GUID ) is empty ( The Bold fonted line of code)
I want to know whether I am doing this instantiation correctly or not or do I have to create class and object here only ?
Right now I am calling the class, getting get_instance and using its instance temp_task_container_factory i am calling interface /SAPSRM/IF_CLL_TASKCON_FACTORY. Is it correct way? PLease advise. Thank you once again.
Edited by: abhijitkamatkar on Feb 7, 2012 1:38 PM