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zdp_chainofresp.abap
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*&---------------------------------------------------------------------*
*& Report ZDP_CHAINOFRESP
*&
*&---------------------------------------------------------------------*
*&
*&
*&---------------------------------------------------------------------*
REPORT zdp_chainofresp.
CLASS cl_abap_typedescr DEFINITION LOAD.
DATA: moff TYPE I
, slen TYPE I
, mlen TYPE I.
DEFINE get_clazz_name.
&2 = cl_abap_classdescr=>get_class_name( &1 ).
FIND REGEX 'CLASS=' IN &2 MATCH OFFSET moff match LENGTH mlen.
slen = moff + mlen.
SHIFT &2 BY slen PLACES LEFT.
END-OF-DEFINITION.
CLASS HANDLER DEFINITION ABSTRACT.
PUBLIC SECTION.
METHODS:
set_successor IMPORTING io_successor TYPE REF TO HANDLER
, handle_request ABSTRACT IMPORTING iv_request TYPE I.
PROTECTED SECTION.
DATA:
successor TYPE REF TO HANDLER.
ENDCLASS.
CLASS HANDLER IMPLEMENTATION.
METHOD set_successor.
me->successor = io_successor.
ENDMETHOD.
ENDCLASS.
CLASS concrete_handler1 DEFINITION INHERITING FROM HANDLER.
PUBLIC SECTION.
METHODS:
handle_request REDEFINITION.
ENDCLASS.
CLASS concrete_handler1 IMPLEMENTATION.
METHOD handle_request.
DATA: class_name TYPE abap_abstypename.
get_clazz_name me class_name.
IF ( iv_request >= 0 AND iv_request < 10 ).
WRITE: / class_name, 'Handled request', iv_request.
ELSEIF ( NOT successor IS INITIAL ).
me->successor->handle_request( iv_request ).
ENDIF.
ENDMETHOD.
ENDCLASS.
CLASS concrete_handler2 DEFINITION INHERITING FROM HANDLER.
PUBLIC SECTION.
METHODS:
handle_request REDEFINITION.
ENDCLASS.
CLASS concrete_handler2 IMPLEMENTATION.
METHOD handle_request.
DATA: class_name TYPE abap_abstypename.
get_clazz_name me class_name.
IF ( iv_request >= 10 AND iv_request < 20 ).
WRITE: / class_name, 'Handled request', iv_request.
ELSEIF ( NOT successor IS INITIAL ).
me->successor->handle_request( iv_request ).
ENDIF.
ENDMETHOD. "handlerequest
ENDCLASS.
CLASS concrete_handler3 DEFINITION INHERITING FROM HANDLER.
PUBLIC SECTION.
METHODS:
handle_request REDEFINITION.
ENDCLASS.
CLASS concrete_handler3 IMPLEMENTATION.
METHOD handle_request.
DATA: class_name TYPE abap_abstypename.
get_clazz_name me class_name.
IF ( iv_request >= 20 AND iv_request < 30 ).
WRITE: / class_name, 'Handled request', iv_request.
ELSEIF ( NOT successor IS INITIAL ).
me->successor->handle_request( iv_request ).
ENDIF.
ENDMETHOD. "handlerequest
ENDCLASS.
CLASS lcl_application DEFINITION CREATE PRIVATE.
PUBLIC SECTION.
CLASS-METHODS: RUN.
METHODS: constructor.
PRIVATE SECTION.
CLASS-DATA: so_application TYPE REF TO lcl_application.
ENDCLASS.
CLASS lcl_application IMPLEMENTATION.
*----------------------------------------------------------
* LCL_APPLICATION->RUN().
*----------------------------------------------------------
METHOD RUN.
DATA:
exc_ref TYPE REF TO cx_root
,exc_text TYPE string.
IF lcl_application=>so_application IS INITIAL.
TRY.
CREATE OBJECT lcl_application=>so_application.
CATCH cx_sy_create_object_error INTO exc_ref.
exc_text = exc_ref->get_text( ).
MESSAGE exc_text TYPE 'I'.
ENDTRY.
ENDIF.
ENDMETHOD.
METHOD constructor.
DATA:
h1 TYPE REF TO concrete_handler1
,h2 TYPE REF TO concrete_handler2
,h3 TYPE REF TO concrete_handler3
,t_request TYPE TABLE OF I
,request TYPE I
.
* create objects
CREATE OBJECT h1.
CREATE OBJECT h2.
CREATE OBJECT h3.
h1->set_successor( h2 ).
h2->set_successor( h3 ).
INSERT 2 INTO TABLE t_request.
INSERT 5 INTO TABLE t_request.
INSERT 14 INTO TABLE t_request.
INSERT 22 INTO TABLE t_request.
INSERT 18 INTO TABLE t_request.
INSERT 3 INTO TABLE t_request.
INSERT 27 INTO TABLE t_request.
INSERT 20 INTO TABLE t_request.
LOOP AT t_request INTO request.
h1->handle_request( request ).
ENDLOOP.
ENDMETHOD. "constructor
ENDCLASS.
START-OF-SELECTION.
lcl_application=>run( ).