CLASS {{p}}volume_discount DEFINITION PUBLIC FINAL CREATE PUBLIC.
  PUBLIC SECTION.
    INTERFACES {{p}}if_discount.

  PRIVATE SECTION.
    CONSTANTS:
      c_max_discount  TYPE {{p}}if_discount=>ty_percent VALUE '12.00',
      c_key_discount  TYPE {{p}}if_discount=>ty_percent VALUE '6.00',
      c_mid_discount  TYPE {{p}}if_discount=>ty_percent VALUE '3.00',
      c_high_discount TYPE {{p}}if_discount=>ty_percent VALUE '7.00',
      c_no_discount   TYPE {{p}}if_discount=>ty_percent VALUE '0.00',
      c_mid_limit     TYPE i VALUE 100,
      c_high_limit    TYPE i VALUE 500.

    METHODS customer_discount
      IMPORTING iv_group          TYPE {{p}}if_discount=>ty_group
      RETURNING VALUE(rv_percent) TYPE {{p}}if_discount=>ty_percent.

    METHODS volume_discount
      IMPORTING iv_quantity       TYPE i
      RETURNING VALUE(rv_percent) TYPE {{p}}if_discount=>ty_percent.
ENDCLASS.


CLASS {{p}}volume_discount IMPLEMENTATION.
  METHOD {{p}}if_discount~calculate.
    rv_percent = customer_discount( iv_group ) + volume_discount( iv_quantity ).
    IF rv_percent > c_max_discount.
      rv_percent = c_max_discount.
    ENDIF.
  ENDMETHOD.

  METHOD customer_discount.
    IF iv_group = {{p}}if_discount=>c_group_key.
      rv_percent = c_key_discount.
    ELSE.
      rv_percent = c_no_discount.
    ENDIF.
  ENDMETHOD.

  METHOD volume_discount.
    IF iv_quantity < c_mid_limit.
      rv_percent = c_no_discount.
    ELSEIF iv_quantity < c_high_limit.
      rv_percent = c_mid_discount.
    ELSE.
      rv_percent = c_high_discount.
    ENDIF.
  ENDMETHOD.
ENDCLASS.