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如何使用 ABAP Function Module SEO_CLASS_CREATE_COMPLETE 创建 ABAP class

发布时间 2023-08-24 22:54:50作者: JerryWang_汪子熙

SEO_CLASS_CREATE_COMPLETE函数模块用于在SAP系统中创建一个完整的SAP类。在SAP ABAP中，类是面向对象编程的基本构建块，它允许开发者将数据和行为组织到一个单一的实体中。SAP的类通常用于描述业务对象、数据结构和业务逻辑，以实现灵活性和可维护性。

SEO_CLASS_CREATE_COMPLETE函数模块的主要用途包括：

  1. 创建类： 通过SEO_CLASS_CREATE_COMPLETE，开发者可以在SAP系统中创建一个新的ABAP类。这个类可以是一个普通的类，也可以是一个异常类、单例类或接口类。

  2. 定义属性和方法： 在创建类时，可以使用该函数模块来定义类的属性（成员变量）和方法。属性可以是公共的、受保护的或私有的，方法可以是实例方法或类方法。

  3. 处理事件： 除了属性和方法，SAP ABAP类还可以处理事件。通过SEO_CLASS_CREATE_COMPLETE，可以为类添加事件处理程序，以响应特定的事件。

  4. 实现接口： 如果一个类需要实现一个或多个接口，SEO_CLASS_CREATE_COMPLETE也可以用于为类添加接口的实现。

  5. 定义继承关系： SAP ABAP支持继承关系，允许一个类继承另一个类的属性和方法。通过SEO_CLASS_CREATE_COMPLETE，可以定义类之间的继承关系。

本文介绍使用下列 ABAP Function Module 生成新的 ABAP 类的方法。

SEO_CLASS_CREATE_COMPLETE

REPORT zdyanmic.
DATA ls_vseoclass      TYPE vseoclass.
DATA ls_imp_if         TYPE seor_implementing_r.
DATA lt_imp_if         TYPE seor_implementings_r.
DATA ls_imp_det        TYPE seoredef.
DATA lt_methods_source TYPE seo_method_source_table.
DATA ls_method_source  TYPE seo_method_source.
DATA lv_method         TYPE LINE OF seoo_methods_r.

DATA: lv_classname LIKE ls_vseoclass-clsname VALUE 'ZCLJERRY8'.

ls_vseoclass-clsname   = lv_classname.
ls_vseoclass-state     = seoc_state_implemented.
ls_vseoclass-exposure  = seoc_exposure_public.
ls_vseoclass-descript  = `Dynamic proxy generated by Jerry's code`.
ls_vseoclass-langu     = sy-langu.
ls_vseoclass-clsccincl = abap_true.
ls_vseoclass-unicode   = abap_true.
ls_vseoclass-fixpt     = abap_true.
ls_vseoclass-clsfinal  = abap_true.

ls_imp_det = ls_imp_if-clsname       = lv_classname.
ls_imp_det = ls_imp_if-refclsname    = 'IF_HELLOWORLD'.
ls_imp_if-state      = seoc_state_implemented.
APPEND ls_imp_if TO lt_imp_if.

CLEAR: ls_method_source.
DATA: lv_name TYPE string.
ls_method_source-cpdname = 'IF_HELLOWORLD~PRINT'.
APPEND ` WRITE:/ 'before Hello World'.` TO ls_method_source-source.
APPEND '  mo_origin->print( ).'       TO ls_method_source-source.
APPEND ` WRITE:/ 'after Hello World'.` TO ls_method_source-source.

APPEND ls_method_source TO lt_methods_source.

CLEAR: ls_method_source.
ls_method_source-cpdname = 'CONSTRUCTOR'.
APPEND 'mo_origin = io_origin.' TO ls_method_source-source.
APPEND ls_method_source TO lt_methods_source.

DATA:
  lt_implementation TYPE seop_source_string,
  ls_mtdkey         TYPE seocpdkey,
  cv_implementation TYPE seor_implementings_r,
  ls_source_code    TYPE seo_method_source,
  lt_methods        TYPE seoo_methods_r,
  lt_parameters     TYPE seos_parameters_r,
  lt_attribute      TYPE seoo_attributes_r,
  ls_attribute      LIKE LINE OF lt_attribute,
  ls_parameter      LIKE LINE OF lt_parameters,
  ls_method         LIKE LINE OF lt_methods.

ls_method-clsname = lv_classname.
ls_method-cmpname = 'CONSTRUCTOR'.
ls_method-state = 1. "implemented
ls_method-exposure = 2. "public
APPEND ls_method TO lt_methods.

ls_parameter-clsname = lv_classname.
ls_parameter-cmpname = 'CONSTRUCTOR'.
ls_parameter-version = 1.
ls_parameter-descript = 'Jerry'.
ls_parameter-type = 'IF_HELLOWORLD'.
ls_parameter-sconame = 'IO_ORIGIN'.
ls_parameter-cmptype = 1. "METHOD
ls_parameter-mtdtype = 0. "METHOD
ls_parameter-pardecltyp = 0. "IMPORTING
ls_parameter-parpasstyp = 1. "pass by reference
ls_parameter-typtype = 3. "type ref to
APPEND ls_parameter TO lt_parameters.

ls_attribute-clsname = lv_classname.
ls_attribute-cmpname = 'MO_ORIGIN'.
ls_attribute-state = 1.
ls_attribute-attdecltyp = 0.
ls_attribute-attexpvirt = 0. "private
ls_attribute-typtype = 3. "type ref to
ls_attribute-type = 'IF_HELLOWORLD'.
APPEND ls_attribute TO lt_attribute.

CALL FUNCTION 'SEO_CLASS_CREATE_COMPLETE'
  EXPORTING
    devclass                   = '$TMP'
    version                    = seoc_version_active
    authority_check            = abap_true
    overwrite                  = abap_true
    suppress_method_generation = abap_false
    genflag                    = abap_false
    method_sources             = lt_methods_source
    suppress_dialog            = abap_true
  CHANGING
    class                      = ls_vseoclass
    methods                    = lt_methods
    parameters                 = lt_parameters
    implementings              = lt_imp_if
    attributes                 = lt_attribute
  EXCEPTIONS
    existing                   = 1
    is_interface               = 2
    db_error                   = 3
    component_error            = 4
    no_access                  = 5
    other                      = 6
    OTHERS                     = 7.

WRITE: / sy-subrc.