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Enumerated Objects, Use

This example demonstrates the use of enumerated types.

Other versions: 7.31 | 7.40 | 7.54

Source Code

    DATA: size   TYPE  cl_demo_wrap_browser=>size
                 VALUE cl_demo_wrap_browser=>sz-l,
          format TYPE  cl_demo_wrap_browser=>format
                 VALUE cl_demo_wrap_browser=>fmt-l.

    cl_demo_input=>add_field( EXPORTING text = `Size (S, M, L, XL)`
                              CHANGING  field = size ).
    cl_demo_input=>request(   EXPORTING text  = `Format (L, P)`
                             CHANGING  field = format ).

    cl_demo_wrap_browser=>show( html   = html
                                size   = size
                                format = format ).

Description

The program calls the method SHOW of class CL_DEMO_WRAP_BROWSER . Two enumerated types are defined as follows in this class:

TYPES:
  BEGIN OF ENUM size STRUCTURE sz,
    s, m, l, xl,
  END OF ENUM size STRUCTURE sz.
TYPES:
  BEGIN OF ENUM format STRUCTURE fmt,
    l, p,
  END OF ENUM format STRUCTURE fmt.

The use of enumeration structures means that the same name l can occur twice. Method SHOW wraps method SHOW_HTML of class CL_ABAP_BROWSER:

METHOD show.
  cl_abap_browser=>show_html(
    html_string = html
    size    = SWITCH #(  size
                         WHEN sz-s  THEN cl_abap_browser=>small
                         WHEN sz-m  THEN cl_abap_browser=>medium
                         WHEN sz-l  THEN cl_abap_browser=>large
                         WHEN sz-xl THEN cl_abap_browser=>xlarge )
    format  = SWITCH #(  format
                         WHEN fmt-l THEN cl_abap_browser=>landscape
                         WHEN fmt-p THEN cl_abap_browser=>portrait )
    buttons = abap_true ).
ENDMETHOD.

The input parameters size and format format of the method have the same enumerated types and can only contain their enumerated values. These are mapped to the corresponding constants of class CL_ABAP_BROWSER. These constants can be regarded as a workaround for real enumerated types, which were not available when CL_ABAP_BROWSER was developed.

Enumerated values can be specified for the size and format when the program is executed. The values are passed internally to the program by deserializing the character-like values into the local enumerated variables size and format. The exception for invalid values is caught internally; here the enumerated variables are initialized, which corresponds to the values of the enumeration constants sz-s and fmt-l.