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danrega
2024-08-30 13:28:14 +02:00
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02_Structures.md
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@@ -777,6 +777,53 @@ you can ...
For more information, see the [Dynamic Programming](06_Dynamic_Programming.md) cheat sheet.
RTTI example:
```abap
TYPES: BEGIN OF demo_struc_type,
comp1 TYPE c LENGTH 3,
comp2 TYPE i,
comp3 TYPE string,
END OF demo_struc_type.
DATA demo_struc TYPE demo_struc_type.
DATA(tdo_c) = cl_abap_typedescr=>describe_by_data( demo_struc ).
"DATA(tdo_c) = cl_abap_typedescr=>describe_by_name( 'DEMO_STRUC_TYPE' ).
"Cast to get more specific information
DATA(tdo_struc) = CAST cl_abap_structdescr( cl_abap_typedescr=>describe_by_data( demo_struc ) ).
"DATA(tdo_struc) = CAST cl_abap_structdescr( tdo_c ).
DATA(type_category_struc) = tdo_struc->kind.
DATA(relative_name_struc) = tdo_struc->get_relative_name( ).
... "Explore more options by positioning the cursor behind -> and choosing CTRL + Space
DATA(type_of_struc) = tdo_struc->struct_kind.
DATA(struc_comps) = tdo_struc->components.
DATA(struc_comps_more_details) = tdo_struc->get_components( ).
DATA(struc_has_include) = tdo_struc->has_include.
DATA(struc_incl_view) = tdo_struc->get_included_view( ).
DATA(applies_to_data_struc) = tdo_struc->applies_to_data( `some string` ).
"Example: "Looping" across a structure
"Demo structure, all components are convertible to type string
TYPES: BEGIN OF ty_struc,
comp1 TYPE c LENGTH 3,
comp2 TYPE string,
comp3 TYPE i,
comp4 TYPE n LENGTH 4,
END OF ty_struc.
DATA(struct) = VALUE ty_struc( comp1 = 'abc' comp2 = `ABAP` comp3 = 123 comp4 = '9876' ).
DATA looped_struc TYPE string.
"In the loop, a string is populated, component by component.
LOOP AT CAST cl_abap_structdescr( cl_abap_typedescr=>describe_by_data( struct ) )->components INTO DATA(comp).
looped_struc = |{ looped_struc }{ COND #( WHEN sy-tabix <> 1 THEN ` / ` ) }Name: "{ CONV string( comp-name ) }", Value: "{ struct-(comp-name) }"|.
ENDLOOP.
"Result:
"Name: "COMP1", Value: "abc" / Name: "COMP2", Value: "ABAP" / Name: "COMP3", Value: "123" / Name: "COMP4", Value: "9876"
```
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