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Docs: Expand constructor description (#4914)

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Describe logic to be used to check requirements and determine if an object type is supported or not.
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Marc Bernard 2021-08-28 01:39:28 -04:00 committed by GitHub
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docs/collections/_development/serializers.md
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@ -28,6 +28,31 @@ Parameter | Description
These parameters are stored in attributes `MS_ITEM` and `MV_LANGUAGE` respectively.
Requirements that are necessary to support an object type should be checked in the constructor using the following logic. This is typical if object types are not supported in lower releases.
```abap
METHOD constructor.
DATA ...
super->constructor(
is_item = is_item
iv_language = iv_language ).
TRY.
" Check requirements...
CATCH cx_root.
" Raise exception if not supported
zcx_abapgit_exception=>raise( 'Object type DDLS not supported' ).
ENDTRY.
ENDMETHOD.
```
This will ensure that none of the other class methods are called, even if objects of the given type exist in a repo.
Example: [`SRFC`](https://github.com/abapGit/abapGit/blob/main/src/objects/zcl_abapgit_object_srfc.clas.abap).
## Interface
Serializers must implement all methods of interface [`ZIF_ABAPGIT_OBJECT`](https://github.com/abapGit/abapGit/blob/main/src/objects/zif_abapgit_object.intf.abap):