Avoid Concrete Class References in Interfaces

WarningClean ABAP & Modern Syntax#EC NO_INTF_CLASS_REFLocal Only

Overview

Interfaces should not reference concrete classes.

ATC Finding Message: Interface references concrete class; use an interface reference instead

Rationale

Interfaces should adhere to the Dependency Inversion Principle and not couple directly to concrete class implementations. Use interface references instead.

Non-Compliant

INTERFACE lif_demo.
  DATA mo_obj TYPE REF TO cl_concrete.
ENDINTERFACE.

Compliant

INTERFACE lif_demo.
  DATA mo_obj TYPE REF TO if_contract.
ENDINTERFACE.

Suppression

To suppress findings for this rule, append the pseudo-comment to the statement:

" Standard pseudo-comment:
... "#EC NO_INTF_CLASS_REF

" SAP CI_ prefix format:
... "#EC CI_NO_INTF_CLASS_REF

Related Rules

• Prefer Interface Segregation (Small, Focused Interfaces) — #EC PREF_INTF_SEGREG
• Avoid Exposed Mutable Data in Classes and Interfaces — #EC PUBLIC_ATTR

Technical Details

• Native ATC Class: ZCL_SKYLINT_NO_INTF_CLASS_REF
• Implementation File: zcl_skylint_no_intf_class_ref.clas.abap