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INTERFACE - components

The following declaration statements are possible in interfaces for components:

• TYPES, DATA, CLASS-DATA, and CONSTANTS for data types and data objects

• METHODS, CLASS-METHODS, EVENTS, and CLASS-EVENTS for methods and events

• INTERFACES for the inclusion of component interfaces and ALIASES for alias names for components of interfaces

The only interface components that can be addressed without implementation of the interface in classes are data types and constants. The latter can be addressed using the name of the interface and the class component selector (=>).

Other versions: 7.31 | 7.40 | 7.54

Notes

• All components of an interfaces are in one namespace. Within an interface, the name of a component must be unique, regardless of its type (data type, attribute, method, event, or alias name). The components of an included interface are identified by the prefix intf~ (name of the interface with interface component selector).

• Interfaces provide fewer variants than classes for declarations of methods using METHODS and CLASS-METHODS. More specifically, no constructors, test methods, or AMDP function implementations can be declared in interfaces for CDS table functions.

Example

Declaration of various components in an interface.

INTERFACE intf1.
  ...
ENDINTERFACE.

INTERFACE intf2.
    INTERFACES intf1.
    TYPES:
      type ...
    DATA:
      attr TYPE ...
    CLASS-METHODS:
      factory RETURNING VALUE(ref) TYPE REF TO intf2.
    METHODS:
      meth ...
ENDINTERFACE.