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ABAP Keyword Documentation →  ABAP - Release-Specific Changes →  Changes in Releases 6.xx →  Changes in Release 6.40 

Runtime Type Services in Release 6.40

The runtime type services (RTTS) are a further development of the former runtime type identification (RTTI). With the enhancement of the type description classes to include methods for creating dynamic types (see modification 1), the RTTS include (from Release 6.40) the RTTI and also runtime type creation (RTTC).


1. Methods for creating data types

2. New methods for types from ABAP Dictionary

3. Enhancement of the method GET_COMPONENT_TYPE

4. Enhancement of the method GET_PROPERTY

5. New method HAS_PROPERTY

6. New method GET_CLASS_NAME


7. New method GET_DATA_TYPE_KIND

Other versions: 7.31 | 7.40 | 7.54

Modification 1

Methods for Creating Data Types

The type description classes of RTTI were enhanced using RTTC methods. These methods create type description objects independently of existing types. This means what was previously RTTI becomes the RTTS.

Together with the addition HANDLE of the statements CREATE DATA and ASSIGN, the RTTC-specific methods of the RTTS allow the construction of data objects of any types for the program runtime and the casting of dynamic types.

The most important new methods for dynamically defining data types are:

  • GET_C, GET_D, GET_F, and so on of class CL_ABAP_ELEMDESCR for creating type description objects for elementary data types.
  • CREATE of class CL_ABAP_STRUCTDESCR for creating type description objects for structured data types based on a component table.
  • CREATE of class CL_ABAP_TABLEDESCR for creating type description objects for table types, where the attributes of the table are passed to the input parameters.
  • CREATE of class CL_ABAP_REFDESCR for creating type description objects for reference types, where the static type is passed to an input parameter.

Modification 2

New Methods for Types from ABAP Dictionary

If the type of a type description object comes from ABAP Dictionary, the dictionary attributes of the type can be identified using the following methods:

For any data types

  • CL_ABAP_TYPEDESCR=>IS_DDIC_TYPE
    returns ABAP_TRUE when the object describes a type from ABAP Dictionary
  • CL_ABAP_TYPEDESCR=>ABSOLUTE_NAME
    returns the absolute name of a type (also for program-defined types)
  • CL_ABAP_TYPEDESCR=>GET_DDIC_HEADER
    returns the nametab header of a type from ABAP Dictionary
  • CL_ABAP_TYPEDESCR=>GET_DDIC_OBJECT
    returns the nametab field descriptions of a type from ABAP Dictionary

For elementary data types

  • CL_ABAP_ELEMDESCR=>GET_DDIC_FIELD
    returns the attributes of the data element and its texts (replaces function module DDIF_FIELDINFO_GET)
  • CL_ABAP_ELEMDESCR=>GET_DDIC_FIXED_VALUES
    returns the fixed values of the data element

For structures and database tables

  • CL_ABAP_STRUCTDESCR=>GET_DDIC_FIELD_LIST
    returns the features of the structure and its texts (replaces function module DDIF_FIELDINFO_GET)

Modification 3

Enhancement of the Method GET_COMPONENT_TYPE

Previously, the method GET_COMPONENT_TYPE of class CL_ABAP_STRUCTDESCR for parameter P_NAME only accepted actual parameters of types string and c. Although the formal parameter is type any, during the call, a type check was executed that caused a serious error for non-text-like actual parameters. Actual parameters of type csequence and numeric are now accepted. A text-like parameter is interpreted as a component name, a numeric parameter as the position of the component in the structure. An actual parameter that does not apply to csequence or numeric triggers the non-class-based exception UNSUPPORTED_INPUT_TYPE.

Modification 4

Enhancement of the Method GET_PROPERTY

A new public constant CL_ABAP_TYPEDESCR=>TYPEPROPKIND_HASCLIENT has been introduced. If this constant of method GET_PROPERTY is passed to class CL_ABAP_TYPEDESCR, the system checks whether the type of the type description object has a client field. A reference to a data object of type ABAP_BOOL is always returned. If the type has a client field, the referenced data object has the value of the constant ABAP_TRUE. If the type does not have a client field or if it does not affect a structure, the referenced data object has the value of the constant ABAP_FALSE .

Modification 5

New Method HAS_PROPERTY

A new public method HAS_PROPERTY has been introduced in class CL_ABAP_TYPEDESCR. Unlike GET_PROPERTY, this method only identifies whether a type has a property and only returns the values from ABAP_TRUE or ABAP_FALSE.

Modification 6

New Method GET_CLASS_NAME

A new public method GET_CLASS_NAME has been introduced in class CL_ABAP_CLASSDESCR. This method returns the name of the class of an object.

Modification 7

New Method GET_DATA_TYPE_KIND

A new public method GET_DATA_TYPE_KIND has been introduced in class CL_ABAP_DATADESCR. This method returns the same values as the statement DESCRIBE FIELD with the addition TYPE. These values are also defined as constants with the prefix TYPE_KIND_ of class CL_ABAP_DATADESCR.