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ABAP Keyword Documentation →  ABAP - Reference →  Enhancements →  Enhancements Using BAdIs 

GET BADI

Short Reference

Other versions: 7.31 | 7.40 | 7.54

Syntax


GET BADI { badi [FILTERS f1 = x1 f2 = x2 ...] } 
       | { badi TYPE (name) 

              [ {FILTERS f1 = x1 f2 = x2 ...} 

              | {FILTER-TABLE ftab}] } 

              [CONTEXT con].

Extras

1. ... FILTERS f1 = x1 f2 = x2 ...

2. ... FILTER-TABLE ftab
3. ... CONTEXT con

Effect

This statement generates a new BAdI object and sets the BAdI reference to the object in a BAdI reference variable badi. This statement has a static and a dynamic variant.

  • In the case of the static variant, addition TYPE is not declared. The static type of the reference variable badi must be a BAdI. This determines which BAdI will be used.
  • In the case of the dynamic variant, a character-like data object name is declared for addition TYPE. When the statement is executed, this object must contain the name of a BAdI. The static type of the reference variable badi must be a superclass for all CL_BADI_BASE BAdI classes.

To declare values for the BAdI's filters, you can declare the addition FILTERS in the static variant, or addition FILTER-TABLE in the dynamic variant.

In the case of a context-free BAdI, addition CONTEXT cannot be declared. In the case of a context-specific BAdI, however, it must be declared.

After instancing, the program searches for BAdI implementation classes for the BAdI as follows:

  • Only BAdI implementation classes are selected that are assigned to a BAdI implementation that has the status active.

  • Only BAdI implementation classes are selected that are assigned to a BAdI implementation (an enhancement) that have a switch in the status on. If no switch is assigned to a BAdI implementation, it is treated in the same way as an implementation with a switch in the status on.

  • All BAdI implementations are selected that satisfy the above requirements and for which the filter condition of the BAdI implementation matches the values declared after FILTERS or in ftab. If no BAdI implementations are found with the filter specifications, the system searches for BAdI implementations that are marked as standard implementations. If there are also none of these, the fallback BAdI implementation class of the BAdI is used (if one exists).

  • If, for a BAdI defined for single use, multiple BAdI implementation classes with matching filter conditions have been found, then a conflict solution is carried out. A successful conflict solution results in exactly one priority conflict-solving enhancement implementation and only its BAdI implementation class is selected. If several conflict-solving enhancement implementations have the same priority or if there are no conflict-solving enhancement implementations at all, then a correct conflict solution is not possible and several BAdI implementation classes will remain in the hit list.

    • If the resulting hit list is suitable for the definition of the BAdI which means:

    • For a BAdI defined for a single use, the hit list must contain exactly one BAdI implementation class,
    • For a BAdI defined for multiple use, the hit list may contain several or no BAdI implementation classes,

    then references to object plug-ins of the found BAdI implementations are saved in the BAdI object. Object plug-ins that do not yet exist are generated for this purpose. Whether an existing object plug-in is generated or reused, or whether a new object plug-in is generated, depends on whether the BAdI is context-free or context-dependent, and depends on the CONTEXT addition. The precise semantics are described in the addition.

    If the hit list contains no or multiple BAdI implementations although the BAdI is defined for single use, an exception occurs. If the BAdI reference variable badi is given a valid BAdI reference before the statement in an exception case, this is retained, otherwise it is initialized.


    Notes

    • It is not possible to access BAdI objects directly using BAdI references. The references are only used to call the BAdI methods in the referenced object plug-ins with the statement CALL BADI. Otherwise, BAdI reference variables can be used in the same operand positions as normal object reference variables. In particular, this means that assignments and comparisons are possible.
    • The method NUMBER_OF_IMPLEMENTATIONS of the class CL_BADI_QUERY returns the number of BAdI implementations that are saved in a BAdI object.
    • The statement GET BADI prepares an enhancement spot invocation, and can therefore be seen as part of an explicit enhancement option in the terminology of the enhancement concept.
    • To prevent the exception for BAdIs that are defined for single use in systems in which no corresponding enhancement is carried out, it is recommended to specify a fallback BAdI implementation class for these BAdIs. The fallback BAdI implementation class belongs to the BAdI and is independent of enhancements.
    • To access object plug-ins directly requires the corresponding references. These can be supplied, for example, by BAdI methods.
    • The BAdI reference cannot be used to handle any instance events of a BAdI. Instead, when the event handler is registered, either the addition FOR ALL INSTANCES must be specified using SET HANDLER, or an reference to an object plug-in must be entered directly.

    Addition 1

    ... FILTERS f1 = x1 f2 = x2 ...

    Effect

    After addition FILTERS, the elementary data objects x1, x2, ... must be declared for all f1, f2, ... filters of the BAdI. If a filter in the BAdI has the property Constant Filter Value at Call, only literals and constants can be declared. The data objects must be compatible with the data type of the filters. FILTERS cannot be declared for a BAdI without filters.

    Addition 2

    ... FILTER-TABLE ftab

    Effect

    Using the special internal table ftab, this addition assigns values to the filters of a dynamically declared BAdI. The internal table must have table type BADI_FILTER_BINDINGS from ABAP Dictionary. When statement GET BADI is executed, the table must contain exactly one row for each of the BAdI's filters. The table columns are:

    • NAME of type c and length 30
      for the name of the filter in uppercase letters. Declaring a nonexistent filter raises a non-handleable exception.
    • VALUE of type REF TO data
      A reference to a matching data object. The value of the data object that the reference variable in VALUE refers to is assigned to the filter declared in NAME.

    The column NAME is the unique key of the sorted table ftab.

    Addition 3

    ... CONTEXT con

    Effect

    Using the addition CONTEXT, for context-dependent BAdIs, an object reference variable con must be specified, the static type of which is, or includes, the tag interface IF_BADI_CONTEXT, and which contains a reference to a BAdI context object. If con is initial, an exception is raised. The addition CONTEXT cannot be entered for context-free BAdIs.

    The addition CONTEXT controls the generation of the object plug-ins as follows:

    • Without the addition CONTEXT, hence for context-free BAdIs, the generation of the object plug-ins is based on the setting of the BAdI. Either new plug-ins are generated every time the statement GET BADI is executed, or an object plug-in that has already been generated in the current internal session is reused, if it is required again. An object plug-in of this type is a singleton in terms of its BAdI implementation class.
    • With the addition CONTEXT, and hence for context-dependent BAdIs, the same object plug-ins are always used for the same content of con. These object plug-ins are singletons in terms of their BAdI implementation class and a BAdI context object.

    If a BAdI implementation class implements multiple BAdI interfaces and GET BADI is executed within one internal session for several of these BAdIs, then multiple BAdI objects can point to the same object plug-in. This enables the sharing of data between different BAdIs. For context-free BAdIs, this is only the case for reuse. For context-dependent BAdIs, multiple BAdI objects from the same context can point to the same object plug-ins.


    Notes

    • The fact that object plug-ins can either be newly generated or reused can also be expressed in terms of an object plug-in being stateful or stateless with reference to a BAdI or a context.
    • The tag interface IF_BADI_CONTEXT can be implemented by any class. Possible applications range from the implementation in a local class without other components that have the sole purpose of enabling internal program context administration for BAdIs, to the implementation in a global application class in which the objects are specifically enhanced.

    Exceptions


    Catchable Exceptions

    CX_BADI_CONTEXT_ERROR

    • Cause: A context error has occurred in the dynamic variant of the statement.

    CX_BADI_FILTER_ERROR

    • Cause: Incorrect information was specified regarding the BAdI's filters in the dynamic variant of the statement.

    CX_BADI_INITIAL_CONTEXT

    • Cause: The reference variable declared after CONTEXT is initial.

    CX_BADI_MULTIPLY_IMPLEMENTED

    • Cause: Multiple BAdI implementation classes were found, although the BAdI is defined for single use. Subclass of CX_BADI_NOT_SINGLE_USE.

    CX_BADI_NOT_IMPLEMENTED

    • Cause: No BAdI implementation class was found, although the BAdI is defined for single use. Subclass of CX_BADI_NOT_SINGLE_USE.

    CX_BADI_UNKNOWN_ERROR

    • Cause: The BAdI declared in the dynamic variant does not exist.