FUNCTION dependently_instantiated

(* SCHEMA Ap203_configuration_controlled_3d_design_of_mechanical_parts_and_assemblies_mim_lf; *)

FUNCTION dependently_instantiated
	(set_of_input_instances: SET [0:?] OF GENERIC: igen; set_of_input_types: SET [0:?] OF STRING; previous_in_chain: LIST [0:?] OF GENERIC: cgen) : BOOLEAN;
LOCAL
  number_of_input_instances     : INTEGER;
  number_of_referring_instances : INTEGER;
  bag_of_referring_instances    : BAG OF GENERIC:igen := [];
  dependently_instantiated_flag : BOOLEAN;
  previous_in_chain_plus        : LIST OF GENERIC:cgen := [];
  result                        : BOOLEAN := true;
  set_of_types                  : SET OF STRING := [];
END_LOCAL;

IF EXISTS(set_of_input_instances) THEN
  number_of_input_instances := SIZEOF(set_of_input_instances);
  (* Add the declared type of bag_of_referring_instances to the set of
     types of the REFERENCEd instances for the subset comparison later.
   *)
  set_of_input_types := set_of_input_types + 'GENERIC';
  REPEAT i:=1 TO number_of_input_instances;
    (* Determine all references to the current input instance. *)
    bag_of_referring_instances := USEDIN (set_of_input_instances[i] , '');
    IF EXISTS(bag_of_referring_instances) THEN
      number_of_referring_instances := SIZEOF(bag_of_referring_instances);
      dependently_instantiated_flag := false;
      REPEAT j:=1 TO number_of_referring_instances;
        (* Determine the type strings of the current referencing instance.
         *)
        set_of_types := TYPEOF(bag_of_referring_instances[j]);
        (* If the referencing instance is of one of the types of the
           only dependently instantiable select items, the current input
           instance may still be invalidly instantiated.
           Otherwise it is OK, and the next input instance is tested.
         *)
        IF set_of_types <= set_of_input_types THEN -- subset operator
          (* The referring instance is of one of the restricted types.
             However, it may itself be referred to by a valid instance;
             then also the current instance would be valid.
             Thus, call this function recursively with the referring
             instance as input.
             To avoid an infinite loop in case a set of instances
             reference each other in a closed loop, test first whether
             the current referencing instance is in the list of
             previously processed chain members.
           *)
          IF NOT (bag_of_referring_instances[j] IN previous_in_chain) THEN
            previous_in_chain_plus := previous_in_chain +
            set_of_input_instances[i];
            IF dependently_instantiated([bag_of_referring_instances[j]],
              set_of_input_types,
              previous_in_chain_plus) THEN
              dependently_instantiated_flag := true;
              ESCAPE; -- dependently instantiated; next input instance
            ELSE
              (* Not dependently instantiated: go to next referring
              instance. *)
              SKIP;
            END_IF;
          END_IF;
        ELSE
          dependently_instantiated_flag := true;
          ESCAPE; -- dependently instantiated; take next input instance
        END_IF;
      END_REPEAT;
      IF NOT dependently_instantiated_flag THEN
        RETURN(false);
      END_IF;
    ELSE
      RETURN(false); -- not referenced at all => invalidly instantiated
    END_IF;
  END_REPEAT;
ELSE
  RETURN(false); -- no input
END_IF;

RETURN(true);
END_FUNCTION;

Referenced By

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2012-03-27T17:14:40-04:00