[great-dev] Re: [udm-users] RE: [great-users] "Com exception: Object cannot bechanged"

Mon Apr 11 14:39:16 CDT 2005

Dear All,

Please consider the simple example attached, and tell me what should I write into the AttributeMapping box in the 2nd rule so that the final rule matches.
The example uses the "HouseModel" and "Order" metas supplied with GReAT.

Please don't forget that in my "real" models the Instance and Archetype are in different folders therefore I don't think I can use an association class (or can I?).

Thanks,
Tivadar

-----Original Message-----
From: Endre Magyari 
Sent: Sunday, April 10, 2005 2:33 PM
To: Tivadar Szemethy; great-users
Subject: Re: [great-dev] Re: [udm-users] RE: [great-users] "Com
exception: Object cannot bechanged"

> 2) from the same guard/AttrMap create an association (defined in

> How do I create the association of step 2) ?
>

 From this point of view, an object's archetype has the same type, so you  
have to create an association between two objects of the same type. (of  
course-  you must have such an association defined in your UML meta)

MyClass a; //MyClass is defined in MyClass.h and it is your custom class

// init. of a

if (a.isInstance())
{
	MyClass type = a.Archetype();

	// if it is a simple association
	a.assoc_role_name() = type;
	//type.assoc_other_role_name() = a; //it works either way

	//if it is an assoc. class based association

	MyAssocClass mac;
	//init. of mac

	mac.assoc_role_name_end() = a;
	mac.assoc_other_role_name_end() = type;

	//a.assoc_other_role_name() = mac; type.assoc_role_name() = a; //it works  
either way
};

in any case, this works only if you have defined in your Uml meta diagram  
an association between a MyClass and itself. And if so, you have defined  
in the generated API, for class MyClass, the accessor functions for  
getting/setting associations.

If you don't have the generated API and you need to do this generically,  
you can use:
Udm::ObjectImpl::setAssociation
Udm::Object::setAssociation
Udm::Object::CreateLink

functions. I can further help on that, if you don't have access to the  
domain specific API.

Endre

>
> Endre Magyari wrote:
>
>>
>> Then the code is:
>>
>> Udm::Object o;
>>
>> if (o.isInstance())
>> {
>>     //o is an instance, only it's type can be modified
>>     Udm::Object type = o.archetype();
>>     //modify type
>> }
>> else
>> {
>>     //o is not an instance, it's either an normal object(model, fco,
>> atom) or  a derived object, which can be modified.
>>     //if it's a derived object, isSubtype() returns true
>> };
>>
>>
>>
>> Note that this is generic code, but since all generated types are
>> inherited from  Udm::Object, isInstance(), isSubtype() works.
>> For the generated classes in UDM API there is also available an
>> Archetype()call, which is typed, it returns with an object of the
>> same  type.
>>
>>
>> Endre
>>
>>
>>
>> On Fri, 8 Apr 2005 10:20:39 -0500, Attila Vizhanyo
>> <viza at isis.vanderbilt.edu> wrote:
>>
>>> Tivadar wants to (1) query if an object is instance or not (2) if it  
>>> is,
>>> get access to its type object, and modify the type object.
>>>
>>>
>>>> -----Original Message-----
>>>> From: Endre Magyari
>>>> Sent: Friday, April 08, 2005 2:06
>>>> To: udm-users
>>>> Cc: This is a list for GReAT developers to exchange
>>>> development related thoughts and ideas
>>>> Subject: [great-dev] Re: [udm-users] RE: [great-users] "Com
>>>> exception: Object cannot bechanged"
>>>>
>>>>
>>>>
>>>>
>>>>
>>>> Attila,
>>>>
>>>>     there is no UDM API which permits to modify an instance
>>>> object - besides,
>>>> Tivadar is talking about a COM exception thrown by MGA layer.
>>>>     So, what kind of solution did you mean ?
>>>>
>>>> Thanks,
>>>> Endre
>>>>
>>>>
>>>> On Thu, 7 Apr 2005 16:42:22 -0500, Attila Vizhanyo
>>>> <viza at isis.vanderbilt.edu> wrote:
>>>>
>>>> > I believe these problems can be solved using the UDM API
>>>> from Guard/
>>>> > AttributeMapping code. I'm forwarding your post to the
>>>> udm-users list.
>>>> >
>>>> > Thanks,
>>>> > Attila
>>>> >
>>>> >
>>>> >> -----Original Message-----
>>>> >> From: Tivadar Szemethy
>>>> >> Sent: Thursday, April 07, 2005 16:28
>>>> >> To: great-users
>>>> >> Subject: [great-users] "Com exception: Object cannot be changed"
>>>> >>
>>>> >>
>>>> >> Hello,
>>>> >>
>>>> >> In a GReAT transformation, I have to make temporary
>>>> modifications to
>>>> >> my src model in order to make further processing easier. However,
>>>> >> some of the objects in the src are Instances (as in General
>>>> >> Properties/Type in the Attribute Panel in GME) of other objects
>>>> >> defined in a "Model Library" folder in the src model.
>>>> >>
>>>> >> As I understand, instances cannot be modified.
>>>> >> Therefore, I need to come up with a GReAT rule, which:
>>>> >>
>>>> >> a) checks whether the object in question is an Instance or not
>>>> >> b) if it is, returns the corresponding "Template" object
>>>> which can be
>>>> >> modified
>>>> >>
>>>> >> How do I do this ?
>>>> >>
>>>> >> Thanks,
>>>> >>
>>>> >> Tivadar
>>>> >> _______________________________________________
>>>> >> great-users mailing list great-users at list.isis.vanderbilt.edu
>>>> >> http://list.isis.vanderbilt.edu/mailman/listinfo/great-users
>>>> >>
>>>> > _______________________________________________
>>>> > udm-users mailing list
>>>> > udm-users at list.isis.vanderbilt.edu
>>>> > http://list.isis.vanderbilt.edu/mailman/listinfo/udm-users
>>>>
>>>>
>>>> _______________________________________________
>>>> great-dev mailing list
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>>>>
>>> _______________________________________________
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>>
>>
>>
>
>

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