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Custom (runtime) attributes set for EClass [message #206066]

Thu, 18 September 2008 12:17

Eclipse User

Hi all!
Fist of all, I am new to GMF, so please excuse for probably stupid
questions..

Q: In a model I have a class MyClass with defined attribute 'name'. In
runtime some info arrives (logic pairs of key names and values) and I want
to add it as attributes of MyClass. As a result, I want to have the same
behavior as for legacy attribute 'name': to show new attributes in
property-view on-selection, to show them in graphical MyClass
representation, to persist all data (including new attributes) in xml and
so on. Does GMF able to do it?

In generated code for my model I see factories and other stuff which is
statically bind to content of my model- meta-class names and attributes
each have own (predefined) ids. But maybe there is a way to dynamically
map data model to GUI model?

Thanks,
Artem

Re: Custom (runtime) attributes set for EClass [message #206131 is a reply to message #206066]

Fri, 19 September 2008 07:17

Eclipse User

Hello Artem,

Looks like you have to add child node to MuClass with possibility to store
key-value pairs + create property view handling it.

-----------------
Alex Shatalin

Re: Custom (runtime) attributes set for EClass [message #206284 is a reply to message #206131]

Mon, 22 September 2008 11:51

Eclipse User

Alex,

Thanks for your reply!
But could you please explain it for me?
> Looks like you have to add child node to MuClass with possibility to store
> key-value pairs + create property view handling it.

To be cleare, I understand nothing.

I've tried to use attribute with type EList<?> but EMF warried me (on
generation step from .ecore to .genmodel) that this type can't be
persisted. Exact message is "Attribute xxxxx is not transient so it must
have a datatype that is serializable". Can you say smth about EList
attributes and GMF? Maybe GMF is so smart that generates code with nice
GUI control for list of values? Or this should be done manually?

Re: Custom (runtime) attributes set for EClass [message #206293 is a reply to message #206284]

Mon, 22 September 2008 12:20

Eclipse User

Hello Artem,

>> Looks like you have to add child node to MuClass with possibility to
>> store key-value pairs + create property view handling it.
I mean:
- create one more class MyKeyValuePair with two features: key:EString, value:EString.
- create containment reference in MyClass pointing to the MyKeyValuePair
with multiplicity *.
- generate code using EMF - as a result you'll be able to store corresponding
values in a model

Then you can either implement additional properties page for MyClass getting/editing
all the existing key/value pairs.
Another option - implement appropriate parser visualizing list of key/values
somewhere i a diagram label of MyClass.
Another option - visualize MyKeyValuePair as a child node of MyClass in a
separated compartment. As a result you'll be able to add/remove/edit this
list using the diagram.

GMF is able to generate editing code only for last use case. The rest can
be implemented manually + plugged into the generated diagramming code.

-----------------
Alex Shatalin

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