Read only property and property constraints

[sovetnikov]

Hello!

I'm evaluating EA 10 and have a few questions.

Is there a way to:
1. Set readOnly prop-modifier for attribute?
I see nothing about it in attributes dialog, i can see isId, but not readOnly.

2. Show property constraints in attributes compartment of a class?

[qwerty]

1. create the attribute and select  Property. The window that pops up will allow what you need.

2. AFAIK no except you write some very tricky shape script

q.

[sovetnikov]

1. Thanks, but i do not see "is read only" in the general or details section of attributes window.
I'm missing something?

[Geert Bellekens]

You have to tick the checkbox "Property" on the General tab of the Attribute.

Geert

[sovetnikov]

Thanks Geert, now it's clear.
But i think this feature is primary for code generation, not for setting readOnly prop-modifier.

I expect that property will be presented as "+name:int {readOnly}"

[Geert Bellekens]

AFAIK there's no standard UML "read-only" property on an attribute.
So you'll either have to use a tagged value, or a constraint to indicate this.
Unfortunately attribute constraints are not visible on diagrams.

There's a very dirty trick however that you can use if your only intend is to show get is graphically in order.
You can create a tagged value with the name "xUML" If you set the value of this taggedvalue to "{read-only} this appears next to the attribute's definition.

Geert

[sovetnikov]

UML 2.4 Property class has isReadOnly attribute, as well as isID wich can be set directly in Details section.
Seems my problem is that in EA isReadOnly presented by Read and Write check boxes in property creation dialog and there is no way to display it in diagram.

xUML tagged value is great solution for me!

Thanks.

[Geert Bellekens]

Yes sorry you are right, there is indeed such an attribute.

I was just thinking, could it be that EA has translated this to the checkbox "Const"?

To be sure I checked the xmi file and bingo:

Code: [Select]

<ownedAttribute xmi:type="uml:Property" xmi:id="EAID_4883F552_015D_4b69_91D0_C6151A60078F" name="ValidFromConst" visibility="private" isStatic="false" [highlight]isReadOnly="true"[/highlight]
Geert

[Geert Bellekens]

And the great thing about it is that EA displays the required {readonly} constraint as a result as well.

Geert

[sovetnikov]

Great news!
It works.
I did not notice "Const" checkbox before