Home » Modeling » Papyrus » Trouble making conditional block
| Trouble making conditional block [message #1837580] |
Tue, 02 February 2021 18:36  |
 David M. Karr
Messages: 802
Registered: July 2009 |
Senior Member |
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I posted this question on StackOverflow, but perhaps it would be better here.
I have a sequence diagram in Papyrus. There are two steps that I need to show as conditional, on a variable expression. I understand that I need to add a Combined Fragment, and it's probably the "opt" or perhaps "alt" Interaction Operator, but that's about all I can figure out. I don't understand what I have to drop where.
I found a StackOverflow question/answer that shows what I want it to look like: https://stackoverflow.com/questions/8114770/how-to-show-if-condition-on-a-sequence-diagram . Although I won't have an "else" block.
I have a sequence diagram in Papyrus. There are two steps that I need to show as conditional, on a variable expression. I understand that I need to add a Combined Fragment, and it's probably the "opt" or perhaps "alt" Interaction Operator, but that's about all I can figure out. I don't understand what I have to drop where.
The picture in the answer shown here: https://stackoverflow.com/questions/8114770/how-to-show-if-condition-on-a-sequence-diagram is close to what I need, except that there is no "else".
I also found this: https://www.eclipse.org/papyrus/resources/PapyrusTutorial_OnSequenceDiagrams_v0.1_d2010100.pdf , but I still can't figure this out.
I have managed to add an "opt" CombinedFragment, and I added something that looks like a constraint, which is shown in the picture in the SO posting.
Here is a snapshot of my sequence diagram, showing the CombinedFragment:
As you can see from the picture, there is a red X on the constraint, and when I hover on that, it says:
Quote:The required feature 'uml::Constraint::specification' of 'prescreen::prescreen::CombinedFragment34::InteractionOperand0::guard' must be set.
I can see when I click on the InteractionOperand, there is a "Guard" property, and when I click the Edit button for that, I see that there is a "Specification" property. These are all set to something, but it's not clear to me what I have to set them to.
[Updated on: Tue, 02 February 2021 22:22] Report message to a moderator |
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| Re: Trouble making conditional block [message #1837711 is a reply to message #1837580] |
Thu, 04 February 2021 13:29  |
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I had this error, but it vanishes when you actually add a guard constraint - as you did. A problem might be that the error appears right after creation of the combined fragment, but a re-validation is not triggered automatically when you add the constraint. Try to click on the combined fragment and use "Validation -> Validate subtree"
Concerning your 2nd question: First, add a 2nd interaction operand. One option (not sure, if there are cleaner ones) is to use an opaque expression as guard, with "natural language" as language and "else" as body.
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