#IF CONDITIONS SEQUENCE DIAGRAM HOW TO#

In the UML, an object in a sequence diagram is drawn as a rectangle containing the. It shows the dynamic collaboration between multiple objects by describing the temporal order in which messages are sent between them. Attachment: InteractionConstraintProperties. A sequence diagram, also known as a sequence diagram, sequential diagram or sequential diagram, is a UML interaction diagram.Attachment: InteractionOperandProperties.png.Attachment: sequenceDiagramErrorMessage.png.These are all set to something, but it's not clear to me what I have to set them to. 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. Quote: The required feature 'uml::Constraint::specification' of 'prescreen::prescreen::CombinedFragment34::InteractionOperand0::guard' must be set. Here is a snapshot of my sequence diagram, showing the CombinedFragment:Īs you can see from the picture, there is a red X on the constraint, and when I hover on that, it says: 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. This is the second, It shows a message funcA. Section 17.6.3.7 (Alternatives) of UML 2.5 says, 'If none of the operands has a guard that evaluates to true, none of the operands are executed and the remainder of the enclosing InteractionFragment is executed. I drew two diagrams, and I dont know which way is right, The first one is this, I think its wrong because it doesnt show the function call as a message from A to B. If you do not specify a guard condition, both alternatives are skipped.

#IF CONDITIONS SEQUENCE DIAGRAM HOW TO#

I also found this:, but I still can't figure this out. The problem is how to draw the condition As I mentioned, It is reverse engineering. The picture in the answer shown here: is close to what I need, except that there is no 'else'. I found a StackOverflow question/answer that shows what I want it to look like. I don't understand what I have to drop where. I have seen switch-case recommendations for activity diagram, however I can not find an example for sequence diagram. 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. There are two steps that I need to show as conditional, on a variable expression.

I posted this question on StackOverflow, but perhaps it would be better here.

If conditions sequence diagram