In this case, a combination of a loop fragment and a diamond shape can be used to represent the loop with the if condition. In some cases, loops may be combined with if conditions to test for a condition on each iteration of the loop. The arrows emanating from each diamond indicate the possible outcomes of the condition, with the solid arrows representing true conditions, and the dashed arrows representing false conditions. For example, the following diagram shows how a nested if statement could be used to determine whether a function call returns one of several values:Īs we can see, the nested if statement is represented by multiple diamonds, each representing a separate condition. In this case, the sequence diagram can become quite complex. Sometimes, if conditions can be nested within one another to test for multiple conditions. The two arrows emanating from the if diamond represent the two possible outcomes of the if statement, and the two arrows emanating from the else diamond represent the two possible outcomes of the else statement. For example, the following diagram shows how an if-else statement could be used to test whether a function call returns a certain value:Īs we can see, the if-else statement is represented by two diamonds, one for the if condition and one for the else condition. These are used to test for the existence of two or more variables or conditions, and can be represented visually as a combination of two diamonds on the sequence diagram. The next type of if condition we will explore is the if-else condition. The two arrows emanating from the diamond represent the two possible outcomes of the if statement, with the solid arrow indicating the true condition, and the dashed arrow indicating the false condition. !()Īs we can see, the diamond shape is used to represent the if statement, with the condition being shown in the diamond. For example, the following diagram shows how an if statement could be used to determine whether an array contains a certain value: These are used to test for the existence of a single variable or condition, and can be represented visually as a diamond shape on the sequence diagram. The simplest form of if conditions is the Boolean condition. In this article, we will explore some of the most popular ways to represent if conditions in sequence diagrams, and provide examples to illustrate their use. Fortunately, there are several ways to do this depending on the type of if condition. One of the most common issues programmers face is how to represent if conditions in sequence diagrams. In essence, sequence diagrams provide a visualization of the flow of data in a system that makes it easy to identify dependencies and see the impact of changes. They help to represent the interactions between the entities of a software system graphically by showing how data and messages are passed between them. Attachment: InteractionConstraintProperties.Sequence diagrams are one of the most important tools in the field of software engineering.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. I also found this:, but I still can't figure this out. 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 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.
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