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  • Created by Unknown User (wah), last modified on Oct 18, 2012
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Initial and Final States are pseudo states in Yakindu SCT. The Initial State can only have one outgoing transition and no incoming. It is represented with a black filled circle. The Final State can only have one incoming transition and no outgoing. To create an Initial or Final State, we have to select Initial or Final State element in the palette and then draw it on the appropriate region.

Goal:  Initial and Final States are normal or composite states with a thicker border.

  1. Modify the Metamodel (org.yakindu.sct.model.sgraph/model/emf/sgraph.genmodel) by adding two attributes (isInitial and isFinal) to the State Class


     and then generate the code


  2. Modify the State Figure (org.yakindu.sct.ui.editor/src/org/yakindu/sct/ui/editor/editor/figures/StateFigure.java) by setting the constants NORMAL_BORDER_WIDTH and THICK_BORDER_WIDTH and adding two variables isDoubleLineBorder and isThickBorder. If the value of isDoubleLineBorder is set to true, the RoundedRectangle is represented with a double line border. If the value of isThickBorder is set to true, the RoundedRectangle is represented with a thicker line border.

    Overwrite the outlineShape method


    And add the method getBorderWidth
  3. Modify the Propertysheets (org.yakindu.sct.ui.editor/src/org/yakindu/sct/ui/editor/propertysheets/StatePropertySection.java) by adding an Is Initial ComboBox and an Is Final ComboBox. The user may select the option true or false.





    After that, the State Properties view will look like this:


  4. Modify the State EditPart (org.yakindu.sct.ui.editor/src/org/yakindu/sct/ui/editor/editparts/StateEditPart.java) by adding the following code lines in the method handleNotificationEvent to update the border width or to add a double line border to the state, if the user changes the Is Initial or Is Final options.
  5. Remove the Initial and Final State icon from the palette by removing them from the list of Elements situated in the file org.yakindu.sct.ui.editor/plugin.xml.
  6. Modify the SGraphValidator (org.yakindu.sct.model.sgraph/src/org/yakindu/sct/model/sgraph/util/SGraphValidator.java)
  7. The creation wizard creates a new diagram which includes an Initial State and a Normal State. We should modify the creation wizard by modifying the method createStatechartModel (org.yakindu.sct.ui.editor/src/org/yakindu/sct/ui/editor/factories/FactoryUtils.java)
  8. Clean the code where the old Initial and Final States are implemented (FinalStateFigure, InitialStateFigure, ...) 
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