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This is '''Chapter 9'''. Here is the first part, [[Training:Bootcamp:Chapter 1|Chapter 1]], or see [[Training:Bootcamp:Chapter 8|Chapter 8 (the previous chapter)]]

=== '''Video 9: Inheritance and Statemachines''' ===
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 <span data-video="MPqx5af3QCM" data-start="00" tabindex="0"> <strong> Steps 265 - 301 </strong> </span>
    <span class="navigation-item" data-video="MPqx5af3QCM" data-start="00" tabindex="0"> Introduction </span>
    <span class="navigation-item" data-video="MPqx5af3QCM" data-start="27" tabindex="0"> Aligning items </span>
    <span class="navigation-item" data-video="MPqx5af3QCM" data-start="322" tabindex="0"> Inheritance </span>
    <span class="navigation-item" data-video="MPqx5af3QCM" data-start="870" tabindex="0"> Abstract classes </span>
    <span class="navigation-item" data-video="MPqx5af3QCM" data-start="1230" tabindex="0"> Repetition </span>
    <span class="navigation-item" data-video="MPqx5af3QCM" data-start="1647" tabindex="0"> Statemachines </span>
    <span class="navigation-item" data-video="MPqx5af3QCM" data-start="1845" tabindex="0"> Triggers and entry </span>
    <span class="navigation-item" data-video="MPqx5af3QCM" data-start="2250" tabindex="0"> Guards </span>
    <span class="navigation-item" data-video="MPqx5af3QCM" data-start="2883" tabindex="0"> Class actions for triggers </span>
    <span class="navigation-item" data-video="MPqx5af3QCM" data-start="3041" tabindex="0"> Web application example </span>
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== Chapter 9: Inheritance and Statemachines ==
'''In this chapter, we introduce [[UML Inheritance|UML inheritance]] and [https://wiki.mdriven.net/index.php/UML_%E2%80%93_State_machines UML Statemachines].'''

265. Remove the 20-pixel margin on the buttons and apply the Align Items property end instead, to make everything end up on the bottom line.

266. Test out combinations of Justify content and Align Items, and determine how to familiarize yourself with ways to control the flow of UI widgets.

267. Introduce the new class '''CarDealer'''.

268. Introduce the new class '''CarOwner'''. 

269. Add generalization arrows from '''CarDealer''' to '''CarOwner''' and from '''Person''' to '''CarOwner'''.

270. Add the Attribute <code>Name:String</code> to '''CarOwner''' and save.  
* Notice the error.  
* Make sure you understand why '''Name''' is reported as a doublet.  
* Fix it by removing '''Name of Person'''. 
271. Make sure you understand Subclass and Superclass. Look up and read through these articles on the Wiki: 
* [[UML_Inheritance]]
* [[UML School|UML_School#Lesson_3:_UML_Inheritance]].
272. Add a new association from '''CarOwner''' to '''Car'''. Name the '''Car''' end as '''CurrentlyOwnedCars'''. 

273. Delete the old link with the currently owned car. Update the autoforms. Save and check for errors.  

274. Delete the Combobox that showed the now-removed currently owned car in the '''Person''' form.

275. Add a new class: '''CarTransferOwnershipDocument''', and add a new association from <code>Car(0..1)</code> to <code>CarTransferOwnershipDocument(*)</code>

276. Add an association from '''CarOwner''' to '''CarTransferOwnershipDocument'''. Call the link <code>DocumentsForSales(*)</code> and <code>Seller(0..1)</code>

277. Add another association from '''CarOwner''' to '''CarTransferOwnershipDocument'''. Call the link <code>DocumentsForPurchase(*)</code> and <code>Buyer(0..1)</code>

278. Add '''CarFactory''' and make it a subclass of '''CarOwner'''.

279. Add '''ScrapYard''' and make it a subclass of '''CarOwner'''.

280. Add a statemachine on Class '''Car'''.

281. Add a state in the statemachine of the car called '''BrandNew'''.

282. Add another state: '''InOwnershipTransaction'''.

283. Add a Transition arrow from '''BrandNew''' to '''InOwnershipTransaction'''.

284. Call the trigger of the transition '''InitiateSale'''.

285. Add yet another state called '''OwnershipStable'''.

286. Add a transition from '''InOwnershipTransaction''' to '''OwnershipStable'''. Name the trigger '''CloseSale'''.

287. Add a transition from '''OwnershipStable''' to '''InOwnershipTransaction'''. Reuse the trigger '''InitiateSale''' on this transition.

288. Create an <u>Entry Action</u> in the state '''InOwnerShipTransaction'''.  
* Create a <code>CarTransferOwnershipDocument</code> and add it to the cars list of '''CarTransferOwnershipDocuments'''.  
* Also, assign the '''Seller''' of the new '''CarTransferOwnershipDocument''' to the current owner of the '''Car'''. 
289. Add an association from '''CarTransferOwnershipDocumen'''t to '''Car'''. Call the single-end '''CurrentTransaction'''. Set the Car's end to '''not Navigable'''. 

290. In the Entry Action, in the state '''InOwnerShipTransaction''', assign the '''CurrentTransaction''' to the created document.

291. Go to Guard of CloseSale and check that the current transaction has a '''Buyer'''. 

292. In the '''OwnershipStable''', add an Entry action that removes the '''Car''' from '''Seller'''<nowiki/>'s '''CurrentlyOwnedCars''' and adds it to the '''Buyer'''<nowiki/>'s '''CurrentlyOwnedCars'''. 

293. In the '''OwnershipStable''', add an Entry action and add an update of the '''Seller'''<nowiki/>'s '''CarsOwnerUsedToOwn'''.

294. On the transition between '''BrandNew''' and '''InOwnerShipTransaction''', add a guard that checks that there is a '''CarOwner'''.

295. On the InitiateSale trigger, add a '''ClassAction''' for the trigger.

296. On the CloseSale trigger, add a '''ClassAction''' for the trigger.

297. Refresh the AutoForms.

298. Save and test on the web. 
* Create a '''CarFactory'''. 
* Call it '''BMW''' in '''Munich'''. 
* Add a '''Car''' to this '''CarFactory'''.
299. Initiate the Sale and check that you get a '''CarTransferOwnershipDocument'''.

300. Assign a buyer in the '''CarTransferOwnershipDocument''', then close the Sale. Check that ownership has switched. 

301. Set the default representation of '''CarOwner''' to <code>self.Name</code>

=== '''Next Chapter''' ===
[[Training:Bootcamp:Chapter 10|Bootcamp:Chapter 10]]
[[Category:Bootcamp]]