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Composition is when you instantiate a class and then use that class to help you instantiate another class The MVC design pattern is based on composition Here s some code from the previous chapter that s a typical example of composition at work: private var _particleModel:ParticleModel = new ParticleModel(); private var _particleView:ParticleView = new ParticleView(_particleModel); The _particleModel is fed into the ParticleView s arguments so that the ParticleView class can use it in its own code Composition s big advantage over inheritance is that you can feed any class into any other class, and as long as it s the right type of class, it will work This way, you can write very general code that keeps your classes completely independent.

You may want to specify an alternative user in some cases----for instance, if you ll be logging in using an administrative account. This is handy for certain operations. You can do so with a statement such as:

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There are two different ways to model our invoices and deleted invoices. The approach we ve shown here is only recommended if you have an existing model and code base and would like to add the DeletedInvoice derived type with as little impact as possible to the existing code. For a new model, it would be better to derive an ActiveInvoice type and a DeletedInvoice type from the Invoice base type. In this approach, you would mark the base type as abstract. Using the approach we ve shown here, you could can determine, as we do in the code in Listing 626, if the entity is a DeletedInvoice either by casting or by using the OfType<>() method. However, you can t select for the Invoice entity alone. This is the critical drawback to the approach we ve shown here.

For this to work, you need a valid, active TGT (Ticket Granting Ticket) (which will be recognized via klist). This won t always be available, but it s possible to use an active TGT obtained by another local user. To do so, run sudo from root as follows:

This helps to isolate bugs from infecting other classes, and means that you can mix and match classes on a whim to try new things without breaking the code you ve already written It helps to achieve the OOP goal of encapsulation Yay, composition! The other game in town is inheritance Inheritance is when a new class extends a preexisting class so that the new class acquires all of the old class s properties and methods Whenever you create a new class using the keyword extends, you re using inheritance public class BouncingParticle extends Sprite BouncingParticle is a class that needs to be displayed on the stage It would be painstaking and tedious to tell BouncingParticle in code how to display itself on the stage It would be much better if we could just say, Hey, BouncingParticle! I m really busy.

The approach you should use for new code is to derive two new entities: ActiveInvoice and DeleteInvoice. With these two sibling types, you can use either casting or the OfType<>() method to operate on either type uniformly. Listing 6-26. Using the as operator to determine if we have an Invoice or DeletedInvoice using (var context = new EFRecipesEntities()) { context.Invoices.AddObject(new Invoice { Amount = 19.95M, Description = "Oil Change", Date = DateTime.Parse("4/11/10") }); context.Invoices.AddObject(new Invoice { Amount = 129.95M, Description = "Wheel Alignment", Date = DateTime.Parse("4/01/10") }); context.Invoices.AddObject(new DeletedInvoice { Amount = 39.95M, Description = "Engine Diagnosis", Date = DateTime.Parse("4/01/10") }); context.SaveChanges(); } using (var context = new EFRecipesEntities()) { foreach (var invoice in context.Invoices) { var isDeleted = invoice as DeletedInvoice; Console.WriteLine("{0} Invoice", isDeleted == null "Active" : "Deleted"); Console.WriteLine("Description: {0}", invoice.Description); Console.WriteLine("Amount: {0}", invoice.Amount.ToString("C")); Console.WriteLine("Date: {0}", invoice.Date.ToShortDateString()); Console.WriteLine(); } } The following is the output of the code in Listing 6-26: Active Invoice Description: Oil Change Amount: $19.95 Date: 4/11/2010

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I can t be bothered to tell you how to display yourself on the stage But Sprite already knows how to do this Please just borrow its code So BouncingParticle extends Sprite and inherits all of Sprite s properties and methods It means that you can use all of the Sprite class s properties, like alpha and visible in your new class without needing to code them yourself..

Amount: $129.95 Date: 4/1/2010

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