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Many of the inheritance examples so far have defined a class called PdaItem that defines the methods and properties common to Contact, Appointment, and so on, which are type objects that derive from PdaItem PdaItem is not intended to be instantiated itself, however A PdaItem instance has no meaning by itself; it has meaning only when it is used as a base class to share default method implementations across the set of data types that derive from it These characteristics are indicative of the need for PdaItem to be an abstract class rather than a concrete class Abstract classes are designed for derivation only It is not possible to instantiate an abstract class, except in the context of instantiating a class that derives from it Classes that are not abstract and can instead be instantiated directly are concrete classes



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BEGINNER TOPIC Abstract Classes Abstract classes represent abstract entities Their abstract members define what an object derived from an abstract entity should contain, but they don t include the implementation Often, much of the functionality within an abstract class is unimplemented, and before a class can successfully derive from an abstract class, it needs to provide the implementation for the abstract methods in its abstract base class

{ distributivity of disjunction over equivalence }

To define an abstract class, C# requires the abstract modifier to the class definition, as shown in Listing 618





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internal void OnStatusChangeAssociationSort(object sender, EventArgs e) { MenuCommand command = sender as MenuCommand; commandVisible = false; // Default not visible // Alternatively, we could leave it always visible, but: commandEnabled = false; // Default greyed out foreach (object selectedObject in thisCurrentSelection) { // We'll get a mixed bag of connectors and shapes // just deal with the ones we're interested in AssociationConnector associationConnector = selectedObject as AssociationConnector; if (associationConnector != null) { // We could do more checks on its state here commandVisible = commandEnabled = true; break; // Found one -- that's all we need! } } // Visible and Enabled flags passed back to menu }

// Define an abstract class public abstract class PdaItem { public PdaItem(string name) { Name = name; } public virtual string Name { get; set; } }

Note that the formula in the last line is completely symmetric inp,q and r. That is, because of the symmetry of equivalence and disjunction, any permutation of the three variables leaves the formula unchanged. To complete our task we use the lemma twice, once with a different permutation of the variables:

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public class Program { public static void Main() { PdaItem item; // ERROR: Cannot create an instance of the abstract class item = new PdaItem("Inigo Montoya"); } }

The OnMenu handler should perform the command on each applicable member of the current selection (There may be other items selected at the same time) Note that any change to a model item must be done within a transaction The selection is a set of shapes and connectors, but you normally want to operate on a shape or connector s subject in this case, the Association rather than the AssociationConnector

Although abstract classes cannot be instantiated, this restriction is a minor characteristic of an abstract class Their primary significance is achieved when abstract classes include abstract members An abstract member is a method or property that has no implementation Its purpose is to force all derived classes to provide the implementation Consider Listing 619

p A (q /\r)

// Define an abstract class public abstract class PdaItem { public PdaItem(string name) { Name = name; } public virtual string Name { get; set; } public abstract string GetSummary(); }

public class Contact : PdaItem { public override string Name { get { return FirstName + " " + LastName; } set { string[] names = valueSplit(' '); // Error handling not shown FirstName = names[0]; LastName = names[1]; } } public string FirstName { get; set; } public string LastName { get; set; } public string Address { get; set; } public override string GetSummary() { return stringFormat( "FirstName: {0} + "LastName: {1} + "Address: {2}", FirstName, LastName, Address); } // }

///<summary> /// Called to execute a command when the user selects the menu item /// This method is registered in GetMenuCommands ///</summary> internal void OnMenuChangeAssociationSort(object sender, EventArgs e) { MenuCommand command = sender as MenuCommand; // All changes must be done within a Transaction using (Transaction transaction = thisCurrentClassDiagramsDocDataStoreTransactionManager BeginTransaction("Change Association Sort menu command")) { // There may be a mixed bag of shapes and connectors foreach (object selectedObject in thisCurrentSelection)

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