Figure 3-4: Creating the StateElement domain class in Visual C#

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Figure 3-4: Creating the StateElement domain class
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TIP Use the Named Domain Class tool to create a Name domain property
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The special tool for Named Domain Class actually does more than just creating a domain class and giving it a Name domain property; it also creates settings so that the Name property has unique default values and special treatment for serializing cross-references We ll see the details later As a rule of thumb, if you want to create a domain class whose instances have names, use the Named Domain Class tool
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The two domain classes IssueState and StartElement are created using the Domain Class tool since they will inherit from StateElement, they do not need a Name domain property Once the domain classes have been dropped onto the design surface and given their correct names, selecting the Inheritance tool and then clicking on the derived class and dragging
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3: Domain Model Definition
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and dropping it on the base class will create the inheritance connectors, as shown in Figure 3-5
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Figure 3-5: Creating an inheritance hierarchy
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At this point, each of the new classes appears twice on the design surface as a consequence of the way the domain model design is laid out In any domain model design, a particular domain class might appear many different times, depending on the various relationships that it has with other domain classes However, only one of these appearances represents the full de nition of the domain class; the rest are placeholders By right-clicking on one of the placeholder appearances and selecting Bring Tree Here from the context menu, you can rearrange the diagram so that the de nitions are conveniently placed, resulting in the reorganized layout shown in Figure 3-6 Other options to rearrange the layout include Split Tree, which has the opposite effect of Bring Tree Here, allowing you to divide up the tree into convenient sections, and Move Up and Move Down, which enable you to change the vertical order of the domain classes Also, the little square on the edge of the StateElement domain class contains a little
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sign; clicking in the square will cause everything hanging beneath it to collapse, leaving just the square containing a little + sign
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Figure 3-6: Reorganized layout of the inheritance hierarchy
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As we ve seen from this example, domain classes can participate in inheritance hierarchies Each domain class may have zero or one base domain class The notation for this is borrowed from UML and consists of a solid line with a triangular open arrowhead directed toward the base domain class The meaning is just as you would expect the derived domain class inherits all of the domain properties and domain relationships from the base class A domain class can be marked as abstract or sealed An abstract domain class cannot be directly instantiated it must instead have another domain class derived from it A sealed domain class cannot be inherited from Abstract domain classes appear on the diagram with a dashed border, and their names are in italics; sealed domain classes appear on the diagram with a heavy solid border Now we would like to give the IssueState domain class two domain properties: Description, so that the DSL user can give each IssueState some descriptive text, and Icon, so that the DSL user can associate an icon le with the state Right-clicking over the Domain Properties compartment of the domain class offers a context menu containing the option Add new DomainProperty; by using this, the desired properties are created, as shown in Figure 3-7
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3: Domain Model Definition
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Figure 3-7: New Domain Properties added to IssueState
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Figure 3-8 shows the Visual Studio properties window when the domain class StartElement is selected on the design surface The Description setting is selected in the properties window Every domain class has such a description, which is used to generate comments into the code and the XML Schema generated from the domain model Under the De nition category are settings for the Base Class from which this domain class inherits, the domain class s name, and the CLR Namespace into which code will be generated An explanation for each entry in the properties window can be obtained by pressing the F1 key, which will open the appropriate page of the online documentation Figure 3-9 shows the properties window when the Name domain property of the domain class StateElement is selected Each domain property has a type, which may be any CLR type In fact, the most commonly used types in a domain model are String, Boolean, and domain-speci c enumerations de ned in the DSL explorer (using the Add New Domain Enumeration command) A domain property may also be given a default value, which will be used to initialize its value when a new MEL is created
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