3: Domain Model Definition in Visual C#

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3: Domain Model Definition
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annotations on the generated XML Schema, which provide extra IntelliSense assistance to a DSL user hand-writing XML in the target domain The Help Keyword is used to associate an optional keyword with the domain class that can be used to index F1 Help
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DomainClassInfo When the store is initialized with a domain model, a DomainClassInfo object is created for every domain class in the domain model Objects like this provide runtime access to the domain model, enabling the caller to discover the properties of a domain class, what domain properties it contains, which relationships it participates in, and its inheritance hierarchy Objects like these are useful for writing programs that need to operate across the store, independently of the speci c domain model that is loaded programs such as generic user interfaces, debugging tools, serialization tools, animation tools, and so on This code fragment illustrates how to acquire a DomainClassInfo object from a suitably initialized store and query it:
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IssueState s1 = new IssueState(store); DomainClassInfo dci = s1GetDomainClass(); string className = dciName; ReadOnlyCollection<DomainPropertyInfo> = dciAllDomainProperties; ReadOnlyCollection<DomainRoleInfo> = dciLocalDomainRolesPlayed;
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TIP Every DomainInfo object has an Id property
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Every Info object DomainClassInfo, DomainPropertyInfo, DomainRelationshipInfo, DomainRoleInfo has an Id property that gives a unique SystemGuid for the Info object Some of the DSL Tools APIs require these Ids to be passed as parameters, although most require references to the objects themselves
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The class DomainClassInfo also provides several static utility methods that are mainly concerned with manipulating the names of MELs These methods could also have been implemented on the class ModelElement but have been made static methods on DomainClassInfo in order to reduce the surface area of ModelElement and thus improve the IntelliSense experience for generated classes that derive from ModelElement
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More about Domain Propertie s
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The customization settings for a domain property are accessed using the properties window when the domain property is selected, as shown in Figure 3-24
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Figure 3-24: Properties for the Name domain property
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Most domain properties in a DSL are typically typed as String, Boolean, or an enumeration de ned as part of the DSL These enumerations can be speci ed either as public or internal An enumeration may optionally be marked as Flags, in which case its values are interpreted as a bit eld
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TIP Domain properties of Flags types have a custom editor with checkboxes
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When a domain property s type is an enumeration marked as Flags, the property will automatically show up in the properties window of the generated tool with a custom editor that allows you to set the bit eld using checkboxes
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3: Domain Model Definition
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In fact, a domain property may have any CLR value type, including types de ned outside the DSL The default value for the domain property, if there is one, must be a string that converts validly to a value of the domain property s type Normally, a domain property generates a public CLR property on the generated class It s possible to separately specify the access modi er for the generated getter and setter via Getter Access Modi er and Setter Access Modi er to be private, internal, or protected in fact, any of the access modi ers allowed by the CLR The DSL author might place such restrictions in order to limit the way that the domain property can be used, and hence in order to limit support costs We earlier saw that one domain property in a class may be marked as being a name (by setting Is Element Name to True) When this is set, a built-in algorithm is used to create default values for the name domain property that are unique for the MEL and its siblings within the context of the same embedding MEL The default algorithm appends a number to the name property s default value, or to the domain class name if there is no default value For example, the Name domain property in the StateElement domain class has no default value This means that the default unique names for IssueStates within the same IssueStateModel will be IssueState1, IssueState2, IssueState3, and so on This algorithm may be overridden by de ning a class that derives from the built-in ElementNameProvider class, implementing its SetUniqueName() method with the desired algorithm, and setting the Element Name Provider property to refer to the new class When the generated designer is running, selecting a shape on the diagram or an entry in the model explorer will cause the domain properties de ned for the domain class of the selected MEL to show up in the properties window, named by their Display Name Domain properties can be hidden from the properties window by marking them with Is Browsable set to False, and if they are browsable they will show up in gray and with editing disabled if they are marked Is UI Read Only set to True The properties window is organized into categories, and the domain property s Category can be speci ed by a string If no category is speci ed, the property will appear in the category Misc When a property is selected in the properties window, its Description will appear, giving the DSL
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