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Customized Serialization Code There are some circumstances where the DSL author needs to customize the serialization more than is enabled by the use of the elements described so far Let s say, for example, that a domain class called Versioned has four integer properties called Major, Minor, Revision, and Build, representing the different parts of a version number The DSL author has decided that in the serialization, this should be represented as an element such as <version>1000</version> By default, the properties would be represented as attributes: <versioned major="1" minor="0" revision="0"
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build="0" />
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Referring back to Figure 6-11, each Class Data node has a property called Is Custom If this is set to True, then the generated serialization code calls methods on the serializer class such as CustomRead() and CustomWrite(), instead of the Read() and Write() methods described earlier These methods are not implemented in the generated code and must be hand-coded To make this simpler, the code that would have been generated for these methods is generated into another set of methods on the serializer class with names like DefaultRead() and DefaultWrite(), so that implementing the CustomXXX() methods by calls to the DefaultXXX() methods will give the original behavior This gives a exible customization scheme for implementing your own customization code by intermingling custom code with calls to the generated defaults To customize the serialization for the version number then involves writing code in a CustomWritePropertiesAsElements() method in a partial class as follows:
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private static void CustomWritePropertiesAsElements( SerializationContext serializationContext, Versioned element, XmlWriter writer) { Versioned instance = element as Versioned; if (!serializationContextResultFailed && instance != null) { String[] parts = { instanceMajorToString(), instanceMinorToString(), instanceRevisionToString(), instanceBuildToString() };
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String dot = ""; writerWriteElementString("version", StringJoin(dot, parts)); } }
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This method needs to be called from the CustomWriteElements() method, the remainder of which is copied verbatim from the DefaultWriteElements() method Complementary code must be written in the custom read methods to acquire the serialized string, split it into its constituents, and set the corresponding properties
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Impact of Customization on the Schema Once the serialization for a domain class has Is Custom set to True, it is not possible to generate an effective XML schema to validate it Instead, a exible schema complexType is generated, as follows:
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<xsd:complexType name="Versioned" mixed="true"> <xsd:sequence> <xsd:any minOccurs="0" maxOccurs="unbounded" processContents="lax" /> </xsd:sequence> <xsd:anyAttribute processContents="lax" /> </xsd:complexType>
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This schema is usually suf ciently exible to avoid warnings in the saved model le, although Visual Studio will offer informational messages that schema information cannot be found for the contents of the customized elements This schema will, however, give warnings for unusual domain models when the domain class whose serialization is customized inherits from another domain class that is the target of an embedding relationship In such cases, the exible complexType shown above is not substitutable for the base class complexType, and schema validation errors will occur whenever instances of the customized domain class are embedded via this relationship These will appear as warnings when the model le is loaded in the target designer To avoid these warnings it is necessary to customize the schema by modifying its generation template or simply to write one by hand
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In this chapter we explained how the models and diagrams created using a DSL are saved to les in domain-speci c XML This XML is designed to be easily readable by humans and consumable by other tools We have seen how the serialization is carried out by generated code, which is fully accessible to the DSL author We ve discussed how the code that reads les is forgiving of errors and how versioning and migration work We also explained several customization options for the XML and the generated schema, through serialization data properties and through writing additional code
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