Developing Model-to-Text Transformations in Java

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CHAPTER 7 Developing Model-to-Text Transformations
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DEFINE setter FOR oocore::Attribute- EXPAND generatedComment FOR this- public void set nametoFirstUpper() ( thisdataTypename name ) { this name = name ; } ENDDEFINE DEFINE getter FOR oocore::Reference- IF thisgenerateReference()- EXPAND generatedComment FOR this- public wrapIfCollection(this) get nametoFirstUpper() () { return name ; } ENDIF ENDDEFINE DEFINE setter FOR oocore::Reference- IF thisgenerateReference()- EXPAND generatedComment FOR this- public void set nametoFirstUpper() ( wrapIfCollection(this) name ) { this name = name ; } ENDIF ENDDEFINE DEFINE method FOR oocore::Operation- EXPAND generatedComment FOR this- visibilitytoString()toLowerCase()- wrapIfCollection(this) name- ( EXPAND parameter FOREACH parameters SEPARATOR ',' ) { //TODO: implement method } ENDDEFINE DEFINE parameter FOR oocore::Parameter- wrapIfCollection(this) name- ENDDEFINE DEFINE generatedComment FOR Object- /** *@generated */ ENDDEFINE DEFINE toColumnName FOR String- FOREACH thistoCharList() AS char ITERATOR i- IF icounter0 == 0- chartoUpperCase()- ELSE- charasColumnNameChar()- ENDIF- ENDFOREACH- ENDDEFINE DEFINE additions FOR dnc::Archetype- ENDDEFINE
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This is the corresponding Xtend utility file dncUtilext:
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import dnc; import oocore; String fullyQualifiedName(Package p) : ppackage == null pname : fullyQualifiedName(ppackage) + '' + pname ; String fullyQualifiedName(Class c) : let p = fullyQualifiedName(cpackage) : p != '' && p != "javalang" p + '' + cname : cname ; String fullyQualifiedName(Void v) : ''; String fullyQualifiedPath(Class c) : fullyQualifiedName(cpackage)replaceAll('\\', '/') + "/" + cname + "java" ; String wrapIfCollection(Reference reference) : referenceupperBound == -1 "javautilCollection" + "<" + fullyQualifiedName(referencetype) + ">" : fullyQualifiedName(referencetype) ; Boolean isValid(Package package) : package != null && packagenamelength > 0 ; String asColumnNameChar(String s) : stoLowerCase() == s stoUpperCase() : '_' + stoUpperCase() ; Boolean isEntity(Class c) : cmetaType == dnc::MomentInterval || cmetaType == dnc::MIDetail || cmetaType == dnc::Party || cmetaType == dnc::Place || cmetaType == dnc::Thing || cmetaType == dnc::Description ; // Currently, we only create backward reference for ManyToOne relationships Boolean generateReference(oocore::Reference ref) : reftypeisEntity() && refoppositemetaType == dnc::Association && refoppositeupperBound == -1 ;
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CHAPTER 7 Developing Model-to-Text Transformations
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Finally, this the workflow file used to invoke the templates using a test dynamic instance model This is the same model that was used to feed the dnc2jeeqvto transformation
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< xml version="10" > <workflow> <property name="model" value="orgeclipsedsldnc/model/modelxmi" /> <property name="out" value="/orgeclipseexample/src-gen2" /> <!-- set up EMF for standalone execution --> <bean class="orgeclipseemfmweutilsStandaloneSetup"> <platformUri value="/" /> </bean> <!-- load model and store it in slot 'model' --> <component class="orgeclipseemfmweutilsReader"> <uri value="platform:/resource/${model}" /> <modelSlot value="model" /> </component> <!-- generate code --> <component class="orgeclipsexpand2Generator"> <metaModel id="mm" class="orgeclipsextendtypesystememfEmfRegistryMetaModel" /> <expand value="templates::java::dnc2java::Main FOR model" /> <outlet path="${out}"> <postprocessor class="orgeclipsexpand2outputJavaBeautifier"/> </outlet> </component> </workflow>
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Note the use of the JavaBeautifier in the generator component s outlet element Generally, it s better to rely on code formatters for generated code than sacrifice readability of the template itself in an effort to generate nicely formatted output directly However, it s often necessary to strike a balance because the Toolsmith must also be able to understand the code generated by the template
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Looking back at our two approaches, it s hard to say that one is better than the other The template-only approach seems a bit simpler, but this ultimately depends on your personal preference and familiarity in working with QVTO and Xpand/Xtend I did notice that many similar yet different constructs exist in OCL/QVTO and Xpand/Xtend This makes the GMF Xpand engine s use of
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OCL/QVTO an attractive alternative because you would need to know only one set of languages for all your transformation needs Sharing a single set of QVT libraries for both M2M and M2T would be most welcome When we start generating method body content, the template approach without the intermediate Java model likely will be the preferred approach Even better would be the capability for QVT to invoke an Xpand template using one of its black box extension mechanisms Of course, an enhanced Java model would be required if the former approach were used because the JEM model lacks the proper fidelity to create complex statements In the HTML example, if the domain model s serialization syntax is no different from how its instances are normally consumed, the choice of transformation options becomes more clear In the case of HTML, an M2M from a DSL to an XHTML model requires no M2T to obtain the desired result In fact, any XSD-based model imported into EMF provides the same characteristic Many popular or standard XML Schemas have already been used to produce Ecore models, enhanced with additional capabilities exposed as derived features and methods
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Consult the QVTO Metamodel Explorer to see what models are registered in your environment A full Eclipse installation contains many registered models, ranging from Web Service Definition Language (WSDL), to Enterprise Java Beans (EJB), to data models, to the Unified Modeling Language (UML) This explorer becomes handy when authoring transformations when you need to see the model structure and available features
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