Polymorphic Templates多态模板

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1、PolymorphicTemplatesAdesignpatternforimplementingagilemodel-to-texttransformationsGáborKövesdán,MárkAsztalosandLászlóLengyelBudapestUniversityofTechnologyandEconomics,Budapest,Hungary{gabor.kovesdan,asztalos,lengyel}@aut.bme.huAbstract.Model-to-texttran

2、sformationsareoftenusedtoproducesourcecode,documentationorothertextualartefactsfrommodels.Acommonwayofimple-mentingthemisusingtemplatelanguages.Templatesareeasytoreadandwrite,however,theytendtobecomelongandcomplexasthecomplexityofthemeta-modelgrows.This

3、paperproposesadesignpatternthatallowsforthedecompo-sitionofcomplextemplateswithbranchingandconditionsinsideintosimplerones.Itsmainideaisthatthecodegeneratordoesnotknowabouttheconcretetemplatesthatarecalled:theyaredeterminedbytheobjectsofthemodelbeingtra

4、versed.Theconcretetemplateisselectedthroughobject-orientedpolymor-phism.Thepatternresultsinaflexiblecodegeneratorwithsimpletemplates,goodextensibilityandseparationofconcerns.Thisagilityfacilitatesthedesignforextensionandchanges,whichisparamountnowadays.

5、Keywords:Modeling·Domain-SpecificModeling·ModelTransformation·CodeGeneration·DesignPattern1IntroductionThispaperpresentsadesignpatternthatcanbeusedtocreateflexiblemodel-to-text(M2T)transformation.ThepatternisapplicableoncomplexM2Ttemplatesandpro-posesan

6、object-orienteddecompositionforthegenerator,themodelobjectsandthetemplates.Thisdecompositionachievesreducedcomplexity,separationofconcerns,improvedreadabilityandmostimportantlyimprovedmaintainabilityandflexibility.WebelievethatthePolymorphicTemplatespat

7、ternwillgreatlyhelpdevelopersofallkindsofM2Ttransformationsindesigningrobustcodegeneratorsthatareeasytomain-tainandextend.Therestofthispaperisorganizedasfollows.Section2brieflyexplainsthefounda-tionsofM2Ttransformationsusingtemplatelanguages.Section3lis

8、tsexistingworkavailableonthesubject.Section4describesthedesignpatterninaformatthatissimilartothosethatareusedindesignpatterncatalogs.Section5concludes.2BackgroundM2Ttransformationsareoftenusedforgeneratingsourcecode,documentation