如何以编程方式从Java类运行Xpand代码生成器？

Question

我试图通过定义一个DSL并执行M2M以及M2T（代码生成）来实现模型驱动的开发。对于代码生成，我选择使用XPand和模板定义。您能否提供示例代码或链接到说明如何从Java代码调用模板扩展的文档？

P.S.我发现很难在Eclipse以外的独立模式下运行这样的事情，所以我开始编写简单的Java实用程序。

Answer 1

这里是任何有兴趣的代码：

Resource.Factory.Registry reg = Resource.Factory.Registry.INSTANCE; 
    Map<String, Object> factoryMap = reg.getExtensionToFactoryMap(); 
    factoryMap.put(Resource.Factory.Registry.DEFAULT_EXTENSION, new XMIResourceFactoryImpl()); 

    ResourceSet resourceSet = new ResourceSetImpl(); 
    EPackage PSM_Pkg = MyDSLPackage.eINSTANCE; 
    resourceSet.getPackageRegistry().put(PSM_Pkg.getNsURI(), PSM_Pkg); 

    Resource resource = resourceSet.getResource(Constants.PSM_URI, true); 
    EList<EObject> inObjects = resource.getContents(); 

    // Xpand 
    URI outURI = URI.createURI("file:///C:/Users/..."); 
    Output out = new OutputImpl(); 
    Outlet outlet = new Outlet(outURI.toFileString()); 
    out.addOutlet(outlet); 
    XpandExecutionContextImpl executionContext = new XpandExecutionContextImpl(out, null); 

    // Configure the metamodels 
    EmfMetaModel emfMetaModel = new EmfMetaModel(); 
    emfMetaModel.setMetaModelPackage(MyDSLlPackage.class.getName()); 
    executionContext.registerMetaModel(emfMetaModel); 
    XpandFacade xpandFacade = XpandFacade.create(executionContext); 
    Object[] params = null; 
    System.out.println(inObjects.get(0)); 
    xpandFacade.evaluate("template::Template::main", inObjects.get(0), params); 
    System.out.println("Code generated.");