如何从Java类以编程方式运行Xpand代码生成器？

Question

我试图通过定义一个领域特定语言和执行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文档链接，解释如何从Java代码调用模板扩展？

另外，我发现在Eclipse之外的独立模式下运行这些东西非常困难，所以我从编写简单的Java实用程序开始。

Answer 1

以下是任何感兴趣的人的代码：

    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.");