EMF从ECore中XMI在运行时

Question

生成模型类据我所知，我们可以生成Ecore模型是这样的：

// 动态创建一个Book的子类，Magic power comes from here 
     // create the SchoolBook EClass 
     EClass schoolBookEClass = efactory.createEClass(); 
     schoolBookEClass.setName("SchoolBook"); 

     // create a new attribute for this EClass 
     EAttribute level = efactory.createEAttribute(); 
     level.setName("level"); 
     level.setEType(epackage.getEInt()); 
     schoolBookEClass.getEStructuralFeatures().add(level); 

     // 设置父类 
     schoolBookEClass.getESuperTypes().add(ExtlibraryPackage.eINSTANCE.getBook()); 

     // 创建新的课程类 
     EClass courseEClass = efactory.createEClass(); 
     courseEClass.setName("Course"); 

     // 课程名称属性 
     EAttribute courseName = efactory.createEAttribute(); 
     courseName.setName("courseName"); 
     courseName.setEType(epackage.getEString()); 
     courseEClass.getEStructuralFeatures().add(courseName); 

     // 课程对教材的引用关系 
     EReference courseBook = efactory.createEReference(); 
     courseBook.setName("courseBook"); 
     courseBook.setEType(schoolBookEClass); 
     courseBook.setContainment(false); 
     courseEClass.getEStructuralFeatures().add(courseBook); 

     // 创建包 
     EPackage schoolPackage = efactory.createEPackage(); 
     schoolPackage.setName("elv"); 
     schoolPackage.setNsPrefix("elv"); 
     schoolPackage.setNsURI("http:///www.elver.org/School"); 
     schoolPackage.getEClassifiers().add(courseEClass); 
     schoolPackage.getEClassifiers().add(schoolBookEClass); 
     EPackage.Registry.INSTANCE.put(schoolPackage.getNsURI(), schoolPackage); 

没有这样的类在classpath中所有，但我们可以将它们用于其他操作，创建ui，例如保存到数据库。

如果我在xml文件中定义了一些EMF模型类（例如mymodel.ecore），它只包含那些ECore模型的XMI序列化。那么如何在运行时创建它们的实例，而无需在classpath上生成类。

Answer 1

实际上，你可以加载Ecore模型在运行时实例化对象：

ResourceSet resourceSet = new ResourceSetImpl(); 
    resourceSet.getResourceFactoryRegistry().getExtensionToFactoryMap().put("ecore", new EcoreResourceFactoryImpl()); 
    Resource resource = resourceSet.getResource(URI.createFileURI("C:\\my.ecore"), true); 
    EPackage model = (EPackage)resource.getContents().get(0); 
    EClass eClass = (EClass) model.getEClassifiers().get(0); 
    EObject object = model.getEFactoryInstance().create(eClass);