Java 当XMI无法正确加载容器时加载序列化的Ecore模型

我在内存中动态创建一个Ecore模型的实例，将其序列化为XMI，然后用户可以在我的应用程序运行时对其进行修改。因此，我随后对XMI进行反序列化，并将其与内存中的先前模型版本进行比较。 执行此操作时，模型中的包含引用似乎丢失了。假设底层Ecore模型是这样的：它有一个class

State

和一个class

Transition

，而

Transition

通过名为

Transition

的包含引用包含在

State

中，基数为0..*。因此，模型实例的简单序列化XMI可能如下所示：

<?xml version="1.0" encoding="ASCII"?>
<xmi:XMI xmi:version="2.0" xmlns:xmi="http://www.omg.org/XMI" xmlns:designmodel="http://www.example.org/designmodel">
  <designmodel:State xmi:id="0f359d4a-5154-462c-90aa-e125197cdb6d" name="Ready">
    <transition href="#7880aa8f-1e86-42e0-a212-e91326292d31"/>
  </designmodel:State>
  <designmodel:Transition xmi:id="7880aa8f-1e86-42e0-a212-e91326292d31" name="switchToWaiting"/>
</xmi:XMI>

ResourceSet savingResSet = new ResourceSetImpl();
savingResSet.getResourceFactoryRegistry().getExtensionToFactoryMap().put("xmi", new XMIResourceFactoryImpl());

XMIResource savingRes = (XMIResource) savingResSet.createResource(URI.createFileURI(outputPath), null);
savingRes.getDefaultSaveOptions().put(XMIResource.OPTION_KEEP_DEFAULT_CONTENT, Boolean.TRUE);


//adding the generated elements to the resource
generatedDesignmodelElements().forEach(e -> {
    if(e != null) {
        savingRes.getContents().add(e);
        savingRes.setID(e, UUID.randomUUID().toString());
    }
});

//saving it
try {
    savingRes.save(Collections.EMPTY_MAP);
} catch (IOException e) {
    e.printStackTrace();

ResourceSet resSet = new ResourceSetImpl();      
resSet.getResourceFactoryRegistry().getExtensionToFactoryMap().put("xmi", new XMIResourceFactoryImpl());
    XMIResource updatedModel =(XMIResource)resSet.getResource(URI.createFileURI(sourcePath), true);

//iterating over the objects directly contained in the resource (so all State- and Transition-objects get reached here, since they are root objects themselves)
updatedModel.getContents().forEach(updatedModelElement -> {
    System.out.println(updatedModelelement + updatedModelElement.eContainer()); //this is always NULL
});

反序列化如下所示：

<?xml version="1.0" encoding="ASCII"?>
<xmi:XMI xmi:version="2.0" xmlns:xmi="http://www.omg.org/XMI" xmlns:designmodel="http://www.example.org/designmodel">
  <designmodel:State xmi:id="0f359d4a-5154-462c-90aa-e125197cdb6d" name="Ready">
    <transition href="#7880aa8f-1e86-42e0-a212-e91326292d31"/>
  </designmodel:State>
  <designmodel:Transition xmi:id="7880aa8f-1e86-42e0-a212-e91326292d31" name="switchToWaiting"/>
</xmi:XMI>

ResourceSet savingResSet = new ResourceSetImpl();
savingResSet.getResourceFactoryRegistry().getExtensionToFactoryMap().put("xmi", new XMIResourceFactoryImpl());

XMIResource savingRes = (XMIResource) savingResSet.createResource(URI.createFileURI(outputPath), null);
savingRes.getDefaultSaveOptions().put(XMIResource.OPTION_KEEP_DEFAULT_CONTENT, Boolean.TRUE);


//adding the generated elements to the resource
generatedDesignmodelElements().forEach(e -> {
    if(e != null) {
        savingRes.getContents().add(e);
        savingRes.setID(e, UUID.randomUUID().toString());
    }
});

//saving it
try {
    savingRes.save(Collections.EMPTY_MAP);
} catch (IOException e) {
    e.printStackTrace();

ResourceSet resSet = new ResourceSetImpl();      
resSet.getResourceFactoryRegistry().getExtensionToFactoryMap().put("xmi", new XMIResourceFactoryImpl());
    XMIResource updatedModel =(XMIResource)resSet.getResource(URI.createFileURI(sourcePath), true);

//iterating over the objects directly contained in the resource (so all State- and Transition-objects get reached here, since they are root objects themselves)
updatedModel.getContents().forEach(updatedModelElement -> {
    System.out.println(updatedModelelement + updatedModelElement.eContainer()); //this is always NULL
});

那么：为什么这个

ecocontainer（）

-调用总是为我反序列化的XMIResource返回NULL，但在内存中的XMIResource上调用时行为正常

非常感谢：）

我自己解决了这个问题： 错误在于，我还单独添加了包含的EOObject（因此，除了它们之外，还通过容器对象隐式地添加到资源中）。

---

在将创建的EObject添加到资源之前，只需检查它是否有容器，然后在最后序列化即可解决所有问题。

很好，您用解决方案发回了！你也可以接受你自己的解决方案，这使得其他人更容易看到它解决了问题。