Question

我刚开始喜欢UML2并陷入以下问题。

我定义了一个包含两个构造型的配置文件：ServiceRequest和TransitionEdge。 ServiceRequest使用两个附加属性（cpu，memory）扩展Action元类，而TransitionEdge使用名为“probability”的附加属性扩展ActivityEdge元类。所有这些属性都是float类型，定义为PrimitiveType。

我创建了一个应用了配置文件和构造型的活动图。在活动图中，每个边都是在配置文件中定义的TransitionEdge，并且已将值分配给probability属性。

使用配置文件和活动模型，我使用以下Java代码加载它们。

// Load the profile
URI profileUri = URI.createURI(PROFILE_NAME);
ResourceSet profileSet = new ResourceSetImpl();
profileSet.getPackageRegistry().put(UMLPackage.eNS_URI, UMLPackage.eINSTANCE);
profileSet.getResourceFactoryRegistry().getExtensionToFactoryMap().put(UMLResource.FILE_EXTENSION, UMLResource.Factory.INSTANCE);
profileSet.createResource(profileUri);
Resource profileResource = profileSet.getResource(profileUri, true);
Profile profile = (Profile)EcoreUtil.getObjectByType(profileResource.getContents(), UMLPackage.Literals.PROFILE);
Profile sopraProfile = (Profile)profile.getOwnedMember(PROFILE_NAME);
Stereotype serviceRequestStereotype = (Stereotype)sopraProfile.getOwnedMember(STEREOTYPE_SERVICE_REQUEST); 
Stereotype transitionEdgeStereotype = (Stereotype)sopraProfile.getOwnedMember(STEREOTYPE_TRANSITION_EDGE); 

// Load the model
URI modelUri = URI.createURI(MODEL_NAME);
ResourceSet modelSet = new ResourceSetImpl();
modelSet.getPackageRegistry().put(UMLPackage.eNS_URI, UMLPackage.eINSTANCE);
modelSet.getResourceFactoryRegistry().getExtensionToFactoryMap().put(UMLResource.FILE_EXTENSION, UMLResource.Factory.INSTANCE);
modelSet.createResource(modelUri);
Resource modelResource = modelSet.getResource(modelUri, true);
Model model = (Model)EcoreUtil.getObjectByType(modelResource.getContents(), UMLPackage.Literals.MODEL);

EList<Element> elements = model.getOwnedElements();
for(Element e : elements){
     if(e instanceof Activity){
    Activity activity = (Activity)e;
    EList<ActivityEdge> edges = activity.getEdges();
    for(ActivityEdge edge : edges){
        System.out.println(edge.getValue(transitionEdgeStereotype, "probability"));
    }
     }
}

在元素上调用getValue方法时抛出异常。以下是错误消息：

org.eclipse.uml2.uml.internal.impl.PropertyImpl@7a6d6a3f (name: base_ActivityEdge, visibility: <unset>) (isLeaf: false) (isStatic: false) (isOrdered: false, isUnique: true, isReadOnly: false) (aggregation: none, isDerived: false, isDerivedUnion: false, isID: false)

org.eclipse.uml2.uml.internal.impl.PropertyImpl@255a8ce4 (name: probability, visibility: public) (isLeaf: false) (isStatic: false) (isOrdered: false, isUnique: true, isReadOnly: false) (aggregation: none, isDerived: false, isDerivedUnion: false, isID: false)

Exception in thread "main" java.lang.IllegalArgumentException: org.eclipse.uml2.uml.internal.impl.StereotypeImpl@442f4161 (name: TransitionEdge, visibility: <unset>) (isLeaf: false, isAbstract: false, isFinalSpecialization: false) (isActive: false)
    at org.eclipse.uml2.uml.internal.operations.ElementOperations.getValue(ElementOperations.java:527)
    at org.eclipse.uml2.uml.internal.impl.ElementImpl.getValue(ElementImpl.java:296)
    at test.Test.main(Test.java:68)

我无法弄清楚发生了什么。有什么建议？非常感谢!!

Answer 1

Element.getValue（...）方法需要传递实际的Stereotype实例，该实例与模型一起使用。

在第一个块中，您将从单独的ResourceSet中检索您的Stereotype实例，而不是在第二个块中用于模型的ResourceSet。因此，在加载模型时会再次加载配置文件，并创建另一个Stereotype实例。你需要将那个传递给Element.getValue（...）。

这是最安全的方法：

Activity activity = ...
Stereotype transitionEdgeStereotype = 
    activity.getAppliedStereotype(STEREOTYPE_TRANSITION_EDGE);
if (transitionEdgeStereotype != null) {
    System.out.println(edge.getValue(transitionEdgeStereotype, "probability"));
}

修改：在这种情况下，STEREOTYPE_TRANSITION_EDGE需要是构造型的完全限定名称，包括配置文件名称，例如： ServiceProfile :: TransitionEdge。

Eclipse UML2：获取配置文件中定义的属性的值

1 个答案: