将 eclipse.emf.ecore.xmi.impl.XMIResourceImpl 转换为 eclipse.emf.ecore.resource.Resource$Factory

Question

我有这个简单的代码片段，它会抛出：

Exception in thread "main" java.lang.ClassCastException: org.eclipse.emf.ecore.xmi.impl.XMIResourceImpl cannot be cast to org.eclipse.emf.ecore.resource.Resource$Factory

相关代码：

import org.eclipse.emf.ecore.resource.impl.ResourceSetImpl;
import org.eclipse.emf.ecore.xmi.impl.XMIResourceImpl;
import org.eclipse.emf.ecore.resource.ResourceSet;
import org.eclipse.emf.ecore.resource.Resource;
public class Graphe {
    public static void main(String[] args) {
        org.eclipse.emf.ecore.resource.Resource.Factory.Registry reg=org.eclipse.emf.ecore.resource.Resource.Factory.Registry.INSTANCE;
        Map<String, Object> myMap=reg.getExtensionToFactoryMap();
        myMap.put("graphes", new XMIResourceImpl());
        ResourceSet resSet=new ResourceSetImpl();
        Resource res=  resSet.getResource(URI.createURI("My.graphes"), true);//exception here
    }
}

第二行抛出异常。 My.Graphes 是我使用 EMF 创建并将其导出到 eclipse 主机存储库的插件。非常感谢任何帮助

Answer 1

您遇到的异常是由于 getExtensionToFactoryMap 处理 Factory 作为映射值，而不是 Resource。它将 URI 的扩展映射到 Resource Factory，这将创建正确的 Resource.

要处理您的问题，您只需注册 XMIResourceFactoryImpl 而不是 XMIResourceImpl:

myMap.put("graphes", new XMIResourceFactoryImpl());

将 eclipse.emf.ecore.xmi.impl.XMIResourceImpl 转换为 eclipse.emf.ecore.resource.Resource$Factory

cast eclipse.emf.ecore.xmi.impl.XMIResourceImpl to eclipse.emf.ecore.resource.Resource$Factory

java

eclipse

eclipse-emf

eclipse-emf-ecore

emf