load protobuf Model

[wangm...@gmail.com]

Hi :

      i am using Protobuf-dt,now i want to load protobuf model  for example :

   

public EObject loadModel(URI uri, URI root) {
 // resolve the input uri, in case it is a relative path
 URI absURI = uri.resolve(root);
 if (! uri.equals(absURI)) {
 // add this pair to URI converter so that others can get the URI by its relative path
 resourceSet.getURIConverter().getURIMap().put(uri, absURI);
 }
 
 // load root model
 Resource resource = null;
 try {
 resource = resourceSet.getResource(absURI, true);
 resource.load(Collections.EMPTY_MAP);
 } catch (IOException e) {
 e.printStackTrace();
 return null;
 }
 EObject model = resource.getContents().get(0);
 
 // load all its imports recursively
 for (Iterator<String> it = fileHandlerRegistry.get(absURI.fileExtension()).importsIterator(model); it.hasNext();) {
 String importURIStr = it.next();
 URI importURI = URI.createURI(importURIStr);
 URI resolvedURI = importURI.resolve(absURI);
 
 // add this pair to URI converter so that others can get the URI by its relative path
 resourceSet.getURIConverter().getURIMap().put(importURI, resolvedURI);
 
 loadModel(resolvedURI, root);
 }
 return model;
 }

but when resource = resourceSet.getResource(absURI, true);  error:
1) null returned by binding at com.google.eclipse.protobuf.ProtobufRuntimeModule.configureExtensionRegistry(ProtobufRuntimeModule.java:75)
 but com.google.eclipse.protobuf.scoping.ProtoDescriptorProvider.registry is not @Nullable
  while locating com.google.eclipse.protobuf.scoping.ExtensionRegistryProvider
  while locating org.eclipse.core.runtime.IExtensionRegistry
    for field at com.google.eclipse.protobuf.scoping.ProtoDescriptorProvider.registry(Unknown Source)

is there any method to load protobuf model?

i try createInjectorAndDoEMFRegistration override but still

  public Injector createInjectorAndDoEMFRegistration() {
        // the FrancaPackage might not be registered because the EMF model is not part of the DSL
        if (! EPackage.Registry.INSTANCE.containsKey(com.google.eclipse.protobuf.protobuf.ProtobufPackage.eNS_URI)) {
            EPackage.Registry.INSTANCE.put(com.google.eclipse.protobuf.protobuf.ProtobufPackage.eNS_URI, com.google.eclipse.protobuf.protobuf.ProtobufPackage.eINSTANCE);
        }
        return super.createInjectorAndDoEMFRegistration();

    }

[wangm...@gmail.com]

add :  i want use protobuf-dt stanalone with acceleo 

resourceSet.getResourceFactoryRegistry().getExtensionToFactoryMap().put(key, Object);

does the protobuf-dt  provide facroty 

like resourceSet.getResourceFactoryRegistry().getExtensionToFactoryMap().put(UMLResource.FILE_EXTENSION, UMLResource.Factory.INSTANCE); to registerResourceFactories

thank

在 2015年1月23日星期五 UTC+8下午5:48:58，wangm...@gmail.com写道：

[Klaus Birken]

Hi,

I had the same problem - and found the cause for it and also a workaround. Actually, the solution requires a patch in protobuf-dt code.

The problem occurs because the following provider's get() method will return null if the code is not running in the Eclipse IDE (which is the case if running standalone). 

@Singleton public class ExtensionRegistryProvider implements Provider<IExtensionRegistry> {

@Override public IExtensionRegistry get() {

return Platform.getExtensionRegistry();

}

}

Google Guice's injector will call this get() method and complain about the null-result during injection of field ProtoDescriptorProvider.registry. This default behavior of Guice can be changed by declaring the field as @Nullable:

@Singleton public class ProtoDescriptorProvider {

 [...]

 @Inject @Nullable private IExtensionRegistry registry;
 ...

Guice allows to use any @Nullable annotation (it just checks for the simple name). If you do not have any @Nullable annotation at hand, simply use this one:

@Target({ FIELD })

@Retention(RUNTIME)

@interface Nullable { }

The final step is to add some checks for registry==null in the code of class ProtoDescriptorProvider. Just find the only occurrence of field registry and add a null check:

private ProtoDescriptorInfo descriptorInfoFromExtensionPoint() {

       // registry will be null if not running in the Eclipse IDE

       if (registry == null) {

          return null;

       }

...

 

That's it, hope this helps!

Klaus