IEditedResourceProvider resourceProvider = new IEditedResourceProvider() {
    public XtextResource createResource() {
        MyDslActivator activator = MyDslActivator.getInstance();
        Injector injector = activator.getInjector(MyDslActivator.COM_MYORG_MYDSL);

        XtextResourceSet rs = injector.getInstance(XtextResourceSet.class);
        rs.setClasspathURIContext(getClass());

        IResourceFactory resourceFactory = injector.getInstance(IResourceFactory.class);
        URI uri = URI.createDeviceURI("file:///temp/MyDsl.mydsl");
        XtextResource resource = (XtextResource) resourceFactory.createResource(uri);
        rs.getResources().add(resource);

        EcoreUtil.resolveAll(resource);

        if (!resource.getErrors().isEmpty()) {
            // handle error?
        }
        return resource;
    }};

MyDslActivator activator = MyDslActivator.getInstance();
Injector injector = activator.getInjector(MyDslActivator.COM_MYORG_MYDSL);
EmbeddedEditorFactory factory = injector.getInstance(EmbeddedEditorFactory.class);
EmbeddedEditor embeddedEditor = factory.newEditor(resourceProvider).withParent(parent);
EmbeddedEditorModelAccess partialEditorModelAccess = embeddedEditor.createPartialEditor(false);
embeddedEditor.createPartialEditor();