URI modelURI = URI.createFileURI("/test/myFile.xmi");
File folder = new File("/test/");
List<String> arguments = new ArrayList<String>();

Xmi2Vhdlfile generator = new Xmi2Vhdlfile(modelURI, folder, arguments);
generator.doGenerate(new BasicMonitor());

if (!isInWorkspace(VhdlamsPackage.class)) {
                 // The normal package registration if your metamodel is in a plugin.
                 resourceSet.getPackageRegistry().put(VhdlamsPackage.eNS_URI, VhdlamsPackage.eINSTANCE);
             } else {
                 // The package registration that will be used if the metamodel is not deployed in a plugin.
                 // This should be used if your metamodel is in your workspace and if you are using binary resource serialization.
                 resourceSet.getPackageRegistry().put("/myproject/MyVhdlMetamodel.ecore", VhdlamsPackage.eINSTANCE);
            }

RunnableWithProgress operation = new IRunnableWithProgress() {
    public void run(IProgressMonitor monitor) {
        URI modelURI = URI.createPlatformResourceURI("YOUR MODEL PATH", true);
	List<String> arguments = new ArrayList<String>();
	try {
		IContainer target = project.getFolder("YOUR TARGET FOLDER");
		GenerateAll generator = new GenerateAll(modelURI, target, arguments);
		generator.doGenerate(monitor);
	} catch (IOException e) {
		IStatus status = new Status(IStatus.ERROR, Activator.PLUGIN_ID, e.getMessage(), e);
		Activator.getDefault().getLog().log(status);
	}
     }
};
try {
	PlatformUI.getWorkbench().getProgressService().run(true, true, operation);
} catch (InvocationTargetException e) {
	IStatus status = new Status(IStatus.ERROR, Activator.PLUGIN_ID, e.getMessage(), e);
	Activator.getDefault().getLog().log(status);
} catch (InterruptedException e) {
	IStatus status = new Status(IStatus.ERROR, Activator.PLUGIN_ID, e.getMessage(), e);
	Activator.getDefault().getLog().log(status);
}