ResourceSet resSet = new ResourceSetImpl();
Resource resource = resSet.getResource(URI.createURI("http://defaultname/1.0"), true);
System.out.println(resource.getContents().get(0));

// Initialize the model
EcorePackage.eINSTANCE.eClass();
		
// Register the XMI resource factory for the .ecore extension
Resource.Factory.Registry reg = Resource.Factory.Registry.INSTANCE;
Map<String, Object> m = reg.getExtensionToFactoryMap();
m.put("ecore", new XMIResourceFactoryImpl());

// Obtain a new resource set
ResourceSet resSet = new ResourceSetImpl();

// Get the resource
Resource resource = resSet.getResource(URI.createURI("model/Diagram.ecore"), true);
		
EPackage ePackage = (EPackage)resource.getContents().get(0);
		
System.out.println(ePackage.getName());
		
TreeIterator<EObject> iterator = ePackage.eAllContents();
while(iterator.hasNext()) {
    System.out.println(iterator.next());
}

public class Main {

	public static void main(String[] args) {
		// Initialize the model.
		EcorePackage.eINSTANCE.eClass();
		
		// Register the XMI resource factory for the .ecore extension.
		Resource.Factory.Registry.INSTANCE.getExtensionToFactoryMap().put("ecore", new XMIResourceFactoryImpl());

		// Obtain a new resource set.
		ResourceSet resourceSet = new ResourceSetImpl();

		// Get the resource.
		Resource resource = resourceSet.getResource(URI.createURI("model/Diagram.ecore"), true);
		
		// Get the root of the resource.
		EPackage ePackage = (EPackage)resource.getContents().get(0);
		
		// Start a change recorder.
		ChangeRecorder changeRecorder = new ChangeRecorder(resourceSet);
		
		// Make a change to the class name.
		TreeIterator<EObject> iterator = ePackage.eAllContents();
		while(iterator.hasNext()) {
			EObject obj = iterator.next();
			if (obj instanceof EClass) {
				((EClass)obj).setName("Class_2");
			}
		}
		
		// End the change recording.
		ChangeDescription changeDescription = changeRecorder.endRecording();
		
		// Add the result to our resouce.
		resource.getContents().add(changeDescription);
		
		// Print the resource.
		try {
			resource.save(System.out, null);
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}		
	}
}

ResourceSet resourceSet = new ResourceSetImpl();
Resource resource = resourceSet.getResource(URI.createURI("c:\file.ecore"), true);
ChangeRecorder changeRecorder = new ChangeRecorder(resourceSet);