How to use

org.eclipse.emf.ecore.util.EcoreUtil$Copier

constructor

EObject oldInstance = instance;
instance = EmfUtils.clone(instance);
Copier copier = new Copier(false, false);

/**
 * copies contents of a resource set into a new one
 */
public static <T extends ResourceSet> T clone(T target, ResourceSet source) {
  EList<Resource> resources = source.getResources();
  EcoreUtil.Copier copier = new EcoreUtil.Copier();
  for (Resource resource : resources) {
    Resource resource2 = target.createResource(resource.getURI());
    resource2.getContents().addAll(copier.copyAll(resource.getContents()));
  }
  copier.copyReferences();
  return target;
}

/**
 * Returns a self-contained copy of the eObject.
 * @param eObject the object to copy.
 * @return the copy.
 * @see Copier
 */
public static <T extends EObject> T copy(T eObject)
{
 Copier copier = new Copier();
 EObject result = copier.copy(eObject);
 copier.copyReferences();
 
 @SuppressWarnings("unchecked")T t = (T)result;
 return t;
}

/**
 * Returns a collection of the self-contained copies of each {@link EObject} in eObjects.
 * @param eObjects the collection of objects to copy.
 * @return the collection of copies.
 * @see Copier
 */
public static <T> Collection<T> copyAll(Collection<? extends T> eObjects)
{
 Copier copier = new Copier();
 Collection<T> result = copier.copyAll(eObjects);
 copier.copyReferences();
 return result;
}

/**
 * Returns a self-contained copy of the eObject.
 * @param eObject the object to copy.
 * @return the copy.
 * @see Copier
 */
public static <T extends EObject> T copy(T eObject)
{
 Copier copier = new Copier();
 EObject result = copier.copy(eObject);
 copier.copyReferences();
 
 @SuppressWarnings("unchecked")T t = (T)result;
 return t;
}

/**
 * Clones the given model. Either an {@link EObject}, {@link Resource} or {@link ResourceSet}.
 * @param notifier The root container of the model.
 * @return The cloned model.
 */
public static Notifier clone(Notifier notifier) {
  Copier copier = new Copier();
  Notifier clonedModel = clone(notifier, copier, null);
  copier.copyReferences();
  return clonedModel;
}

/**
 * Clones the given EObject without resolving any proxies.
 */
@SuppressWarnings("unchecked")
public static <T extends EObject> T cloneWithProxies(T original) {
  if (original == null)
    return original;
  EcoreUtil.Copier copier = new EcoreUtil.Copier(false);
  T copy = (T) copier.copy(original);
  copier.copyReferences();
  return copy;
}

public BuildElement createWorkingCopy() {
  EcoreUtil.Copier copier = new EcoreUtil.Copier();
  BuildElement newElement = (BuildElement) copier.copy(this);
  // FIXME clone containment hierarchy instead
  copier.copyReferences();
  newElement.original = this;
  return newElement;
}

/**
 * Returns a collection of the self-contained copies of each {@link EObject} in eObjects.
 * @param eObjects the collection of objects to copy.
 * @return the collection of copies.
 * @see Copier
 */
public static <T> Collection<T> copyAll(Collection<? extends T> eObjects)
{
 Copier copier = new Copier();
 Collection<T> result = copier.copyAll(eObjects);
 copier.copyReferences();
 return result;
}