internal ObjectDiff GetDiff(object oldStatus, object newStatus)
{
PropertyDiff[] propChanges = GetPropertyDiff(currentStatusAdaptor, oldStatus, newStatusAdaptor, newStatus);
PropertyDiff[] signalChanges = GetSignalDiff(currentStatusAdaptor, oldStatus, newStatusAdaptor, newStatus);
ArrayList changes = new ArrayList();
Hashtable foundChildren = new Hashtable();
// Register changed and deleted child elements
foreach (object oldChild in currentStatusAdaptor.GetChildren(oldStatus))
{
string cid = currentStatusAdaptor.GetUndoId(oldChild);
if (cid != null && cid.Length > 0)
{
object newChild = newStatusAdaptor.FindChild(newStatus, cid);
if (newChild != null)
{
// ChildCreate will work even if the packing element is null
ObjectDiff odiff = GetChildDiff(oldChild, newChild);
if (odiff != null)
{
ChildDiff cdiff = new ChildDiff();
cdiff.Id = cid;
cdiff.Operation = DiffOperation.Update;
cdiff.Diff = odiff;
changes.Add(cdiff);
}
foundChildren [cid] = cid;
}
else
{
ChildDiff cdiff = new ChildDiff();
cdiff.Id = cid;
cdiff.Operation = DiffOperation.Remove;
changes.Add(cdiff);
}
}
else
{
throw new InvalidOperationException("Found an element of type '" + oldChild.GetType() + "' without ID");
}
}
// Register new elements
string lastWidgetId = null;
foreach (object newChildElem in newStatusAdaptor.GetChildren(newStatus))
{
string cid = newStatusAdaptor.GetUndoId(newChildElem);
if (cid.Length > 0)
{
if (!foundChildren.ContainsKey(cid))
{
ChildDiff cdiff = new ChildDiff();
cdiff.Id = cid;
cdiff.Operation = DiffOperation.Add;
cdiff.AddContent = newStatusAdaptor.SerializeChild(newChildElem);
cdiff.InsertAfter = lastWidgetId;
changes.Add(cdiff);
}
}
else
{
throw new InvalidOperationException("Found an element of type '" + newChildElem.GetType() + "' without ID");
}
lastWidgetId = cid;
}
ChildDiff[] childChanges = null;
if (changes.Count > 0)
{
childChanges = (ChildDiff[])changes.ToArray(typeof(ChildDiff));
}
if (childChanges != null || propChanges != null || signalChanges != null)
{
ObjectDiff dif = new ObjectDiff();
dif.PropertyChanges = propChanges;
dif.SignalChanges = signalChanges;
dif.ChildChanges = childChanges;
return(dif);
}
else
{
return(null);
}
}
