private PropertyChange Undo(IDbEntity e, PropertyChange lastChange)
{
if (!lastChange.IsOrphan(e) ||
(lastChange.IsDbEntityEnumerable && lastChange.After == null && lastChange.Before != null))
{
lastChange.Revert(e);
}
return(MoveLastChange(lastChange));
}
private PropertyChange Redo(IDbEntity e, PropertyChange lastChange)
{
if (!lastChange.IsOrphan(e) ||
(lastChange.IsDbEntityEnumerable && lastChange.After != null && lastChange.Before == null))
{
lastChange.Apply(e);
}
_lastChange = lastChange;
PropertyChange nextChange = null;
if (!_lastChange.Equals(_changes.Last()))
{
nextChange = _changes[_changes.IndexOf(_lastChange) + 1];
}
return(nextChange);
}