private IMapWillChange <I, INode> WillChange(IMapWillChange <I, INode> change)
{
var node = change.Object.GetStateTreeNode() as ObjectNode;
node.AssertWritable();
var map = change.Object as IObservableMap <I, INode, T>;
switch (change.Type)
{
case ChangeType.UPDATE:
{
var oldValue = map.GetValue(change.Name);
if (change.NewValue == oldValue)
{
return(null);
}
StateTreeUtils.Typecheck(SubType, change.NewValue.StoredValue);
change.NewValue = SubType.Reconcile(node.GetChildNode(change.Name.ToString()), change.NewValue.StoredValue);
ProcessIdentifier(change.Name.ToString(), change.NewValue);
}
break;
case ChangeType.ADD:
{
StateTreeUtils.Typecheck(SubType, change.NewValue.StoredValue);
change.NewValue = SubType.Instantiate(node, change.Name.ToString(), node.Environment, change.NewValue.StoredValue);
ProcessIdentifier(change.Name.ToString(), change.NewValue);
}
break;
}
return(change);
}
