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);
}
public override IMap <string, INode> InitializeChildNodes(INode node, object snapshot)
{
IDictionary <I, S> values = snapshot as IDictionary <I, S>;
//if (snapshot is IDictionary<string, S> dictionary)
//{
// foreach(var item in dictionary.Keys)
// {
// values[item.ToString()] = dictionary[item];
// }
//}
IEnvironment env = node.Environment;
return(values.Aggregate(new Map <string, INode>(), (map, pair) =>
{
var subpath = $"{pair.Key}";
map[subpath] = SubType.Instantiate(node, subpath, env, pair.Value);
return map;
}));
}
