ObjectUtil doesnt deep copy correctly

Question

I am using an ObjectProxy for a complex object containing
arrays of objects. I bind a datagrid to the array and . notation to
fields. This all works fine, datagrid behaiving properly, inserts
and deletes working properly.
I want to have an undo function that will put the objectproxy
object back to its original state. So when i open the screen with
the datagrid I do a ObjectUtil.copy() and use this latter if the
user wants to revert changes. The problem is that the copy doesn't
do a deep copy. In the Object is an ArrayCollection of userdefined
objects. These objects instead of being copied as their type are
being copied as plain objects.
The serialize meathod the copy uses doesn't retain the types
of user defined objects.
Will I have to create clone or copy methods for every object
type I have?
If so do I just need to make them ezxternalizable? How will
the objectutil copy pick up these methods?
Thanks,
Jeff

Answer 1

Unfortunatlly you will need to implement it for every class
that has complex objects, as it does not know how to deal with
them. Your classes need to extend EventDispatcher and/or implement
IExternalizable.
Then create methods writeExternal and readExternal for every
local variables you need to retain. eg..
public function writeExternal(output:IDataOutput):void {
output.writeUTF(msgString);
output.writeObject(anyObject);
output.writeInt(id);
public function readExternal(input:IDataInput):void {
msgString = input.readUTF()as String;
anyObject = input.readObject()as Array;
id = input.readInt() as int;
}