Exposing the object structure from a list

Hello,

I want to use well known patterns for a problem I need to solve. I am
finding trouble with applying if in the moment - I am fairly new to
this, so please bear with me.

I need to design a class structure that looks like this at the moment


Client -------------------> List ---------------> External
Classes
| ^
| |
| |
--------------+---------------- |
| | | | | |
Obj Obj Obj Obj Obj------------+


That is, List is something of an iterator to an array. The List and/or
Objects have interfaces with external subsystems (to retrieve Object
properties) I do not want to expose. The Client is not capable of
adding or removing objects to the list, just modifying some properties
of each object. Now my question is, should I return the Object to the
client when it requests access, or use a "facade-like" structure in
which the List class controls access like this

List::SetCurrentObject(index)
List::GetObjProperty()
List::NextObject()

Or perhaps I should redesign Object so it does not have external
dependencies (keep the dependencies in the List class) and return a
reference to the Object to the client (and simplify List structure)??

Thanks for your help

Fabio