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N-level undo of collections of child objects is pretty complex, a fact that will become clear in the implementation of BusinessListBase The biggest of several problems arises when a new child object is added to the collection, and then the collection s parent object is canceled In that case, the child object must be removed from the collection as though it were never there the collection must be reset to its original state To support this, child objects must keep track of the edit level at which they were added UndoableBase made use of an EditLevel property that returned a number corresponding to the number of times the object s state had been copied for later undo From a UI programmer s perspective, the edit level is the number of times BeginEdit() has been called, minus the number of times CancelEdit() or ApplyEdit() has been called An example might help.

In some cases, abstract syntax tree nodes can end up consuming significant portions of the application s memory budget. In this situation, it can be worth memoizing some or all of the nodes constructed in the tree. You can even go as far as memoizing all equivalent nodes, ensuring that equivalence between nodes can be implemented by pointer equality, a technique often called hash-consing. Listing 9-3 shows an abstract representation of propositional logic terms that ensures that any two nodes that are syntactically identical are shared via a memoizing table. Propositional logic terms are terms constructed using P AND Q, P OR Q, NOT P, and variables a, b, and so on. A non-cached version of the expressions would be as follows:

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Suppose that there is an Invoice object with a collection of LineItem objects If BeginEdit() is called on the Invoice, then its edit level is 1 Since it cascades that call down to its child collection, the collection and all child objects are also at edit level 1 If a new child object is added to the collection, it would be added at edit level 1 If the Invoice object is then canceled, the user expects the Invoice object s state to be restored to what it was originally effectively, back to the level 0 state Of course, this includes the child collection, which means that the collection somehow needs to realize that the newly added child object should be discarded To do this, the BusinessListBase code will loop through its child objects looking for any that were added at an edit level higher than the current edit level.

Listing 9-3. Memoizing the Construction of Abstract Syntax Tree Nodes type Prop = | Prop of int and internal PropRepr = | AndRepr of Prop * Prop | OrRepr of Prop * Prop | NotRepr of Prop | VarRepr of string | TrueRepr open System.Collections.Generic module PropOps = let internal uniqStamp = ref 0 type internal PropTable() = let fwdTable = new Dictionary<PropRepr,Prop>(HashIdentity.Structural) let bwdTable = new Dictionary<int,PropRepr>(HashIdentity.Structural) member t.ToUnique(repr) = if fwdTable.ContainsKey(repr) then fwdTable.[repr] else let stamp = incr uniqStamp; !uniqStamp let prop = Prop(stamp) fwdTable.Add(repr,prop) bwdTable.Add(stamp,repr) prop member t.FromUnique(Prop(stamp)) = bwdTable.[stamp] let internal table = PropTable() // public construction functions let And(p1,p2) = table.ToUnique(AndRepr(p1,p2)) let Not(p) = table.ToUnique(NotRepr(p)) let Or(p1,p2) = table.ToUnique(OrRepr(p1,p2)) let Var(p) = table.ToUnique(VarRepr(p)) let True = table.ToUnique(TrueRepr) let False = Not(True) // deconstruction function let getRepr(p) = table.FromUnique(p)

In this example, when the Invoice is canceled, its edit level immediately goes to 0 It cascades that call to the child collection, which then also has an edit level of 0 The collection scans its child objects looking for any that were added at an edit level greater than 0, and finds the new child object that was added at edit level 1 It then knows that this child object can be removed This implies that business objects if they re child objects must keep track of the edit level at which they were added.

#imagegallery li { display: inline; } #imagegallery li a img { border: 0; } Applying that style sheet will give the image gallery a nice sheen:

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