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The _isChild field is used to maintain whether the object is a child, and that value is exposed via an IsChild property: [NotUndoable()] private bool _isChild; protected internal bool IsChild { get { return _isChild; } } Notice that the field is declared using the [NotUndoable()] attribute. Since this value will never change during the lifetime of the object, there s no reason to include it in an n-level undo snapshot. The IsChild property will be used within other BusinessBase code, and may be useful to the business developer, so it s declared as protected. There are certain behaviors that are valid only for root objects and others that apply only to child objects. These rules will be enforced by throwing exceptions when an invalid operation is attempted. The Delete() and DeleteChild() methods implemented earlier are examples of this approach.

For high-performance applications of abstract syntax trees, it can occasionally be useful to cache computations of some derived attributes within the syntax tree itself. For example, let s say you want to compute bounding boxes for the geometric language described in Listing 9-1. It is potentially valuable to cache this computation at Composite nodes. You can use a type such as the following to hold a cache:

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If a business object is a child of a collection, then it will maintain a reference to its parent business object. As you saw earlier, this is required for implementation of System.ComponentModel. IEditableObject. To avoid circular reference issues with n-level undo and serialization, the field holding this reference must be declared with the [NotUndoable()] and [NonSerialized()] attributes. Without these attributes, UndoableBase will go into an infinite loop during CopyState(), and .NET serialization will create a much larger byte stream during serialization than is required. The value will also be exposed through a property: [NotUndoable()] [NonSerialized()] private Core.IEditableCollection _parent; [EditorBrowsable(EditorBrowsableState.Advanced)] protected Core.IEditableCollection Parent { get { return _parent; } } Due to the fact that the _parent field is not serializable, its value must be restored by the parent collection any time that deserialization occurs. To make this possible, the collection will call an internal method on the business object: internal void SetParent(Core.IEditableCollection parent) { if (!IsChild) throw new InvalidOperationException(Resources.ParentSetException); _parent = parent; } This method is only valid if the object is a child object, and all it does is store the parent object reference in the _parent field.

type SceneWithCachedBoundingBox = | Ellipse of RectangleF | Rect of RectangleF | CompositeRepr of SceneWithCachedBoundingBox list * RectangleF option ref This is useful for prototyping, though you should be careful to encapsulate the code that is responsible for maintaining this information. Listing 9-2 shows the full code for doing this. Listing 9-2. Adding the Cached Computation of a Local Attribute to an Abstract Syntax Tree type SceneWithCachedBoundingBox = | Ellipse of RectangleF | Rect of RectangleF | CompositeRepr of SceneWithCachedBoundingBox list * RectangleF option ref member x.BoundingBox = match x with | Ellipse(rect) | Rect(rect) -> rect | CompositeRepr(scenes,cache) -> match !cache with | Some v -> v | None -> let bbox = scenes |> List.map (fun s -> s.BoundingBox) |> List.fold1_left (fun r1 r2 -> RectangleF.Union(r1,r2)) cache := Some bbox bbox // Create a Composite node with an initially empty cache static member Composite(scenes) = CompositeRepr(scenes,ref None) Other attributes that are sometimes cached include the hash values of tree-structured terms and the computation of all the identifiers in a subexpression. The use of caches makes it more awkward to pattern match on terms. This can be largely solved by using active patterns, covered later in this chapter.

The complete layout.css file looks like this: body { font-family: "Helvetica","Arial",serif; color: #333; background-color: #ccc; margin: 1em 10%; } h1 { color: #333; background-color: transparent; } a { color: #c60; background-color: transparent; font-weight: bold; text-decoration: none; } ul { padding: 0; } li { float: left; padding: 1em; list-style: none; } #imagegallery { list-style: none; }

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