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CHAPTER 3 s BUSINESS FRAMEWORK IMPLEMENTATION
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This method won t be removing any items from the collection as changes are accepted, so the simpler For...Each looping structure can be used rather than the bottom-to-top numeric looping structure needed in the UndoChanges() method. When looping through the DeletedList collection, however, the bottom-to-top approach is still required. This is because DeletedList may contain child items that were newly added to the collection and then were marked for deletion. Since they are new objects, they have no corresponding data in the database, and so they can simply be dropped from the collection in memory. In such a case, those child objects will be removed from the list based on their edit level value. This completes all the functionality needed to support n-level undo, allowing BusinessListBase to integrate with the code in the UndoableBase class.
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BeginEdit, CancelEdit, and ApplyEdit
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With the n-level undo methods complete, it is possible to implement the methods that the UI will need in order to control the edit process on a collection. Remember, though, that this control is only valid if the collection is a root object. If it s a child object, then its edit process should be controlled by its parent object. This requires a check to ensure that the object isn t a child before allowing these methods to operate: Public Sub BeginEdit() If Me.IsChild Then Throw New _ NotSupportedException(My.Resources.NoBeginEditChildException) End If CopyState() End Sub Public Sub CancelEdit() If Me.IsChild Then Throw New _ NotSupportedException(My.Resources.NoCancelEditChildException) End If UndoChanges() End Sub Public Sub ApplyEdit() If Me.IsChild Then Throw New _ NotSupportedException(My.Resources.NoApplyEditChildException) End If AcceptChanges() End Sub All three methods are very straightforward and allow developers to create a UI that starts editing a collection with BeginEdit(), lets the user interact with the collection, and then either cancels or accepts the changes with CancelEdit() or ApplyEdit(), respectively.
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System.ICloneable
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The BusinessListBase class implements the System.ICloneable interface. This interface defines a Clone() method that can be called to create a clone, or copy, of an object. The Csla.Core. ObjectCloner class implements a general cloning solution that works against any serializable
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CHAPTER 3 s BUSINESS FRAMEWORK IMPLEMENTATION
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object, making it very easy to implement a Clone() method. Additionally, BusinessListBase is a generic class, so it can implement a strongly typed Clone() method like Csla.BusinessBase. As in Csla.Core.BusinessBase, the clone operation is implemented through an Overridable method named GetClone(), allowing the business developer to override the default cloning behavior if desired: Private Function ICloneable_Clone() As Object Implements ICloneable.Clone Return GetClone() End Function <EditorBrowsable(EditorBrowsableState.Advanced)> _ Protected Overridable Function GetClone() As Object Return ObjectCloner.Clone(Me) End Function Public Overloads Function Clone() As T Return DirectCast(GetClone(), T) End Function The ICloneable.Clone() and strongly typed Clone() methods delegate to GetClone() to do their work. Other than the data access functionality that will be added in 4, this concludes the functionality for the BusinessListBase class.
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With BusinessBase and BusinessListBase finished (at least for the time being), a business developer has the tools needed to build editable objects and collections. However, most applications also include a number of read-only objects and collections. An application might have a read-only object that contains system configuration data, or a read-only collection of ProductType objects that are used just for lookup purposes.
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s Tip
5 will include a NameValueListBase class designed specifically to handle name/value lookup data.
The ReadOnlyBase class will provide a base on which business developers can build a read-only object. The chapter will conclude with the ReadOnlyListBase, which supports read-only collections of data. By definition, a read-only object is quite simple: it s just a container for data, possibly with authorization or formatting logic to control how that data is accessed. It doesn t support editing of the data, so there s no need for n-level undo, change events, or much of the other complexity built into UndoableBase and BusinessBase. In fact, other than data access logic, the base class can only implement the CanReadProperty() authorization methods and the ICloneable interface. Like all base classes, this one is serializable and MustInherit. It will also implement Csla.Core.IBusinessObject to provide some level of polymorphic behavior even though this is a generic class: <Serializable()> _ Public MustInherit Class ReadOnlyBase(Of T As ReadOnlyBase(Of T)) Implements ICloneable Implements Core.IReadOnlyObject End Class
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