s BUSINESS FRAMEWORK IMPLEMENTATION in VB.NET

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CHAPTER 3 s BUSINESS FRAMEWORK IMPLEMENTATION
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This version of the method uses System.Diagnostics to retrieve the property name. But if access is denied, it optionally throws an exception. This allows code in a property to enforce property read and write authorization with just two lines of code and no string literals. The Boolean parameter to this method is only required to create a different method signature. Otherwise, the only difference would be the return type (or lack thereof ), which isn t sufficient for method overloading.
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System.ICloneable
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The BusinessBase 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 object, making it very easy to implement a Clone() method. However, there are cases in which a business developer might not want to return an exact clone of an object. To accommodate this case, the cloning will be handled by an Overridable method so that the business developer can override the method and replace the cloning mechanism with their own, if needed: Private Function 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 Notice that neither of these methods is Public. The only way to invoke this Clone() method is through the ICloneable interface. Later in the chapter, BusinessBase(Of T) will implement a strongly typed Public Clone() method by virtue of being a generic type. The GetClone() method is Protected in scope to allow customization of the cloning process by a business developer. While a straight copy of the object is typically the required behavior, sometimes a business object needs to do extra work when creating a clone of itself.
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The final type in the Csla.Core namespace is the ReadOnlyBindingList(Of C) class. This implements a read-only collection based on System.ComponentModel.BindingList(Of T). The standard BindingList(Of T) class implements a read-write collection that supports data binding, but there are numerous cases in which a read-only collection is useful. For example, ReadOnlyBindingList is the base class for Csla.ReadOnlyListBase, Csla.NameValueListBase, and Csla.Validation. BrokenRulesCollection. This class inherits from BindingList. It is also serializable and MustInherit, like all the framework base classes: <Serializable()> _ Public MustInherit Class ReadOnlyBindingList(Of C) Inherits System.ComponentModel.BindingList(Of C) Implements Core.IBusinessObject End Class All the basic collection and data binding behaviors are already implemented by BindingList. Making the collection read-only is a matter of overriding a few methods to prevent alteration of the
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CHAPTER 3 s BUSINESS FRAMEWORK IMPLEMENTATION
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collection. Of course, the collection has to be read-write at some point, in order to get data into the collection at all. To control whether the collection is read-only or not, there s a field and a property: Private mIsReadOnly As Boolean = True Public Property IsReadOnly() As Boolean Get Return mIsReadOnly End Get Protected Set(ByVal value As Boolean) mIsReadOnly = value End Set End Property Notice that while the IsReadOnly property is Public for reading, it is Protected for changing. This way, any code can determine if the collection is read-only or read-write, but only a subclass can lock or unlock the collection. The class contains a constructor that turns off the options to edit, remove, or create items in the collection by setting some properties in the BindingList base class: Protected Sub New() AllowEdit = False AllowRemove = False AllowNew = False End Sub The rest of the class overrides the methods in BindingList that control alteration of the collection. Each override checks the IsReadOnly property and throws an exception when an attempt is made to change the collection when it is in read-only mode. The only complicated overrides are ClearItems() and RemoveItem(). This is because AllowRemove is typically set to False and must be temporarily changed to True to allow the operation (when the collection is not in read-only mode). For instance, here s the ClearItems() method: Protected Overrides Sub ClearItems() If Not IsReadOnly Then Dim oldValue As Boolean = AllowRemove AllowRemove = True MyBase.ClearItems() AllowRemove = oldValue Else Throw New NotSupportedException(My.Resources.ClearInvalidException) End If End Sub The original AllowRemove value is restored after the operation is complete. This completes all the types in the Csla.Core namespace. The rest of the implementation is available in the code download for the book. Let s move on and discuss the types in the Csla.Validation namespace.
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