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AcceptChanges() is actually the simplest of the three methods. If changes are being accepted, it means that the current values in the object are the ones that should be kept, and the most recent snapshot is now meaningless and can be discarded. Like CopyState(), once this method is complete, an Overridable AcceptChangesComplete() method is called to allow subclasses to take additional actions. In concept, this means that all AcceptChanges() needs to do is discard the most recent snapshot: mStateStack.Pop() However, it is important to remember that the object may have child objects, and they need to know to accept changes as well. This requires looping through the object s fields to find any child objects that implement Csla.Core.IUndoableObject. The AcceptChanges() method call must be cascaded to them, too. The process of looping through the fields of the object is the same as in CopyState() and UndoChanges(). The only difference is where the method call is cascaded: ' the field is undoable so see if it is editable If GetType(Csla.Core.IUndoableObject). _ IsAssignableFrom(field.FieldType) Then Dim value As Object = field.GetValue(Me) ' make sure the variable has a value If Not value Is Nothing Then ' it is a child object so cascade the call DirectCast(value, IUndoableObject).AcceptChanges() End If End If Simple field values don t need any processing. Remember that the idea is that the current values have been accepted so there s no need to change those current values at all.
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The next class listed in Table 3-1 is Csla.Core.BusinessBase. This class will implement most of the functionality for a single editable object, and combine the n-level undo, validation rules, and
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CHAPTER 3 s BUSINESS FRAMEWORK IMPLEMENTATION
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authorization rules, along with some data binding support. Given that the validation and authorization classes are later in the chapter, you may need to look forward in the chapter to see the full implementation of each feature. Like all base classes, this class must be serializable and MustInherit. It inherits from UndoableBase (and therefore also from BindableBase): Namespace Core <Serializable()> _ Public MustInherit Class BusinessBase Inherits UndoableBase Implements System.ComponentModel.IEditableObject Implements ICloneable Implements IDataErrorInfo Not only does this class inherit from UndoableBase, but it also implements System. ComponentModel.IEditableObject and System.ComponentModel.IDataErrorInfo to provide data binding support. It also implements System.ICloneable, and so the object will have a Clone() method. This class pulls together a lot of functionality. The goal is to abstract all this functionality into a set of easily understood behaviors that simplify the creation of business objects. Table 3-3 lists the functional areas. Table 3-3. Functional Areas Implemented in Csla.Core.BusinessBase
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Functional Area
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Tracking object status N-level undo
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Keeps track of whether the object is new, old, dirty, clean, or marked for deletion Provides access to the underlying n-level undo functionality implemented in UndoableBase, and implements the IEditableObject interface Implement behaviors so that the object can function as either a stand-alone object, a parent object, or a child of another object or collection Provide abstract access to the validation rules behavior (discussed later in the chapter) and implement the IDataErrorInfo interface Provide abstract access to the authorization rules behavior (discussed later in the chapter) Implements the ICloneable interface
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Root, parent, and child behaviors
Validation rules
Authorization rules Cloning
s Tip
Of course, there will also be code in BusinessBase to support data access a topic discussed in 4. In this chapter, the focus is on the behaviors that support the creation of the user interface and the implementation of non data access business logic.
Tracking Object Status
All editable business objects should keep track of whether the object has just been created, whether its data has been changed, or whether it has been marked for deletion. Using the validation rules functionality, the object can also keep track of whether it s valid. Table 3-4 lists the object status properties in BusinessBase.
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