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CHAPTER 5 s COMPLETING THE FRAMEWORK
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Collectively, these properties and methods make it easy for a UI or business developer to use the name/value list to validate values and to translate between keys and values.
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As with the framework base classes from 3, the ICloneable interface is implemented. This is done using the Csla.ObjectCloner class: object ICloneable.Clone() { return GetClone(); } [EditorBrowsable(EditorBrowsableState.Advanced)] protected virtual object GetClone() { return Core.ObjectCloner.Clone(this); } public NameValueListBase<K, V> Clone() { return (NameValueListBase<K, V>)GetClone(); } The strongly typed Clone() method is public, while the loosely typed implementation can only be accessed through the ICloneable interface.
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The final functionality required is support for data access. As with all business objects, the data portal will be used to invoke an appropriate DataPortal_XYZ method. Since this base class only supports read-only lists, only the DataPortal_Fetch() method is marked as protected: protected virtual void DataPortal_Fetch(object criteria) { throw new NotSupportedException(Resources.FetchNotSupportedException); } This is comparable to the functionality added to BusinessBase or ReadOnlyBase in 4. The business developer must override or overload this method to implement the data access code that loads the name/value data from the database. As with the other CSLA .NET base classes, the DataPortal_OnDataPortalInvoke(), DataPortal_ OnDataPortalInvokeComplete(), and DataPortal_OnDataPortalException() methods are also declared as protected and virtual. The primary difference from the base class code added in 4 is that NameValueListBase also includes a protected criteria class: [Serializable()] protected class Criteria : CriteriaBase { public Criteria(Type collectionType) : base(collectionType) { } } The Csla.DataPortal.Fetch() method requires a criteria object as a parameter. At a minimum, that criteria object must provide the data portal with the type of the business object to be created.
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CHAPTER 5 s COMPLETING THE FRAMEWORK
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Normally, the type can be determined by looking at the class within which the criteria class is nested, because that is the business class itself. But in this case, the criteria class is nested inside the base class rather than the business class itself, so that technique won t work. The data portal would end up trying to instantiate an instance of NameValueListBase rather than the actual business class. This problem can be avoided because the Criteria class is a subclass of Csla.CriteriaBase. Remember that in 4 the data portal was designed to use CriteriaBase to find the specific type of business object to be created. The Criteria class has a constructor that requires the business developer to provide the type of the name/value list object to be created. In the following PaymentTerms example, the factory method uses this constructor when creating the Criteria object: public static PaymentTerms GetList() { return DataPortal.Fetch<PaymentTerms>( new Criteria(typeof(PaymentTerms))); } This ensures that the data portal knows that it is a PaymentTerms object that is to be created. This Criteria class works for the common case in which the entire set of name/value data is to be retrieved.
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If the business developer needs to retrieve a filtered list, he ll need to declare his own criteria class within his business class; just as for any other root business object.
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This concludes the NameValueListBase class. The framework now has all its base classes: BusinessBase, BusinessListBase, ReadOnlyBase, ReadOnlyListBase, CommandBase, and NameValueListBase. Together these provide base functionality to create most common types of business objects.
Custom Authentication
In 4, the data portal was implemented to support either Windows integrated (AD) or custom authentication. Either way, the result is that the current thread always has a valid principal object and associated identity object, allowing the authorization code from 3 to verify the user s roles as appropriate. When using custom authentication, the data portal requires that the custom principal object inherit from the Csla.Security.BusinessPrincipalBase class. A business application will implement its own principal and identity classes so it can authenticate the user and load the user s roles as appropriate for the application. The following shows a basic CustomPrincipal class (which makes use of a CustomIdentity class in the subsequent code): [Serializable()] public class CustomPrincipal : Csla.Security.BusinessPrincipalBase { private CustomPrincipal(IIdentity identity) : base(identity) { } public static bool Login(string username, string password) { CustomIdentity identity = CustomIdentity.GetIdentity(username, password); if (identity.IsAuthenticated)
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