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Read-Only Business Objects
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Sometimes, an application may need an object that provides data in a read-only fashion. For a readonly list of data, there s ReadOnlyListBase; however, if the requirement is for a single object containing read-only data, it should inherit from ReadOnlyBase. This is one of the simplest types of objects to create, since it does nothing more than retrieve and return data, as shown here:
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CHAPTER 5 CSLA . NET OBJECT TEMPLATES
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[Serializable] public class ReadOnlyRoot : ReadOnlyBase<ReadOnlyRoot> { #region Business Methods // TODO: add your own fields, properties and methods // example with managed backing field private static PropertyInfo<int> IdProperty = RegisterProperty(typeof(ReadOnlyRoot), new PropertyInfo<int>("Id", "Id")); public int Id { get { return GetProperty(IdProperty); } } // example with private backing field private static PropertyInfo<string> NameProperty = RegisterProperty(typeof(ReadOnlyRoot), new PropertyInfo<string>("Name", "Name")); private string _name = NameProperty.DefaultValue; public string Name { get { return GetProperty(NameProperty, _name); } } #endregion #region Authorization Rules protected override void AddAuthorizationRules() { // TODO: add authorization rules //AuthorizationRules.AllowRead("Name", "Role"); } private static void AddObjectAuthorizationRules() { // TODO: add authorization rules //AuthorizationRules.AllowGet(typeof(ReadOnlyRoot), "Role"); } #endregion #region Factory Methods public static ReadOnlyRoot GetReadOnlyRoot(int id) { return DataPortal.Fetch<ReadOnlyRoot>( new SingleCriteria<ReadOnlyRoot, int>(id)); } private ReadOnlyRoot() { /* require use of factory methods */ }
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CH A PT ER 5 C SLA .NET O BJECT T EMPLAT ES
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#endregion #region Data Access private void DataPortal_Fetch(SingleCriteria<ReadOnlyRoot, int> criteria) { // TODO: load values } #endregion } Like other business objects, a read-only object will have either managed or private fields that contain its data. Typically, it will also have read-only properties or methods that allow client code to retrieve values. As long as they don t change the state of the object, these may even be calculated values. The AddAuthorizationRules() method only needs to add roles for read access, since no properties should be implemented to allow altering of data. Similarly, the AddObjectAuthorizationRules() method only needs to define the roles allowed to get the object. In the Factory Methods region, there s just one factory method that retrieves the object by calling DataPortal.Fetch(). The Data Access region just contains DataPortal_Fetch(). Of course, there s no need to support updating or deleting a read-only object. As with the editable root stereotype, you can use the ObjectFactory attribute to have the data portal invoke a Fetch() method from an object factory rather than invoke the DataPortal_Fetch() method in the business class directly.
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Read-Only Child Objects
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You create a read-only child object using the same code as that for a read-only root object. The only difference is how you handle the data portal and data access. [Serializable] public class ReadOnlyChild : ReadOnlyBase<ReadOnlyChild> { #region Business Methods // TODO: add your own fields, properties, and methods // example with managed backing field private static PropertyInfo<int> IdProperty = RegisterProperty(typeof(ReadOnlyRoot), new PropertyInfo<int>("Id", "Id")); public int Id { get { return GetProperty(IdProperty); } } // example with private backing field private static PropertyInfo<string> NameProperty = RegisterProperty(typeof(ReadOnlyRoot), new PropertyInfo<string>("Name", "Name")); private string _name = NameProperty.DefaultValue;
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CHAPTER 5 CSLA . NET OBJECT TEMPLATES
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public string Name { get { return GetProperty(NameProperty, _name); } } #endregion #region Factory Methods internal static ReadOnlyChild GetReadOnlyChild(object childData) { return DataPortal.FetchChild<ReadOnlyChild>(childData); } private ReadOnlyChild() { /* require use of factory methods */ } #endregion #region Data Access private void Child_Fetch(object childData) { // TODO: load values from childData } #endregion } As with a root object, a read-only child object should only have read-only properties. And as with an editable child, the factory method and data access method assume the parent object will be providing the pre-retrieved data needed to load the object s fields.
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Read-Only Collection
Applications commonly retrieve read-only collections of objects. The CSLA .NET framework includes the ReadOnlyListBase class to help create read-only collections. It throws an exception any time there s an attempt to change which items are in the collection by adding or removing objects.
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