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Inside the constructor, we have a line that creates a $storage property for the instance, which will then be used to store the items for our table Because $storage is an object, we set it inside the constructor rather than in Tableprototype so that each table instance will have a unique storage object In order to make our Table constructor similar to native types, we need to give it the ability to be called as a regular function If you recall from earlier in this chapter, we found out that native constructors could be called as regular functions, and they either perform type casting or create new instances We ll follow the latter: if our Table constructor is called in conjunction with the new keyword, it ll act as a regular object constructor; otherwise, it ll return a new Table instance function Table(){ if (instanceOf(this, Table)){ this.

The dilemma arises because of the different abilities of class inheritance and composition to accommodate change in a domain. Class inheritance is more sensitive to change: it is statically defined at design time, and because a subclass implements functionality of the class hierarchy, it is additionally exposed to changes higher in the hierarchy. Composition, however, is less sensitive to change: it is defined at run time, and a consuming object may replace an object, at runtime, with a more suitable object.

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$storage = {}; } else { return new Table(); } }; We modified our constructor by adding an instanceOf check to see if the new keyword was used If our Table constructor was called with the new keyword, the value of this inside the function will be an instance of the Table type On the other hand, calling Table as a regular function sets the this keyword differently, so we ll need to instantiate and return a true instance of the Table type Now that the constructor is ready, all we need to do is turn it into a type object, and that s as simple as passing it to the Type constructor: function Table(){ if (instanceOf(this, Table)){ this$storage = {}; } else { return new Table(); }.

A key to the dilemma is to be aware that, generally, class inheritance is more sensitive to change than is composition. GoF propose a principle: Favor object composition over class inheritance. 1

As you have seen throughout this book, my philosophy is to show you the metadata first and then show you the code. Listing 12-1 shows the XML metadata for the Department table in the AdventureWorks database. As you can see in this example, the mapping metadata is similar to EF and LTS in that it contains class details such as properties and types and database details such as table names, column names, and attributes about nullability.

1. Gamma, Helm, Johnson, and Vlissides, Design Patterns: Elements of Reusable Object-Oriented Software

}; new Type('Table', Table); var table = new Table(); console.log(typeOf(table)); // 'table'

Listing 12-1. NHibernate Metadata Mapping Example < xml version="1.0" encoding="utf-8" > <hibernate-mapping xmlns="urn:nhibernate-mapping-2.0" assembly="AdventureWorks" namespace="AdventureWorks"> <class name="Department" table="Department"> <id name="Departmentid" column="DepartmentID" type="Int16" unsaved-value="0"> <generator class="native"/> </id> <bag name="EmployeeDepartmentHistoryList" inverse="true" lazy="true" > <key column="DepartmentID" /> <one-to-many class="EmployeeDepartmentHistory" /> </bag> <property column="Name" type="String" name="Name" not-null="true" length="50" /> <property column="GroupName" type="String" name="GroupName" not-null="true" length="50" /> <property column="ModifiedDate" type="DateTime" name="ModifiedDate" not-null="true" /> </class> </hibernate-mapping> Where there is mapping metadata, there is C# code. Listing 12-2 shows the C# class that would be associated with the metadata from Listing 12-1. This is a standard POCO class, as you have seen throughout the book. Listing 12-2. NHibernate Entity Class public class Department { private short _departmentid; private IList<EmployeeDepartmentHistory> EmployeeDepartmentHistoryList; private string _name; private string _groupname; private DateTime _modifieddate; // Required by NHibernate public Department(){} public virtual short Departmentid { get { return _departmentid; }

Listing 7-1 and Listing 7-2 demonstrate the difference between acquiring functionality through composition and inheritance, respectively. Listing 7-1. Composition class ModelT { ... //Model T is composed of these two objects private object aObject; private object bObject; ... //ModelT leverages functionality //of contained objects public string MethodOne() { return aObject.DoSomething(); } public string MethodTwo() { return bObject.DoSomethingElse(); } }

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