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Now the TaxEngine class needs to be fixed TaxEngine is responsible for instantiating TaxAccount, and thus to instantiate a Canadian TaxAccount, TaxEngine needs additional parameters, as follows: internal class TaxEngine : BaseTaxEngine { public override ITaxAccount CreateTaxAccount() { return new TaxAccount(ProvinceOntario, 2007); } } In the implementation of CreateTaxAccount(), the province Ontario and year 2007 are assumed Thus, whenever TaxEngine is instantiated, you need to make sure that the person is in Ontario and paying taxes for the year 2007 The implementation solves nothing and skirts the issue of having to figure out how to deal with someone paying their taxes in British Columbia and the year 2008 If you look at the implementation of TaxEngine, you will notice it is short One obvious solution would be to create a TaxEngine type for each province and each year.

In this exercise, you created the Product table and implemented (and enforced) a Many-to-Many relationship with Category Many-to-Many relationships are created by adding a third table, called a junction table, which is named ProductCategory in this case This table contains (ProductID, CategoryID) pairs, and each record in the table associates a particular product with a particular category So, if you see a record such as (1,4) in ProductCategory, you know that the product with ProductID 1 belongs to the category with CategoryID 4 The Many-to-Many relationship is physically enforced through two FOREIGN KEY constraints one that links Product to ProductCategory, and the other that links ProductCategory to Category In English, this means, One product can be associated with many product-category entries, each of those being associated with one category.

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Here are two examples: internal class Ontario2007TaxEngine : BaseTaxEngine { public override ITaxAccount CreateTaxAccount() { return new TaxAccount(ProvinceOntario, 2007); } } internal class BritishColumbia2008TaxEngine : BaseTaxEngine { public override ITaxAccount CreateTaxAccount() { return new TaxAccount(ProvinceBritishColumbia, 2008); } } This solution is not that bad, because to be able to instantiate the correct tax engine, you just need to define a factory that knows which class to instantiate But for the problem at hand, this solution is extremely tedious, as you could end up with hundreds, if not thousands, of TaxEngine definitions You would use the specific implementation approach when you have fewer than a dozen variations The better approach is to add an interface specific to the Canadian tax system Think of it as follows When you are instantiating the tax engine, you will need to know which tax system to use.

The foreign keys ensure that the products and categories that appear in the ProductCategory table actually exist in the database and won t allow you to delete a product if you have a category associated with it and vice versa This is also the first time that you set a primary key consisting of more than one column The primary key of ProductCategory is formed by both its fields: ProductID and CategoryID This means that you won t be allowed to have two identical (ProductID, CategoryID) pairs in the table However, it s perfectly legal to have a ProductID or CategoryID appear more than once, as long as it s part of a unique (ProductID, CategoryID) pair This makes sense, because you don t want to have two identical records in the ProductCategory table.

The factory protects you from needing to know which type to instantiate, but there is nothing wrong with giving some extra information that could be used by a factory Thus, the solution is to define a new interface called ICanadaTaxEngine The purpose of ICanadaTaxEngine is to add factory methods that are used to instantiate types with parameters specific to the implementation Following is the definition of the ICanadaTaxEngine public enum Province { Alberta, BritishColumbia, Manitoba, NewBrunswick, NewfoundlandLabrador,.

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