c# barcode code 39 6: Creational Patterns: Abstract Factory and Builder in Visual C#

Generator USS Code 39 in Visual C# 6: Creational Patterns: Abstract Factory and Builder

6: Creational Patterns: Abstract Factory and Builder
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22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 } } // Interface IProductA interface IBag { string Material { get; } } // Interface IProductB interface IShoes { int Price { get; } } // All concrete ProductA's class Bag<Brand> : IBag where Brand : IBrand, new( ) { private Brand myBrand; public Bag( ) { myBrand = new Brand( ); } public string Material { get { return myBrand.Material; } } } // All concrete ProductB's class Shoes<Brand> : IShoes where Brand : IBrand, new( ) { private Brand myBrand; public Shoes( ) { myBrand = new Brand( ); } public int Price { get { return myBrand.Price; } } } // An interface for all Brands interface IBrand { int Price { get; } string Material { get; } } class Gucci : IBrand { public int Price { get { return 1000; } } public string Material { get { return "Crocodile skin"; } } } class Poochy : IBrand { public int Price { get { return new Gucci( ).Price / 3; } } public string Material { get { return "Plastic"; } } }
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73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 class Groundcover : IBrand { public int Price { get { return 2000; } } public string Material { get { return "South african leather"; } } } class Client<Brand> where Brand : IBrand, new( ) { public void ClientMain( ) //IFactory<Brand> factory) { IFactory<Brand> factory = new Factory<Brand>( ); IBag bag = factory.CreateBag( ); IShoes shoes = factory.CreateShoes( ); Console.WriteLine("I bought a Bag which is made from " + bag.Material); Console.WriteLine("I bought some shoes which cost " + shoes.Price); } } static class Program { static void Main( ) { // Call Client twice new Client<Poochy>( ).ClientMain( ); new Client<Gucci>( ).ClientMain( ); new Client<Groundcover>( ).ClientMain( ); } } } /* Output I bought a Bag which is made from Plastic I bought some shoes which cost 333 I bought a Bag which is made from Crocodile skin I bought some shoes which cost 1000 I bought a Bag which is made from South african leather I bought some shoes which cost 2000 */
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The IBrand interface is not a part of the original Abstract Factory pattern, but it does simplify adding new factories. Three different factories are included in this example to show that the generic implementation makes it very easy to add essential information about production without the need to write another Factory class. In this case, all that was needed to add Groundcover as a factory were lines 73 76. The output from running with all three factories in succession is shown in lines 101 106.
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As we have seen, the Abstract Factory pattern handles families of products and keeps their details independent from the clients. As such, it is ideal for generating different layouts and multiple-look-and-feel user interfaces. It can also be successfully applied for portability across operating systems, where the sense of what is required is the same open file, close window, etc. but the events and consequences differ.
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An oft-quoted limitation of the Abstract Factory pattern is that it is not easy to add new kinds of products. The number and names of the abstract products are coded directly into the abstract factory (see lines 9 10 in Example 6-1). Therefore, adding a new product requires the factory interface and all its subclassed concrete factories to be updated. Even the client needs to change to take advantage of the new addition. The Builder pattern, which we will discuss next, emphasizes extensibility over flexibility.
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Use the Abstract Factory pattern when A system should be independent of how its products are created, composed, and represented. A system can be configured with one of multiple families of products. The constraint requiring products from the same factory to be used together must be enforced. The emphasis is on revealing interfaces, not implementations.
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