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Builder Pattern |
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79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 DateTime date = DateTime.Now; Console.WriteLine("I want to buy a bag!"); IBag bag = factory.CreateBag( ); Console.WriteLine("I got my Bag which took " + DateTime.Now.Subtract(date).TotalSeconds * 5 + " days"); Console.WriteLine(" with the following properties " + bag.Properties+"\n"); } } static class Program { static void Main( ) { // Call Client twice new Client<Poochy>().ClientMain( ); new Client<Gucci>().ClientMain( ); } public static void DoWork(string workitem, int time) { Console.Write("" + workitem + ": 0%"); Thread.Sleep(time); Console.Write("....25%"); Thread.Sleep(time); Console.Write("....50%"); Thread.Sleep(time); Console.WriteLine("....100%"); } } } /* Output I want to buy a bag! Hire cheap labour: 0%....25%....50%....100% Cut Plastic: 0%....25%....50%....100% Sew Plastic: 0%....25%....50%....100% Add Label: 0%....25%....50%....100% I got my Bag which took 14.02016 days with the following properties Plastic with label I want to buy a bag! Cut Leather: 0%....25%....50%....100% Sew leather: 0%....25%....50%....100% Create Lining: 0%....25%....50%....100% Attach Lining: 0%....25%....50%....100% Add Label: 0%....25%....50%....100% I got my Bag which took 45.0648 days with the following properties Leather lined with label */
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6: Creational Patterns: Abstract Factory and Builder
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Use
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Builders can be found in applications that create complex structures. The result of a builder is often a composite.
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Use the Builder pattern when The algorithm for creating parts is independent from the parts themselves. The object to be assembled might have different representations. You need fine control over the construction process.
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Exercises
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1. A popular example of the Builder pattern is supplying a car with given characteristics. Suppose there is one car company that offers three models: economy, medium, and luxury. Write a nongeneric program that illustrates the pattern in this domain. The program should be able to handle different car models (products), and each model should offer different options for things such as wheels, upholstery, color, and air conditioning. 2. Use the Builder pattern to create a maze. The IBuilder interface should have methods such as BuildMaze, BuildRoom, BuildDoor, and GetMaze. Then create a StandardMazeBuilder and a DifficultMazeBuilder that implement the operations differently; for example, in the BuildRoom method, the StandardMaze could have two doors and the DifficultMaze between one and four doors. The client asks a director to create a maze builder of a given kind, and then to build the maze.
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Pattern Comparison
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The Builder and Abstract Factory patterns are similar in that they both look at construction at an abstract level. However, the Builder pattern is concerned with how a single object is made up by the different factories, whereas the Abstract Factory pattern is concerned with what products are made. The Builder pattern abstracts the algorithm for construction by including the concept of a director. The director is responsible for itemizing the steps and calls on builders to fulfill them. Directors do not have to conform to an interface.
Pattern Comparison |
A further elaboration on the theme of creating products is that instead of the client explicitly declaring fields of type ProductA and ProductB, say, the Product object the builder returns is actually a list of parts, which can have different lengths and contents depending on the director that was in charge at its creation. A comparison of the two patterns is given in Table 6-1.
Table 6-1. Comparison of Abstract Factory and Builder patterns Criteria Client aggregates Product creation is via Product creation invokes Factory/Builder returns Product has Abstract Factory A Factory and Products A factory CreateProductA A specific product Specific properties Builder A Director, Builders, and a Product A director Construct(builder) A part of a product A list of parts
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