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Product Parts ------PartA PartB PartB Product Parts ------PartX PartY PartY
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The full program is shown in Example 6-2.
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1 using System; 2 using System.Collections.Generic; 3 4 // Builder Pattern Judith Bishop November 2007 5 // Simple theory code with one director and two builders 6 7 class Director { 8 // Build a Product from several parts 9 public void Construct(IBuilder builder) { 10 builder.BuildPartA( ); 11 builder.BuildPartB( ); 12 builder.BuildPartB( ); 13 } 14 } 15 16 interface IBuilder { 17 void BuildPartA( ); 18 void BuildPartB( ); 19 Product GetResult( ); 20 } 21 22 class Builder1 : IBuilder { 23 private Product product = new Product( ); 24 public void BuildPartA( ) { 25 product.Add("PartA "); 26 } 27 28 public void BuildPartB( ) { 29 product.Add("PartB "); 30 } 31 32 public Product GetResult( ) { 33 return product; 34 } 35 } 36 37 class Builder2 : IBuilder { 38 private Product product = new Product( ); 39 public void BuildPartA( ) { 40 product.Add("PartX "); 41 } 42 43 public void BuildPartB( ) {
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6: Creational Patterns: Abstract Factory and Builder
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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 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 product.Add("PartY "); } public Product GetResult( ) { return product; } } class Product { List <string> parts = new List <string> ( ); public void Add(string part) { parts.Add(part); } public void Display( ) { Console.WriteLine("\nProduct Parts -------"); foreach (string part in parts) Console.Write(part); Console.WriteLine( ); } } public class Client { public static void Main( ) { // Create one director and two builders Director director = new Director( ); IBuilder b1 = new Builder1( ); IBuilder b2 = new Builder2( ); // Construct two products director.Construct(b1); Product p1 = b1.GetResult( ); p1.Display( ); director.Construct(b2); Product p2 = b2.GetResult( ); p2.Display( ); } } /* Output Product Parts ------PartA PartB PartB Product Parts ------PartX PartY PartY */
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The example is very similar to that of the Abstract Factory pattern. The crucial difference is that the Director contains more functionality than the factories were required to. To illustrate, here is one of the two Directors from the code in Example 6-2:
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class Gucci : IBrand { public IBag CreateBag( ) { Bag b = new Bag( ); Program.DoWork("Cut Leather", 250); Program.DoWork("Sew leather", 1000); b.Properties += "Leather"; Program.DoWork("Create Lining", 500); Program.DoWork("Attach Lining", 1000); b.Properties += " lined"; Program.DoWork("Add Label", 250); b.Properties += " with label"; return b; } }
The DoWork method simulates the passing of time so that we can see that some products take longer than others to make. In lines 61 72 of Example 6-2, the Director for replica bags (lines 61 72) has fewer steps than that for Gucci bags (lines 46 49). Ultimately, as shown in the output, they are also produced faster. Example 6-3 shows the full example code.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 using using using using System; System.Diagnostics; System.IO; System.Threading;
namespace BuilderPattern { // Builder Pattern D-J Miller and Judith Bishop // Abstract Factory : Builder Implementation interface IBuilder<Brand> where Brand : IBrand { IBag CreateBag( ); } // Abstract Factory now the Builder class Builder<Brand> : IBuilder<Brand> where Brand : IBrand, new( ) { Brand myBrand; public Builder( ) { myBrand = new Brand( ); } public IBag CreateBag( ) { return myBrand.CreateBag( );
Sept 2007
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6: Creational Patterns: Abstract Factory and Builder
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 73 74 75 76 77 78 } } // Product 1 interface IBag { string Properties { get; set; } } // Concrete Product 1 class Bag : IBag { public string Properties { get; set; } }
// Directors interface IBrand { IBag CreateBag( ); } class Gucci : IBrand { public IBag CreateBag( ) { Bag b = new Bag( ); Program.DoWork("Cut Leather", 250); Program.DoWork("Sew leather", 1000); b.Properties += "Leather"; Program.DoWork("Create Lining", 500); Program.DoWork("Attach Lining", 1000); b.Properties += " lined"; Program.DoWork("Add Label", 250); b.Properties += " with label"; return b; } } class Poochy : IBrand { public IBag CreateBag( ) { Bag b = new Bag( ); Program.DoWork("Hire cheap labour", 200); Program.DoWork("Cut Plastic", 125); Program.DoWork("Sew Plastic", 500); b.Properties += "Plastic"; Program.DoWork("Add Label", 100); b.Properties += " with label"; return b; } } class Client<Brand> where Brand : IBrand, new( ) { public void ClientMain( ) //IFactory<Brand> factory) { IBuilder<Brand> factory = new Builder<Brand>( );
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