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As defined, the Context aggregates an object of the chosen Strategy type. Generally, it will only have access to the main method that the algorithm requires. If it needs more information from the Strategy, this should be included in the IStrategy interface. On the other hand, the Strategy will need to work within the Context and access its state.
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The theory code for the Strategy pattern (Example 7-1) does not need any new C# 3.0 features. It relies on aggregation of the IStrategy interface in the Context (line 13). The client calls the Algorithm method on the Context (line 59), and it is routed through to the method of the strategy applicable at the time. In this example, the strategies have Move methods that count up and down. A random number generated in the client determines when to switch from counting up to counting down. The resulting output is shown in line 65.
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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 26 27 28 29 30 31 32 33 using System; // Strategy Pattern Judith Bishop Oct 2007 // Shows two strategies and a random switch between them // The Context class Context { // Context state public const int start = 5; public int Counter = 5; // Strategy aggregation IStrategy strategy = new Strategy1( ); // Algorithm invokes a strategy method public int Algorithm( ) { return strategy.Move(this); } // Changing strategies public void SwitchStrategy( ) { if (strategy is Strategy1) strategy = new Strategy2( ); else strategy = new Strategy1( ); } } // Strategy interface interface IStrategy { int Move (Context c); }
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7: Behavioral Patterns: Strategy, State, and Template Method
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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 // Strategy 1 class Strategy1 : IStrategy { public int Move (Context c) { return ++c.Counter; } } // Strategy 2 class Strategy2 : IStrategy { public int Move (Context c) { return --c.Counter ; } } // Client static class Program { static void Main ( ) { Context context = new Context( ); context.SwitchStrategy( ); Random r = new Random(37); for (int i=Context.start; i<=Context.start+15; i++) { if (r.Next(3) == 2) { Console.Write("|| "); context.SwitchStrategy( ); } Console.Write(context.Algorithm( ) +" "); } Console.WriteLine( ); } } /* Output 4 || 5 6 7 || 6 || 7 8 9 10 || 9 8 7 6 || 7 || 6 */
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Some key points about the implementation of the Strategy pattern are: The Context will often contain a switch statement or a cascading if statement, where information is processed to reach a decision on which Strategy to adopt. If the strategies are simple methods, they can be implemented without enclosing classes, and the delegate mechanism can be used to hook the chosen Strategy into the Context at runtime. Extension methods can be used to define new strategies independently of the original classes that they support.
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Example: Sorting Animator
The program that produces the animations in Figure 7-1 is shown in Example 7-2. Consider first the Context (lines 61 86). ButtonClick is activated from the GUI and, based on the button clicked, will decide on a strategy to follow. In other words, it will select one of the available strategy classes and instantiate it. After generating data from the class at line 15 (not shown in full here), it activates the GUI window and starts the sort. We don t show the full sorting algorithms here, only the interaction with the Context (see lines 96 112 for Mergesort). Input is the list that is being sorted, and the algorithms contain strategic calls to update the user interface through the UpdateUI event.
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 26 27 28 29 30 31 32 33 34 35 36 37 38 39 using using using using using using System; System.Collections.Generic; System.Linq; System.Windows.Forms; System.Drawing; System.Threading;
namespace Strategy { // // // // Strategy Pattern Judith Bishop and D-J Miller Sept 2007 Gives a choice of sort routines to display Algorithms and GUI adapted from a Java system at http://www.geocities.com/SiliconValley/Network/1854/Sort1.html
static class StartSetGenerator { private static List<int> myList; public static IEnumerable<int> GetStartSet( ) { // omitted } class StrategyView<T> : Form where T : IComparable<T> { PictureBox pb; Func<IEnumerable<T>> Generator; // Constructor to set up the GUI public StrategyView(Func<IEnumerable<T>> generator) { // omitted public void DrawGraph(IEnumerable<T> list) { if (pb.Image == null) pb.Image = new Bitmap(pb.Width, pb.Height); Graphics g = Graphics.FromImage(pb.Image); g.Clear(Color.White); g.DrawRectangle(Pens.Blue, 19, 19, 202, 202); g.Dispose( ); Bitmap b = pb.Image as Bitmap;
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