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The implementation of a simple Template Method program is shown in Example 7-5. It follows the UML of Figure 7-5, with the Algorithm containing the TemplateMethod and going through the IPrimitives interface to the two classes that implement it. In the main method, the Algorithm s Template Method is called with objects of ClassA and ClassB in turn, with different results. The TemplateMethod knows that it must call Operations on an object of type IPrimitives, but it does not have to know which class exactly.
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Template Method Pattern |
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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 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 using System; // Template Method Pattern Judith Bishop November 2007 // Shows two versions of the same algorithm interface IPrimitives { string Operation1( ); string Operation2( ); } class Algorithm { public void TemplateMethod(IPrimitives a) { string s = a.Operation1( ) + a.Operation2( ); Console.WriteLine(s); } } class ClassA : IPrimitives { public string Operation1( ) { return "ClassA:Op1 "; } public string Operation2( ) { return "ClassA:Op2 "; } } class ClassB : IPrimitives { public string Operation1( ) { return "ClassB:Op1 "; } public string Operation2( ) { return "ClassB.Op2 "; } } class TemplateMethodPattern { static void Main( ) { Algorithm m = new Algorithm( ); m.TemplateMethod(new ClassA( )); m.TemplateMethod(new ClassB( )); } } /* Output ClassA:Op1 ClassA:Op2 ClassB:Op1 ClassB.Op2 */
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7: Behavioral Patterns: Strategy, State, and Template Method
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Example
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Example 7-2 sorts integers for the Sorting Animator, but this is not built into the implementation. In the sort methods, the compare operations do not use the == operator, but rather the primitive operation CompareTo, as in:
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if (aux[j].CompareTo(aux[i]) == -1) {
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CompareTo is a method that returns 1 if a>b, 0 if a==b, and -1 if a<b. It is defined in the IComparable interface, which many predefined C# types already implement. For example, CompareTo is available for integers and strings. Because our sort methods are meant
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to be general, we declare that the item types must implement the interface using:
class MergeSorter<T> : SortStrategy<T> where T : IComparable<T> {
The where clause puts a constraint on the type <T> by saying it must implement IComparable. Any class can do so if it provides a CompareTo method. For example, inside a Person class, we might have:
// Comparison based on surnames public int CompareTo(object obj) { if(obj is Person) { Person p = (Person) obj; return Surname.CompareTo(p.Surname); } throw new ArgumentException("object is not a Person"); }
But how is CompareTo defined in terms of CompareTo Well, we are looking at names, so Surname will presumably be a string. CompareTo is defined for strings so that is what will be called. The check for the type of the object is necessary because the implementation of CompareTo must match its interface, which is defined on the object. When a Template Method uses an interface for specifying the primitive operations, the classes must implement those operations. It is also possible to define IPrimitives as an abstract class and to provide default behavior for any of the operations, leaving the subclass to override as many operations as it wishes. Methods that have defaults are called hook operations, and they often do nothing by default.
Use
Template Methods are, as we have seen, very useful in conjunction with the Strategy pattern. Any system that wishes to defer primitive operations to other classes will benefit from this pattern. In C#, it is used extensively through predefined interfaces such as IComparable.
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