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2: Structural Patterns: Decorator, Proxy, and Bridge
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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 Console.WriteLine(s+ c.Operation( )); } static void Main( ) { Console.WriteLine("Decorator Pattern\n"); IComponent component = new Component( ); Display("1. Basic component: ", component); Display("2. A-decorated : ", new DecoratorA(component)); Display("3. B-decorated : ", new DecoratorB(component)); Display("4. B-A-decorated : ", new DecoratorB( new DecoratorA(component))); // Explicit DecoratorB DecoratorB b = new DecoratorB(new Component( )); Display("5. A-B-decorated : ", new DecoratorA(b)); // Invoking its added state and added behavior Console.WriteLine("\t\t\t"+b.addedState + b.AddedBehavior( )); } } } /* Output Decorator Pattern 1. 2. 3. 4. 5. */ Basic component: I am walking A-decorated : I am walking and listening to Classic FM B-decorated : I am walking to school B-A-decorated : I am walking and listening to Classic FM to school A-B-decorated : I am walking to school and listening to Classic FM past the Coffee Shop and I bought a cappuccino
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The example starts off with the IComponent interface and a simple Component class that implements it (lines 9 17). There are two decorators that also implement the interface; each of them includes a declaration of an IComponent, which is the object it will decorate. DecoratorA (lines 19 31) is fairly plain and simply implements the Operation by calling it on the component it has stored, then adding something to the string it returns (line 28). DecoratorB (lines 33 50) is more elaborate. It also implements the Operation in its own way, but it offers some public addedState (line 35) and addedBehavior (lines 47 49) as well. In both implemented operations, the component s Operation method is called first, but this is not a requirement of the pattern; it merely makes for more readable output in this example. The Client class is responsible for creating components and decorators in various configurations and displaying the result of calling the Operation in each case. Cases 2 and 3 (lines 63 64) decorate the basic component in different ways, as shown in the output on lines 79 80. Cases 4 and 5 apply two decorators, a B and an A, in different orders. In cases 2 4, the decorator objects are instantiated and used immediately, then discarded. In case 5, we create a DecoratorB object and keep this instance in a variable of the same type (instead of IComponent), so we can invoke the new behavior:
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Decorator Pattern
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DecoratorB b = new DecoratorB(new Component( )); Display("5. A-B-decorated : ", new DecoratorA(b)); // Invoking its added state and added behavior Console.WriteLine("\t\t\t"+b.addedState + b.AddedBehavior( )); 5. A-B-decorated : I am walking to school and listening to Classic FM past the Coffee Shop and I bought a cappuccino
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There are three objects here: the explicitly declared b and the implicitly declared DecoratorA and Component objects. The Display method receives the DecoratorA object and invokes its Operation method (line 55). This takes it to the DecoratorB object. On line 42, the object that DecoratorB was composed with has its Operation invoked, and the basic string I am walking was returned (line 15). Continuing on, DecoratorB adds the bit about walking to school (line 43), and then DecoratorA adds listening to Classic FM (line 28). This completes the call to Display. As can be seen on line 82, the result is the opposite of line 81 because the decorators were composed in a different order. However, that is not all. Decorators can define new behavior, which can be invoked explicitly. We do this on line 71, which results in the second line of output (line 83) about buying a cappuccino. That, in a nutshell, is how decorators work. Decorators do not need any advanced language features; they rely on object aggregation and interface implementation. Now, let s consider a real-world example.
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