public void test_component_demo()
{
ConcreteComponentA componentA = new ConcreteComponentA();
ConcreteComponentB componentB = new ConcreteComponentB();
ConcreteDecoratorA decoratorA = new ConcreteDecoratorA(componentA);
decoratorA.Operation();
decoratorA.SetComponent(componentB);
decoratorA.Operation();
}
static bool TestDecoratorPattern()
{
Console.WriteLine("TESTING THE DECORATOR DESIGN PATTERN: ");
ConcreteComponent comp = new ConcreteComponent();
ConcreteDecoratorA d1 = new ConcreteDecoratorA(comp);
ConcreteDecoratorB d2 = new ConcreteDecoratorB(d1);
comp.Operation();
//Output:
//Operation from ConcreteComponent
d1.Operation();
//Output:
//Operation from ConcreteComponent
//(AddedBehaviour A) + Operation from ConcreteDecoratorA
d2.Operation();
//Output:
//Operation from ConcreteComponent
//(AddedBehaviour A) + Operation from ConcreteDecoratorA
//(AddedBehaviour B) + Operation from ConcreteDecoratorB
return(true);
}
public void AddStateTest()
{
Component component = new ConcreteComponent();
component = new ConcreteDecoratorA(component);
Assert.That((component as ConcreteDecoratorA)?.AddedState == "added state");
Assert.That(() => component.Operation(),
Throws.Exception.With.Message.EqualTo("Operation from object of ConcreteComponent type"));
}
public static void TestDecorator()
{
IComponent component = new ConcreteComponent();
Console.WriteLine(component.Operation());
Decorator decorator = new ConcreteDecoratorA(component);
Console.WriteLine(decorator.Operation());
decorator = new ConcreteDecoratorB(decorator);
Console.WriteLine(decorator.Operation());
}
public static void test()
{
// Create ConcreteComponent and two Decorators
ConcreteComponent c = new ConcreteComponent("c");
Decorator a1 = new ConcreteDecoratorA("a1");
Decorator b1 = new ConcreteDecoratorA("b1");
Decorator a2 = new ConcreteDecoratorA("a2");
// Link decorators
a1.SetComponent(c);
b1.SetComponent(a1);
a2.SetComponent(b1);
a2.Operation();
}
public static void Main()
{
ConcreteComponent cc = new ConcreteComponent();
cc.Operation();
Console.WriteLine();
ConcreteDecoratorA cd1 = new ConcreteDecoratorA(cc);
cd1.Operation();
Console.WriteLine();
ConcreteDecoratorB cd2 = new ConcreteDecoratorB(cd1);
cd2.Operation();
Console.WriteLine();
Console.ReadKey();
}