TDDB84. Lecture 2. fredag 6 september 13

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1 TDDB84 Lecture 2

2 Yes, you can bring the books to the exam

3 Creational Factory method Structural Decorator Behavioral LE2

4 Creational Abstract Factory Singleton Builder Structural Composite Proxy Bridge Adapter Template method Behavioral Iterator Mediator Chain of responsibility Observer Observer LE3 LE4 LE5 LE6 Creational patterns Structural patterns LA1 LA2 LA3

5 Creational Abstract Factory Singleton Builder Structural Composite Proxy Bridge Adapter Behavioral Template method Iterator iteration over compound structures in Ruby & C# Mediator Chain of responsibility Observer Observer LE3 LE4 LE5 LE6 Creational patterns Structural patterns LA1 LA2 LA3

6 Creational Prototype Structural Facade Flyweight Behavioral Command Interpreter Visitor Memento LE7 LE8 LE9 Several different patterns GUI apps LA4 LA5

7

8 Joe, with the money earned from the duck simulator I bought a Pizza shop. I want to improve a little bit the service here. I m thinking that it would be great if one could order a pizza over the Internet

9 Joe, with the money earned from the duck simulator I bought a Pizza shop. I want to improve a little bit the service here. I m thinking that it would be great if one could order a pizza over the Internet

10 Joe, with the money earned from the duck simulator I bought a Pizza shop. I want to improve a little bit the service here. I m thinking that it would be great if one could order a pizza over the Internet

11 Joe, with the money earned from the duck simulator I bought a Pizza shop. I want to improve a little bit the service here. I m thinking that it would be great if one could order a pizza over the Internet

12 public Pizza orderpizza(string type) { Pizza pizza; } pizza = new CheesePizza(); pizza.prepare(); pizza.bake(); pizza.cut(); pizza.box(); return pizza; Clam Pizza? Veggie Pizza?

13 public Pizza orderpizza(string type) { Pizza pizza = null; } if (type.equals("cheese")) { pizza = new CheesePizza(); } else if (type.equals("pepperoni")) { pizza = new PepperoniPizza(); } else if (type.equals("clam")) { pizza = new ClamPizza(); } else if (type.equals("veggie")) { pizza = new VeggiePizza(); } pizza.prepare(); pizza.bake(); pizza.cut(); pizza.box(); return pizza;

14 public Pizza orderpizza(string type) { Pizza pizza = null; Remember... } if (type.equals("cheese")) { pizza = new CheesePizza(); } else if (type.equals("pepperoni")) { pizza = new PepperoniPizza(); } else if (type.equals("clam")) { pizza = new ClamPizza(); } else if (type.equals("veggie")) { pizza = new VeggiePizza(); } pizza.prepare(); pizza.bake(); pizza.cut(); pizza.box(); return pizza; Encapsulate what varies Program to an interface, not to an implementation Favor composition over inheritance

15 public Pizza orderpizza(string type) { Pizza pizza = null; Remember... } if (type.equals("cheese")) { pizza = new CheesePizza(); } else if (type.equals("pepperoni")) { pizza = new PepperoniPizza(); } else if (type.equals("clam")) { pizza = new ClamPizza(); } else if (type.equals("veggie")) { pizza = new VeggiePizza(); } pizza.prepare(); pizza.bake(); pizza.cut(); pizza.box(); return pizza; Encapsulate what varies Program to an interface, not to an implementation Favor composition over inheritance

16 Time for some code! Factory methods are not merely select/if statements, but configurations of collections of objects. Can be implemented differently in

17

18 Factory method Factory methods have been abstracted to dependency injection techniques instead, but the principle is the same

19

20 Decorator Decorators are usually seen as stream filters, where you add behavior and encapsulate an object.

21

22 Design principles Encapsulate what varies Program to an interface, not to an implementation Favor composition over inheritance Classes should be open for extension but closed for modification

23 Iterator Lecture N Lecture N+1

24 Iterator Lecture N Lecture N+1

25 Iterator Lecture N Lecture N+1 iteration over compound structures in Ruby & C#

26 Exam question:

27 What design pattern is the following code an example of? public class X implements Y { private ArrayList<Y> public boolean foo() { boolean v = true; } for (Y member : members) { v = v && member.foo(); } return v; } void addy(y y) { members.add(y); }

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