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ramalhoramalho
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adaptando examplo do HFDP
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‎.gitignore‎

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*.sublime-*
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# Byte-compiled / optimized / DLL files
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__pycache__/
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*.py[cod]

‎command/java/README.md‎

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# Head First Design Patterns
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Java code example from chapter 9 of the book [Head First Design Patterns](http://shop.oreilly.com/product/9780596007126.do) (O'Reilly, 2004) by **Eric Freeman**, **Elisabeth Robson**, **Bert Bates** and **Kathy Sierra**.
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‎command/java/menu/Menu.java‎

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package headfirst.composite.menu;
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import java.util.Iterator;
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import java.util.ArrayList;
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public class Menu extends MenuComponent {
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ArrayList menuComponents = new ArrayList();
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String name;
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String description;
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public Menu(String name, String description) {
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this.name = name;
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this.description = description;
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}
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public void add(MenuComponent menuComponent) {
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menuComponents.add(menuComponent);
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}
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public void remove(MenuComponent menuComponent) {
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menuComponents.remove(menuComponent);
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}
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public MenuComponent getChild(int i) {
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return (MenuComponent)menuComponents.get(i);
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}
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public String getName() {
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return name;
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}
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public String getDescription() {
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return description;
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}
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public void print() {
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System.out.print("\n" + getName());
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System.out.println(", " + getDescription());
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System.out.println("---------------------");
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Iterator iterator = menuComponents.iterator();
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while (iterator.hasNext()) {
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MenuComponent menuComponent =
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(MenuComponent)iterator.next();
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menuComponent.print();
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}
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}
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}

‎command/java/menu/MenuComponent.java‎

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package headfirst.composite.menu;
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import java.util.*;
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public abstract class MenuComponent {
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public void add(MenuComponent menuComponent) {
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throw new UnsupportedOperationException();
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}
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public void remove(MenuComponent menuComponent) {
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throw new UnsupportedOperationException();
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}
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public MenuComponent getChild(int i) {
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throw new UnsupportedOperationException();
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}
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public String getName() {
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throw new UnsupportedOperationException();
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}
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public String getDescription() {
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throw new UnsupportedOperationException();
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}
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public double getPrice() {
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throw new UnsupportedOperationException();
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}
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public boolean isVegetarian() {
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throw new UnsupportedOperationException();
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}
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public void print() {
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throw new UnsupportedOperationException();
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}
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}

‎command/java/menu/MenuItem.java‎

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package headfirst.composite.menu;
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import java.util.Iterator;
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import java.util.ArrayList;
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public class MenuItem extends MenuComponent {
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String name;
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String description;
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boolean vegetarian;
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double price;
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public MenuItem(String name,
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String description,
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boolean vegetarian,
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double price)
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{
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this.name = name;
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this.description = description;
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this.vegetarian = vegetarian;
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this.price = price;
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}
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public String getName() {
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return name;
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}
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public String getDescription() {
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return description;
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}
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public double getPrice() {
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return price;
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}
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public boolean isVegetarian() {
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return vegetarian;
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}
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public void print() {
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System.out.print(" " + getName());
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if (isVegetarian()) {
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System.out.print("(v)");
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}
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System.out.println(", " + getPrice());
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System.out.println(" -- " + getDescription());
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}
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}

‎command/java/menu/MenuTestDrive.java‎

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package headfirst.composite.menu;
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import java.util.*;
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public class MenuTestDrive {
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public static void main(String args[]) {
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MenuComponent pancakeHouseMenu =
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new Menu("PANCAKE HOUSE MENU", "Breakfast");
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MenuComponent dinerMenu =
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new Menu("DINER MENU", "Lunch");
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MenuComponent cafeMenu =
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new Menu("CAFE MENU", "Dinner");
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MenuComponent dessertMenu =
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new Menu("DESSERT MENU", "Dessert of course!");
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MenuComponent coffeeMenu = new Menu("COFFEE MENU", "Stuff to go with your afternoon coffee");
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MenuComponent allMenus = new Menu("ALL MENUS", "All menus combined");
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allMenus.add(pancakeHouseMenu);
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allMenus.add(dinerMenu);
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allMenus.add(cafeMenu);
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pancakeHouseMenu.add(new MenuItem(
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"K&B's Pancake Breakfast",
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"Pancakes with scrambled eggs, and toast",
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true,
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2.99));
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pancakeHouseMenu.add(new MenuItem(
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"Regular Pancake Breakfast",
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"Pancakes with fried eggs, sausage",
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false,
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2.99));
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pancakeHouseMenu.add(new MenuItem(
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"Blueberry Pancakes",
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"Pancakes made with fresh blueberries, and blueberry syrup",
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true,
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3.49));
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pancakeHouseMenu.add(new MenuItem(
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"Waffles",
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"Waffles, with your choice of blueberries or strawberries",
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true,
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3.59));
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dinerMenu.add(new MenuItem(
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"Vegetarian BLT",
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"(Fakin') Bacon with lettuce & tomato on whole wheat",
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true,
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2.99));
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dinerMenu.add(new MenuItem(
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"BLT",
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"Bacon with lettuce & tomato on whole wheat",
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false,
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2.99));
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dinerMenu.add(new MenuItem(
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"Soup of the day",
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"A bowl of the soup of the day, with a side of potato salad",
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false,
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3.29));
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dinerMenu.add(new MenuItem(
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"Hotdog",
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"A hot dog, with saurkraut, relish, onions, topped with cheese",
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false,
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3.05));
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dinerMenu.add(new MenuItem(
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"Steamed Veggies and Brown Rice",
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"Steamed vegetables over brown rice",
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true,
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3.99));
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dinerMenu.add(new MenuItem(
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"Pasta",
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"Spaghetti with Marinara Sauce, and a slice of sourdough bread",
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true,
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3.89));
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dinerMenu.add(dessertMenu);
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dessertMenu.add(new MenuItem(
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"Apple Pie",
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"Apple pie with a flakey crust, topped with vanilla icecream",
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true,
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1.59));
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dessertMenu.add(new MenuItem(
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"Cheesecake",
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"Creamy New York cheesecake, with a chocolate graham crust",
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true,
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1.99));
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dessertMenu.add(new MenuItem(
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"Sorbet",
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"A scoop of raspberry and a scoop of lime",
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true,
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1.89));
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cafeMenu.add(new MenuItem(
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"Veggie Burger and Air Fries",
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"Veggie burger on a whole wheat bun, lettuce, tomato, and fries",
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true,
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3.99));
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cafeMenu.add(new MenuItem(
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"Soup of the day",
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"A cup of the soup of the day, with a side salad",
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false,
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3.69));
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cafeMenu.add(new MenuItem(
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"Burrito",
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"A large burrito, with whole pinto beans, salsa, guacamole",
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true,
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4.29));
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cafeMenu.add(coffeeMenu);
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coffeeMenu.add(new MenuItem(
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"Coffee Cake",
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"Crumbly cake topped with cinnamon and walnuts",
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true,
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1.59));
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coffeeMenu.add(new MenuItem(
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"Bagel",
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"Flavors include sesame, poppyseed, cinnamon raisin, pumpkin",
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false,
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0.69));
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coffeeMenu.add(new MenuItem(
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"Biscotti",
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"Three almond or hazelnut biscotti cookies",
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true,
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0.89));
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Waitress waitress = new Waitress(allMenus);
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waitress.printMenu();
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}
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}

‎command/java/menu/Waitress.java‎

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package headfirst.composite.menu;
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import java.util.Iterator;
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public class Waitress {
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MenuComponent allMenus;
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public Waitress(MenuComponent allMenus) {
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this.allMenus = allMenus;
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}
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public void printMenu() {
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allMenus.print();
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}
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}

‎command/java/menuiterator/CompositeIterator.java‎

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package headfirst.composite.menuiterator;
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import java.util.*;
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public class CompositeIterator implements Iterator {
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Stack stack = new Stack();
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public CompositeIterator(Iterator iterator) {
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stack.push(iterator);
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}
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public Object next() {
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if (hasNext()) {
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Iterator iterator = (Iterator) stack.peek();
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MenuComponent component = (MenuComponent) iterator.next();
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if (component instanceof Menu) {
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stack.push(component.createIterator());
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}
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return component;
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} else {
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return null;
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}
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}
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public boolean hasNext() {
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if (stack.empty()) {
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return false;
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} else {
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Iterator iterator = (Iterator) stack.peek();
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if (!iterator.hasNext()) {
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stack.pop();
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return hasNext();
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} else {
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return true;
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}
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}
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}
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public void remove() {
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throw new UnsupportedOperationException();
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}
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}
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‎command/java/menuiterator/Menu.java‎

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package headfirst.composite.menuiterator;
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import java.util.Iterator;
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import java.util.ArrayList;
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public class Menu extends MenuComponent {
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ArrayList menuComponents = new ArrayList();
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String name;
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String description;
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public Menu(String name, String description) {
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this.name = name;
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this.description = description;
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}
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public void add(MenuComponent menuComponent) {
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menuComponents.add(menuComponent);
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}
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public void remove(MenuComponent menuComponent) {
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menuComponents.remove(menuComponent);
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}
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public MenuComponent getChild(int i) {
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return (MenuComponent)menuComponents.get(i);
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}
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public String getName() {
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return name;
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}
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public String getDescription() {
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return description;
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}
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public Iterator createIterator() {
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return new CompositeIterator(menuComponents.iterator());
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}
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public void print() {
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System.out.print("\n" + getName());
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System.out.println(", " + getDescription());
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System.out.println("---------------------");
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Iterator iterator = menuComponents.iterator();
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while (iterator.hasNext()) {
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MenuComponent menuComponent =
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(MenuComponent)iterator.next();
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menuComponent.print();
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}
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}
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}

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