import javax.swing.JOptionPane;
import java.text.NumberFormat;
import java.util.Locale;

//This example shows a combination of the decorator pattern and inheritance
//It is an adaptation of an example of Bruce Eckel

public class TestCoffeeShop1 {
    
    public TestCoffeeShop1() {
        DrinkItem aDrink;
        aDrink = new Cream(new Coffee());
        display(aDrink);
        aDrink = new Coffee();
        aDrink = new Cream(aDrink);
        aDrink = new Sugar(aDrink);
        aDrink = new Lemon(aDrink);
        display(aDrink);
        aDrink = new Cream(new Tea());
        display(aDrink);
        aDrink = new Coffee();
        display(aDrink);
    } // end TestCoffeeShop1
    
    public void display(DrinkItem d) {
        NumberFormat money = NumberFormat.getCurrencyInstance(Locale.US);
        String out = "Your drink is " + d.getDescription();
        out += "\nThe cost is " + money.format(d.getCost());
        JOptionPane.showMessageDialog(null,out);
    }
    
    interface DrinkItem {
        public double getCost();
        public String getDescription();
    }// end DrinkItem
    
    class Coffee implements DrinkItem {
        
        public double getCost() {
            return 1.99;
        }
        public String getDescription() {
            return "Coffee ";
        }
    }// end Coffee
    
    class Tea implements DrinkItem {
        
        public double getCost() {
            return 1.49;
        }
        
        public String getDescription() {
            return "Tea ";
        }
    }// end Tea
    
    class Decorator implements DrinkItem {
        private DrinkItem drink;
        
        public Decorator(DrinkItem drink) {
            this.drink = drink;
        }
        public DrinkItem getDrinkItem() {
            return drink;
        }
        public double getCost() {
            return drink.getCost();
        }
        public String getDescription() {
            return drink.getDescription();
        }
    }// end Decorator
    
    class Cream extends Decorator  {
        public Cream(DrinkItem d) {
            super(d);
        }
        public double getCost() {
            return getDrinkItem().getCost() + 0.25;
        }
        public String getDescription() {
            return getDrinkItem().getDescription() + "with cream ";
        }
    }// end Cream
    
    class Sugar extends Decorator {
        public Sugar(DrinkItem d) {
            super(d);
        }
        public double getCost() {
            return getDrinkItem().getCost() + 0.25;
        }
        public String getDescription() {
            return getDrinkItem().getDescription() + "with sugar ";
        }
    }// end Sugar
    
    class Lemon extends Decorator {
        public Lemon(DrinkItem d) {
            super(d);
        }
        public double getCost() {
            return getDrinkItem().getCost() + 0.10;
        }
        public String getDescription() {
            return getDrinkItem().getDescription() + "with lemon ";
        }
    }//end Lemon
    
    public static void main(String[] args) throws Exception {
        new TestCoffeeShop1();
        System.exit(0);
    }
} // end TestCoffeeShop