// examples and test class added, test stubs added 

import java.util.*;

// -----------------------------------------------------------------------------
// the entry point for the ordering process 
class Ordering {
    Vector /* Order */ open = new Vector(); 
    Vector /* Customer */ customers = new Vector(); 
    // --------------------------------------------
    
    Customer lookup(String name) { 
	return null; 
    }

    Order openOrder(Customer c) {
	Order o = new Order(c); 
	open.add(o); 
	return o; 
    }

    // add an order line to o
    void addLine(Order o, Product p, int q) {
	o.addLine(p,q); 
    }

    // compute the value of the order, write to file 
    int closeOrder(Order o) {
	return o.value(); 
    }

    // --------------------------------------------
    // Examples and Tests

    // no examples needed: only one exists (singleton pattern)

    public static void main(String argv) {
    }
}

// -----------------------------------------------------------------------------
// representing a customer 
class Customer {
    String name; 
    String address; 
    Customer(String name, String address) {
	this.name = name; 
	this.address = address; 
    }

    // --------------------------------------------
    // Examples 
    static Customer c1 = new Customer("Jonathan","Northeastern"); 
    static Customer c2 = new Customer("Matthias","Rice"); 
    static Customer c3 = new Customer("Robby","Chicago"); 
}

// -----------------------------------------------------------------------------
// representing an order 
class Order {
    Customer c; 
    Vector /* OrderLine */ lines = new Vector(); 
    // --------------------------------------------

    Order(Customer c) { 
	this.c = c; 
    }

    // add a line for p and q to the order
    void addLine(Product p, int q) {
	lines.add(new OrderLine(p,q)); 
    }

    // compute the value of the order 
    int value() {
	return 10; 
    }

    // ----------------------------------------------
    // Examples and Tests

    static Order o1 = new Order(Customer.c1); 

    public static void main(String argv) {
	// populate order 
	o1.addLine(Product.p1,10);
	o1.addLine(Product.p2,2);
	o1.addLine(Product.p2,1);
    }
}

// -----------------------------------------------------------------------------
// representing an orderline 
class OrderLine {
    Product p; 
    int q; 
    int value; 
    // --------------------------------------------

    OrderLine(Product p, int q) {
	this.p = p; 
	this.q = q; 
	value = p.price * q;  
    }

    // --------------------------------------------
    // Examples & Tests

    static OrderLine ol1 = new OrderLine(Product.p1,10);
    static OrderLine ol2 = new OrderLine(Product.p2,5);
    static OrderLine ol3 = new OrderLine(Product.p3,1);

    public static void main(String argv) {
    }
}

// -----------------------------------------------------------------------------
// representing a product 
class Product {
    String name; 
    String description; 
    int price; 
    // --------------------------------------------

    Product(String name, String description, int price) { 
	this.name = name; 
	this.description = description; 
	this.price = price; 
    }

    // --------------------------------------------
    // Examples 

    static Product p1 = new Product("salt","oh well",1); 
    static Product p2 = new Product("pepper","so so",2); 
    static Product p3 = new Product("jalapeno","yeap!",10); 
}

// -----------------------------------------------------------------------------
// a minimal test infrastructure 
class Tester {

    static int faults = 0; 

    static void check(String s, int i1, int i2) {
	check(s, new Integer(i1), new Integer(i2), i1==i2);
    }

    static void check(String s, Object o1, Object o2) {
	check(s, o1, o2, o1==o2);
    }

    static void check(String s, Object o1, Object o2, boolean t) {
	if (!t) {
	    faults += 1; 
	    System.out.println("*** test failed: " 
			       + s
			       + " got " 
			       + o1 
			       + " expected " 
			       + o2
			       + " *** "); 
	}
    }

    public static void main(String argv[]) {
	// calling all test methods in all classes
    }
}