// generics/Store.java
// (c)2017 MindView LLC: see Copyright.txt
// We make no guarantees that this code is fit for any purpose.
// Visit http://OnJava8.com for more book information.
// Building a complex model using generic collections
import java.util.*;
import java.util.function.*;
import onjava.*;

class Product {
 private final int id;
 private String description;
 private double price;
 Product(int idNumber, String descr, double price) {
 id = idNumber;
 description = descr;
 this.price = price;
 System.out.println(toString());
 }
 @Override
 public String toString() {
 return id + ": " + description +
 ", price: $" + price;
 }
 public void priceChange(double change) {
 price += change;
 }
 public static Supplier<Product> generator =
 new Supplier<Product>() {
 private Random rand = new Random(47);
 @Override
 public Product get() {
 return new Product(rand.nextInt(1000), "Test",
 Math.round(
 rand.nextDouble() * 1000.0) + 0.99);
 }
 };
}

class Shelf extends ArrayList<Product> {
 Shelf(int nProducts) {
 Suppliers.fill(this, Product.generator, nProducts);
 }
}

class Aisle extends ArrayList<Shelf> {
 Aisle(int nShelves, int nProducts) {
 for(int i = 0; i < nShelves; i++)
 add(new Shelf(nProducts));
 }
}

class CheckoutStand {}
class Office {}

public class Store extends ArrayList<Aisle> {
 private ArrayList<CheckoutStand> checkouts =
 new ArrayList<>();
 private Office office = new Office();
 public Store(
 int nAisles, int nShelves, int nProducts) {
 for(int i = 0; i < nAisles; i++)
 add(new Aisle(nShelves, nProducts));
 }
 @Override
 public String toString() {
 StringBuilder result = new StringBuilder();
 for(Aisle a : this)
 for(Shelf s : a)
 for(Product p : s) {
 result.append(p);
 result.append("\n");
 }
 return result.toString();
 }
 public static void main(String[] args) {
 System.out.println(new Store(5, 4, 3));
 }
}
/* Output: (First 8 Lines)
258: Test, price: 400ドル.99
861: Test, price: 160ドル.99
868: Test, price: 417ドル.99
207: Test, price: 268ドル.99
551: Test, price: 114ドル.99
278: Test, price: 804ドル.99
520: Test, price: 554ドル.99
140: Test, price: 530ドル.99
 ...
*/