OrderSystem.java

package core;

import java.util.ArrayList;
import java.util.Scanner;

/*
 * Design principles ideas to implement
 * - Reduce responsibility of this class, move excess functionality into different classes
 *   -> Order builder class, instead of building orders within this class
 *   -> Printer class?
 *   -> Reference number generator class?
 */

public class OrderSystem {
	
	/*
	 * The amount of orders that have been created by the system in this session.
	 */
	private int ordersCreated = 0;
	
	/*
	 * The order db that stores the information of all created orders.
	 */
	private static OrderDB db;
	
	public OrderSystem()
	{
		db = new OrderDB();
	}
	
	/*
	 * Utilises OrderBuilder class to construct a BrickOrder object
	 * using the number of bricks on the order, as a parameter.
	 * 
	 * Reference number is generated and is unique to the order that
	 * has been created. Reference number is returned by the method 
	 * after the BrickOrder object has been created and added into 
	 * the database of orders. 
	 */
	public String createOrder(int numBricks)
	{
		OrderBuilder builder = new OrderBuilder();
		BrickOrder o = builder.constructOrder(ordersCreated, numBricks);
		incOrdersCreated(); //To keep refNum unique to each order. 
		db.addOrder(o);
		System.out.println("Order ref " + o.getReferenceNumber() + " for " + o.getNumberOfBricks() + " bricks, created and added to DB.");
		return o.getReferenceNumber();
	}
	
	public String updateOrder(String refNum, int newNumBricks)
	{
		ArrayList<BrickOrder> orderList = db.getOrderList();
		
		for(BrickOrder o : orderList)
		{
			if(refNum.equals(o.getReferenceNumber()))
			{
				o.setNumberOfBricks(newNumBricks);
				System.out.println("Order " + refNum + " details updated to " + newNumBricks + " bricks.");
				return o.getReferenceNumber();
			}
		}
		
		return "No order with reference number " + refNum + " in database.";
	}
	
	
	/*
	 * Return a specific order from the database using a reference number
	 */
	public BrickOrder getOrder(String refNum)
	{
		return db.getOrder(refNum);
	}
	
	/*
	 * Return all of the orders in the database in the form of an ArrayList
	 */
	public ArrayList<BrickOrder> getOrders()
	{
		return db.getOrderList();
	}
	
	/*
	 * Print the details of all orders present in the database to the console. 
	 */
	public void printAllOrders()
	{
		ArrayList<BrickOrder> orderList = db.getOrderList();
		Printer pr = new Printer();
		pr.printOrderList(orderList);
	}
	
	/*
	 * Remove a specific order from the database using a reference number.
	 */
	public void removeOrder(String refNum)
	{
		db.removeOrder(refNum);
	}
	
	/*
	 * Return the number of orders created in this session. 
	 */
	public int getOrdersCreated()
	{
		return ordersCreated;
	}
	
	/*
	 * Increments the value of ordersCreated
	 */
	private void incOrdersCreated()
	{
		ordersCreated++;
	}
	
	/*
	 * Returns a reference to the db.
	 */
	public OrderDB getDb()
	{
		return db;
	}
	
}