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Matthew Patterson has over 20 years of work experience. Matthew started their career in 1997 as a Junior Programmer at Motorola. Matthew then worked as an Imaging Systems Programmer and Computer Tech Level III at Walmart. In 1998 they worked as a Web Application Developer/DBA at Wolf Camera Inc. In 2000 they were a Senior Programmer/Team Lead at WolfXpress.com. From 2001 to 2008 they worked at Intervolve in various roles such as Software Architect/Lead Developer, Senior Programmer and Development Manager. From 2009 to 2015 they worked at PracticeAdmin as Chief Software Architect and at LocumsMart as CTO and Senior Software Architect.

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package com.mycompany.dao;

import com.mycompany.dto.Order;

import java.io.BufferedReader;

import java.io.FileNotFoundException;

import java.io.FileReader;

import java.io.FileWriter;

import java.io.IOException;

import java.io.PrintWriter;

import java.util.ArrayList;

import java.util.HashMap;

import java.util.List;

import java.util.Map;

import java.util.Scanner;

/**

*

* @author apprentice

*/

public class OrderDaoImpl implements OrderDao {

private Map<Integer, Order> orders = new HashMap<>();

public static final String ORDER_FILE = "orders.txt";

public static final String DELIMITER = "::";

@Override

public Order create(Order order) {

Order newOrder = orders.put(order.getOrderNumber(), order);

writeOrder();

return newOrder;

}

@Override

public Order get(Integer orderNumber) {

return orders.get(orderNumber);

}

@Override

public void update(Order order) {

orders.put(order.getOrderNumber(), order);

writeOrder();

}

@Override

public void delete(Order order) {

orders.remove(order.getOrderNumber());

writeOrder();

}

@Override

public List<Order> list() {

return new ArrayList<Order>(orders.values());

}

private void loadOrder() {

Scanner scanner;

try {

scanner = new Scanner(new BufferedReader(new FileReader(ORDER_FILE)));

} catch (FileNotFoundException e) {

throw new PersistenceException("Could not load order data into memory", e);

}

String currentLine;

String[] currentTokens;

while (