added basic services
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131446900f
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af8c80f216
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@ -1,5 +1,23 @@
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import services.AppConfigService;
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import services.DatabaseService;
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public class Main {
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public static void main(String[] args) {
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System.out.println("Hello world!");
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final App app = new App();
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app.run();
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}
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}
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class App {
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public App() {
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databaseService = new DatabaseService();
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appConfigService = new AppConfigService();
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}
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final DatabaseService databaseService;
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final AppConfigService appConfigService;
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public void run() {
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appConfigService.promptUserArguments();
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}
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}
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@ -0,0 +1,7 @@
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package constants;
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import java.text.SimpleDateFormat;
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public class ConstFormatters{
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final public static SimpleDateFormat APPLICATION_DATE_FORMATTER = new SimpleDateFormat("dd-MM-yyyy");
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}
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@ -0,0 +1,7 @@
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package constants;
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public class ConstValues {
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//I
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final public static String inputCountryName = "Enter country: ";
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final public static String inputDate = "Enter date: ";
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}
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@ -0,0 +1,44 @@
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package services;
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import constants.ConstFormatters;
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import constants.ConstValues;
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import java.text.ParseException;
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import java.util.Date;
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import java.util.Scanner;
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/**
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* Prompts and stores the configuration that the app needs to be run with.
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*/
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public class AppConfigService {
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String countryName;
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Date date;
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public void promptUserArguments() {
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final Scanner scanner = new Scanner(System.in);
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System.out.println(ConstValues.inputCountryName);
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countryName = scanner.nextLine();
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System.out.println();
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System.out.println(ConstValues.inputDate);
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while (true) {
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try {
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date = ConstFormatters.APPLICATION_DATE_FORMATTER.parse(scanner.nextLine());
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// Always using exact current date. Otherwise, different day possible at the start of the run.
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if (date.after(new Date())) {
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System.out.println("There is no data available for the future yet... Try again:");
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continue;
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}
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// Not doing anymore month/day validations.
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break;
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} catch (ParseException e) {
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System.out.printf("Unable to parse date. Should be in format '%s'.\nTry again:%n", ConstFormatters.APPLICATION_DATE_FORMATTER.toPattern());
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}
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}
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scanner.close();
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}
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}
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@ -0,0 +1,37 @@
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package services;
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import java.sql.Connection;
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import java.sql.DriverManager;
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import java.sql.SQLException;
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/**
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* Stores the active connection between the app and the local SQL Server.
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*/
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public class DatabaseService {
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private final String url = "jdbc:postgresql://localhost:5432/lunatech_covid";
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private final String user = "postgres";
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private final String password = "postgres";
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private final Connection connection;
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public DatabaseService() {
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connection = connect();
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}
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/**
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* Connect to the PostgreSQL database
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*
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* @return a Connection object
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*/
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private Connection connect() {
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Connection connection = null;
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try {
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connection = DriverManager.getConnection(url, user, password);
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System.out.println("Connected to the PostgreSQL server successfully.");
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} catch (SQLException e) {
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System.out.println(e.getMessage());
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}
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return connection;
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}
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}
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