ssd3 exercise6

import java.io.*; /** * This class implements a gourmet coffee system. * * @author Michael * @version 1.1.0 * @see Product * @see Coffee * @see CoffeeBrewer * @see Catalog * @see OrderItem * @see Order * @see SalesFormatter * @see PlainTextSalesFormatter * @see HTMLSalesFormatter * @see XMLSalesFormatter * @see CatalogLoader * @see FileCatalogLoader */ public class GourmetCoffee { private static BufferedReader stdIn = new BufferedReader( new InputStreamReader(System.in)); private static PrintWriter stdOut = new PrintWriter(System.out, true); private static PrintWriter stdErr = new PrintWriter(System.err, true); private Catalog catalog; private Sales sales; private SalesFormatter salesFormatter; /** * Loads catalog data from a file and starts the application. * <p> * The name of the file is specified in the command arguments. * </p> * * @param args * String arguments. * @throws IOException * if there are errors in the input. */ public static void main(String[] args) throws IOException { Catalog catalog = null; if (args.length != 1) { stdErr.println("Usage: java GourmetCoffee filename"); } else { try { catalog = (new FileCatalogLoader()).loadCatalog(args[0]); } catch (FileNotFoundException fnfe) { stdErr.println("The file does not exist"); System.exit(1); } catch (DataFormatException dfe) { stdErr.println("The file contains malformed data: " + dfe.getMessage()); System.exit(1); } GourmetCoffee application = new GourmetCoffee(catalog); application.run(); } } /** * Constructs a <code>GourmetCoffee</code> object. Initializes the catalog * data with the value specified in the parameter. * * @param initialCatalog * a product catalog */ private GourmetCoffee(Catalog initialCatalog) { this.catalog = initialCatalog; this.sales = new Sales(); this.salesFormatter = PlainTextSalesFormatter.getSingletonInstance(); loadSales(); } /** * Initializes the sales object. */ private void loadSales() { Order orderOne = new Order(); Product productOne = this.catalog.getProduct("C001"); if (productOne != null) { orderOne.addItem(new OrderItem(productOne, 5)); this.sales.addOrder(orderOne); } Order orderTwo = new Order(); Product productTwo = this.catalog.getProduct("C002"); Product productThree = this.catalog.getProduct("A001"); if ((productTwo != null) && (productThree != null)) { orderTwo.addItem(new OrderItem(productTwo, 2)); orderTwo.addItem(new OrderItem(productThree, 2)); this.sales.addOrder(orderTwo); } Order orderThree = new Order(); Product productFour = this.catalog.getProduct("B002"); if (productFour != null) { orderThree.addItem(new OrderItem(productFour, 1)); this.sales.addOrder(orderThree); } } /** * Presents the user with a menu of options and executes the selected task. */ private void run() throws IOException { int choice = getChoice(); while (choice != 0) { if (choice == 1) { displayCatalog(); } else if (choice == 2) { this.salesFormatter = PlainTextSalesFormatter .getSingletonInstance(); writeFile(readFilename(), this.salesFormatter .formatSales(this.sales)); } else if (choice == 3) { this.salesFormatter = HTMLSalesFormatter.getSingletonInstance(); writeFile(readFilename(), this.salesFormatter .formatSales(this.sales)); } else if (choice == 4) { this.salesFormatter = XMLSalesFormatter.getSingletonInstance(); writeFile(readFilename(), this.salesFormatter .formatSales(this.sales)); } choice = getChoice(); } } /** * Displays a menu of options and verifies the user's choice. * * @return an integer in the range [0,7] */ private int getChoice() throws IOException { int input; do { try { stdErr.println(); stdErr.print("[0] Quit\n" + "[1] Display Catalog\n" + "[2] Save sales (Plain Text)\n" + "[3] Save sales (HTML)\n" + "[4] Save sales (XML)\n" + "choice> "); stdErr.flush(); input = Integer.parseInt(stdIn.readLine()); stdErr.println(); if (0 <= input && 4 >= input) { break; } else { stdErr.println("Invalid choice: " + input); } } catch (NumberFormatException nfe) { stdErr.println(nfe); } } while (true); return input; } /** * Displays the catalog. */ private void displayCatalog() { int size = this.catalog.getNumberOfProducts(); if (size == 0) { stdErr.println("The catalog is empty"); } else { for (Product product : this.catalog) { stdOut.println(product.getCode() + " " + product.getDescription()); } } } /** * Creates a new file (which has the specified name) and writes the * specified string to the new file. * * @param filename * name of the file that will store the data * @param content * data to be stored * @throws IOException * if there are errors in the input. */ private void writeFile(String filename, String content) throws IOException { /* PLACE YOUR CODE HERE */ PrintWriter fileOut = new PrintWriter(new FileWriter(filename)); fileOut.println(content); fileOut.close(); } /** * Prompts the user for a filename (the name of the file that will store the * sales information) and returns the user's response. * * @return name of a file */ private String readFilename() throws IOException { stdErr.print("Filename> "); stdErr.flush(); return stdIn.readLine(); } }