|
EStore |
|
1 // joi/4/estore/EStore.java
2 //
3 //
4 // Copyright 2003 Bill Campbell and Ethan Bolker
5
6 /**
7 * An EStore object simulates the behavior of a simple on line
8 * shopping web site.
9 *
10 * It contains a Terminal object to model the customer's browser
11 * and a Catalog of Items that may be purchased and
12 * then added to the customer's shoppingCart.
13 *
14 * @version 4
15 */
16
17 public class EStore
18 {
19 private String storeName;
20 private Terminal browser;
21 private Catalog catalog;
22
23 /**
24 * Construct a new EStore.
25 *
26 * @param storeName the name of the EStore
27 * @param browser the visitor's Terminal.
28 */
29
30 public EStore( String storeName, Terminal browser )
31 {
32 this.browser = browser;
33 this.storeName = storeName;
34 this.catalog = new Catalog();
35 catalog.addItem( new Item("quaffle", 55) );
36 catalog.addItem( new Item("bludger", 15) );
37 catalog.addItem( new Item("snitch", 1000) );
38 }
39
40 /**
41 * Visit this EStore.
42 *
43 * Execution starts here when the store opens for
44 * business. User can visit as a customer, act as
45 * the manager, or exit.
46 */
47
48 public void visit()
49 {
50 // Print a friendly welcome message.
51 browser.println( "Welcome to " + storeName );
52 while (true) { // an infinite loop ...
53 browser.println();
54 String whoAreYou = browser.readWord(
55 storeName + " (manager, visit, exit): ");
56 if (whoAreYou.equals("exit")) {
57 break; // leave the while loop
58 }
59 if (whoAreYou.equals("manager")) {
60 managerVisit();
61 }
62 if (whoAreYou.equals("visit")) {
63 customerVisit();
64 }
65 }
66 }
67
68 /**
69 * Manager options:
70 *
71 * examine the catalog
72 * add an Item to the catalog
73 * quit
74 */
75 private void managerVisit( )
76 {
77 while (true) {
78 String cmd =
79 browser.readWord("manager command (show, new, quit):");
80 if (cmd.equals("quit")) {
81 break; // leave manager command while loop
82 }
83 else if (cmd.equals("show")) {
84 catalog.show(browser);
85 }
86 else if (cmd.equals("new")) {
87 String itemName = browser.readWord(" item name: ");
88 int cost = browser.readInt( " cost: ");
89 catalog.addItem( new Item(itemName, cost) );
90 }
91 else {
92 browser.println("unknown manager command: " + cmd);
93 }
94 }
95 }
96
97 /**
98 * Customer visits this EStore.
99 *
100 * Loop allowing customer to select items to add to her
101 * shoppingCart.
102 */
103
104 private void customerVisit( )
105 {
106 // Create a new, empty ShoppingCart.
107 ShoppingCart basket = new ShoppingCart();
108
109 browser.println( "Currently available:");
110 catalog.show(browser);
111 while ( true ) { // loop forever ...
112 String nextPurchase = browser.readWord(
113 "select your purchase, checkout, help: ");
114
115 if ( nextPurchase.equals("checkout" )) break; // leave loop!
116
117 if ( nextPurchase.equals("help" )) {
118 catalog.show(browser);
119 continue; // go back to top of while loop
120 }
121 // customer has entered the name of an Item
122 basket.addItem( catalog.getItem(nextPurchase) );
123 }
124
125 int numberPurchased = basket.getCount();
126 browser.println("We are shipping these " +
127 basket.getCount() + " Items:");
128 basket.showContents(browser);
129 browser.println("and charging your account $" + basket.getCost());
130 browser.println("Thank you for shopping at " + storeName);
131 }
132
133 /**
134 * The EStore simulation program begins here when the user
135 * issues the command <code>java EStore</code>
136 *
137 * If first command line argument is "-e" instantiate a
138 * Terminal that echoes its input.
139 *
140 * The next command line argument (if there is one)
141 * is the name of the EStore.
142 *
143 * @param args <-e> <storeName>
144 */
145 public static void main( String[] args )
146 {
147
148 String storeName = "Virtual Minimal Minimall"; //default
149
150 // check to see if first argument is "-e"
151 boolean echo = ( (args.length > 0) && (args[0].equals("-e")) );
152
153 // if first argument was "-e" then look at second for store name
154 int nextArg = (echo ? 1 : 0 );
155
156 if (args.length > nextArg) {
157 storeName = args[nextArg];
158 }
159
160 // Print this to simulate internet search.
161 System.out.println("connecting ...");
162
163 // Create an EStore object and visit it
164 (new EStore(storeName, new Terminal(echo))).visit();
165 }
166 }
167
|
EStore |
|