public class Mailbox
1: /**
2: A mailbox contains messages that can be listed, kept or discarded.
3: */
4: public class Mailbox
5: {
6: /**
7: Create Mailbox object.
8: @param aPasscode passcode number
9: @param aGreeting greeting string
10: */
11: public Mailbox(String aPasscode, String aGreeting)
12: {
13: passcode = aPasscode;
14: greeting = aGreeting;
15: newMessages = new MessageQueue();
16: keptMessages = new MessageQueue();
17: }
19: /**
20: Check if the entered supplied is correct.
21: @param aPasscode a passcode to check
22: @return true if the supplied passcode matches the mailbox passcode
23: */
24: public boolean checkPasscode(String aPasscode)
25: {
26: return aPasscode.equals(passcode);
27: }
29: /**
30: Add a message to the mailbox.
31: @param aMessage the message to be added
32: */
33: public void addMessage(Message aMessage)
34: {
35: newMessages.add(aMessage);
36: }
38: /**
39: Get the current message.
40: @return the current message
41: */
42: Message getCurrentMessage()
43: {
44: if (newMessages.getLength() > 0)
45: return newMessages.getHead();
46: else if (keptMessages.getLength() > 0)
47: return keptMessages.getHead();
48: else
49: return null;
50: }
52: /**
53: Remove the current message from the mailbox.
54: @return the message that has just been removed
55: */
56: public Message removeCurrentMessage()
57: {
58: if (newMessages.getLength() > 0)
59: return newMessages.remove();
60: else if (keptMessages.getLength() > 0)
61: return keptMessages.remove();
62: else
63: return null;
64: }
66: /**
67: Save the current message
68: */
69: public void saveCurrentMessage()
70: {
71: Message m = removeCurrentMessage();
72: if (m != null)
73: keptMessages.add(m);
74: }
76: /**
77: Change mailbox's greeting.
78: @param newGreeting the new greeting string
79: */
80: public void setGreeting(String newGreeting)
81: {
82: greeting = newGreeting;
83: }
85: /**
86: Change mailbox's passcode.
87: @param newPasscode the new passcode
88: */
89: public void setPasscode(String newPasscode)
90: {
91: passcode = newPasscode;
92: }
94: /**
95: Get the mailbox's greeting.
96: @return the greeting
97: */
98: String getGreeting()
99: {
100: return greeting;
101: }
103: private MessageQueue newMessages;
104: private MessageQueue keptMessages;
105: private String greeting;
106: private String passcode;
107: }