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/**

A mailbox contains messages that can be listed, kept or discarded.

*/

public class Mailbox

{

/**

Creates Mailbox object.

@param aPasscode passcode number

@param aGreeting greeting string

*/

public Mailbox(String aPasscode, String aGreeting)

{

passcode = aPasscode;

greeting = aGreeting;

newMessages = new MessageQueue();

keptMessages = new MessageQueue();

}

/**

Check if the passcode is correct.

@param aPasscode a passcode to check

@return true if the supplied passcode matches the mailbox passcode

*/

public boolean checkPasscode(String aPasscode)

{

return aPasscode.equals(passcode);

}

/**

Add a message to the mailbox.

@param aMessage the message to be added

*/

public void addMessage(Message aMessage)

{

newMessages.add(aMessage);

}

/**

Get the current message.

@return the current message

*/

public Message getCurrentMessage()

{

if (newMessages.size() > 0)

return newMessages.peek();

else if (keptMessages.size() > 0)

return keptMessages.peek();

else

return null;

}

/**

Remove the current message from the mailbox.

@return the message that has just been removed

*/

public Message removeCurrentMessage()

{

if (newMessages.size() > 0)

return newMessages.remove();

else if (keptMessages.size() > 0)

return keptMessages.remove();

else

return null;

}

/**

Save the current message

*/

public void saveCurrentMessage()

{

Message m = removeCurrentMessage();

if (m != null)

keptMessages.add(m);

}

/**

Change mailbox's greeting.

@param newGreeting the new greeting string

*/

public void setGreeting(String newGreeting)

{

greeting = newGreeting;

}

/**

Change mailbox's passcode.

@param newPasscode the new passcode

*/

public void setPasscode(String newPasscode)

{

passcode = newPasscode;

}

/**

Get the mailbox's greeting.

@return the greeting

*/

public String getGreeting()

{

return greeting;

}

private MessageQueue newMessages;

private MessageQueue keptMessages;

private String greeting;

private String passcode;

}