blather.model
Class UserDB

java.lang.Object
  blather.model.UserDB

All Implemented Interfaces:

java.io.Serializable

public class UserDB
extends java.lang.Object
implements java.io.Serializable

The UserDB maintains a database of users. That is, it provides a mapping from user names to BlatherUserInterface references.

See Also:

Serialized Form

Field Summary

static long

serialVersionUID

Constructor Summary

UserDB()

Method Summary

void	addUser(BlatherUserInterface b) Adds the given user to the user database.
BlatherUserInterface	getUser(java.lang.String username) Returns the user with the given username.
java.lang.String[]	listUserNames() Returns an array of all user names in the system.
boolean	userExists(java.lang.String username) Returns true if the user with the given name exists.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

serialVersionUID

public static final long serialVersionUID

See Also:

Constant Field Values

Constructor Detail

UserDB

public UserDB()

Method Detail

addUser

public void addUser(BlatherUserInterface b)

Adds the given user to the user database.

Parameters:

b - a reference to an instance of a class implementing BlatherUserInterface

getUser

public BlatherUserInterface getUser(java.lang.String username)

Returns the user with the given username. Precondition: the user with the given name exists.

Parameters:

username - a username

Returns:

a reference to an instance of a class implementing BlatherUserInterface

userExists

public boolean userExists(java.lang.String username)

Returns true if the user with the given name exists.

Parameters:

username - a username

Returns:

true if the user with the name username exists, false otherwise.

listUserNames

public java.lang.String[] listUserNames()

Returns an array of all user names in the system.

Returns:

an array of all user names in the system.