package Question8_7;
import java.util.Date;
import java.util.HashMap;
/* UserManager serves as the central place for the core user actions. */
public class UserManager {
private static UserManager instance;
private HashMap<Integer, User> usersById = new HashMap<Integer, User>();
private HashMap<String, User> usersByAccountName = new HashMap<String, User>();
private HashMap<Integer, User> onlineUsers = new HashMap<Integer, User>();
public static UserManager getInstance() {
if (instance == null) {
instance = new UserManager();
}
return instance;
}
public void addUser(User fromUser, String toAccountName) {
User toUser = usersByAccountName.get(toAccountName);
AddRequest req = new AddRequest(fromUser, toUser, new Date());
toUser.receivedAddRequest(req);
fromUser.sentAddRequest(req);
}
public void approveAddRequest(AddRequest req) {
req.status = RequestStatus.Accepted;
User from = req.getFromUser();
User to = req.getToUser();
from.addContact(to);
to.addContact(from);
}
public void rejectAddRequest(AddRequest req) {
req.status = RequestStatus.Rejected;
User from = req.getFromUser();
User to = req.getToUser();
from.removeAddRequest(req);
to.removeAddRequest(req);
}
public void userSignedOn(String accountName) {
User user = usersByAccountName.get(accountName);
if (user != null) {
user.setStatus(new UserStatus(UserStatusType.Available, ""));
onlineUsers.put(user.getId(), user);
}
}
public void userSignedOff(String accountName) {
User user = usersByAccountName.get(accountName);
if (user != null) {
user.setStatus(new UserStatus(UserStatusType.Offline, ""));
onlineUsers.remove(user.getId());
}
}
}