/**
   * Adds the new user to others roster.
   *
   * @param newUser the new user
   * @param otherItem the other item
   * @param currentUser the current user
   * @throws ServiceException the service exception
   */
  private static void addNewUserToOthersRoster(
      User newUser, RosterItem otherItem, String currentUser) throws ServiceException {
    otherItem.getJid();
    UserManager userManager = UserManager.getInstance();

    // Is this user registered with our OF server?
    String username = otherItem.getJid().getNode();
    if (username != null
        && username.length() > 0
        && userManager.isRegisteredUser(username)
        && XMPPServer.getInstance()
            .isLocal(XMPPServer.getInstance().createJID(currentUser, null))) {
      try {
        User otherUser = userManager.getUser(username);
        Roster otherRoster = otherUser.getRoster();
        RosterItem oldUserOnOthersRoster =
            otherRoster.getRosterItem(XMPPServer.getInstance().createJID(currentUser, null));

        try {
          if (!oldUserOnOthersRoster.isOnlyShared()) {

            RosterItem justCreated =
                otherRoster.createRosterItem(
                    XMPPServer.getInstance().createJID(newUser.getUsername(), null),
                    oldUserOnOthersRoster.getNickname(),
                    oldUserOnOthersRoster.getGroups(),
                    true,
                    true);
            justCreated.setAskStatus(oldUserOnOthersRoster.getAskStatus());
            justCreated.setRecvStatus(oldUserOnOthersRoster.getRecvStatus());
            justCreated.setSubStatus(oldUserOnOthersRoster.getSubStatus());
            otherRoster.updateRosterItem(justCreated);
          }
        } catch (UserAlreadyExistsException e) {
          throw new ServiceException(
              "Could not create roster item for user ",
              newUser.getUsername(),
              ExceptionType.USER_ALREADY_EXISTS_EXCEPTION,
              Response.Status.CONFLICT,
              e);
        } catch (SharedGroupException e) {
          throw new ServiceException(
              "Could not create roster item, because it is a contact from a shared group",
              newUser.getUsername(),
              ExceptionType.USER_ALREADY_EXISTS_EXCEPTION,
              Response.Status.BAD_REQUEST,
              e);
        }
      } catch (UserNotFoundException e) {
        throw new ServiceException(
            "Could not create roster item for user "
                + newUser.getUsername()
                + "  because it is a contact from a shared group.",
            newUser.getUsername(),
            ExceptionType.USER_NOT_FOUND_EXCEPTION,
            Response.Status.NOT_FOUND,
            e);
      }
    }
  }
  /**
   * Copy roster.
   *
   * @param currentUser the current user
   * @param newUser the new user
   * @param currentUserName the current user name
   * @throws ServiceException the service exception
   */
  private static void copyRoster(User currentUser, User newUser, String currentUserName)
      throws ServiceException {
    Roster newRoster = newUser.getRoster();
    Roster currentRoster = currentUser.getRoster();
    for (RosterItem item : currentRoster.getRosterItems()) {
      try {
        List<String> groups = item.getGroups();

        RosterItem justCreated =
            newRoster.createRosterItem(item.getJid(), item.getNickname(), groups, true, true);
        justCreated.setAskStatus(item.getAskStatus());
        justCreated.setRecvStatus(item.getRecvStatus());
        justCreated.setSubStatus(item.getSubStatus());

        for (Group gr : item.getSharedGroups()) {
          justCreated.addSharedGroup(gr);
        }

        for (Group gr : item.getInvisibleSharedGroups()) {
          justCreated.addInvisibleSharedGroup(gr);
        }
        newRoster.updateRosterItem(justCreated);
        addNewUserToOthersRoster(newUser, item, currentUserName);

      } catch (UserAlreadyExistsException e) {
        throw new ServiceException(
            "Could not create roster item for user ",
            newUser.getUsername(),
            ExceptionType.USER_ALREADY_EXISTS_EXCEPTION,
            Response.Status.CONFLICT,
            e);
      } catch (SharedGroupException e) {
        throw new ServiceException(
            "Could not create roster item, because it is a contact from a shared group",
            newUser.getUsername(),
            ExceptionType.USER_ALREADY_EXISTS_EXCEPTION,
            Response.Status.BAD_REQUEST,
            e);
      } catch (UserNotFoundException e) {
        throw new ServiceException(
            "Could not update roster item for user "
                + newUser.getUsername()
                + " because it was not properly created.",
            newUser.getUsername(),
            ExceptionType.USER_NOT_FOUND_EXCEPTION,
            Response.Status.NOT_FOUND,
            e);
      }
    }
  }
 /**
  * Determine and call the update method based on the item's subscription state. The method also
  * turns the action and sending status into an integer code for easier processing (switch
  * statements).
  *
  * <p>Code relies on states being in numerical order without skipping. In addition, the receive
  * states must parallel the send states so that (send state X) + STATE_RECV_SUBSCRIBE == (receive
  * state X) where X is subscribe, subscribed, etc.
  *
  * @param item The item to be updated
  * @param action The new state change request
  * @param isSending True if the roster owner of the item is sending the new state change request
  */
 private static void updateState(RosterItem item, Presence.Type action, boolean isSending) {
   Map<String, Map<Presence.Type, Change>> srTable = stateTable.get(item.getSubStatus());
   Map<Presence.Type, Change> changeTable = srTable.get(isSending ? "send" : "recv");
   Change change = changeTable.get(action);
   if (change.newAsk != null && change.newAsk != item.getAskStatus()) {
     item.setAskStatus(change.newAsk);
   }
   if (change.newSub != null && change.newSub != item.getSubStatus()) {
     item.setSubStatus(change.newSub);
   }
   if (change.newRecv != null && change.newRecv != item.getRecvStatus()) {
     item.setRecvStatus(change.newRecv);
   }
 }