@Override
  public boolean playerAdd(String world, String player, String permission) {
    OfflinePlayer op = Bukkit.getOfflinePlayer(player);
    GroupSet set = perms.getGroupManager().getWorldSet(Bukkit.getWorld(world));
    User user = set.getUser(op);

    boolean value = !permission.startsWith("^");
    permission = value ? permission : permission.substring(1);
    user.addPermission(permission, value, true, true);

    if (user.isActive()) {
      user.applyPermissions(perms.getGroupManager().getFactory());
    }
    return true;
  }
  @Override
  public boolean playerRemoveGroup(String world, String player, String group) {
    OfflinePlayer op = Bukkit.getOfflinePlayer(player);
    GroupSet set = perms.getGroupManager().getWorldSet(Bukkit.getWorld(world));
    User user = set.getUser(op);

    if (set.hasGroup(group)) {
      Group g = set.getGroup(group);
      if (user.hasChild(g, false)) {
        user.removeChild(g, true);

        if (user.isActive()) {
          user.applyPermissions(perms.getGroupManager().getFactory());
        }
        return true;
      } else {
        return false;
      }
    } else {
      return false;
    }
  }