@Override
 public String[] getGroups() {
   String[] s = new String[perms.getGroupManager().getDefaultGroupSet().getGroups().size()];
   int i = 0;
   for (Group g : perms.getGroupManager().getDefaultGroupSet().getGroups()) {
     s[i] = g.getName();
     i++;
   }
   return s;
 }
 @Override
 public boolean groupHas(String world, String group, String permission) {
   GroupSet set = perms.getGroupManager().getWorldSet(Bukkit.getWorld(world));
   if (set.hasGroup(group)) {
     Group g = set.getGroup(group);
     return g.hasPermission(permission, true);
   } else {
     return false;
   }
 }
  @Override
  public String[] getPlayerGroups(String world, String player) {
    OfflinePlayer op = Bukkit.getOfflinePlayer(player);
    GroupSet set = perms.getGroupManager().getWorldSet(Bukkit.getWorld(world));
    User user = set.getUser(op);

    Set<Group> children = user.getChildren(true);
    List<String> groups = new ArrayList<String>();
    for (Group child : children) {
      groups.add(child.getName());
    }
    return groups.toArray(new String[groups.size()]);
  }
  @Override
  public boolean playerHas(String world, String player, String permission) {
    OfflinePlayer op = Bukkit.getOfflinePlayer(player);

    if (op.isOnline()) {
      Player p = (Player) op;
      if (p.getWorld().getName().equalsIgnoreCase(world)) {
        return p.hasPermission(permission);
      }
    }

    GroupSet set = perms.getGroupManager().getWorldSet(Bukkit.getWorld(world));
    Group user = set.getUser(op);
    return user.hasPermission(permission, true);
  }
  @Override
  public boolean groupAdd(String world, String group, String permission) {
    GroupManager gm = perms.getGroupManager();
    GroupSet set = gm.getWorldSet(Bukkit.getWorld(world));
    if (set.hasGroup(group)) {
      Group g = set.getGroup(group);

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

      for (User user : gm.getAffectedUsers(g)) {
        user.applyPermissions(gm.getFactory());
      }
      return true;
    } else {
      return false;
    }
  }