public abstract class AbstractCommandExecutorRPT implements CommandExecutor {
    protected List<IOnSubCommand> commands = new LinkedList<>();

    @Override
    public boolean onCommand(CommandSender sender, Command command, String arg, String[] args) {
        Player p = null;

        if (sender instanceof Player) {
            p = (Player) sender;
        }

        for (IOnSubCommand cmd : commands) {
            if (cmd instanceof ICheckCommand) {
                if (!((ICheckCommand) cmd).checkCommand(command.getName())) {
                    continue;
                }
            }
            if (cmd.checkArgs(args)) {
                return cmd.onCommand(p, args);
            }
        }

        return false;
    }
}