GM Änderer

public class GameModeCommand implements CommandExecutor {

    @Override
    public boolean onCommand(CommandSender commandSender, Command command, String usedAlias, String[] args) {
        if (usedAlias.equalsIgnoreCase("gm") || usedAlias.equalsIgnoreCase("gamemode") || usedAlias.equalsIgnoreCase("spielmodus")){
            if (commandSender.hasPermission("eldo.essentials.gamemode")){
                Player target;
                if (args.length == 1 || args.length == 2){
                    if (args.length == 2){
                        target = Bukkit.getPlayerExact(args[1]);
                    } else {
                        target = null;
                    }
                    switch (args[0]){
                        case "1":
                        case "creative":
                        case "kreativ":
                            setGameMode(commandSender, GameMode.CREATIVE, target, args);
                            break;
                        case "0":
                        case "survival":
                        case "überleben":
                            setGameMode(commandSender, GameMode.SURVIVAL, target, args);
                            break;
                        case "2":
                        case "adventure":
                        case "abenteuer":
                            setGameMode(commandSender, GameMode.ADVENTURE, target, args);
                            break;
                        case "3":
                        case "spectator":
                        case "beobachter":
                            setGameMode(commandSender, GameMode.SPECTATOR, target, args);
                            break;
                        default:
                            EldoAPI.sendDefaultMessage(commandSender, DefaultMessage.WRONG_ARGUMENTS);
                            break;
                    }
                    return true;
                } else {
                    EldoAPI.sendDefaultMessage(commandSender, DefaultMessage.WRONG_ARGUMENTS);
                    return true;
                }
            } else {

                EldoAPI.sendDefaultMessage(commandSender, DefaultMessage.MISSING_PERMISSION);
                return true;
            }

        } else {
            if (args.length == 0){
                if(commandSender instanceof Player){
                    Player player = (Player) commandSender;
                    if(player.hasPermission("eldo.essentials.gamemode")){
                        switch (usedAlias) {
                            case "creative":
                            case "kreativ":
                            case "gm1":
                                setGameMode(player, GameMode.CREATIVE, null, args);
                                break;
                            case "survival":
                            case "überleben":
                            case "gm0":
                                setGameMode(player, GameMode.SURVIVAL, null, args);
                                break;
                            case "adventure":
                            case "abenteuer":
                            case "gm2":
                                setGameMode(player, GameMode.ADVENTURE, null, args);
                                break;
                            case "spectator":
                            case "beobachter":
                            case "gm3":
                                setGameMode(player, GameMode.SPECTATOR, null, args);
                                break;
                        }
                        return true;
                    } else {
                        EldoAPI.sendDefaultMessage(commandSender, DefaultMessage.MISSING_PERMISSION);
                        return true;
                    }
                } else {
                    EldoAPI.sendDefaultMessage(commandSender, DefaultMessage.ONLY_FOR_PLAYERS);
                    return true;
                }

            } else {
                System.out.println("args.legnth: " + args.length);
                //send message /creative /survival /spectator /adventure
                EldoAPI.sendDefaultMessage(commandSender, DefaultMessage.WRONG_ARGUMENTS);
                return true;
            }

        }

    }

    private void setGameMode(CommandSender commandSender, GameMode gameMode, Player target, String[] args){

        if (target != null){
            if(commandSender.hasPermission("eldo.essentials.gamemode.others")){
                target.setGameMode(gameMode);
                EldoAPI.sendSystemMessage(target, Cfg.ownGameModeChanged,
                        ReplacementFactory.createReplacement("gamemode", gameMode.name()));
                EldoAPI.sendSystemMessage(commandSender, Cfg.otherGameModeChanged,
                        ReplacementFactory.createReplacement("spieler", target.getName()),
                        ReplacementFactory.createReplacement("gamemode", gameMode.name()));
            } else {
                EldoAPI.sendDefaultMessage(commandSender, DefaultMessage.MISSING_PERMISSION);
            }
        } else {
            if (args.length == 2){
                EldoAPI.sendDefaultMessage(commandSender, DefaultMessage.PLAYER_NOT_ONLINE);
            } else if (commandSender instanceof Player){
                Player player = (Player) commandSender;
                player.setGameMode(gameMode);
                EldoAPI.sendSystemMessage(player, Cfg.ownGameModeChanged, ReplacementFactory.createReplacement("gamemode", gameMode.name()));
            } else {
                EldoAPI.sendDefaultMessage(commandSender, DefaultMessage.ONLY_FOR_PLAYERS);
            }
        }
    }
}