BauSystem/src/de/steamwar/bausystem/commands/CommandGamemode.java

package de.steamwar.bausystem.commands;

import com.google.common.collect.ImmutableList;
import de.steamwar.bausystem.BauSystem;
import de.warking.hunjy.MySQL.BauweltMember;
import org.apache.commons.lang.Validate;
import org.bukkit.GameMode;
import org.bukkit.command.CommandSender;
import org.bukkit.command.defaults.BukkitCommand;
import org.bukkit.entity.Player;
import org.bukkit.util.StringUtil;

import java.util.ArrayList;
import java.util.List;

public class CommandGamemode extends BukkitCommand {
    private static final List<String> GAMEMODE_NAMES = ImmutableList.of("adventure", "creative", "survival",
	    "spectator");

    public CommandGamemode() {
		super("gamemode");
		List<String> aliases = new ArrayList<>();
		aliases.add("gm");
		this.setAliases(aliases);
		this.description = "Ändert den Spielmodus eines Spielers";
		this.usageMessage = "/gm [Spielmodus]";
    }

    public boolean execute(CommandSender sender, String currentAlias, String[] args) {
		if (!(sender instanceof Player)) {
			return false;
		}else if (args.length == 0) {
			sender.sendMessage(BauSystem.PREFIX + this.usageMessage);
			return false;
		}

		Player p = (Player) sender;

		if(!p.getUniqueId().equals(BauSystem.getOwner())){
			BauweltMember member = BauweltMember.getBauMember(BauSystem.getOwner(), p.getUniqueId());
			if(member == null || !member.isBuild()){
				p.sendMessage(BauSystem.PREFIX + "§cDu darfst hier deinen Spielmodus nicht ändern");
				return false;
			}
		}

		GameMode mode = createMode(args[0]);

		if(mode == null){
			p.sendMessage(BauSystem.PREFIX + "§cUnbekannter Spielmodus");
			return false;
		}

		p.setGameMode(mode);
		return true;
    }

    private GameMode createMode(String modeArg){
		try {
			return GameMode.getByValue(Integer.parseInt(modeArg));
		} catch (NumberFormatException ignored) {
			if ((modeArg.equalsIgnoreCase("creative")) || (modeArg.equalsIgnoreCase("c")))
				return GameMode.CREATIVE;
			else if ((modeArg.equalsIgnoreCase("adventure")) || (modeArg.equalsIgnoreCase("a")))
				return GameMode.ADVENTURE;
			else if ((modeArg.equalsIgnoreCase("spectator")) || (modeArg.equalsIgnoreCase("sp")))
				return GameMode.SPECTATOR;
		}
		return null;
	}

	@Override
    public List<String> tabComplete(CommandSender sender, String alias, String[] args) {
		Validate.notNull(sender, "Sender cannot be null");
		Validate.notNull(args, "Arguments cannot be null");
		Validate.notNull(alias, "Alias cannot be null");

		if (args.length == 1)
			return ((List) StringUtil.copyPartialMatches(args[0], GAMEMODE_NAMES,
				new ArrayList(GAMEMODE_NAMES.size())));
		if (args.length == 2) {
			return super.tabComplete(sender, alias, args);
		}
		return ImmutableList.of();
    }
}