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[1.11] Parsing a Command alias


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I am hoping someone can assist me and I apologize in advance if my questions seem trivial. I haven't worked with Minecraft Forge modding for long. That being said, I will dive right into my question.


My mod has command methods for setting a position in the world. The command works fine for setting the position to the sending entity's current position. (if I call /setpos1 my pos1 BlockPos variable is set to the entity's current X, Y, Z).


The commands I have working was done as follows:

1) Create the command class and have that command class implement ICommand:

public class SetPos1 implements ICommand ...


2) Register the new command during the FMLServerStartingEvent:

event.RegisterServerCommand(new SetPos1(dcs)); 

Where dcs is an abstract class that keeps track of global variables for the mod such as the newly set position.


3) What I want to extend the command to do:

I would like the player to be able to set positions other than their current position.

So, two things: I want the command /setpos x y z and /setpos  ~x ~y ~z.


Where /setpos x y z sets the pos to the user-specified x y z coords (/setpos 256 64 512 for example)

and where /setpos ~x ~y ~z sets the pos to the user-specified coords that are ~x ~y ~z units from their current position.

(/setpos ~-10 ~10 ~10 would set the pos to the coords that are 10 blocks in the negative X direction, 10 blocks in the positive Y direction, and 10 blocks in the positive Z direction. Such that if the player issued the command at 0,0,0 the pos would be set to -10X, 10Y, 10Z).


I am having trouble figuring out how to do this using the aliases. Can you help?

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Update: I read in a similar post by diesieben07 that I should be extending CommandBase in my command classes rather than implementing ICommand. (CommandBase already implements ICommand).


I see that CommandBase has a few parse functions. I will dabble in that and see what I can do.

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Ok so I have the command doing exactly what I wanted it to do:

1)store the players current position.

2)alternately allow the player to store a specific position either by directly entering an integer x|~x y|~y z|~z. where the ~ symbol determines that the coordinate is to be a an integer distance from the players current pos. Thus, ~x is x blocks in the positive or negative x direction from the player's current position.


Basically it works the same as /tp x y z or /tp ~x ~y ~z.


I still have a couple questions that I am hoping someone has addressed already but I can't seem to find what I need in my googling. First of all, the command code:

public class SetPos1 extends CommandBase {

  private final List aliases;
  private ControllerDroid controllerDroid;

  public SetPos1(ControllerDroid cDroid) {
    aliases = new ArrayList();
    aliases.add("someFantasticModName setpos1");
    this.controllerDroid = cDroid;

  public String getCommandName() {
    //The name of the command
    return "SetPositions";

  public String getCommandUsage(ICommandSender sender) {
    //Help file summary.
    return "setpos1 | setpos1 x y z | setpos1 ~x ~y ~z";

  public List<String> getCommandAliases() {
    //Return the List of aliases for this command
    return this.aliases;

  public void execute(MinecraftServer server, ICommandSender sender, String[] args) throws CommandException {
    //Code Execution when command is run
    World world = sender.getEntityWorld();
    int x = (int) sender.getCommandSenderEntity().posX;
    int y = (int) sender.getCommandSenderEntity().posY;
    int z = (int) sender.getCommandSenderEntity().posZ;

    if (world.isRemote) {
      //Code for client-side execution
    } else { //Code for server-side execution
      if (args.length == 3) {
        for (int i = 0; i < 3; i++) {
          if (i == 0) {
            if (args[i].startsWith("~")) {
              x = x + CommandBase.parseInt(args[i].substring(1));
            } else {
              x = CommandBase.parseInt(args[i]);
          if (i == 1) {
            if (args[i].startsWith("~")) {
              y = y + CommandBase.parseInt(args[i].substring(1));
            } else {
              y = CommandBase.parseInt(args[i]);
          if (i == 2) {
            if (args[i].startsWith("~")) {
              z = z + CommandBase.parseInt(args[i].substring(1));
            } else {
              z = CommandBase.parseInt(args[i]);
        controllerDroid.setPos1(x, y, z);

      if (args.length == 0) {

        controllerDroid.setPos1(x, y, z);


      sender.addChatMessage(new TextComponentString("Position 1 set to:  ["
              + controllerDroid.getPos1().getX()
              + "=X,  "
              + controllerDroid.getPos1().getY()
              + "=Y,  "
              + controllerDroid.getPos1().getZ()
              + "=Z]"));


  public boolean checkPermission(MinecraftServer server, ICommandSender sender) {
    //Does the sending entity have permission to use this command? Probably
    return true;

  public List<String> getTabCompletionOptions(MinecraftServer server, ICommandSender sender, String[] args, BlockPos pos) {
    return null;

  public int compareTo(ICommand o) {
    return 0;



So the code works as intended when I use /setpos1 and /setpos1 x y z and so on. However I kind of want the alias to be /SomeFantasticModName setpos1:

alias.add("someFantasticModName setpos1");


this doesn't seem to work though and it throws Unknown Command. So what I want is to have my mod name as a prefix to the actual commands. However the execute method isn't being called at all on an alias with multiple words in the string.


It seemed to me that I could just do


and could then handle whatever command args[0] happened to be. This seemed incorrect though since /somfantasticmodname would call all of my commands at once which seems like something I don't want to do.

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