Use the World registry instead of dimension IDs

In 1.16, they got rid of dimension IDs and started using a registry. I
personally love this decision, but I need to update the mod for it.

src/main/java/party/_2a03/mc/command/HomeCommand.java

@@ -7,7 +7,7 @@ import net.minecraft.server.command.CommandManager;
 import net.minecraft.server.command.ServerCommandSource;
 import net.minecraft.server.network.ServerPlayerEntity;
 import net.minecraft.text.LiteralText;
-import net.minecraft.world.dimension.DimensionType;
+import net.minecraft.util.registry.RegistryKey;
 import party._2a03.mc.server.Config;
 import party._2a03.mc.server.PlayerData;
 import party._2a03.mc.server.PlayerPosition;
@@ -18,11 +18,11 @@ public class HomeCommand {
 			ServerCommandSource source = ctx.getSource();
 			ServerPlayerEntity sender = source.getPlayer();
 			PlayerPosition position = Config.getPlayer(sender.getUuid().toString()).getHome();
-			if (position.dimensiontype == null) {
+			if (position.registrykey == null) {
 				source.sendFeedback(new LiteralText("Home not found, do /home set"), false);
 				return -1;
 			}
-			sender.teleport(sender.getServer().getWorld(position.dimensiontype), position.x, position.y, position.z, position.yaw, position.pitch);
+			sender.teleport(sender.getServer().getWorld(position.registrykey), position.x, position.y, position.z, position.yaw, position.pitch);
 			source.sendFeedback(new LiteralText("Teleported to home"), true);
 			return 1;
 		});
@@ -36,8 +36,8 @@ public class HomeCommand {
 			double z = sender.getZ();
 			float yaw = sender.yaw;
 			float pitch = sender.pitch;
-			DimensionType dimensiontype = sender.getServerWorld().getDimension().getType();
+			RegistryKey registrykey = sender.getServerWorld().getRegistryKey();
-			PlayerPosition location = new PlayerPosition(x, y, z, yaw, pitch, dimensiontype);
+			PlayerPosition location = new PlayerPosition(x, y, z, yaw, pitch, registrykey);
 			playerdata.setHome(location);
 			Config.setPlayer(playerdata);
 			source.sendFeedback(new LiteralText("Your home has been updated"), true);
@@ -55,8 +55,8 @@ public class HomeCommand {
 			double z = sender.getZ();
 			float yaw = sender.yaw;
 			float pitch = sender.pitch;
-			DimensionType dimensiontype = sender.getServerWorld().getDimension().getType();
+			RegistryKey registrykey = sender.getServerWorld().getRegistryKey();
-			PlayerPosition location = new PlayerPosition(x, y, z, yaw, pitch, dimensiontype);
+			PlayerPosition location = new PlayerPosition(x, y, z, yaw, pitch, registrykey);
 			playerdata.setHome(location);
 			Config.setPlayer(playerdata);
 			source.sendFeedback(new LiteralText("User's home has been updated (" + StringArgumentType.getString(ctx, "UUID") + ")"), true);

src/main/java/party/_2a03/mc/command/SpawnCommand.java

@@ -6,7 +6,7 @@ import net.minecraft.server.command.CommandManager;
 import net.minecraft.server.command.ServerCommandSource;
 import net.minecraft.server.network.ServerPlayerEntity;
 import net.minecraft.text.LiteralText;
-import net.minecraft.world.dimension.DimensionType;
+import net.minecraft.util.registry.RegistryKey;
 import party._2a03.mc.server.Config;
 import party._2a03.mc.server.PlayerPosition;
 
@@ -16,7 +16,7 @@ public class SpawnCommand {
 			ServerCommandSource source = ctx.getSource();
 			ServerPlayerEntity sender = source.getPlayer();
 			PlayerPosition position = new PlayerPosition(Config.getData("spawn"));
-			if (position.dimensiontype == null) {
+			if (position.registrykey == null) {
 				if (source.hasPermissionLevel(2)) {
 					source.sendFeedback(new LiteralText("Spawn not found, do /spawn set"), false);
 				} else {
@@ -24,7 +24,7 @@ public class SpawnCommand {
 				}
 				return -1;
 			}
-			sender.teleport(sender.getServer().getWorld(position.dimensiontype), position.x, position.y, position.z, position.yaw, position.pitch);
+			sender.teleport(sender.getServer().getWorld(position.registrykey), position.x, position.y, position.z, position.yaw, position.pitch);
 			source.sendFeedback(new LiteralText("Teleported to the spawn point"), true);
 			return 1;
 		});
@@ -39,8 +39,8 @@ public class SpawnCommand {
 			double z = sender.getZ();
 			float yaw = sender.yaw;
 			float pitch = sender.pitch;
-			DimensionType dimensiontype = sender.getServerWorld().getDimension().getType();
+			RegistryKey registrykey = sender.getServerWorld().getRegistryKey();
-			PlayerPosition location = new PlayerPosition(x, y, z, yaw, pitch, dimensiontype);
+			PlayerPosition location = new PlayerPosition(x, y, z, yaw, pitch, registrykey);
 			Config.setData("spawn", location.getJSON());
 			source.sendFeedback(new LiteralText("Spawn has been set"), true);
 			return 1;

src/main/java/party/_2a03/mc/mixin/MixinPlayerEntity.java

@@ -1,25 +0,0 @@
-package party._2a03.mc.mixin;
-
-import net.minecraft.entity.LivingEntity;
-import net.minecraft.entity.player.PlayerEntity;
-import org.spongepowered.asm.mixin.injection.At;
-import org.spongepowered.asm.mixin.injection.Inject;
-import org.spongepowered.asm.mixin.injection.callback.CallbackInfo;
-import org.spongepowered.asm.mixin.injection.callback.CallbackInfoReturnable;
-import org.spongepowered.asm.mixin.Mixin;
-import party._2a03.mc.server.Config;
-import party._2a03.mc.server.PlayerPosition;
-
-@Mixin(PlayerEntity.class)
-public abstract class MixinPlayerEntity extends LivingEntity {	
-	public MixinPlayerEntity() {
-		super(null, null);
-	}
-
-	@Inject(method = "getSpawnPosition", at = @At("RETURN"), cancellable = true)
-	public void OnGetSpawnPosition(CallbackInfoReturnable cir) {
-		PlayerPosition position = new PlayerPosition(Config.getData("spawn"));
-		if (position.dimensiontype == this.dimension)
-			cir.setReturnValue(null); // Don't override the world spawn.
-	}
-}

src/main/java/party/_2a03/mc/mixin/MixinServerPlayerEntity.java

@@ -2,23 +2,29 @@ package party._2a03.mc.mixin;
 
 import net.minecraft.entity.player.PlayerEntity;
 import net.minecraft.server.network.ServerPlayerEntity;
+import net.minecraft.util.registry.RegistryKey;
+import net.minecraft.world.World;
 import org.spongepowered.asm.mixin.injection.At;
 import org.spongepowered.asm.mixin.injection.Inject;
 import org.spongepowered.asm.mixin.injection.callback.CallbackInfo;
 import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.Shadow;
 import party._2a03.mc.server.Config;
 import party._2a03.mc.server.PlayerPosition;
 
 @Mixin(ServerPlayerEntity.class)
 public abstract class MixinServerPlayerEntity extends PlayerEntity {
+	@Shadow
+	private RegistryKey<World> spawnPointDimension;
+	
 	public MixinServerPlayerEntity() {
-		super(null, null);
+		super(null, null, null);
 	}
 
 	@Inject(method = "moveToSpawn", at = @At("HEAD"), cancellable = true)
 	private void OnServerPlayerSpawn(CallbackInfo ci) {
 		PlayerPosition position = new PlayerPosition(Config.getData("spawn"));
-		if (position.dimensiontype == this.dimension) {
+		if (position.registrykey == this.spawnPointDimension) {
 			this.updatePositionAndAngles(position.x, position.y, position.z, position.yaw, position.pitch);
 			ci.cancel();
 		}

src/main/java/party/_2a03/mc/server/Config.java

@@ -33,7 +33,7 @@ public class Config {
 			json = new JSONObject(jsonRaw);
 		} else {
 			LOGGER.info("Config not found, creating one");
-			json = new JSONObject("{\"disableTntExplosions\":false,\"spawn\":[0,0,0,0,0,-2],\"members\":[]}");
+			json = new JSONObject("{\"disableTntExplosions\":false,\"spawn\":[0,0,0,0,0,\"\"],\"members\":[]}");
 			saveConfig();
 		}
 		LOGGER.info("Configuration loaded");
@@ -93,4 +93,4 @@ public class Config {
 			LOGGER.error("Failed to save config file");
 		}
 	}
-}
+}

src/main/java/party/_2a03/mc/server/PlayerPosition.java

@@ -1,7 +1,9 @@
 package party._2a03.mc.server;
 
 import org.json.JSONArray;
-import net.minecraft.world.dimension.DimensionType;
+import net.minecraft.util.Identifier;
+import net.minecraft.util.registry.Registry;
+import net.minecraft.util.registry.RegistryKey;
 import party._2a03.mc.server.Config;
 
 public class PlayerPosition {
@@ -10,49 +12,49 @@ public class PlayerPosition {
 	public double z;
 	public float yaw;
 	public float pitch;
-	public DimensionType dimensiontype;
+	public RegistryKey registrykey;
 
 	public PlayerPosition() {
 	}
 
 	public PlayerPosition(JSONArray data) {
-		int dimension_id = data.getInt(5);
+		String registry_string = data.getString(5);
-		if (dimension_id != -2) {
+		if (!registry_string.isEmpty()) {
 			this.x = data.getDouble(0);
 			this.y = data.getDouble(1);
 			this.z = data.getDouble(2);
 			this.yaw = data.getNumber(3).floatValue();
 			this.pitch = data.getNumber(4).floatValue();
-			this.dimensiontype = DimensionType.byRawId(dimension_id);
+			this.registrykey = RegistryKey.of(Registry.DIMENSION, new Identifier(registry_string));
 		}
 	}
 
-	public PlayerPosition(double p_x, double p_y, double p_z, float p_yaw, float p_pitch, DimensionType p_dimensiontype) {
+	public PlayerPosition(double p_x, double p_y, double p_z, float p_yaw, float p_pitch, RegistryKey p_registrykey) {
 		this.x = p_x;
 		this.y = p_y;
 		this.z = p_z;
 		this.yaw = p_yaw;
 		this.pitch = p_pitch;
-		this.dimensiontype = p_dimensiontype;
+		this.registrykey = p_registrykey;
 	}
 
 	public JSONArray getJSON() {
 		JSONArray json = new JSONArray();
-		if (this.dimensiontype != null) {
+		if (this.registrykey != null) {
 			json.put(this.x);
 			json.put(this.y);
 			json.put(this.z);
 			json.put(this.yaw);
 			json.put(this.pitch);
-			json.put(this.dimensiontype.getRawId());
+			json.put(this.registrykey.getValue().toString());
 		} else {
 			json.put(0);
 			json.put(0);
 			json.put(0);
 			json.put(0);
 			json.put(0);
-			json.put(-2);
+			json.put("");
 		}
 		return json;
 	}
-}
+}

src/main/resources/minecraft-tweaks-2a03.mixins.json

@@ -4,7 +4,6 @@
 	"compatibilityLevel": "JAVA_8",
 	"server": [
 		"MixinGameModeCommand",
-		"MixinPlayerEntity",
 		"MixinServerPlayerEntity",
 		"MixinTntBlock",
 		"MixinTntEntity"