From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Andrew Steinborn <git@steinborn.me>
Date: Tue, 2 Feb 2021 20:59:35 -0500
Subject: [PATCH] Port LazyDFU


diff --git a/src/main/java/me/steinborn/lazydfu/mod/LazyDataFixerBuilder.java b/src/main/java/me/steinborn/lazydfu/mod/LazyDataFixerBuilder.java
new file mode 100644
index 0000000000000000000000000000000000000000..081aa46531a9df1dc732669a2c1e3180790468c4
--- /dev/null
+++ b/src/main/java/me/steinborn/lazydfu/mod/LazyDataFixerBuilder.java
@@ -0,0 +1,23 @@
+package me.steinborn.lazydfu.mod;
+
+import com.mojang.datafixers.DataFixerBuilder;
+import com.mojang.datafixers.DataFixer;
+
+import java.util.concurrent.Executor;
+
+/**
+ * This version of {@code DataFixerBuilder} does not immediately initialize rules.
+ */
+public class LazyDataFixerBuilder extends DataFixerBuilder {
+
+    private static final Executor NO_OP_EXECUTOR = command -> {};
+
+    public LazyDataFixerBuilder(int dataVersion) {
+        super(dataVersion);
+    }
+
+    @Override
+    public DataFixer build(Executor executor) {
+        return super.build(NO_OP_EXECUTOR);
+    }
+}
\ No newline at end of file
diff --git a/src/main/java/net/minecraft/server/DataConverterRegistry.java b/src/main/java/net/minecraft/server/DataConverterRegistry.java
index b149e32aac86ce2f7521958fa7394e4f5b852174..b077104a751dc921b37dacd092924d6f08850ac3 100644
--- a/src/main/java/net/minecraft/server/DataConverterRegistry.java
+++ b/src/main/java/net/minecraft/server/DataConverterRegistry.java
@@ -18,7 +18,7 @@ public class DataConverterRegistry {
     // Yatopia start
     private static final DataFixer c;
     static {
-        DataFixerBuilder datafixerbuilder = new DataFixerBuilder(SharedConstants.getGameVersion().getWorldVersion());
+        DataFixerBuilder datafixerbuilder = new me.steinborn.lazydfu.mod.LazyDataFixerBuilder(SharedConstants.getGameVersion().getWorldVersion()); // Yatopia - Port LazyDFU
 
         a(datafixerbuilder);
         c = datafixerbuilder.build(SystemUtils.d);