From fbf903a1bcbb180194338da188077dba0ab93199 Mon Sep 17 00:00:00 2001
From: md_5 <git@md-5.net>
Date: Tue, 24 Jul 2018 10:08:34 +1000
Subject: SPIGOT-4120: Store BlockData enum mappings per class

---
 .../craftbukkit/block/data/CraftBlockData.java     | 36 +++++++++++++++++-----
 1 file changed, 29 insertions(+), 7 deletions(-)

diff --git a/src/main/java/org/bukkit/craftbukkit/block/data/CraftBlockData.java b/src/main/java/org/bukkit/craftbukkit/block/data/CraftBlockData.java
index 94549cee..d68fe947 100644
--- a/src/main/java/org/bukkit/craftbukkit/block/data/CraftBlockData.java
+++ b/src/main/java/org/bukkit/craftbukkit/block/data/CraftBlockData.java
@@ -89,7 +89,7 @@ public class CraftBlockData implements BlockData {
         this.state = this.state.set(nms, toNMS(bukkit, nms.b()));
     }
 
-    private static final BiMap<Enum<?>, Enum<?>> nmsToBukkit = HashBiMap.create();
+    private static final Map<Class, BiMap<Enum<?>, Enum<?>>> classMappings = new HashMap<>();
 
     /**
      * Convert an NMS Enum (usually a BlockStateEnum) to its appropriate Bukkit
@@ -99,9 +99,14 @@ public class CraftBlockData implements BlockData {
      */
     @SuppressWarnings("unchecked")
     private static <B extends Enum<B>> B toBukkit(Enum<?> nms, Class<B> bukkit) {
-        Enum<?> converted = nmsToBukkit.get(nms);
-        if (converted != null) {
-            return (B) converted;
+        Enum<?> converted;
+        BiMap<Enum<?>, Enum<?>> nmsToBukkit = classMappings.get(nms.getClass());
+
+        if (nmsToBukkit != null) {
+            converted = nmsToBukkit.get(nms);
+            if (converted != null) {
+                return (B) converted;
+            }
         }
 
         if (nms instanceof EnumDirection) {
@@ -111,6 +116,12 @@ public class CraftBlockData implements BlockData {
         }
 
         Preconditions.checkState(converted != null, "Could not convert enum %s->%s", nms, bukkit);
+
+        if (nmsToBukkit == null) {
+            nmsToBukkit = HashBiMap.create();
+            classMappings.put(nms.getClass(), nmsToBukkit);
+        }
+
         nmsToBukkit.put(nms, converted);
 
         return (B) converted;
@@ -126,9 +137,14 @@ public class CraftBlockData implements BlockData {
      */
     @SuppressWarnings("unchecked")
     private static <N extends Enum<N> & INamable> N toNMS(Enum<?> bukkit, Class<N> nms) {
-        Enum<?> converted = nmsToBukkit.inverse().get(bukkit);
-        if (converted != null) {
-            return (N) converted;
+        Enum<?> converted;
+        BiMap<Enum<?>, Enum<?>> nmsToBukkit = classMappings.get(nms.getClass());
+
+        if (nmsToBukkit != null) {
+            converted = nmsToBukkit.inverse().get(bukkit);
+            if (converted != null) {
+                return (N) converted;
+            }
         }
 
         if (bukkit instanceof BlockFace) {
@@ -138,6 +154,12 @@ public class CraftBlockData implements BlockData {
         }
 
         Preconditions.checkState(converted != null, "Could not convert enum %s->%s", nms, bukkit);
+
+        if (nmsToBukkit == null) {
+            nmsToBukkit = HashBiMap.create();
+            classMappings.put(nms.getClass(), nmsToBukkit);
+        }
+
         nmsToBukkit.put(converted, bukkit);
 
         return (N) converted;
-- 
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