From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Aikar <aikar@aikar.co>
Date: Sat, 6 Apr 2019 10:16:48 -0400
Subject: [PATCH] Optimize Captured BlockEntity Lookup

upstream was doing a containsKey/get pattern, and always doing it at that.
that scenario is only even valid if were in the middle of a block place.

Optimize to check if the captured list even has values in it, and also to
just do a get call since the value can never be null.

diff --git a/src/main/java/net/minecraft/world/level/Level.java b/src/main/java/net/minecraft/world/level/Level.java
index a5bdbf62bdeb9fd505699a92701f9ed4724b6c85..e51f4df5b6fcd28e681a77a1aa3a9eeb0c463e1a 100644
--- a/src/main/java/net/minecraft/world/level/Level.java
+++ b/src/main/java/net/minecraft/world/level/Level.java
@@ -913,9 +913,12 @@ public abstract class Level implements LevelAccessor, AutoCloseable {
 
     @Nullable
     public BlockEntity getBlockEntity(BlockPos blockposition, boolean validate) {
-        if (this.capturedTileEntities.containsKey(blockposition)) {
-            return this.capturedTileEntities.get(blockposition);
+        // Paper start - Perf: Optimize capturedTileEntities lookup
+        net.minecraft.world.level.block.entity.BlockEntity blockEntity;
+        if (!this.capturedTileEntities.isEmpty() && (blockEntity = this.capturedTileEntities.get(blockposition)) != null) {
+            return blockEntity;
         }
+        // Paper end - Perf: Optimize capturedTileEntities lookup
         // CraftBukkit end
         return this.isOutsideBuildHeight(blockposition) ? null : (!this.isClientSide && !io.papermc.paper.util.TickThread.isTickThread() ? null : this.getChunkAt(blockposition).getBlockEntity(blockposition, LevelChunk.EntityCreationType.IMMEDIATE)); // Paper - rewrite chunk system
     }