From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Matthew Miller <mnmiller1@me.com>
Date: Sun, 17 Jan 2021 13:16:09 +1000
Subject: [PATCH] Implement BlockPreDispenseEvent


diff --git a/src/main/java/net/minecraft/server/BlockDispenser.java b/src/main/java/net/minecraft/server/BlockDispenser.java
index 063453552b7b6c2395c8f9be27cdb71a15a56ca4..89325af931b5ca43729758e94e971b612f65eea2 100644
--- a/src/main/java/net/minecraft/server/BlockDispenser.java
+++ b/src/main/java/net/minecraft/server/BlockDispenser.java
@@ -55,6 +55,7 @@ public class BlockDispenser extends BlockTileEntity {
             IDispenseBehavior idispensebehavior = this.a(itemstack);
 
             if (idispensebehavior != IDispenseBehavior.NONE) {
+                if (!org.bukkit.craftbukkit.event.CraftEventFactory.handleBlockPreDispenseEvent(worldserver, blockposition, itemstack, i)) return; // Paper - BlockPreDispenseEvent is called here
                 eventFired = false; // CraftBukkit - reset event status
                 tileentitydispenser.setItem(i, idispensebehavior.dispense(sourceblock, itemstack));
             }
diff --git a/src/main/java/org/bukkit/craftbukkit/event/CraftEventFactory.java b/src/main/java/org/bukkit/craftbukkit/event/CraftEventFactory.java
index c225822da37b04814fe990d0f7044f74f2987d13..02a588d83e1ee5091d93fdc3cdec04bdf92d2d05 100644
--- a/src/main/java/org/bukkit/craftbukkit/event/CraftEventFactory.java
+++ b/src/main/java/org/bukkit/craftbukkit/event/CraftEventFactory.java
@@ -13,6 +13,7 @@ import java.util.List;
 import java.util.Map;
 import java.util.stream.Collectors;
 import javax.annotation.Nullable;
+import io.papermc.paper.event.block.BlockPreDispenseEvent;
 import net.minecraft.server.BlockPosition;
 import net.minecraft.server.BlockPropertyInstrument;
 import net.minecraft.server.Container;
@@ -1770,5 +1771,11 @@ public class CraftEventFactory {
         BlockFailedDispenseEvent event = new BlockFailedDispenseEvent(block);
         return event.callEvent();
     }
+
+    public static boolean handleBlockPreDispenseEvent(WorldServer worldserver, BlockPosition blockposition, ItemStack itemStack, int slot) {
+        org.bukkit.block.Block block = worldserver.getWorld().getBlockAt(blockposition.getX(), blockposition.getY(), blockposition.getZ());
+        BlockPreDispenseEvent event = new BlockPreDispenseEvent(block, org.bukkit.craftbukkit.inventory.CraftItemStack.asCraftMirror(itemStack), slot);
+        return event.callEvent();
+    }
     // Paper end
 }