PaperMC/Spigot-Server-Patches/0522-Add-PrepareResultEvent.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: William Blake Galbreath <Blake.Galbreath@GMail.com>
Date: Fri, 3 Jul 2020 11:58:56 -0500
Subject: [PATCH] Add PrepareResultEvent

Adds a new event for all crafting stations that generate a result slot item

Anvil, Grindstone and Smithing now extend this event

diff --git a/src/main/java/net/minecraft/world/inventory/Container.java b/src/main/java/net/minecraft/world/inventory/Container.java
index e9733fd9dac89d31dbad391cb22a8c84216045db..e7c29d194d5c3e3b1b79228758f7a3d8aa060fbd 100644
--- a/src/main/java/net/minecraft/world/inventory/Container.java
+++ b/src/main/java/net/minecraft/world/inventory/Container.java
@@ -142,6 +142,7 @@ public abstract class Container {
         return nonnulllist;
     }
 
+    public final void notifyListeners() { this.c(); } // Paper - OBFHELPER
     public void c() {
         int i;
 
diff --git a/src/main/java/net/minecraft/world/inventory/ContainerAnvil.java b/src/main/java/net/minecraft/world/inventory/ContainerAnvil.java
index ff618bbb3fc4acfce51f5e5e6a504a63e9ad77cd..ae5674ae9c539720a657838a640050cd3b4dc5b5 100644
--- a/src/main/java/net/minecraft/world/inventory/ContainerAnvil.java
+++ b/src/main/java/net/minecraft/world/inventory/ContainerAnvil.java
@@ -307,6 +307,7 @@ public class ContainerAnvil extends ContainerAnvilAbstract {
         }
 
         this.e();
+        org.bukkit.craftbukkit.event.CraftEventFactory.callPrepareResultEvent(this, 2); // Paper
     }
 
     // CraftBukkit start
diff --git a/src/main/java/net/minecraft/world/inventory/ContainerAnvilAbstract.java b/src/main/java/net/minecraft/world/inventory/ContainerAnvilAbstract.java
index 949042d4e4a1a63c0477704265fe32c371543e8c..9d47f2253a8adbcecbbe3d8a0a42e62f1dac1408 100644
--- a/src/main/java/net/minecraft/world/inventory/ContainerAnvilAbstract.java
+++ b/src/main/java/net/minecraft/world/inventory/ContainerAnvilAbstract.java
@@ -71,6 +71,7 @@ public abstract class ContainerAnvilAbstract extends Container {
         super.a(iinventory);
         if (iinventory == this.repairInventory) {
             this.e();
+            org.bukkit.craftbukkit.event.CraftEventFactory.callPrepareResultEvent(this, 2); // Paper
         }
 
     }
diff --git a/src/main/java/net/minecraft/world/inventory/ContainerCartography.java b/src/main/java/net/minecraft/world/inventory/ContainerCartography.java
index ce3c22d6f05703874eedf634331ea92ef4c039bf..031e75dc1f3dd6fc1cee684e8e7a105b3e402127 100644
--- a/src/main/java/net/minecraft/world/inventory/ContainerCartography.java
+++ b/src/main/java/net/minecraft/world/inventory/ContainerCartography.java
@@ -148,6 +148,7 @@ public class ContainerCartography extends Container {
             this.a(itemstack, itemstack1, itemstack2);
         }
 
+        org.bukkit.craftbukkit.event.CraftEventFactory.callPrepareResultEvent(this, 2); // Paper
     }
 
     private void a(ItemStack itemstack, ItemStack itemstack1, ItemStack itemstack2) {
diff --git a/src/main/java/net/minecraft/world/inventory/ContainerGrindstone.java b/src/main/java/net/minecraft/world/inventory/ContainerGrindstone.java
index fad7355a549aef811bca43be198af3d1c0a53980..1d5dcbbd3870eb8e1013a97f6ce882bfc096bf95 100644
--- a/src/main/java/net/minecraft/world/inventory/ContainerGrindstone.java
+++ b/src/main/java/net/minecraft/world/inventory/ContainerGrindstone.java
@@ -157,6 +157,7 @@ public class ContainerGrindstone extends Container {
         super.a(iinventory);
         if (iinventory == this.craftInventory) {
             this.e();
+            org.bukkit.craftbukkit.event.CraftEventFactory.callPrepareResultEvent(this, 2); // Paper
         }
 
     }
diff --git a/src/main/java/net/minecraft/world/inventory/ContainerLoom.java b/src/main/java/net/minecraft/world/inventory/ContainerLoom.java
index 350a9b6525a95a00e72e836f1cc9e1a6b99fdd7a..7980930cc712e37a788f894bf2d2ee2b1cfc1196 100644
--- a/src/main/java/net/minecraft/world/inventory/ContainerLoom.java
+++ b/src/main/java/net/minecraft/world/inventory/ContainerLoom.java
@@ -190,7 +190,8 @@ public class ContainerLoom extends Container {
         }
 
         this.j();
-        this.c();
+        //this.c(); // Paper - done below
+        org.bukkit.craftbukkit.event.CraftEventFactory.callPrepareResultEvent(this, 3); // Paper
     }
 
     @Override
diff --git a/src/main/java/net/minecraft/world/inventory/ContainerSmithing.java b/src/main/java/net/minecraft/world/inventory/ContainerSmithing.java
index 1cc0ba5b8f182ac5105d2dc493463055e32a52e5..594cbd23c5d8ee2aa88106a1f0a79db0c8ba83a3 100644
--- a/src/main/java/net/minecraft/world/inventory/ContainerSmithing.java
+++ b/src/main/java/net/minecraft/world/inventory/ContainerSmithing.java
@@ -79,6 +79,7 @@ public class ContainerSmithing extends ContainerAnvilAbstract {
             // CraftBukkit end
         }
 
+        org.bukkit.craftbukkit.event.CraftEventFactory.callPrepareResultEvent(this, 2); // Paper
     }
 
     @Override
diff --git a/src/main/java/net/minecraft/world/inventory/ContainerStonecutter.java b/src/main/java/net/minecraft/world/inventory/ContainerStonecutter.java
index cfcb2469569edd51bbb74ca8d7a35a1ec0ecb434..1589d9ca201d386d11d9fd57fa8ba6848bae215c 100644
--- a/src/main/java/net/minecraft/world/inventory/ContainerStonecutter.java
+++ b/src/main/java/net/minecraft/world/inventory/ContainerStonecutter.java
@@ -156,6 +156,7 @@ public class ContainerStonecutter extends Container {
             this.a(iinventory, itemstack);
         }
 
+        org.bukkit.craftbukkit.event.CraftEventFactory.callPrepareResultEvent(this, 1); // Paper
     }
 
     private void a(IInventory iinventory, ItemStack itemstack) {
diff --git a/src/main/java/org/bukkit/craftbukkit/event/CraftEventFactory.java b/src/main/java/org/bukkit/craftbukkit/event/CraftEventFactory.java
index d620d3e7c023786d1b7411399a05a75028a404cc..55619fbc3fdb9393d7c47a23dc337b06ce4495d6 100644
--- a/src/main/java/org/bukkit/craftbukkit/event/CraftEventFactory.java
+++ b/src/main/java/org/bukkit/craftbukkit/event/CraftEventFactory.java
@@ -1534,19 +1534,44 @@ public class CraftEventFactory {
         return event;
     }
 
-    public static PrepareAnvilEvent callPrepareAnvilEvent(InventoryView view, ItemStack item) {
-        PrepareAnvilEvent event = new PrepareAnvilEvent(view, CraftItemStack.asCraftMirror(item).clone());
-        event.getView().getPlayer().getServer().getPluginManager().callEvent(event);
+    // Paper start - disable this method, handled below
+    public static void callPrepareAnvilEvent(InventoryView view, ItemStack item) { // Paper - verify nothing uses return - handled below in PrepareResult
+        PrepareAnvilEvent event = new PrepareAnvilEvent(view, CraftItemStack.asCraftMirror(item)); // Paper - remove clone
+        //event.getView().getPlayer().getServer().getPluginManager().callEvent(event); // disable event
         event.getInventory().setItem(2, event.getResult());
-        return event;
+        //return event; // Paper
     }
+    // Paper end
 
-    public static PrepareSmithingEvent callPrepareSmithingEvent(InventoryView view, ItemStack item) {
-        PrepareSmithingEvent event = new PrepareSmithingEvent(view, CraftItemStack.asCraftMirror(item).clone());
-        event.getView().getPlayer().getServer().getPluginManager().callEvent(event);
+    // Paper start - disable this method, handled in callPrepareResultEvent
+    public static void callPrepareSmithingEvent(InventoryView view, ItemStack item) { // Paper - verify nothing uses return - handled below in PrepareResult
+        PrepareSmithingEvent event = new PrepareSmithingEvent(view, CraftItemStack.asCraftMirror(item)); // Paper - remove clone
+        //event.getView().getPlayer().getServer().getPluginManager().callEvent(event); // Paper - disable event
         event.getInventory().setItem(2, event.getResult());
-        return event;
+        //return event; // Paper
     }
+    // Paper end
+
+    // Paper start - support specific overrides for prepare result
+    public static void callPrepareResultEvent(Container container, int resultSlot) {
+        com.destroystokyo.paper.event.inventory.PrepareResultEvent event;
+        InventoryView view = container.getBukkitView();
+        org.bukkit.inventory.ItemStack origItem = view.getTopInventory().getItem(resultSlot);
+        CraftItemStack result = origItem != null ? CraftItemStack.asCraftCopy(origItem) : null;
+        if (view.getTopInventory() instanceof org.bukkit.inventory.AnvilInventory) {
+            event = new PrepareAnvilEvent(view, result);
+        } else if (view.getTopInventory() instanceof org.bukkit.inventory.GrindstoneInventory) {
+            event = new com.destroystokyo.paper.event.inventory.PrepareGrindstoneEvent(view, result);
+        } else if (view.getTopInventory() instanceof org.bukkit.inventory.SmithingInventory) {
+            event = new PrepareSmithingEvent(view, result);
+        } else {
+            event = new com.destroystokyo.paper.event.inventory.PrepareResultEvent(view, result);
+        }
+        event.callEvent();
+        event.getInventory().setItem(resultSlot, event.getResult());
+        container.notifyListeners();
+    }
+    // Paper end
 
     /**
      * Mob spawner event.