From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: William Blake Galbreath <Blake.Galbreath@GMail.com>
Date: Sat, 3 Oct 2020 17:40:52 -0500
Subject: [PATCH] Add predicate to recipe's ExactChoice ingredient


diff --git a/src/main/java/net/minecraft/server/RecipeItemStack.java b/src/main/java/net/minecraft/server/RecipeItemStack.java
index 0f96abd0ca78e9c78306fed69684dee71be37703..f6d92949409b66d5d0c578e010aebd058903c6fa 100644
--- a/src/main/java/net/minecraft/server/RecipeItemStack.java
+++ b/src/main/java/net/minecraft/server/RecipeItemStack.java
@@ -26,6 +26,7 @@ public final class RecipeItemStack implements Predicate<ItemStack> {
     public ItemStack[] choices;
     private IntList d;
     public boolean exact; // CraftBukkit
+    public Predicate<org.bukkit.inventory.ItemStack> predicate; // Purpur
 
     public RecipeItemStack(Stream<? extends RecipeItemStack.Provider> stream) {
         this.b = (RecipeItemStack.Provider[]) stream.toArray((i) -> {
@@ -52,6 +53,12 @@ public final class RecipeItemStack implements Predicate<ItemStack> {
             if (this.choices.length == 0) {
                 return itemstack.isEmpty();
             } else {
+                // Purpur start
+                if (predicate != null) {
+                    return predicate.test(itemstack.asBukkitCopy());
+                }
+                // Purpur end
+
                 ItemStack[] aitemstack = this.choices;
                 int i = aitemstack.length;
 
diff --git a/src/main/java/org/bukkit/craftbukkit/inventory/CraftRecipe.java b/src/main/java/org/bukkit/craftbukkit/inventory/CraftRecipe.java
index ef29599a89bc630899c65df9a7004f836787d95e..18413e6327458c6d60d2a0ca8167fc5d75389934 100644
--- a/src/main/java/org/bukkit/craftbukkit/inventory/CraftRecipe.java
+++ b/src/main/java/org/bukkit/craftbukkit/inventory/CraftRecipe.java
@@ -22,6 +22,7 @@ public interface CraftRecipe extends Recipe {
         } else if (bukkit instanceof RecipeChoice.ExactChoice) {
             stack = new RecipeItemStack(((RecipeChoice.ExactChoice) bukkit).getChoices().stream().map((mat) -> new net.minecraft.server.RecipeItemStack.StackProvider(CraftItemStack.asNMSCopy(mat))));
             stack.exact = true;
+            stack.predicate = ((RecipeChoice.ExactChoice) bukkit).getPredicate(); // Purpur
         } else {
             throw new IllegalArgumentException("Unknown recipe stack instance " + bukkit);
         }