From 65e8faf29a68d8cbde4bed08a377dd83171c9720 Mon Sep 17 00:00:00 2001
From: CraftBukkit/Spigot <noreply+git-craftbukkit@papermc.io>
Date: Thu, 2 Jul 2020 09:27:18 +1000
Subject: [PATCH] #682: Add hasDiscoveredRecipe() and getDiscoveredRecipes()

By: Parker Hawke <hawkeboyz2@hotmail.com>
---
 paper-server/nms-patches/RecipeBook.patch         | 11 +++++++++++
 .../craftbukkit/entity/CraftHumanEntity.java      | 11 +++++++++++
 .../bukkit/craftbukkit/entity/CraftPlayer.java    | 15 +++++++++++++++
 3 files changed, 37 insertions(+)
 create mode 100644 paper-server/nms-patches/RecipeBook.patch

diff --git a/paper-server/nms-patches/RecipeBook.patch b/paper-server/nms-patches/RecipeBook.patch
new file mode 100644
index 0000000000..2034712bcb
--- /dev/null
+++ b/paper-server/nms-patches/RecipeBook.patch
@@ -0,0 +1,11 @@
+--- a/net/minecraft/server/RecipeBook.java
++++ b/net/minecraft/server/RecipeBook.java
+@@ -6,7 +6,7 @@
+ 
+ public class RecipeBook {
+ 
+-    protected final Set<MinecraftKey> a = Sets.newHashSet();
++    public final Set<MinecraftKey> a = Sets.newHashSet(); // PAIL
+     protected final Set<MinecraftKey> b = Sets.newHashSet();
+     protected boolean c;
+     protected boolean d;
diff --git a/paper-server/src/main/java/org/bukkit/craftbukkit/entity/CraftHumanEntity.java b/paper-server/src/main/java/org/bukkit/craftbukkit/entity/CraftHumanEntity.java
index fdebdf85c4..60ef17fdb1 100644
--- a/paper-server/src/main/java/org/bukkit/craftbukkit/entity/CraftHumanEntity.java
+++ b/paper-server/src/main/java/org/bukkit/craftbukkit/entity/CraftHumanEntity.java
@@ -1,6 +1,7 @@
 package org.bukkit.craftbukkit.entity;
 
 import com.google.common.base.Preconditions;
+import com.google.common.collect.ImmutableSet;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Collection;
@@ -506,6 +507,16 @@ public class CraftHumanEntity extends CraftLivingEntity implements HumanEntity {
         return getHandle().undiscoverRecipes(bukkitKeysToMinecraftRecipes(recipes));
     }
 
+    @Override
+    public boolean hasDiscoveredRecipe(NamespacedKey recipe) {
+        return false;
+    }
+
+    @Override
+    public Set<NamespacedKey> getDiscoveredRecipes() {
+        return ImmutableSet.of();
+    }
+
     private Collection<IRecipe<?>> bukkitKeysToMinecraftRecipes(Collection<NamespacedKey> recipeKeys) {
         Collection<IRecipe<?>> recipes = new ArrayList<>();
         CraftingManager manager = getHandle().world.getMinecraftServer().getCraftingManager();
diff --git a/paper-server/src/main/java/org/bukkit/craftbukkit/entity/CraftPlayer.java b/paper-server/src/main/java/org/bukkit/craftbukkit/entity/CraftPlayer.java
index 35b25a02c0..9f027e1f1c 100644
--- a/paper-server/src/main/java/org/bukkit/craftbukkit/entity/CraftPlayer.java
+++ b/paper-server/src/main/java/org/bukkit/craftbukkit/entity/CraftPlayer.java
@@ -77,6 +77,7 @@ import org.bukkit.GameMode;
 import org.bukkit.Instrument;
 import org.bukkit.Location;
 import org.bukkit.Material;
+import org.bukkit.NamespacedKey;
 import org.bukkit.Note;
 import org.bukkit.OfflinePlayer;
 import org.bukkit.Particle;
@@ -106,6 +107,7 @@ import org.bukkit.craftbukkit.map.RenderData;
 import org.bukkit.craftbukkit.scoreboard.CraftScoreboard;
 import org.bukkit.craftbukkit.util.CraftChatMessage;
 import org.bukkit.craftbukkit.util.CraftMagicNumbers;
+import org.bukkit.craftbukkit.util.CraftNamespacedKey;
 import org.bukkit.entity.EntityType;
 import org.bukkit.entity.Player;
 import org.bukkit.event.player.PlayerRegisterChannelEvent;
@@ -757,6 +759,19 @@ public class CraftPlayer extends CraftHumanEntity implements Player {
         return new Location(getWorld(), bed.getX(), bed.getY(), bed.getZ());
     }
 
+    @Override
+    public boolean hasDiscoveredRecipe(NamespacedKey recipe) {
+        Preconditions.checkArgument(recipe != null, "recipe cannot be null");
+        return getHandle().B().b(CraftNamespacedKey.toMinecraft(recipe));
+    }
+
+    @Override
+    public Set<NamespacedKey> getDiscoveredRecipes() {
+        ImmutableSet.Builder<NamespacedKey> bukkitRecipeKeys = ImmutableSet.builder();
+        getHandle().B().a.forEach(key -> bukkitRecipeKeys.add(CraftNamespacedKey.fromMinecraft(key)));
+        return bukkitRecipeKeys.build();
+    }
+
     @Override
     public void incrementStatistic(Statistic statistic) {
         CraftStatistic.incrementStatistic(getHandle().getStatisticManager(), statistic);