craftbukkit/nms-patches/net/minecraft/world/item/crafting/CraftingManager.patch

--- a/net/minecraft/world/item/crafting/CraftingManager.java
+++ b/net/minecraft/world/item/crafting/CraftingManager.java
@@ -33,11 +33,13 @@
 import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
 
+import it.unimi.dsi.fastutil.objects.Object2ObjectLinkedOpenHashMap; // CraftBukkit
+
 public class CraftingManager extends ResourceDataJson {
 
     private static final Gson GSON = (new GsonBuilder()).setPrettyPrinting().disableHtmlEscaping().create();
     private static final Logger LOGGER = LogManager.getLogger();
-    public Map<Recipes<?>, Map<MinecraftKey, IRecipe<?>>> recipes = ImmutableMap.of();
+    public Map<Recipes<?>, Object2ObjectLinkedOpenHashMap<MinecraftKey, IRecipe<?>>> recipes = ImmutableMap.of(); // CraftBukkit
     private Map<MinecraftKey, IRecipe<?>> byName = ImmutableMap.of();
     private boolean hasErrors;
 
@@ -47,7 +49,12 @@
 
     protected void apply(Map<MinecraftKey, JsonElement> map, IResourceManager iresourcemanager, GameProfilerFiller gameprofilerfiller) {
         this.hasErrors = false;
-        Map<Recipes<?>, Builder<MinecraftKey, IRecipe<?>>> map1 = Maps.newHashMap();
+        // CraftBukkit start - SPIGOT-5667 make sure all types are populated and mutable
+        Map<Recipes<?>, Object2ObjectLinkedOpenHashMap<MinecraftKey, IRecipe<?>>> map1 = Maps.newHashMap();
+        for (Recipes<?> recipeType : IRegistry.RECIPE_TYPE) {
+            map1.put(recipeType, new Object2ObjectLinkedOpenHashMap<>());
+        }
+        // CraftBukkit end
         Builder<MinecraftKey, IRecipe<?>> builder = ImmutableMap.builder();
         Iterator iterator = map.entrySet().iterator();
 
@@ -58,8 +65,10 @@
             try {
                 IRecipe<?> irecipe = fromJson(minecraftkey, ChatDeserializer.convertToJsonObject((JsonElement) entry.getValue(), "top element"));
 
-                ((Builder) map1.computeIfAbsent(irecipe.getType(), (recipes) -> {
-                    return ImmutableMap.builder();
+                // CraftBukkit start
+                (map1.computeIfAbsent(irecipe.getType(), (recipes) -> {
+                    return new Object2ObjectLinkedOpenHashMap<>();
+                    // CraftBukkit end
                 })).put(minecraftkey, irecipe);
                 builder.put(minecraftkey, irecipe);
             } catch (IllegalArgumentException | JsonParseException jsonparseexception) {
@@ -68,20 +77,37 @@
         }
 
         this.recipes = (Map) map1.entrySet().stream().collect(ImmutableMap.toImmutableMap(Entry::getKey, (entry1) -> {
-            return ((Builder) entry1.getValue()).build();
+            return (entry1.getValue()); // CraftBukkit
         }));
-        this.byName = builder.build();
+        this.byName = Maps.newHashMap(builder.build()); // CraftBukkit
         CraftingManager.LOGGER.info("Loaded {} recipes", map1.size());
     }
 
+    // CraftBukkit start
+    public void addRecipe(IRecipe<?> irecipe) {
+        Object2ObjectLinkedOpenHashMap<MinecraftKey, IRecipe<?>> map = this.recipes.get(irecipe.getType()); // CraftBukkit
+
+        if (byName.containsKey(irecipe.getId()) || map.containsKey(irecipe.getId())) {
+            throw new IllegalStateException("Duplicate recipe ignored with ID " + irecipe.getId());
+        } else {
+            map.putAndMoveToFirst(irecipe.getId(), irecipe); // CraftBukkit - SPIGOT-4638: last recipe gets priority
+            byName.put(irecipe.getId(), irecipe);
+        }
+    }
+    // CraftBukkit end
+
     public boolean hadErrorsLoading() {
         return this.hasErrors;
     }
 
     public <C extends IInventory, T extends IRecipe<C>> Optional<T> getRecipeFor(Recipes<T> recipes, C c0, World world) {
-        return this.byType(recipes).values().stream().flatMap((irecipe) -> {
+        // CraftBukkit start
+        Optional<T> recipe = this.byType(recipes).values().stream().flatMap((irecipe) -> {
             return SystemUtils.toStream(recipes.tryMatch(irecipe, world, c0));
         }).findFirst();
+        c0.setCurrentRecipe(recipe.orElse(null)); // CraftBukkit - Clear recipe when no recipe is found
+        // CraftBukkit end
+        return recipe;
     }
 
     public <C extends IInventory, T extends IRecipe<C>> List<T> getAllRecipesFor(Recipes<T> recipes) {
@@ -99,7 +125,7 @@
     }
 
     private <C extends IInventory, T extends IRecipe<C>> Map<MinecraftKey, IRecipe<C>> byType(Recipes<T> recipes) {
-        return (Map) this.recipes.getOrDefault(recipes, Collections.emptyMap());
+        return (Map) this.recipes.getOrDefault(recipes, new Object2ObjectLinkedOpenHashMap<>()); // CraftBukkit
     }
 
     public <C extends IInventory, T extends IRecipe<C>> NonNullList<ItemStack> getRemainingItemsFor(Recipes<T> recipes, C c0, World world) {
@@ -119,7 +145,7 @@
     }
 
     public Optional<? extends IRecipe<?>> byKey(MinecraftKey minecraftkey) {
-        return Optional.ofNullable((IRecipe) this.byName.get(minecraftkey));
+        return Optional.ofNullable(this.byName.get(minecraftkey)); // CraftBukkit - decompile error
     }
 
     public Collection<IRecipe<?>> getRecipes() {
@@ -144,12 +170,12 @@
 
     public void replaceRecipes(Iterable<IRecipe<?>> iterable) {
         this.hasErrors = false;
-        Map<Recipes<?>, Map<MinecraftKey, IRecipe<?>>> map = Maps.newHashMap();
+        Map<Recipes<?>, Object2ObjectLinkedOpenHashMap<MinecraftKey, IRecipe<?>>> map = Maps.newHashMap(); // CraftBukkit
         Builder<MinecraftKey, IRecipe<?>> builder = ImmutableMap.builder();
 
         iterable.forEach((irecipe) -> {
             Map<MinecraftKey, IRecipe<?>> map1 = (Map) map.computeIfAbsent(irecipe.getType(), (recipes) -> {
-                return Maps.newHashMap();
+                return new Object2ObjectLinkedOpenHashMap<>(); // CraftBukkit
             });
             MinecraftKey minecraftkey = irecipe.getId();
             IRecipe<?> irecipe1 = (IRecipe) map1.put(minecraftkey, irecipe);
@@ -160,6 +186,18 @@
             }
         });
         this.recipes = ImmutableMap.copyOf(map);
-        this.byName = builder.build();
+        this.byName = Maps.newHashMap(builder.build()); // CraftBukkit
+    }
+
+    // CraftBukkit start
+    public void clearRecipes() {
+        this.recipes = Maps.newHashMap();
+
+        for (Recipes<?> recipeType : IRegistry.RECIPE_TYPE) {
+            this.recipes.put(recipeType, new Object2ObjectLinkedOpenHashMap<>());
+        }
+
+        this.byName = Maps.newHashMap();
     }
+    // CraftBukkit end
 }