minecraft-src/net/minecraft/world/item/crafting/ShapelessRecipe.java

package net.minecraft.world.item.crafting;

import com.mojang.serialization.Codec;
import com.mojang.serialization.DataResult;
import com.mojang.serialization.MapCodec;
import com.mojang.serialization.codecs.RecordCodecBuilder;
import net.minecraft.core.HolderLookup;
import net.minecraft.core.NonNullList;
import net.minecraft.network.RegistryFriendlyByteBuf;
import net.minecraft.network.codec.StreamCodec;
import net.minecraft.world.item.ItemStack;
import net.minecraft.world.level.Level;

public class ShapelessRecipe implements CraftingRecipe {
	final String group;
	final CraftingBookCategory category;
	final ItemStack result;
	final NonNullList<Ingredient> ingredients;

	public ShapelessRecipe(String group, CraftingBookCategory category, ItemStack result, NonNullList<Ingredient> ingredients) {
		this.group = group;
		this.category = category;
		this.result = result;
		this.ingredients = ingredients;
	}

	@Override
	public RecipeSerializer<?> getSerializer() {
		return RecipeSerializer.SHAPELESS_RECIPE;
	}

	@Override
	public String getGroup() {
		return this.group;
	}

	@Override
	public CraftingBookCategory category() {
		return this.category;
	}

	@Override
	public ItemStack getResultItem(HolderLookup.Provider registries) {
		return this.result;
	}

	@Override
	public NonNullList<Ingredient> getIngredients() {
		return this.ingredients;
	}

	public boolean matches(CraftingInput input, Level level) {
		if (input.ingredientCount() != this.ingredients.size()) {
			return false;
		} else {
			return input.size() == 1 && this.ingredients.size() == 1
				? ((Ingredient)this.ingredients.getFirst()).test(input.getItem(0))
				: input.stackedContents().canCraft(this, null);
		}
	}

	public ItemStack assemble(CraftingInput input, HolderLookup.Provider registries) {
		return this.result.copy();
	}

	@Override
	public boolean canCraftInDimensions(int width, int height) {
		return width * height >= this.ingredients.size();
	}

	public static class Serializer implements RecipeSerializer<ShapelessRecipe> {
		private static final MapCodec<ShapelessRecipe> CODEC = RecordCodecBuilder.mapCodec(
			instance -> instance.group(
					Codec.STRING.optionalFieldOf("group", "").forGetter(shapelessRecipe -> shapelessRecipe.group),
					CraftingBookCategory.CODEC.fieldOf("category").orElse(CraftingBookCategory.MISC).forGetter(shapelessRecipe -> shapelessRecipe.category),
					ItemStack.STRICT_CODEC.fieldOf("result").forGetter(shapelessRecipe -> shapelessRecipe.result),
					Ingredient.CODEC_NONEMPTY
						.listOf()
						.fieldOf("ingredients")
						.flatXmap(
							list -> {
								Ingredient[] ingredients = (Ingredient[])list.stream().filter(ingredient -> !ingredient.isEmpty()).toArray(Ingredient[]::new);
								if (ingredients.length == 0) {
									return DataResult.error(() -> "No ingredients for shapeless recipe");
								} else {
									return ingredients.length > 9
										? DataResult.error(() -> "Too many ingredients for shapeless recipe")
										: DataResult.success(NonNullList.of(Ingredient.EMPTY, ingredients));
								}
							},
							DataResult::success
						)
						.forGetter(shapelessRecipe -> shapelessRecipe.ingredients)
				)
				.apply(instance, ShapelessRecipe::new)
		);
		public static final StreamCodec<RegistryFriendlyByteBuf, ShapelessRecipe> STREAM_CODEC = StreamCodec.of(
			ShapelessRecipe.Serializer::toNetwork, ShapelessRecipe.Serializer::fromNetwork
		);

		@Override
		public MapCodec<ShapelessRecipe> codec() {
			return CODEC;
		}

		@Override
		public StreamCodec<RegistryFriendlyByteBuf, ShapelessRecipe> streamCodec() {
			return STREAM_CODEC;
		}

		private static ShapelessRecipe fromNetwork(RegistryFriendlyByteBuf buffer) {
			String string = buffer.readUtf();
			CraftingBookCategory craftingBookCategory = buffer.readEnum(CraftingBookCategory.class);
			int i = buffer.readVarInt();
			NonNullList<Ingredient> nonNullList = NonNullList.withSize(i, Ingredient.EMPTY);
			nonNullList.replaceAll(ingredient -> Ingredient.CONTENTS_STREAM_CODEC.decode(buffer));
			ItemStack itemStack = ItemStack.STREAM_CODEC.decode(buffer);
			return new ShapelessRecipe(string, craftingBookCategory, itemStack, nonNullList);
		}

		private static void toNetwork(RegistryFriendlyByteBuf buffer, ShapelessRecipe recipe) {
			buffer.writeUtf(recipe.group);
			buffer.writeEnum(recipe.category);
			buffer.writeVarInt(recipe.ingredients.size());

			for (Ingredient ingredient : recipe.ingredients) {
				Ingredient.CONTENTS_STREAM_CODEC.encode(buffer, ingredient);
			}

			ItemStack.STREAM_CODEC.encode(buffer, recipe.result);
		}
	}
}