Code/net/minecraft/world/item/crafting/CustomRecipe.java

package net.minecraft.world.item.crafting;

import com.mojang.serialization.MapCodec;
import com.mojang.serialization.codecs.RecordCodecBuilder;
import com.mojang.serialization.codecs.RecordCodecBuilder.Instance;
import net.minecraft.network.RegistryFriendlyByteBuf;
import net.minecraft.network.codec.StreamCodec;

public abstract class CustomRecipe implements CraftingRecipe {
    private final CraftingBookCategory category;

    public CustomRecipe(CraftingBookCategory p_249010_) {
        this.category = p_249010_;
    }

    @Override
    public boolean isSpecial() {
        return true;
    }

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

    @Override
    public PlacementInfo placementInfo() {
        return PlacementInfo.NOT_PLACEABLE;
    }

    @Override
    public abstract RecipeSerializer<? extends CustomRecipe> getSerializer();

    public static class Serializer<T extends CraftingRecipe> implements RecipeSerializer<T> {
        private final MapCodec<T> codec;
        private final StreamCodec<RegistryFriendlyByteBuf, T> streamCodec;

        public Serializer(CustomRecipe.Serializer.Factory<T> p_361018_) {
            this.codec = RecordCodecBuilder.mapCodec(
                p_362686_ -> p_362686_.group(
                        CraftingBookCategory.CODEC.fieldOf("category").orElse(CraftingBookCategory.MISC).forGetter(CraftingRecipe::category)
                    )
                    .apply(p_362686_, p_361018_::create)
            );
            this.streamCodec = StreamCodec.composite(CraftingBookCategory.STREAM_CODEC, CraftingRecipe::category, p_361018_::create);
        }

        @Override
        public MapCodec<T> codec() {
            return this.codec;
        }

        @Override
        public StreamCodec<RegistryFriendlyByteBuf, T> streamCodec() {
            return this.streamCodec;
        }

        @FunctionalInterface
        public interface Factory<T extends CraftingRecipe> {
            T create(CraftingBookCategory p_369875_);
        }
    }
}