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

package net.minecraft.world.item.crafting;

import com.mojang.serialization.Codec;
import com.mojang.serialization.MapCodec;
import com.mojang.serialization.codecs.RecordCodecBuilder;
import com.mojang.serialization.codecs.RecordCodecBuilder.Instance;
import javax.annotation.Nullable;
import net.minecraft.core.HolderLookup;
import net.minecraft.network.RegistryFriendlyByteBuf;
import net.minecraft.network.codec.ByteBufCodecs;
import net.minecraft.network.codec.StreamCodec;
import net.minecraft.world.item.ItemStack;
import net.minecraft.world.level.Level;

public abstract class SingleItemRecipe implements Recipe<SingleRecipeInput> {
    private final Ingredient input;
    private final ItemStack result;
    private final String group;
    @Nullable
    private PlacementInfo placementInfo;

    public SingleItemRecipe(String p_44419_, Ingredient p_44420_, ItemStack p_44421_) {
        this.group = p_44419_;
        this.input = p_44420_;
        this.result = p_44421_;
    }

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

    @Override
    public abstract RecipeType<? extends SingleItemRecipe> getType();

    public boolean matches(SingleRecipeInput p_365360_, Level p_370085_) {
        return this.input.test(p_365360_.item());
    }

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

    public Ingredient input() {
        return this.input;
    }

    protected ItemStack result() {
        return this.result;
    }

    @Override
    public PlacementInfo placementInfo() {
        if (this.placementInfo == null) {
            this.placementInfo = PlacementInfo.create(this.input);
        }

        return this.placementInfo;
    }

    public ItemStack assemble(SingleRecipeInput p_343460_, HolderLookup.Provider p_330907_) {
        return this.result.copy();
    }

    @FunctionalInterface
    public interface Factory<T extends SingleItemRecipe> {
        T create(String p_310227_, Ingredient p_313029_, ItemStack p_312409_);
    }

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

        protected Serializer(SingleItemRecipe.Factory<T> p_311205_) {
            this.codec = RecordCodecBuilder.mapCodec(
                p_359863_ -> p_359863_.group(
                        Codec.STRING.optionalFieldOf("group", "").forGetter(SingleItemRecipe::group),
                        Ingredient.CODEC.fieldOf("ingredient").forGetter(SingleItemRecipe::input),
                        ItemStack.STRICT_CODEC.fieldOf("result").forGetter(SingleItemRecipe::result)
                    )
                    .apply(p_359863_, p_311205_::create)
            );
            this.streamCodec = StreamCodec.composite(
                ByteBufCodecs.STRING_UTF8,
                SingleItemRecipe::group,
                Ingredient.CONTENTS_STREAM_CODEC,
                SingleItemRecipe::input,
                ItemStack.STREAM_CODEC,
                SingleItemRecipe::result,
                p_311205_::create
            );
        }

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

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