minecraft-src/net/minecraft/data/recipes/ShapedRecipeBuilder.java

package net.minecraft.data.recipes;

import com.google.common.collect.Lists;
import com.google.common.collect.Maps;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.Objects;
import net.minecraft.advancements.Advancement;
import net.minecraft.advancements.AdvancementRequirements;
import net.minecraft.advancements.AdvancementRewards;
import net.minecraft.advancements.Criterion;
import net.minecraft.advancements.critereon.RecipeUnlockedTrigger;
import net.minecraft.core.HolderGetter;
import net.minecraft.resources.ResourceKey;
import net.minecraft.tags.TagKey;
import net.minecraft.world.item.Item;
import net.minecraft.world.item.ItemStack;
import net.minecraft.world.item.crafting.Ingredient;
import net.minecraft.world.item.crafting.Recipe;
import net.minecraft.world.item.crafting.ShapedRecipe;
import net.minecraft.world.item.crafting.ShapedRecipePattern;
import net.minecraft.world.level.ItemLike;
import org.jetbrains.annotations.Nullable;

public class ShapedRecipeBuilder implements RecipeBuilder {
	private final HolderGetter<Item> items;
	private final RecipeCategory category;
	private final Item result;
	private final int count;
	private final List<String> rows = Lists.<String>newArrayList();
	private final Map<Character, Ingredient> key = Maps.<Character, Ingredient>newLinkedHashMap();
	private final Map<String, Criterion<?>> criteria = new LinkedHashMap();
	@Nullable
	private String group;
	private boolean showNotification = true;

	private ShapedRecipeBuilder(HolderGetter<Item> items, RecipeCategory category, ItemLike result, int count) {
		this.items = items;
		this.category = category;
		this.result = result.asItem();
		this.count = count;
	}

	public static ShapedRecipeBuilder shaped(HolderGetter<Item> items, RecipeCategory category, ItemLike result) {
		return shaped(items, category, result, 1);
	}

	public static ShapedRecipeBuilder shaped(HolderGetter<Item> items, RecipeCategory category, ItemLike result, int count) {
		return new ShapedRecipeBuilder(items, category, result, count);
	}

	/**
	 * Adds a key to the recipe pattern.
	 */
	public ShapedRecipeBuilder define(Character symbol, TagKey<Item> tag) {
		return this.define(symbol, Ingredient.of(this.items.getOrThrow(tag)));
	}

	/**
	 * Adds a key to the recipe pattern.
	 */
	public ShapedRecipeBuilder define(Character symbol, ItemLike item) {
		return this.define(symbol, Ingredient.of(item));
	}

	/**
	 * Adds a key to the recipe pattern.
	 */
	public ShapedRecipeBuilder define(Character symbol, Ingredient ingredient) {
		if (this.key.containsKey(symbol)) {
			throw new IllegalArgumentException("Symbol '" + symbol + "' is already defined!");
		} else if (symbol == ' ') {
			throw new IllegalArgumentException("Symbol ' ' (whitespace) is reserved and cannot be defined");
		} else {
			this.key.put(symbol, ingredient);
			return this;
		}
	}

	/**
	 * Adds a new entry to the patterns for this recipe.
	 */
	public ShapedRecipeBuilder pattern(String pattern) {
		if (!this.rows.isEmpty() && pattern.length() != ((String)this.rows.get(0)).length()) {
			throw new IllegalArgumentException("Pattern must be the same width on every line!");
		} else {
			this.rows.add(pattern);
			return this;
		}
	}

	public ShapedRecipeBuilder unlockedBy(String name, Criterion<?> criterion) {
		this.criteria.put(name, criterion);
		return this;
	}

	public ShapedRecipeBuilder group(@Nullable String groupName) {
		this.group = groupName;
		return this;
	}

	public ShapedRecipeBuilder showNotification(boolean showNotification) {
		this.showNotification = showNotification;
		return this;
	}

	@Override
	public Item getResult() {
		return this.result;
	}

	@Override
	public void save(RecipeOutput output, ResourceKey<Recipe<?>> resourceKey) {
		ShapedRecipePattern shapedRecipePattern = this.ensureValid(resourceKey);
		Advancement.Builder builder = output.advancement()
			.addCriterion("has_the_recipe", RecipeUnlockedTrigger.unlocked(resourceKey))
			.rewards(AdvancementRewards.Builder.recipe(resourceKey))
			.requirements(AdvancementRequirements.Strategy.OR);
		this.criteria.forEach(builder::addCriterion);
		ShapedRecipe shapedRecipe = new ShapedRecipe(
			(String)Objects.requireNonNullElse(this.group, ""),
			RecipeBuilder.determineBookCategory(this.category),
			shapedRecipePattern,
			new ItemStack(this.result, this.count),
			this.showNotification
		);
		output.accept(resourceKey, shapedRecipe, builder.build(resourceKey.location().withPrefix("recipes/" + this.category.getFolderName() + "/")));
	}

	private ShapedRecipePattern ensureValid(ResourceKey<Recipe<?>> recipe) {
		if (this.criteria.isEmpty()) {
			throw new IllegalStateException("No way of obtaining recipe " + recipe.location());
		} else {
			return ShapedRecipePattern.of(this.key, this.rows);
		}
	}
}