minecraft-src/net/minecraft/commands/arguments/ResourceArgument.java

package net.minecraft.commands.arguments;

import com.google.gson.JsonObject;
import com.mojang.brigadier.StringReader;
import com.mojang.brigadier.arguments.ArgumentType;
import com.mojang.brigadier.context.CommandContext;
import com.mojang.brigadier.exceptions.CommandSyntaxException;
import com.mojang.brigadier.exceptions.Dynamic2CommandExceptionType;
import com.mojang.brigadier.exceptions.Dynamic3CommandExceptionType;
import com.mojang.brigadier.exceptions.DynamicCommandExceptionType;
import com.mojang.brigadier.suggestion.Suggestions;
import com.mojang.brigadier.suggestion.SuggestionsBuilder;
import java.util.Arrays;
import java.util.Collection;
import java.util.concurrent.CompletableFuture;
import net.minecraft.commands.CommandBuildContext;
import net.minecraft.commands.CommandSourceStack;
import net.minecraft.commands.SharedSuggestionProvider;
import net.minecraft.commands.synchronization.ArgumentTypeInfo;
import net.minecraft.core.Holder;
import net.minecraft.core.HolderLookup;
import net.minecraft.core.Registry;
import net.minecraft.core.registries.Registries;
import net.minecraft.network.FriendlyByteBuf;
import net.minecraft.network.chat.Component;
import net.minecraft.resources.ResourceKey;
import net.minecraft.resources.ResourceLocation;
import net.minecraft.world.effect.MobEffect;
import net.minecraft.world.entity.EntityType;
import net.minecraft.world.entity.ai.attributes.Attribute;
import net.minecraft.world.item.enchantment.Enchantment;
import net.minecraft.world.level.levelgen.feature.ConfiguredFeature;
import net.minecraft.world.level.levelgen.structure.Structure;

public class ResourceArgument<T> implements ArgumentType<Holder.Reference<T>> {
	private static final Collection<String> EXAMPLES = Arrays.asList("foo", "foo:bar", "012");
	private static final DynamicCommandExceptionType ERROR_NOT_SUMMONABLE_ENTITY = new DynamicCommandExceptionType(
		object -> Component.translatableEscape("entity.not_summonable", object)
	);
	public static final Dynamic2CommandExceptionType ERROR_UNKNOWN_RESOURCE = new Dynamic2CommandExceptionType(
		(object, object2) -> Component.translatableEscape("argument.resource.not_found", object, object2)
	);
	public static final Dynamic3CommandExceptionType ERROR_INVALID_RESOURCE_TYPE = new Dynamic3CommandExceptionType(
		(object, object2, object3) -> Component.translatableEscape("argument.resource.invalid_type", object, object2, object3)
	);
	final ResourceKey<? extends Registry<T>> registryKey;
	private final HolderLookup<T> registryLookup;

	public ResourceArgument(CommandBuildContext context, ResourceKey<? extends Registry<T>> registryKey) {
		this.registryKey = registryKey;
		this.registryLookup = context.lookupOrThrow(registryKey);
	}

	public static <T> ResourceArgument<T> resource(CommandBuildContext context, ResourceKey<? extends Registry<T>> registryKey) {
		return new ResourceArgument<>(context, registryKey);
	}

	public static <T> Holder.Reference<T> getResource(CommandContext<CommandSourceStack> context, String argument, ResourceKey<Registry<T>> registryKey) throws CommandSyntaxException {
		Holder.Reference<T> reference = context.getArgument(argument, Holder.Reference.class);
		ResourceKey<?> resourceKey = reference.key();
		if (resourceKey.isFor(registryKey)) {
			return reference;
		} else {
			throw ERROR_INVALID_RESOURCE_TYPE.create(resourceKey.location(), resourceKey.registry(), registryKey.location());
		}
	}

	public static Holder.Reference<Attribute> getAttribute(CommandContext<CommandSourceStack> context, String argument) throws CommandSyntaxException {
		return getResource(context, argument, Registries.ATTRIBUTE);
	}

	public static Holder.Reference<ConfiguredFeature<?, ?>> getConfiguredFeature(CommandContext<CommandSourceStack> context, String argument) throws CommandSyntaxException {
		return getResource(context, argument, Registries.CONFIGURED_FEATURE);
	}

	public static Holder.Reference<Structure> getStructure(CommandContext<CommandSourceStack> context, String argument) throws CommandSyntaxException {
		return getResource(context, argument, Registries.STRUCTURE);
	}

	public static Holder.Reference<EntityType<?>> getEntityType(CommandContext<CommandSourceStack> context, String argument) throws CommandSyntaxException {
		return getResource(context, argument, Registries.ENTITY_TYPE);
	}

	public static Holder.Reference<EntityType<?>> getSummonableEntityType(CommandContext<CommandSourceStack> context, String argument) throws CommandSyntaxException {
		Holder.Reference<EntityType<?>> reference = getResource(context, argument, Registries.ENTITY_TYPE);
		if (!reference.value().canSummon()) {
			throw ERROR_NOT_SUMMONABLE_ENTITY.create(reference.key().location().toString());
		} else {
			return reference;
		}
	}

	public static Holder.Reference<MobEffect> getMobEffect(CommandContext<CommandSourceStack> context, String argument) throws CommandSyntaxException {
		return getResource(context, argument, Registries.MOB_EFFECT);
	}

	public static Holder.Reference<Enchantment> getEnchantment(CommandContext<CommandSourceStack> context, String argument) throws CommandSyntaxException {
		return getResource(context, argument, Registries.ENCHANTMENT);
	}

	public Holder.Reference<T> parse(StringReader builder) throws CommandSyntaxException {
		ResourceLocation resourceLocation = ResourceLocation.read(builder);
		ResourceKey<T> resourceKey = ResourceKey.create(this.registryKey, resourceLocation);
		return (Holder.Reference<T>)this.registryLookup
			.get(resourceKey)
			.orElseThrow(() -> ERROR_UNKNOWN_RESOURCE.createWithContext(builder, resourceLocation, this.registryKey.location()));
	}

	@Override
	public <S> CompletableFuture<Suggestions> listSuggestions(CommandContext<S> commandContext, SuggestionsBuilder suggestionsBuilder) {
		return SharedSuggestionProvider.listSuggestions(commandContext, suggestionsBuilder, this.registryKey, SharedSuggestionProvider.ElementSuggestionType.ELEMENTS);
	}

	@Override
	public Collection<String> getExamples() {
		return EXAMPLES;
	}

	public static class Info<T> implements ArgumentTypeInfo<ResourceArgument<T>, ResourceArgument.Info<T>.Template> {
		public void serializeToNetwork(ResourceArgument.Info<T>.Template template, FriendlyByteBuf buffer) {
			buffer.writeResourceKey(template.registryKey);
		}

		public ResourceArgument.Info<T>.Template deserializeFromNetwork(FriendlyByteBuf buffer) {
			return new ResourceArgument.Info.Template(buffer.readRegistryKey());
		}

		public void serializeToJson(ResourceArgument.Info<T>.Template template, JsonObject json) {
			json.addProperty("registry", template.registryKey.location().toString());
		}

		public ResourceArgument.Info<T>.Template unpack(ResourceArgument<T> argument) {
			return new ResourceArgument.Info.Template(argument.registryKey);
		}

		public final class Template implements ArgumentTypeInfo.Template<ResourceArgument<T>> {
			final ResourceKey<? extends Registry<T>> registryKey;

			Template(final ResourceKey<? extends Registry<T>> registryKey) {
				this.registryKey = registryKey;
			}

			public ResourceArgument<T> instantiate(CommandBuildContext context) {
				return new ResourceArgument<>(context, this.registryKey);
			}

			@Override
			public ArgumentTypeInfo<ResourceArgument<T>, ?> type() {
				return Info.this;
			}
		}
	}
}