Code/net/minecraft/server/packs/repository/BuiltInPackSource.java

package net.minecraft.server.packs.repository;

import com.mojang.logging.LogUtils;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.HashMap;
import java.util.Map;
import java.util.function.BiConsumer;
import java.util.function.Consumer;
import java.util.function.Function;
import javax.annotation.Nullable;
import net.minecraft.network.chat.Component;
import net.minecraft.resources.ResourceLocation;
import net.minecraft.server.packs.PackLocationInfo;
import net.minecraft.server.packs.PackResources;
import net.minecraft.server.packs.PackType;
import net.minecraft.server.packs.VanillaPackResources;
import net.minecraft.world.level.validation.DirectoryValidator;
import org.apache.commons.lang3.StringUtils;
import org.slf4j.Logger;

public abstract class BuiltInPackSource implements RepositorySource {
    private static final Logger LOGGER = LogUtils.getLogger();
    public static final String VANILLA_ID = "vanilla";
    public static final String TESTS_ID = "tests";
    public static final KnownPack CORE_PACK_INFO = KnownPack.vanilla("core");
    private final PackType packType;
    private final VanillaPackResources vanillaPack;
    private final ResourceLocation packDir;
    private final DirectoryValidator validator;

    public BuiltInPackSource(PackType p_249137_, VanillaPackResources p_250453_, ResourceLocation p_251151_, DirectoryValidator p_300643_) {
        this.packType = p_249137_;
        this.vanillaPack = p_250453_;
        this.packDir = p_251151_;
        this.validator = p_300643_;
    }

    @Override
    public void loadPacks(Consumer<Pack> p_250708_) {
        Pack pack = this.createVanillaPack(this.vanillaPack);
        if (pack != null) {
            p_250708_.accept(pack);
        }

        this.listBundledPacks(p_250708_);
    }

    @Nullable
    protected abstract Pack createVanillaPack(PackResources p_251690_);

    protected abstract Component getPackTitle(String p_251850_);

    public VanillaPackResources getVanillaPack() {
        return this.vanillaPack;
    }

    private void listBundledPacks(Consumer<Pack> p_249128_) {
        Map<String, Function<String, Pack>> map = new HashMap<>();
        this.populatePackList(map::put);
        map.forEach((p_250371_, p_250946_) -> {
            Pack pack = p_250946_.apply(p_250371_);
            if (pack != null) {
                p_249128_.accept(pack);
            }
        });
    }

    protected void populatePackList(BiConsumer<String, Function<String, Pack>> p_250341_) {
        this.vanillaPack.listRawPaths(this.packType, this.packDir, p_250248_ -> this.discoverPacksInPath(p_250248_, p_250341_));
    }

    protected void discoverPacksInPath(@Nullable Path p_250013_, BiConsumer<String, Function<String, Pack>> p_249898_) {
        if (p_250013_ != null && Files.isDirectory(p_250013_)) {
            try {
                FolderRepositorySource.discoverPacks(
                    p_250013_,
                    this.validator,
                    (p_252012_, p_249772_) -> p_249898_.accept(
                        pathToId(p_252012_), p_250601_ -> this.createBuiltinPack(p_250601_, p_249772_, this.getPackTitle(p_250601_))
                    )
                );
            } catch (IOException ioexception) {
                LOGGER.warn("Failed to discover packs in {}", p_250013_, ioexception);
            }
        }
    }

    private static String pathToId(Path p_252048_) {
        return StringUtils.removeEnd(p_252048_.getFileName().toString(), ".zip");
    }

    @Nullable
    protected abstract Pack createBuiltinPack(String p_249992_, Pack.ResourcesSupplier p_248670_, Component p_252197_);

    protected static Pack.ResourcesSupplier fixedResources(final PackResources p_298206_) {
        return new Pack.ResourcesSupplier() {
            @Override
            public PackResources openPrimary(PackLocationInfo p_333958_) {
                return p_298206_;
            }

            @Override
            public PackResources openFull(PackLocationInfo p_336095_, Pack.Metadata p_328489_) {
                return p_298206_;
            }
        };
    }
}