Code/net/minecraft/world/level/chunk/ChunkAccess.java

package net.minecraft.world.level.chunk;

import com.google.common.collect.Maps;
import com.google.common.collect.Sets;
import com.mojang.logging.LogUtils;
import it.unimi.dsi.fastutil.longs.LongOpenHashSet;
import it.unimi.dsi.fastutil.longs.LongSet;
import it.unimi.dsi.fastutil.objects.Object2ObjectOpenHashMap;
import it.unimi.dsi.fastutil.shorts.ShortArrayList;
import it.unimi.dsi.fastutil.shorts.ShortList;
import java.util.Collection;
import java.util.Collections;
import java.util.EnumSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.Map.Entry;
import java.util.function.BiConsumer;
import java.util.function.Function;
import java.util.function.Predicate;
import java.util.function.Supplier;
import javax.annotation.Nullable;
import net.minecraft.CrashReport;
import net.minecraft.CrashReportCategory;
import net.minecraft.ReportedException;
import net.minecraft.SharedConstants;
import net.minecraft.core.BlockPos;
import net.minecraft.core.Holder;
import net.minecraft.core.HolderLookup;
import net.minecraft.core.QuartPos;
import net.minecraft.core.Registry;
import net.minecraft.core.SectionPos;
import net.minecraft.nbt.CompoundTag;
import net.minecraft.util.Mth;
import net.minecraft.world.entity.Entity;
import net.minecraft.world.level.ChunkPos;
import net.minecraft.world.level.LevelHeightAccessor;
import net.minecraft.world.level.biome.Biome;
import net.minecraft.world.level.biome.BiomeGenerationSettings;
import net.minecraft.world.level.biome.BiomeManager;
import net.minecraft.world.level.biome.BiomeResolver;
import net.minecraft.world.level.biome.Climate;
import net.minecraft.world.level.block.Block;
import net.minecraft.world.level.block.entity.BlockEntity;
import net.minecraft.world.level.block.state.BlockState;
import net.minecraft.world.level.chunk.status.ChunkStatus;
import net.minecraft.world.level.gameevent.GameEventListenerRegistry;
import net.minecraft.world.level.levelgen.BelowZeroRetrogen;
import net.minecraft.world.level.levelgen.Heightmap;
import net.minecraft.world.level.levelgen.NoiseChunk;
import net.minecraft.world.level.levelgen.blending.BlendingData;
import net.minecraft.world.level.levelgen.structure.Structure;
import net.minecraft.world.level.levelgen.structure.StructureStart;
import net.minecraft.world.level.lighting.ChunkSkyLightSources;
import net.minecraft.world.level.material.Fluid;
import net.minecraft.world.ticks.SavedTick;
import net.minecraft.world.ticks.TickContainerAccess;
import org.slf4j.Logger;

public abstract class ChunkAccess implements BiomeManager.NoiseBiomeSource, LightChunk, StructureAccess {
    public static final int NO_FILLED_SECTION = -1;
    private static final Logger LOGGER = LogUtils.getLogger();
    private static final LongSet EMPTY_REFERENCE_SET = new LongOpenHashSet();
    protected final ShortList[] postProcessing;
    private volatile boolean unsaved;
    private volatile boolean isLightCorrect;
    protected final ChunkPos chunkPos;
    private long inhabitedTime;
    @Nullable
    @Deprecated
    private BiomeGenerationSettings carverBiomeSettings;
    @Nullable
    protected NoiseChunk noiseChunk;
    protected final UpgradeData upgradeData;
    @Nullable
    protected BlendingData blendingData;
    protected final Map<Heightmap.Types, Heightmap> heightmaps = Maps.newEnumMap(Heightmap.Types.class);
    protected ChunkSkyLightSources skyLightSources;
    private final Map<Structure, StructureStart> structureStarts = Maps.newHashMap();
    private final Map<Structure, LongSet> structuresRefences = Maps.newHashMap();
    protected final Map<BlockPos, CompoundTag> pendingBlockEntities = Maps.newHashMap();
    protected final Map<BlockPos, BlockEntity> blockEntities = new Object2ObjectOpenHashMap<>();
    protected final LevelHeightAccessor levelHeightAccessor;
    protected final LevelChunkSection[] sections;

    public ChunkAccess(
        ChunkPos p_187621_,
        UpgradeData p_187622_,
        LevelHeightAccessor p_187623_,
        Registry<Biome> p_187624_,
        long p_187625_,
        @Nullable LevelChunkSection[] p_187626_,
        @Nullable BlendingData p_187627_
    ) {
        this.chunkPos = p_187621_;
        this.upgradeData = p_187622_;
        this.levelHeightAccessor = p_187623_;
        this.sections = new LevelChunkSection[p_187623_.getSectionsCount()];
        this.inhabitedTime = p_187625_;
        this.postProcessing = new ShortList[p_187623_.getSectionsCount()];
        this.blendingData = p_187627_;
        this.skyLightSources = new ChunkSkyLightSources(p_187623_);
        if (p_187626_ != null) {
            if (this.sections.length == p_187626_.length) {
                System.arraycopy(p_187626_, 0, this.sections, 0, this.sections.length);
            } else {
                LOGGER.warn("Could not set level chunk sections, array length is {} instead of {}", p_187626_.length, this.sections.length);
            }
        }

        replaceMissingSections(p_187624_, this.sections);
    }

    private static void replaceMissingSections(Registry<Biome> p_281389_, LevelChunkSection[] p_282796_) {
        for (int i = 0; i < p_282796_.length; i++) {
            if (p_282796_[i] == null) {
                p_282796_[i] = new LevelChunkSection(p_281389_);
            }
        }
    }

    public GameEventListenerRegistry getListenerRegistry(int p_251437_) {
        return GameEventListenerRegistry.NOOP;
    }

    @Nullable
    public BlockState setBlockState(BlockPos p_391532_, BlockState p_391593_) {
        return this.setBlockState(p_391532_, p_391593_, 3);
    }

    @Nullable
    public abstract BlockState setBlockState(BlockPos p_62087_, BlockState p_62088_, int p_392516_);

    public abstract void setBlockEntity(BlockEntity p_156114_);

    public abstract void addEntity(Entity p_62078_);

    public int getHighestFilledSectionIndex() {
        LevelChunkSection[] alevelchunksection = this.getSections();

        for (int i = alevelchunksection.length - 1; i >= 0; i--) {
            LevelChunkSection levelchunksection = alevelchunksection[i];
            if (!levelchunksection.hasOnlyAir()) {
                return i;
            }
        }

        return -1;
    }

    @Deprecated(
        forRemoval = true
    )
    public int getHighestSectionPosition() {
        int i = this.getHighestFilledSectionIndex();
        return i == -1 ? this.getMinY() : SectionPos.sectionToBlockCoord(this.getSectionYFromSectionIndex(i));
    }

    public Set<BlockPos> getBlockEntitiesPos() {
        Set<BlockPos> set = Sets.newHashSet(this.pendingBlockEntities.keySet());
        set.addAll(this.blockEntities.keySet());
        return set;
    }

    public LevelChunkSection[] getSections() {
        return this.sections;
    }

    public LevelChunkSection getSection(int p_187657_) {
        return this.getSections()[p_187657_];
    }

    public Collection<Entry<Heightmap.Types, Heightmap>> getHeightmaps() {
        return Collections.unmodifiableSet(this.heightmaps.entrySet());
    }

    public void setHeightmap(Heightmap.Types p_62083_, long[] p_62084_) {
        this.getOrCreateHeightmapUnprimed(p_62083_).setRawData(this, p_62083_, p_62084_);
    }

    public Heightmap getOrCreateHeightmapUnprimed(Heightmap.Types p_62079_) {
        return this.heightmaps.computeIfAbsent(p_62079_, p_187665_ -> new Heightmap(this, p_187665_));
    }

    public boolean hasPrimedHeightmap(Heightmap.Types p_187659_) {
        return this.heightmaps.get(p_187659_) != null;
    }

    public int getHeight(Heightmap.Types p_62080_, int p_62081_, int p_62082_) {
        Heightmap heightmap = this.heightmaps.get(p_62080_);
        if (heightmap == null) {
            if (SharedConstants.IS_RUNNING_IN_IDE && this instanceof LevelChunk) {
                LOGGER.error("Unprimed heightmap: " + p_62080_ + " " + p_62081_ + " " + p_62082_);
            }

            Heightmap.primeHeightmaps(this, EnumSet.of(p_62080_));
            heightmap = this.heightmaps.get(p_62080_);
        }

        return heightmap.getFirstAvailable(p_62081_ & 15, p_62082_ & 15) - 1;
    }

    public ChunkPos getPos() {
        return this.chunkPos;
    }

    @Nullable
    @Override
    public StructureStart getStartForStructure(Structure p_223005_) {
        return this.structureStarts.get(p_223005_);
    }

    @Override
    public void setStartForStructure(Structure p_223010_, StructureStart p_223011_) {
        this.structureStarts.put(p_223010_, p_223011_);
        this.markUnsaved();
    }

    public Map<Structure, StructureStart> getAllStarts() {
        return Collections.unmodifiableMap(this.structureStarts);
    }

    public void setAllStarts(Map<Structure, StructureStart> p_62090_) {
        this.structureStarts.clear();
        this.structureStarts.putAll(p_62090_);
        this.markUnsaved();
    }

    @Override
    public LongSet getReferencesForStructure(Structure p_223017_) {
        return this.structuresRefences.getOrDefault(p_223017_, EMPTY_REFERENCE_SET);
    }

    @Override
    public void addReferenceForStructure(Structure p_223007_, long p_223008_) {
        this.structuresRefences.computeIfAbsent(p_223007_, p_223019_ -> new LongOpenHashSet()).add(p_223008_);
        this.markUnsaved();
    }

    @Override
    public Map<Structure, LongSet> getAllReferences() {
        return Collections.unmodifiableMap(this.structuresRefences);
    }

    @Override
    public void setAllReferences(Map<Structure, LongSet> p_187663_) {
        this.structuresRefences.clear();
        this.structuresRefences.putAll(p_187663_);
        this.markUnsaved();
    }

    public boolean isYSpaceEmpty(int p_62075_, int p_62076_) {
        if (p_62075_ < this.getMinY()) {
            p_62075_ = this.getMinY();
        }

        if (p_62076_ > this.getMaxY()) {
            p_62076_ = this.getMaxY();
        }

        for (int i = p_62075_; i <= p_62076_; i += 16) {
            if (!this.getSection(this.getSectionIndex(i)).hasOnlyAir()) {
                return false;
            }
        }

        return true;
    }

    public boolean isSectionEmpty(int p_342699_) {
        return this.getSection(this.getSectionIndexFromSectionY(p_342699_)).hasOnlyAir();
    }

    public void markUnsaved() {
        this.unsaved = true;
    }

    public boolean tryMarkSaved() {
        if (this.unsaved) {
            this.unsaved = false;
            return true;
        } else {
            return false;
        }
    }

    public boolean isUnsaved() {
        return this.unsaved;
    }

    public abstract ChunkStatus getPersistedStatus();

    public ChunkStatus getHighestGeneratedStatus() {
        ChunkStatus chunkstatus = this.getPersistedStatus();
        BelowZeroRetrogen belowzeroretrogen = this.getBelowZeroRetrogen();
        if (belowzeroretrogen != null) {
            ChunkStatus chunkstatus1 = belowzeroretrogen.targetStatus();
            return ChunkStatus.max(chunkstatus1, chunkstatus);
        } else {
            return chunkstatus;
        }
    }

    public abstract void removeBlockEntity(BlockPos p_62101_);

    public void markPosForPostprocessing(BlockPos p_62102_) {
        LOGGER.warn("Trying to mark a block for PostProcessing @ {}, but this operation is not supported.", p_62102_);
    }

    public ShortList[] getPostProcessing() {
        return this.postProcessing;
    }

    public void addPackedPostProcess(ShortList p_361114_, int p_62093_) {
        getOrCreateOffsetList(this.getPostProcessing(), p_62093_).addAll(p_361114_);
    }

    public void setBlockEntityNbt(CompoundTag p_62091_) {
        BlockPos blockpos = BlockEntity.getPosFromTag(this.chunkPos, p_62091_);
        if (!this.blockEntities.containsKey(blockpos)) {
            this.pendingBlockEntities.put(blockpos, p_62091_);
        }
    }

    @Nullable
    public CompoundTag getBlockEntityNbt(BlockPos p_62103_) {
        return this.pendingBlockEntities.get(p_62103_);
    }

    @Nullable
    public abstract CompoundTag getBlockEntityNbtForSaving(BlockPos p_62104_, HolderLookup.Provider p_328057_);

    @Override
    public final void findBlockLightSources(BiConsumer<BlockPos, BlockState> p_285269_) {
        this.findBlocks(p_360555_ -> p_360555_.getLightEmission() != 0, p_285269_);
    }

    public void findBlocks(Predicate<BlockState> p_285343_, BiConsumer<BlockPos, BlockState> p_285030_) {
        BlockPos.MutableBlockPos blockpos$mutableblockpos = new BlockPos.MutableBlockPos();

        for (int i = this.getMinSectionY(); i <= this.getMaxSectionY(); i++) {
            LevelChunkSection levelchunksection = this.getSection(this.getSectionIndexFromSectionY(i));
            if (levelchunksection.maybeHas(p_285343_)) {
                BlockPos blockpos = SectionPos.of(this.chunkPos, i).origin();

                for (int j = 0; j < 16; j++) {
                    for (int k = 0; k < 16; k++) {
                        for (int l = 0; l < 16; l++) {
                            BlockState blockstate = levelchunksection.getBlockState(l, j, k);
                            if (p_285343_.test(blockstate)) {
                                p_285030_.accept(blockpos$mutableblockpos.setWithOffset(blockpos, l, j, k), blockstate);
                            }
                        }
                    }
                }
            }
        }
    }

    public abstract TickContainerAccess<Block> getBlockTicks();

    public abstract TickContainerAccess<Fluid> getFluidTicks();

    public boolean canBeSerialized() {
        return true;
    }

    public abstract ChunkAccess.PackedTicks getTicksForSerialization(long p_369860_);

    public UpgradeData getUpgradeData() {
        return this.upgradeData;
    }

    public boolean isOldNoiseGeneration() {
        return this.blendingData != null;
    }

    @Nullable
    public BlendingData getBlendingData() {
        return this.blendingData;
    }

    public long getInhabitedTime() {
        return this.inhabitedTime;
    }

    public void incrementInhabitedTime(long p_187633_) {
        this.inhabitedTime += p_187633_;
    }

    public void setInhabitedTime(long p_62099_) {
        this.inhabitedTime = p_62099_;
    }

    public static ShortList getOrCreateOffsetList(ShortList[] p_62096_, int p_62097_) {
        if (p_62096_[p_62097_] == null) {
            p_62096_[p_62097_] = new ShortArrayList();
        }

        return p_62096_[p_62097_];
    }

    public boolean isLightCorrect() {
        return this.isLightCorrect;
    }

    public void setLightCorrect(boolean p_62100_) {
        this.isLightCorrect = p_62100_;
        this.markUnsaved();
    }

    @Override
    public int getMinY() {
        return this.levelHeightAccessor.getMinY();
    }

    @Override
    public int getHeight() {
        return this.levelHeightAccessor.getHeight();
    }

    public NoiseChunk getOrCreateNoiseChunk(Function<ChunkAccess, NoiseChunk> p_223013_) {
        if (this.noiseChunk == null) {
            this.noiseChunk = p_223013_.apply(this);
        }

        return this.noiseChunk;
    }

    @Deprecated
    public BiomeGenerationSettings carverBiome(Supplier<BiomeGenerationSettings> p_223015_) {
        if (this.carverBiomeSettings == null) {
            this.carverBiomeSettings = p_223015_.get();
        }

        return this.carverBiomeSettings;
    }

    @Override
    public Holder<Biome> getNoiseBiome(int p_204347_, int p_204348_, int p_204349_) {
        try {
            int i = QuartPos.fromBlock(this.getMinY());
            int k = i + QuartPos.fromBlock(this.getHeight()) - 1;
            int l = Mth.clamp(p_204348_, i, k);
            int j = this.getSectionIndex(QuartPos.toBlock(l));
            return this.sections[j].getNoiseBiome(p_204347_ & 3, l & 3, p_204349_ & 3);
        } catch (Throwable throwable) {
            CrashReport crashreport = CrashReport.forThrowable(throwable, "Getting biome");
            CrashReportCategory crashreportcategory = crashreport.addCategory("Biome being got");
            crashreportcategory.setDetail("Location", () -> CrashReportCategory.formatLocation(this, p_204347_, p_204348_, p_204349_));
            throw new ReportedException(crashreport);
        }
    }

    public void fillBiomesFromNoise(BiomeResolver p_187638_, Climate.Sampler p_187639_) {
        ChunkPos chunkpos = this.getPos();
        int i = QuartPos.fromBlock(chunkpos.getMinBlockX());
        int j = QuartPos.fromBlock(chunkpos.getMinBlockZ());
        LevelHeightAccessor levelheightaccessor = this.getHeightAccessorForGeneration();

        for (int k = levelheightaccessor.getMinSectionY(); k <= levelheightaccessor.getMaxSectionY(); k++) {
            LevelChunkSection levelchunksection = this.getSection(this.getSectionIndexFromSectionY(k));
            int l = QuartPos.fromSection(k);
            levelchunksection.fillBiomesFromNoise(p_187638_, p_187639_, i, l, j);
        }
    }

    public boolean hasAnyStructureReferences() {
        return !this.getAllReferences().isEmpty();
    }

    @Nullable
    public BelowZeroRetrogen getBelowZeroRetrogen() {
        return null;
    }

    public boolean isUpgrading() {
        return this.getBelowZeroRetrogen() != null;
    }

    public LevelHeightAccessor getHeightAccessorForGeneration() {
        return this;
    }

    public void initializeLightSources() {
        this.skyLightSources.fillFrom(this);
    }

    @Override
    public ChunkSkyLightSources getSkyLightSources() {
        return this.skyLightSources;
    }

    public record PackedTicks(List<SavedTick<Block>> blocks, List<SavedTick<Fluid>> fluids) {
    }
}