Code/net/minecraft/world/level/block/entity/BarrelBlockEntity.java

package net.minecraft.world.level.block.entity;

import net.minecraft.core.BlockPos;
import net.minecraft.core.HolderLookup;
import net.minecraft.core.NonNullList;
import net.minecraft.core.Vec3i;
import net.minecraft.nbt.CompoundTag;
import net.minecraft.network.chat.Component;
import net.minecraft.sounds.SoundEvent;
import net.minecraft.sounds.SoundEvents;
import net.minecraft.sounds.SoundSource;
import net.minecraft.world.Container;
import net.minecraft.world.ContainerHelper;
import net.minecraft.world.entity.player.Inventory;
import net.minecraft.world.entity.player.Player;
import net.minecraft.world.inventory.AbstractContainerMenu;
import net.minecraft.world.inventory.ChestMenu;
import net.minecraft.world.item.ItemStack;
import net.minecraft.world.level.Level;
import net.minecraft.world.level.block.BarrelBlock;
import net.minecraft.world.level.block.state.BlockState;

public class BarrelBlockEntity extends RandomizableContainerBlockEntity {
    private NonNullList<ItemStack> items = NonNullList.withSize(27, ItemStack.EMPTY);
    private final ContainerOpenersCounter openersCounter = new ContainerOpenersCounter() {
        @Override
        protected void onOpen(Level p_155062_, BlockPos p_155063_, BlockState p_155064_) {
            BarrelBlockEntity.this.playSound(p_155064_, SoundEvents.BARREL_OPEN);
            BarrelBlockEntity.this.updateBlockState(p_155064_, true);
        }

        @Override
        protected void onClose(Level p_155072_, BlockPos p_155073_, BlockState p_155074_) {
            BarrelBlockEntity.this.playSound(p_155074_, SoundEvents.BARREL_CLOSE);
            BarrelBlockEntity.this.updateBlockState(p_155074_, false);
        }

        @Override
        protected void openerCountChanged(Level p_155066_, BlockPos p_155067_, BlockState p_155068_, int p_155069_, int p_155070_) {
        }

        @Override
        protected boolean isOwnContainer(Player p_155060_) {
            if (p_155060_.containerMenu instanceof ChestMenu) {
                Container container = ((ChestMenu)p_155060_.containerMenu).getContainer();
                return container == BarrelBlockEntity.this;
            } else {
                return false;
            }
        }
    };

    public BarrelBlockEntity(BlockPos p_155052_, BlockState p_155053_) {
        super(BlockEntityType.BARREL, p_155052_, p_155053_);
    }

    @Override
    protected void saveAdditional(CompoundTag p_187459_, HolderLookup.Provider p_330809_) {
        super.saveAdditional(p_187459_, p_330809_);
        if (!this.trySaveLootTable(p_187459_)) {
            ContainerHelper.saveAllItems(p_187459_, this.items, p_330809_);
        }
    }

    @Override
    protected void loadAdditional(CompoundTag p_332191_, HolderLookup.Provider p_334663_) {
        super.loadAdditional(p_332191_, p_334663_);
        this.items = NonNullList.withSize(this.getContainerSize(), ItemStack.EMPTY);
        if (!this.tryLoadLootTable(p_332191_)) {
            ContainerHelper.loadAllItems(p_332191_, this.items, p_334663_);
        }
    }

    @Override
    public int getContainerSize() {
        return 27;
    }

    @Override
    protected NonNullList<ItemStack> getItems() {
        return this.items;
    }

    @Override
    protected void setItems(NonNullList<ItemStack> p_58610_) {
        this.items = p_58610_;
    }

    @Override
    protected Component getDefaultName() {
        return Component.translatable("container.barrel");
    }

    @Override
    protected AbstractContainerMenu createMenu(int p_58598_, Inventory p_58599_) {
        return ChestMenu.threeRows(p_58598_, p_58599_, this);
    }

    @Override
    public void startOpen(Player p_58616_) {
        if (!this.remove && !p_58616_.isSpectator()) {
            this.openersCounter.incrementOpeners(p_58616_, this.getLevel(), this.getBlockPos(), this.getBlockState());
        }
    }

    @Override
    public void stopOpen(Player p_58614_) {
        if (!this.remove && !p_58614_.isSpectator()) {
            this.openersCounter.decrementOpeners(p_58614_, this.getLevel(), this.getBlockPos(), this.getBlockState());
        }
    }

    public void recheckOpen() {
        if (!this.remove) {
            this.openersCounter.recheckOpeners(this.getLevel(), this.getBlockPos(), this.getBlockState());
        }
    }

    void updateBlockState(BlockState p_58607_, boolean p_58608_) {
        this.level.setBlock(this.getBlockPos(), p_58607_.setValue(BarrelBlock.OPEN, p_58608_), 3);
    }

    void playSound(BlockState p_58601_, SoundEvent p_58602_) {
        Vec3i vec3i = p_58601_.getValue(BarrelBlock.FACING).getUnitVec3i();
        double d0 = this.worldPosition.getX() + 0.5 + vec3i.getX() / 2.0;
        double d1 = this.worldPosition.getY() + 0.5 + vec3i.getY() / 2.0;
        double d2 = this.worldPosition.getZ() + 0.5 + vec3i.getZ() / 2.0;
        this.level.playSound(null, d0, d1, d2, p_58602_, SoundSource.BLOCKS, 0.5F, this.level.random.nextFloat() * 0.1F + 0.9F);
    }
}