package com.barrelpreserver; import net.fabricmc.api.ModInitializer; import net.fabricmc.fabric.api.event.player.PlayerBlockBreakEvents; import net.minecraft.block.entity.BarrelBlockEntity; import net.minecraft.component.DataComponentTypes; import net.minecraft.component.type.ItemContainerContents; import net.minecraft.entity.EntityType; import net.minecraft.entity.ItemEntity; import net.minecraft.item.ItemStack; import net.minecraft.item.Items; import net.minecraft.server.world.ServerWorld; import net.minecraft.util.collection.DefaultedList; import net.minecraft.util.math.BlockPos; import net.minecraft.util.math.Box; import java.util.ArrayList; import java.util.HashMap; import java.util.List; import java.util.Map; public class BarrelPreserver implements ModInitializer { private static final Map> PENDING_BARRELS = new HashMap<>(); @Override public void onInitialize() { PlayerBlockBreakEvents.BEFORE.register((world, player, pos, state, blockEntity) -> { if (!(blockEntity instanceof BarrelBlockEntity barrel)) return true; List saved = new ArrayList<>(barrel.size()); boolean hasItems = false; for (int i = 0; i < barrel.size(); i++) { ItemStack stack = barrel.getStack(i); saved.add(stack.isEmpty() ? ItemStack.EMPTY : stack.copy()); if (!stack.isEmpty()) hasItems = true; } if (!hasItems) return true; PENDING_BARRELS.put(pos.asLong(), saved); barrel.clear(); return true; }); PlayerBlockBreakEvents.AFTER.register((world, player, pos, state, blockEntity) -> { if (!(world instanceof ServerWorld serverWorld)) return; List saved = PENDING_BARRELS.remove(pos.asLong()); if (saved == null) return; DefaultedList stacks = DefaultedList.ofSize(27, ItemStack.EMPTY); for (int i = 0; i < Math.min(saved.size(), 27); i++) { stacks.set(i, saved.get(i)); } ItemContainerContents contents = ItemContainerContents.copyOf(stacks); Box searchBox = new Box(BlockPos.ofFloored(pos.getX(), pos.getY(), pos.getZ())).expand(2.0); List barrelEntities = serverWorld.getEntitiesByType( EntityType.ITEM, searchBox, e -> e.getStack().isOf(Items.BARREL) ); if (!barrelEntities.isEmpty()) { ItemEntity target = barrelEntities.get(0); ItemStack newStack = target.getStack().copy(); newStack.set(DataComponentTypes.CONTAINER, contents); target.setStack(newStack); for (int i = 1; i < barrelEntities.size(); i++) { barrelEntities.get(i).discard(); } } else { ItemStack barrelStack = new ItemStack(Items.BARREL); barrelStack.set(DataComponentTypes.CONTAINER, contents); double x = pos.getX() + 0.5; double y = pos.getY() + 0.5; double z = pos.getZ() + 0.5; serverWorld.spawnEntity(new ItemEntity(serverWorld, x, y, z, barrelStack)); } }); } }