bookshelf-inspector/remappedSrc/me/lukasabbe/bookshelfinspector/util/LecternTools.java

package me.lukasabbe.bookshelfinspector.util;

import me.lukasabbe.bookshelfinspector.Bookshelfinspector;
import net.minecraft.block.entity.BlockEntityType;
import net.minecraft.block.entity.LecternBlockEntity;
import net.minecraft.entity.player.PlayerEntity;
import net.minecraft.item.ItemStack;
import net.minecraft.util.math.BlockPos;
import net.minecraft.world.World;

import java.util.Optional;

public class LecternTools {
    public static ItemStack getItemStack(BlockPos pos, PlayerEntity player){
        final World world = Bookshelfinspector.serverInstance.getPlayerManager().getPlayer(player.getUuid()).getWorld();

        if(world == null) return null;
        Optional<LecternBlockEntity> blockEntityOptional = world.getBlockEntity(pos, BlockEntityType.LECTERN);
        if(blockEntityOptional.isEmpty()) return null;

        LecternBlockEntity lecternBlock = blockEntityOptional.get();

        return lecternBlock.getBook();
    }
}