Paper/src/main/java/net/minecraft/server/ItemBed.java

package net.minecraft.server;

// CraftBukkit start
import org.bukkit.block.BlockState;
import org.bukkit.craftbukkit.block.CraftBlockState;
import org.bukkit.craftbukkit.event.CraftEventFactory;
import org.bukkit.event.block.BlockPlaceEvent;
// CraftBukkit end

public class ItemBed extends Item {

    public ItemBed(int i) {
        super(i);
    }

    public boolean a(ItemStack itemstack, EntityHuman entityhuman, World world, int i, int j, int k, int l) {
        if (l != 1) {
            return false;
        } else {
            int clickedX = i, clickedY = j, clickedZ = k; // CraftBukkit;

            ++j;
            BlockBed blockbed = (BlockBed) Block.BED;
            int i1 = MathHelper.b((double) (entityhuman.yaw * 4.0F / 360.0F) + 0.5D) & 3;
            byte b0 = 0;
            byte b1 = 0;

            if (i1 == 0) {
                b1 = 1;
            }

            if (i1 == 1) {
                b0 = -1;
            }

            if (i1 == 2) {
                b1 = -1;
            }

            if (i1 == 3) {
                b0 = 1;
            }

            if (world.isEmpty(i, j, k) && world.isEmpty(i + b0, j, k + b1) && world.d(i, j - 1, k) && world.d(i + b0, j - 1, k + b1)) {
                BlockState blockState = CraftBlockState.getBlockState(world, i, j, k); // CraftBukkit

                world.b(i, j, k, blockbed.id, i1);

                // CraftBukkit start - bed
                BlockPlaceEvent event = CraftEventFactory.callBlockPlaceEvent(world, entityhuman, blockState, clickedX, clickedY, clickedZ,  blockbed);

                if (event.isCancelled() || !event.canBuild()) {
                    event.getBlockPlaced().setTypeIdAndData(blockState.getTypeId(), blockState.getRawData(), false);
                    return false;
                }
                // CraftBukkit end

                world.b(i + b0, j, k + b1, blockbed.id, i1 + 8);
                --itemstack.count;
                return true;
            } else {
                return false;
            }
        }
    }
}