Solved Getting doublechest instance

I need to get a doublechest instance. I've tried casting from chest to doublechest, but it didn't work. How can I get the double chest instance from a chest blockstate?
Either this, or I need the 2 locations of the double chest. I would want to refrain from looping all the surrounding blocks.

 

What exaclty are you trying to do?

 

@henderry2019 I need to check if there's a wall sign on the chest

nevermind, figured it out

EDIT by Moderator: merged posts, please use the edit button instead of double posting.

 

Maybe i help you

nevermind <.<

Code:

@EventHandler
    public void a(BlockPlaceEvent e) {
        Location l = e.getBlockAgainst().getLocation();
        Location l1 = l.add(1, 0, 1);
        Location l2 = l.add(-1, 0, -1);
        if (l.getBlock().getType() == Material.CHEST) {
            if (l1.getBlock().getType() == Material.CHEST || l2.getBlock().getType() == Material.CHEST) {
                //do stuff
            }
        }
    }