How to distinguish multiple same element already in place on a minecraft map

Question

I am currently working on a minecraft plugin using spigot. It's a sort of a race between players where checkpoints validation is needed.

I have a minecraft map edited on MCEdit and I have severals signs already set on the map that serves as "checkpoints".

All I need is to find a way to distinguish the signs.
I would like to get x y z coordinates of each signs but I've thought that there could be map makers that wouldn't name their signs the same way I do, so I need to find another way to distinguish the signs.

I have a debut code but i don't have any ideas to get it forward.

@EventHandler
public void onClick(PlayerInteractEvent e){

        if(e.getItem().getType() == Material.SIGN){


            //I'll have to getlocation() the signs
            //And maybe store the locations in an array

            e.setCancelled(true);
        }

}

Any ideas?

Answer 1

So I've bypassed the problem just by setting a new checkpoint on clicking on a sign. Here's the code in case it helps someday :

Location checkpoint;    

public void setcheckpoint(int x, int y, int z, Player p) {

    Location checkpoint = new Location(p.getWorld(), x, y, z);
    this.checkpoint = checkpoint;

}

@EventHandler
public void onClick(PlayerInteractEvent e) {
    Player p = e.getPlayer();
    if (e.hasBlock() && e.getAction() == Action.RIGHT_CLICK_BLOCK) {
        if (e.getClickedBlock().getType() == Material.SIGN) {
            setcheckpoint(e.getClickedBlock().getX(),e.getClickedBlock().getY(),e.getClickedBlock().getZ(),p);
        }

    }

}

The checkpoint the player clicked on gets it's coordinates stored into the checkpoint Location, which is much simpler.

Sorry on having taken your time and thanks for the help !