[SOLVED]Next problem : protection of [Protection] signs !

Hi !
So, I've made a little plugin to protect chests with signs.
I prevented not allowed players to open a protected chest, to break a protected chest, to break a protection sign, to break a block supporting a protection sign, to create a protection sign attached to a block like sand and gravel, but there is one problem left.
If someone use a piston on the block where the sign is attached, the sign will be broken.
This breaking doesn't call a BlockBreakEvent, right ?
How to handle it ?

 

You could use the BlockPistonExtend event.

 

I think this will be laggy.
I just want to know, when a sign breaks, if the first line was [Protection].
If yes, cancel the event. But when the sign break "alone" I don't know which event I must use.

 

You just loop through all pushed blocks and check if one is protected. If yes, cancel the event.

 

Now, with this I should loop through all pushed blocks, check if they have a sign attached to them, then for each signs see if their first line is [Protection].
I solved my problem, I found that the event was BlockPhysicsEvent.

PHP:

    public void onBlockPhysics(BlockPhysicsEvent event) {
        Material material = event.getBlock().getType();
        if (material.equals(Material.SIGN_POST) || material.equals(Material.WALL_SIGN)) {
            Sign sign = (Sign)event.getBlock().getState();
            if (ChatColor.stripColor(sign.getLine(0)).equalsIgnoreCase("[Privé]")) {
                event.setCancelled(true);
            }
        }
    }

I think it's faster