Solved How to detect if block is inside entity (EnderCrystel)

I want to block players ftom putting blocks inside EnderCrystals using pistons.
I have this code:

Code:

@EventHandler
public void onExtend(BlockPistonExtendEvent e){
    if(!e.getBlocks().isEmpty()){
        Block b = e.getBlocks().get(e.getBlocks().size() - 1).getRelative(e.getDirection());
        // if block is inside ender crystall then event is canceld
    }
}

 

@dumbasPL
I think you can just check if the block type is equal to Material.END_CRYSTAL

 

EnderCrystal is entity not a block.

Code:

Bukkit.getServer().broadcastMessage(b.getType().name());

gives: AIR if i try to do it

 

@dumbasPL
Ok, so this is the best way I could find to do it.

Code:

for (Entity e : b.getLocation.getChunk().getEntities()) {
    if (e.getType().equals(EntityType.ENDER_CRYSTAL) {

        if (e.getLocation().equals(b.getLocation()) {
            //Theres the entity
        }
    }
}

 

Ender crystal is 2x2x2 block entity, your code works only if it is pefectly aligned and on only one of 8 posible locations
I come up witch witch tihs:

Code:

@EventHandler
    public void onExtend(BlockPistonExtendEvent e){
        if(!e.getBlocks().isEmpty()){
            Block b = e.getBlocks().get(e.getBlocks().size() - 1).getRelative(e.getDirection());
            for (Entity ee : b.getLocation().getChunk().getEntities()) {
                if (ee.getType().equals(EntityType.ENDER_CRYSTAL)) {
                    Block el = ee.getLocation().getBlock();
                    Block bl = b.getLocation().getBlock();
                    boolean cancel = false;
                    if (bl.getRelative(0, 0, 0).equals(el)) cancel = true;
                    if (bl.getRelative(1, 0, 0).equals(el)) cancel = true;
                    if (bl.getRelative(0, 0, 1).equals(el)) cancel = true;
                    if (bl.getRelative(1, 0, 1).equals(el)) cancel = true;
                    if (bl.getRelative(0, -1, 0).equals(el)) cancel = true;
                    if (bl.getRelative(1, -1, 0).equals(el)) cancel = true;
                    if (bl.getRelative(0, -1, 1).equals(el)) cancel = true;
                    if (bl.getRelative(1, -1, 1).equals(el)) cancel = true;
                    if (bl.getRelative(-1, 0, 0).equals(el)) cancel = true;
                    if (bl.getRelative(0, 0, -1).equals(el)) cancel = true;
                    if (bl.getRelative(-1, 0, -1).equals(el)) cancel = true;
                    if (bl.getRelative(0, -1, 0).equals(el)) cancel = true;
                    if (bl.getRelative(-1, -1, 0).equals(el)) cancel = true;
                    if (bl.getRelative(0, -1, -1).equals(el)) cancel = true;
                    if (bl.getRelative(-1, -1, -1).equals(el)) cancel = true;
                    if(cancel) e.setCancelled(true);
                }
            }
        }
    }

It has two false positeves around one corner but i will work for me.
thx for help. Marking as solved.