TnT Explosions Block Damage

How would I customize the amount of TnT it'll take to damage Obsidian?

I.E - It'll take 5 tnt to blow up Obsidian

I'm sure theres a plugin but I would like to know how to do this for reference

Thanks a lot bukkit community!

 

@Eggspurt
You would need to create a map that stores Blocks,Integers. When obsidian is within that area when it explodes, you add the block instance with a number (starting with 0 and incrementing every time: (Integer Instance)+1) Once that number is high enough (lets say 5), then you would remove the block from the map and use Block#breaknaturally();

 

I'm not asking to be spoonfed, but I am not the best with maps. Do you think you could make like a quick example of how to do the mapping?

 

Code:

HashMap<Key,Value> method = new HashMap<Key,Value>();
method.put("Key1","Value1");
method.get("Key1");
//ect.