Checking if players inventory is full?

I found a bug in my FoundDiamond plugin. If a players inventory is full it will not give them anything. Is there a way that I can make it so if there inventory is full but they have 60 of one material and if they were rewarded 10, then 4 would go into that stack and the 6 others would drop at their feet?

 

firstEmpty() to find is there is an empty slot (I don't know what it returns, 0 or null).
first(Material material) or first(int MaterialId), then getItem(int index) to get the diamond ItemStack, (maybe you'll need to call contains(...) before).
Check its amount.
Should work, I guess.
http://jd.bukkit.org/doxygen/d3/dad/interfaceorg_1_1bukkit_1_1inventory_1_1Inventory.html

 

firstEmpy() returns -1 if the inventory is full.

 

Does this include stacks that aren't max stack quantity or just that all slots are filled with something?

 

Actually I found something that works.

Code:

HashMap<Integer, ItemStack> leftOver = new HashMap<Integer, ItemStack>();
                    leftOver.putAll((playerP.getInventory().addItem(new ItemStack(item.getMaterial(), amount))));
                    if (!leftOver.isEmpty()) {
                        Location loc = playerP.getLocation();
                        playerP.getWorld().dropItem(loc, new ItemStack(Material.getMaterial(leftOver.get(0).getTypeId()), leftOver.get(0).getAmount()));
                    }

addItem() will return the leftover items.

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

 

Slots left, but what @kensclark15 posted is probably what you are more looking for.