I'm currently looking for way to control what specific items can go into specific slots in an inventory. I need a way to do this for vanilla IInventory's, as well as, potentially, any other mods. More precisely, I'm looking to intercept, work around, or directly "hijack" the method at runtime:
public boolean isItemValidForSlot(int slotNumber, ItemStack itemStack)
belonging to a TileEntity object implementing the IInventory interface.
To elaborate, I need any object that implements IInventory (Vanilla or modded) reject any type of item being placed in any slot of that inventory unless it is the specific item I want to allow. The problem I am running into is how do you make this happen with any existing Objects implementing IInventory. I have a pretty good idea of how I might be able to control what goes in inventory slots when the player is placing items using a GUIContainer. Doing so when automation occurs seems to be quite a bit more tricky.
My idea so far:
Place ItemStack of item I want to allow in slot of size 1. Decrement 1 from ItemStack size just before or just after slot accepts more items of same type and before next update tick (unsure how to implement this). Some how insure there wasn't overflow.
The thing is, I'm not sure how to detect when an inventory slot has changed, other than mapping references to all IInventory TileEntities in the affected loaded chunks and exhaustively comparing their contents to a previous state. This seems excessive and too computationally expensive for something so simple and that could potentially happen frequently.
I've already devised a way to store information associated with TileEntities implementing IInventory in a chunk's NBT. I suppose all I need is a way to monitory which TileEntities are changing.
Has anyone done something like this before in another mod that I could use as an example? It has to be compatible with any TileEntity implementing IInventory.