[1.18.1] How to make ItemStackHandler/Container set an itemStack in a slot without being able to extract the itemStack?

[NindyBun]

So I am trying to make an itemstack act like a filter by cloning an itemstack into said slot and returns an empty itemstack when I get the stack in said slot. But I can't seem to get it to work properly as it doesn't set an itemstack in a slot.

My Handler: https://github.com/NindyBun/BurnerGun_1.18.1/blob/master/src/main/java/com/nindybun/burnergun/common/items/upgrades/Trash/TrashHandler.java
My Container: https://github.com/NindyBun/BurnerGun_1.18.1/blob/master/src/main/java/com/nindybun/burnergun/common/containers/TrashContainer.java

Edited March 17, 2022 by NindyBun

[NindyBun]

Quote

Sorry, but I do not understand the desired behavior. What use is it to put a stack into the slot, if it's never gonna get returned and getStackInSlot just always reports empty?

Please explain the gameplay behavior you want, not how you want to program it.

So basically, I want to make an item that acts as a filter. As in I only want it to accept the itemstack I put in and clears itself if I click on that slot again because I am using this as a whitelist/blacklist container to essentially "filter" out block drops.

[Draco18s]

Here's a 1.14 example that works like described.

https://github.com/Draco18s/ReasonableRealism/blob/1.14.4/src/main/java/com/draco18s/industry/inventory/SlotIInventory.java