Hopper question for 1.11.2

[Viesis]

I am wondering if there is an easy way to have a hopper only be able to extract items out of a particular inventory slot of a custom tile entity? I have something similar to a furnace, and I would like the hopper to only extract finished products (stack in slot 1) and to insert fuel as needed (stack in slot 0).  I just do not know where to start on this, or if it is something that can be done without messing with hopper logic.  I am using the capabilities for my tile entity inventory but again, just not sure how to approach this as hoppers currently take out all fuel first, then finished products.  Any help would be greatly appreciated.  Thanks!

[Draco18s]

Eg https://github.com/Draco18s/ReasonableRealism/blob/master/src/main/java/com/draco18s/hardlib/api/internal/inventory/OutputItemStackHandler.java

 

That class is set up to only allow extraction, not insertion, but the methodology is the same. I recommend this because it us a wrapper around another handler that CAN have things inserted into it (eg by the machine's own logic) but which isn't exposed directly. 

[Viesis]

I greatly appreciate the help!  This should be a pretty easy fix.  Thanks!