With the old IInventory, you could specify which slots would be accessed from what side.

How can I do the same with ItemHandlers? I want to make an input slot (0) that allows the player to remove the item, but not pipes (or only from below), so that the process

of the machine doesn't get interrupted by the pipe pulling out the ingredients.

In short: I want the pipes to be able to only access the output slots (1 and 2).

 

I currently have this code:

package tschipp.pathology.tileentity.handler;

import net.minecraft.item.ItemStack;
import net.minecraft.nbt.NBTTagCompound;
import net.minecraft.nbt.NBTTagList;
import net.minecraftforge.common.util.Constants;
import net.minecraftforge.items.ItemStackHandler;
import tschipp.pathology.item.PAItems;

public class ItemHandlerMicroscope extends ItemStackHandler {

	public ItemHandlerMicroscope() {
		super(3);
		this.setSize(3);
	}


	@Override
	public void deserializeNBT(NBTTagCompound nbt)
	{
		setSize(3);
		NBTTagList tagList = nbt.getTagList("Items", Constants.NBT.TAG_COMPOUND);
		for (int i = 0; i < tagList.tagCount(); i++)
		{
			NBTTagCompound itemTags = tagList.getCompoundTagAt(i);
			int slot = itemTags.getInteger("Slot");

			if (slot >= 0 && slot < stacks.size())
			{
				stacks.set(slot, new ItemStack(itemTags));
			}
		}
		onLoad();
	}


	@Override
	public ItemStack insertItem(int slot, ItemStack stack, boolean simulate) {

		if(slot == 0 && !stack.isEmpty() && (stack.getItem() == PAItems.bloodSyringe) || (stack.getItem() == PAItems.virusSyringe && !stack.hasTagCompound() || !stack.getTagCompound().hasKey("researched") || !stack.getTagCompound().getBoolean("researched")))
			return super.insertItem(slot, stack, simulate);
		else return stack;
	}


	public void insertSyringe(int slot, ItemStack stack)
	{
		ItemStack slotStack = this.getStackInSlot(slot);
		int count = slotStack.getCount();
		if(count == 0)
			this.setStackInSlot(slot, stack);
		else
		{
			slotStack.setCount(count + 1);
		}

	}

}

 

Any help is very much appreciated

Yeah, does that mean I need a different handler for the input slot?

 Oh well. Is there a place where I can submit a feature request for forge?

Likely whatever feature your about to ask for is already possible. You can combine ItemHandlers already, so you'd just spilt them up and combine them as needed. 

https://github.com/Draco18s/ReasonableRealism/blob/master/src/main/java/com/draco18s/farming/entities/TileEntityTanner.java#L143