Fixed interface having weird extraction / insertion rules, fixes #224

src/main/java/refinedstorage/inventory/InterfaceItemHandler.java

@@ -0,0 +1,24 @@
+package refinedstorage.inventory;
+
+import net.minecraft.item.ItemStack;
+import net.minecraftforge.items.ItemStackHandler;
+
+public class InterfaceItemHandler extends ItemStackHandler {
+    private BasicItemHandler importItems;
+    private BasicItemHandler exportItems;
+
+    public InterfaceItemHandler(BasicItemHandler importItems, BasicItemHandler exportItems) {
+        this.importItems = importItems;
+        this.exportItems = exportItems;
+    }
+
+    @Override
+    public ItemStack insertItem(int slot, ItemStack stack, boolean simulate) {
+        return importItems.insertItem(slot, stack, simulate);
+    }
+
+    @Override
+    public ItemStack extractItem(int slot, int amount, boolean simulate) {
+        return exportItems.extractItem(slot, amount, simulate);
+    }
+}

src/main/java/refinedstorage/tile/TileInterface.java

@@ -12,6 +12,7 @@ import net.minecraftforge.items.wrapper.CombinedInvWrapper;
 import refinedstorage.RefinedStorage;
 import refinedstorage.container.ContainerInterface;
 import refinedstorage.inventory.BasicItemHandler;
+import refinedstorage.inventory.InterfaceItemHandler;
 import refinedstorage.inventory.UpgradeItemHandler;
 import refinedstorage.item.ItemUpgrade;
 import refinedstorage.tile.config.ICompareConfig;
@@ -22,6 +23,7 @@ public class TileInterface extends TileNode implements ICompareConfig {
     private BasicItemHandler importItems = new BasicItemHandler(9, this);
     private BasicItemHandler exportSpecimenItems = new BasicItemHandler(9, this);
     private BasicItemHandler exportItems = new BasicItemHandler(9, this);
+    private InterfaceItemHandler itemHandler = new InterfaceItemHandler(importItems, exportItems);
     private UpgradeItemHandler upgrades = new UpgradeItemHandler(4, this, ItemUpgrade.TYPE_SPEED, ItemUpgrade.TYPE_STACK);
 
     private int compare = 0;
@@ -173,11 +175,7 @@ public class TileInterface extends TileNode implements ICompareConfig {
     @Override
     public <T> T getCapability(Capability<T> capability, EnumFacing facing) {
         if (capability == CapabilityItemHandler.ITEM_HANDLER_CAPABILITY) {
-            if (facing == EnumFacing.DOWN) {
-                return (T) exportItems;
-            } else {
-                return (T) importItems;
-            }
+            return (T) itemHandler;
         }
 
         return super.getCapability(capability, facing);