Do some cleanup.

src/main/java/com/raoulvdberge/refinedstorage/api/util/IStackList.java

@@ -21,9 +21,7 @@ public interface IStackList<T> {
      *
      * @param stack the stack
      */
-    default void add(@Nonnull T stack) {
+    void add(@Nonnull T stack);
-        add(stack, getSizeFromStack(stack));
-    }
 
     /**
      * Decrements the count of that stack in the list.
@@ -40,9 +38,7 @@ public interface IStackList<T> {
      * @param stack the stack
      * @return true if the remove was successful for the full amount, false otherwise
      */
-    default boolean remove(@Nonnull T stack) {
+    boolean remove(@Nonnull T stack);
-        return remove(stack, getSizeFromStack(stack));
-    }
 
     /**
      * Returns a stack.
@@ -84,12 +80,6 @@ public interface IStackList<T> {
      */
     boolean isEmpty();
 
-    /**
-     * @param stack the stack
-     * @return the size of the stack
-     */
-    int getSizeFromStack(T stack);
-
     /**
      * @return a collection of stacks in this list
      */

src/main/java/com/raoulvdberge/refinedstorage/apiimpl/network/node/diskmanipulator/NetworkNodeDiskManipulator.java

@@ -232,7 +232,7 @@ public class NetworkNodeDiskManipulator extends NetworkNode implements IComparab
         ItemStack extracted = null;
         int i = 0;
 
-        if (IFilterable.isEmpty(itemFilters)) {
+        if (itemFilters.isEmpty()) {
             ItemStack toExtract = null;
             ArrayList<ItemStack> networkItems = new ArrayList<>(network.getItemStorageCache().getList().getStacks());
 
@@ -331,7 +331,7 @@ public class NetworkNodeDiskManipulator extends NetworkNode implements IComparab
         FluidStack extracted = null;
         int i = 0;
 
-        if (IFilterable.isEmpty(itemFilters)) {
+        if (fluidFilters.isEmpty()) {
             FluidStack toExtract = null;
             ArrayList<FluidStack> networkFluids = new ArrayList<>(network.getFluidStorageCache().getList().getStacks());
 

src/main/java/com/raoulvdberge/refinedstorage/apiimpl/util/OneSixMigrationHelper.java

@@ -10,6 +10,7 @@ import com.raoulvdberge.refinedstorage.apiimpl.network.node.storage.NetworkNodeF
 import com.raoulvdberge.refinedstorage.apiimpl.network.node.storage.NetworkNodeStorage;
 import com.raoulvdberge.refinedstorage.block.enums.FluidStorageType;
 import com.raoulvdberge.refinedstorage.block.enums.ItemStorageType;
+import com.raoulvdberge.refinedstorage.inventory.item.ItemHandlerBase;
 import com.raoulvdberge.refinedstorage.item.ItemPattern;
 import com.raoulvdberge.refinedstorage.tile.config.IFilterable;
 import net.minecraft.item.Item;
@@ -205,10 +206,10 @@ public class OneSixMigrationHelper implements IOneSixMigrationHelper {
     public static void removalHook() {
     }
 
-    public static void migrateEmptyWhitelistToEmptyBlacklist(String version, IFilterable filterable, @Nullable IItemHandler itemFilterInv) {
+    public static void migrateEmptyWhitelistToEmptyBlacklist(String version, IFilterable filterable, @Nullable ItemHandlerBase itemFilterInv) {
         // Only migrate if we come from a version where the RS version tag stuff in NetworkNode wasn't added yet.
         // Otherwise, we would constantly migrate empty whitelists to empty blacklists...
-        if (version == null && filterable.getMode() == IFilterable.WHITELIST && IFilterable.isEmpty(itemFilterInv)) {
+        if (version == null && filterable.getMode() == IFilterable.WHITELIST && (itemFilterInv == null || itemFilterInv.isEmpty())) {
             filterable.setMode(IFilter.MODE_BLACKLIST);
         }
     }

src/main/java/com/raoulvdberge/refinedstorage/apiimpl/util/StackListFluid.java

@@ -36,6 +36,11 @@ public class StackListFluid implements IStackList<FluidStack> {
         stacks.put(stack.getFluid(), newStack);
     }
 
+    @Override
+    public void add(@Nonnull FluidStack stack) {
+        add(stack, stack.amount);
+    }
+
     @Override
     public boolean remove(@Nonnull FluidStack stack, int size) {
         for (FluidStack otherStack : stacks.get(stack.getFluid())) {
@@ -55,6 +60,11 @@ public class StackListFluid implements IStackList<FluidStack> {
         return false;
     }
 
+    @Override
+    public boolean remove(@Nonnull FluidStack stack) {
+        return remove(stack, stack.amount);
+    }
+
     @Override
     @Nullable
     public FluidStack get(@Nonnull FluidStack stack, int flags) {
@@ -89,11 +99,6 @@ public class StackListFluid implements IStackList<FluidStack> {
         return stacks.isEmpty();
     }
 
-    @Override
-    public int getSizeFromStack(FluidStack stack) {
-        return stack.amount;
-    }
-
     @Nonnull
     @Override
     public Collection<FluidStack> getStacks() {

src/main/java/com/raoulvdberge/refinedstorage/apiimpl/util/StackListItem.java

@@ -35,6 +35,11 @@ public class StackListItem implements IStackList<ItemStack> {
         stacks.put(stack.getItem(), ItemHandlerHelper.copyStackWithSize(stack, size));
     }
 
+    @Override
+    public void add(@Nonnull ItemStack stack) {
+        add(stack, stack.getCount());
+    }
+
     @Override
     public boolean remove(@Nonnull ItemStack stack, int size) {
         for (ItemStack otherStack : stacks.get(stack.getItem())) {
@@ -54,6 +59,11 @@ public class StackListItem implements IStackList<ItemStack> {
         return false;
     }
 
+    @Override
+    public boolean remove(@Nonnull ItemStack stack) {
+        return remove(stack, stack.getCount());
+    }
+
     @Override
     @Nullable
     public ItemStack get(@Nonnull ItemStack stack, int flags) {
@@ -88,11 +98,6 @@ public class StackListItem implements IStackList<ItemStack> {
         return stacks.isEmpty();
     }
 
-    @Override
-    public int getSizeFromStack(ItemStack stack) {
-        return stack.getCount();
-    }
-
     @Nonnull
     @Override
     public Collection<ItemStack> getStacks() {

src/main/java/com/raoulvdberge/refinedstorage/inventory/fluid/FluidInventory.java

@@ -11,6 +11,7 @@ public class FluidInventory {
 
     private FluidStack[] fluids;
     private int maxAmount;
+    private boolean empty = true;
 
     @Nullable
     private Consumer<Integer> listener;
@@ -56,6 +57,8 @@ public class FluidInventory {
         if (listener != null) {
             listener.accept(slot);
         }
+
+        updateEmptyState();
     }
 
     public NBTTagCompound writeToNbt() {
@@ -80,5 +83,23 @@ public class FluidInventory {
                 fluids[i] = FluidStack.loadFluidStackFromNBT(tag.getCompoundTag(key));
             }
         }
+
+        updateEmptyState();
+    }
+
+    private void updateEmptyState() {
+        this.empty = true;
+
+        for (FluidStack fluid : fluids) {
+            if (fluid != null) {
+                this.empty = false;
+
+                return;
+            }
+        }
+    }
+
+    public boolean isEmpty() {
+        return empty;
     }
 }

src/main/java/com/raoulvdberge/refinedstorage/inventory/item/ItemHandlerBase.java

@@ -1,6 +1,7 @@
 package com.raoulvdberge.refinedstorage.inventory.item;
 
 import net.minecraft.item.ItemStack;
+import net.minecraft.nbt.NBTTagCompound;
 import net.minecraftforge.items.ItemStackHandler;
 
 import javax.annotation.Nonnull;
@@ -27,15 +28,6 @@ public class ItemHandlerBase extends ItemStackHandler {
         this(size, null, validators);
     }
 
-    @Override
-    public void setStackInSlot(int slot, @Nonnull ItemStack stack) {
-        validateSlotIndex(slot);
-
-        stacks.set(slot, stack);
-
-        onContentsChanged(slot);
-    }
-
     @Override
     @Nonnull
     public ItemStack insertItem(int slot, @Nonnull ItemStack stack, boolean simulate) {
@@ -63,6 +55,13 @@ public class ItemHandlerBase extends ItemStackHandler {
         this.empty = stacks.stream().allMatch(ItemStack::isEmpty);
     }
 
+    @Override
+    public void deserializeNBT(NBTTagCompound tag) {
+        super.deserializeNBT(tag);
+
+        this.empty = stacks.stream().allMatch(ItemStack::isEmpty);
+    }
+
     public boolean isEmpty() {
         return empty;
     }

src/main/java/com/raoulvdberge/refinedstorage/tile/TileBase.java

@@ -1,6 +1,8 @@
 package com.raoulvdberge.refinedstorage.tile;
 
 import com.raoulvdberge.refinedstorage.tile.data.TileDataManager;
+import com.raoulvdberge.refinedstorage.tile.direction.DirectionHandlerTile;
+import com.raoulvdberge.refinedstorage.tile.direction.IDirectionHandler;
 import com.raoulvdberge.refinedstorage.util.WorldUtils;
 import net.minecraft.block.state.IBlockState;
 import net.minecraft.nbt.NBTTagCompound;

src/main/java/com/raoulvdberge/refinedstorage/tile/TileNode.java

@@ -11,6 +11,7 @@ import com.raoulvdberge.refinedstorage.capability.CapabilityNetworkNodeProxy;
 import com.raoulvdberge.refinedstorage.tile.config.IRedstoneConfigurable;
 import com.raoulvdberge.refinedstorage.tile.config.RedstoneMode;
 import com.raoulvdberge.refinedstorage.tile.data.TileDataParameter;
+import com.raoulvdberge.refinedstorage.tile.direction.DirectionHandlerNetworkNode;
 import net.minecraft.nbt.NBTTagCompound;
 import net.minecraft.util.EnumFacing;
 import net.minecraft.util.math.BlockPos;

src/main/java/com/raoulvdberge/refinedstorage/tile/config/IFilterable.java

@@ -10,8 +10,6 @@ import net.minecraft.tileentity.TileEntity;
 import net.minecraftforge.fluids.FluidStack;
 import net.minecraftforge.items.IItemHandler;
 
-import javax.annotation.Nullable;
-
 public interface IFilterable {
     int WHITELIST = 0;
     int BLACKLIST = 1;
@@ -76,20 +74,6 @@ public interface IFilterable {
         return false;
     }
 
-    static boolean isEmpty(@Nullable IItemHandler filter) {
-        if (filter == null) {
-            return true;
-        }
-
-        for (int i = 0; i < filter.getSlots(); i++) {
-            if (!filter.getStackInSlot(i).isEmpty()) {
-                return false;
-            }
-        }
-
-        return true;
-    }
-
     void setMode(int mode);
 
     int getMode();

src/main/java/com/raoulvdberge/refinedstorage/tile/direction/DirectionHandlerNetworkNode.java

@@ -1,5 +1,6 @@
-package com.raoulvdberge.refinedstorage.tile;
+package com.raoulvdberge.refinedstorage.tile.direction;
 
+import com.raoulvdberge.refinedstorage.tile.TileNode;
 import net.minecraft.nbt.NBTTagCompound;
 import net.minecraft.util.EnumFacing;
 

src/main/java/com/raoulvdberge/refinedstorage/tile/direction/DirectionHandlerTile.java

@@ -1,4 +1,4 @@
-package com.raoulvdberge.refinedstorage.tile;
+package com.raoulvdberge.refinedstorage.tile.direction;
 
 import net.minecraft.nbt.NBTTagCompound;
 import net.minecraft.util.EnumFacing;

src/main/java/com/raoulvdberge/refinedstorage/tile/direction/IDirectionHandler.java

@@ -1,4 +1,4 @@
-package com.raoulvdberge.refinedstorage.tile;
+package com.raoulvdberge.refinedstorage.tile.direction;
 
 import net.minecraft.nbt.NBTTagCompound;
 import net.minecraft.util.EnumFacing;