Been a while

src/main/java/io/github/thebusybiscuit/slimefun4/implementation/SlimefunPlugin.java

@@ -98,6 +98,7 @@ import io.github.thebusybiscuit.slimefun4.implementation.listeners.crafting.Cart
 import io.github.thebusybiscuit.slimefun4.implementation.listeners.crafting.CauldronListener;
 import io.github.thebusybiscuit.slimefun4.implementation.listeners.crafting.CraftingTableListener;
 import io.github.thebusybiscuit.slimefun4.implementation.listeners.crafting.GrindstoneListener;
+import io.github.thebusybiscuit.slimefun4.implementation.listeners.crafting.HopperListener;
 import io.github.thebusybiscuit.slimefun4.implementation.resources.GEOResourcesSetup;
 import io.github.thebusybiscuit.slimefun4.implementation.setup.PostSetup;
 import io.github.thebusybiscuit.slimefun4.implementation.setup.ResearchSetup;
@@ -475,6 +476,7 @@ public final class SlimefunPlugin extends JavaPlugin implements SlimefunAddon {
         new CauldronListener(this);
         new GrindstoneListener(this);
         new CartographyTableListener(this);
+        new HopperListener(this);
 
         if (minecraftVersion.isAtLeast(MinecraftVersion.MINECRAFT_1_15)) {
             new BeeListener(this);

src/main/java/io/github/thebusybiscuit/slimefun4/implementation/items/electric/machines/AutoBrewer.java

@@ -5,6 +5,7 @@ import java.util.Map;
 
 import javax.annotation.Nonnull;
 
+import me.mrCookieSlime.Slimefun.Objects.SlimefunItem.abstractItems.VanillaContainer;
 import org.bukkit.Material;
 import org.bukkit.inventory.ItemStack;
 import org.bukkit.inventory.meta.PotionMeta;
@@ -26,7 +27,7 @@ import me.mrCookieSlime.Slimefun.api.inventory.BlockMenu;
  * @author Linox
  *
  */
-public class AutoBrewer extends AContainer {
+public class AutoBrewer extends VanillaContainer {
 
     private static final Map<Material, PotionType> potionRecipes = new EnumMap<>(Material.class);
     private static final Map<PotionType, PotionType> fermentations = new EnumMap<>(PotionType.class);

src/main/java/io/github/thebusybiscuit/slimefun4/implementation/items/electric/machines/AutoDrier.java

@@ -3,6 +3,7 @@ package io.github.thebusybiscuit.slimefun4.implementation.items.electric.machine
 import java.util.ArrayList;
 import java.util.List;
 
+import me.mrCookieSlime.Slimefun.Objects.SlimefunItem.abstractItems.VanillaContainer;
 import org.bukkit.Material;
 import org.bukkit.Tag;
 import org.bukkit.inventory.ItemStack;
@@ -22,7 +23,7 @@ import me.mrCookieSlime.Slimefun.api.SlimefunItemStack;
  * @author Linox
  *
  */
-public class AutoDrier extends AContainer implements RecipeDisplayItem {
+public class AutoDrier extends VanillaContainer implements RecipeDisplayItem {
 
     private List<ItemStack> recipeList;
 

src/main/java/io/github/thebusybiscuit/slimefun4/implementation/items/electric/machines/ElectricFurnace.java

@@ -1,5 +1,6 @@
 package io.github.thebusybiscuit.slimefun4.implementation.items.electric.machines;
 
+import me.mrCookieSlime.Slimefun.Objects.SlimefunItem.abstractItems.VanillaContainer;
 import org.bukkit.Material;
 import org.bukkit.inventory.FurnaceRecipe;
 import org.bukkit.inventory.ItemStack;
@@ -12,7 +13,7 @@ import me.mrCookieSlime.Slimefun.Objects.Category;
 import me.mrCookieSlime.Slimefun.Objects.SlimefunItem.abstractItems.AContainer;
 import me.mrCookieSlime.Slimefun.api.SlimefunItemStack;
 
-public class ElectricFurnace extends AContainer {
+public class ElectricFurnace extends VanillaContainer {
 
     public ElectricFurnace(Category category, SlimefunItemStack item, RecipeType recipeType, ItemStack[] recipe) {
         super(category, item, recipeType, recipe);

src/main/java/io/github/thebusybiscuit/slimefun4/implementation/items/electric/machines/ElectricIngotPulverizer.java

@@ -3,6 +3,7 @@ package io.github.thebusybiscuit.slimefun4.implementation.items.electric.machine
 import java.util.ArrayList;
 import java.util.List;
 
+import me.mrCookieSlime.Slimefun.Objects.SlimefunItem.abstractItems.VanillaContainer;
 import org.bukkit.Material;
 import org.bukkit.inventory.ItemStack;
 
@@ -23,7 +24,7 @@ import me.mrCookieSlime.Slimefun.api.SlimefunItemStack;
  * @see ElectricIngotFactory
  *
  */
-public class ElectricIngotPulverizer extends AContainer implements RecipeDisplayItem {
+public class ElectricIngotPulverizer extends VanillaContainer implements RecipeDisplayItem {
 
     public ElectricIngotPulverizer(Category category, SlimefunItemStack item, RecipeType recipeType, ItemStack[] recipe) {
         super(category, item, recipeType, recipe);

src/main/java/io/github/thebusybiscuit/slimefun4/implementation/items/electric/machines/ElectricOreGrinder.java

@@ -1,5 +1,6 @@
 package io.github.thebusybiscuit.slimefun4.implementation.items.electric.machines;
 
+import me.mrCookieSlime.Slimefun.Objects.SlimefunItem.abstractItems.VanillaContainer;
 import org.bukkit.Material;
 import org.bukkit.inventory.ItemStack;
 
@@ -9,7 +10,7 @@ import me.mrCookieSlime.Slimefun.Objects.Category;
 import me.mrCookieSlime.Slimefun.Objects.SlimefunItem.abstractItems.AContainer;
 import me.mrCookieSlime.Slimefun.api.SlimefunItemStack;
 
-public class ElectricOreGrinder extends AContainer implements RecipeDisplayItem {
+public class ElectricOreGrinder extends VanillaContainer implements RecipeDisplayItem {
 
     public ElectricOreGrinder(Category category, SlimefunItemStack item, RecipeType recipeType, ItemStack[] recipe) {
         super(category, item, recipeType, recipe);

src/main/java/io/github/thebusybiscuit/slimefun4/implementation/items/electric/machines/ElectricSmeltery.java

@@ -5,6 +5,7 @@ import java.util.Comparator;
 import java.util.LinkedList;
 import java.util.List;
 
+import me.mrCookieSlime.Slimefun.Objects.SlimefunItem.abstractItems.VanillaContainer;
 import org.bukkit.Material;
 import org.bukkit.block.Block;
 import org.bukkit.entity.Player;
@@ -35,7 +36,7 @@ import me.mrCookieSlime.Slimefun.api.item_transport.ItemTransportFlow;
  * @author TheBusyBiscuit
  *
  */
-public class ElectricSmeltery extends AContainer {
+public class ElectricSmeltery extends VanillaContainer {
 
     private static final int[] border = { 4, 5, 6, 7, 8, 13, 31, 40, 41, 42, 43, 44 };
     private static final int[] inputBorder = { 0, 1, 2, 3, 9, 12, 18, 21, 27, 30, 36, 37, 38, 39 };

src/main/java/io/github/thebusybiscuit/slimefun4/implementation/listeners/crafting/HopperListener.java

@@ -0,0 +1,36 @@
+package io.github.thebusybiscuit.slimefun4.implementation.listeners.crafting;
+
+import javax.annotation.Nonnull;
+
+import org.bukkit.Location;
+import org.bukkit.event.EventHandler;
+import org.bukkit.event.Listener;
+import org.bukkit.event.inventory.InventoryMoveItemEvent;
+import org.bukkit.event.inventory.InventoryType;
+
+import io.github.thebusybiscuit.slimefun4.implementation.SlimefunPlugin;
+import me.mrCookieSlime.Slimefun.Objects.SlimefunItem.abstractItems.VanillaContainer;
+import me.mrCookieSlime.Slimefun.api.BlockStorage;
+
+/**
+ * This {@link Listener} prevents item from being transferred to a
+ * {@link VanillaContainer} using a hopper.
+ *
+ */
+
+public class HopperListener implements SlimefunCraftingListener {
+
+    public HopperListener(@Nonnull SlimefunPlugin plugin) {
+        plugin.getServer().getPluginManager().registerEvents(this, plugin);
+    }
+
+    @EventHandler
+    public void fromHopper(InventoryMoveItemEvent e) {
+        Location loc = e.getDestination().getLocation();
+        if (e.getSource().getType() == InventoryType.HOPPER && loc != null && BlockStorage.hasBlockInfo(loc)) {
+            if (BlockStorage.check(loc.getBlock()) instanceof VanillaContainer) {
+                e.setCancelled(true);
+            }
+        }
+    }
+}

src/main/java/me/mrCookieSlime/Slimefun/Objects/SlimefunItem/abstractItems/VanillaContainer.java

@@ -0,0 +1,17 @@
+package me.mrCookieSlime.Slimefun.Objects.SlimefunItem.abstractItems;
+
+import javax.annotation.ParametersAreNonnullByDefault;
+
+import org.bukkit.inventory.ItemStack;
+
+import me.mrCookieSlime.Slimefun.Lists.RecipeType;
+import me.mrCookieSlime.Slimefun.Objects.Category;
+import me.mrCookieSlime.Slimefun.api.SlimefunItemStack;
+
+public abstract class VanillaContainer extends AContainer {
+
+    @ParametersAreNonnullByDefault
+    public VanillaContainer(Category category, SlimefunItemStack item, RecipeType recipeType, ItemStack[] recipe) {
+        super(category, item, recipeType, recipe);
+    }
+}