1 files changed, 35 insertions, 0 deletions
diff --git a/src/main/java/me/shedaniel/rei/api/IItemRegisterer.java b/src/main/java/me/shedaniel/rei/api/IItemRegisterer.java
new file mode 100644
index 000000000..f397b15c0
--- /dev/null
+++ b/src/main/java/me/shedaniel/rei/api/IItemRegisterer.java
@@ -0,0 +1,35 @@
+package me.shedaniel.rei.api;
+
+import net.minecraft.item.Item;
+import net.minecraft.item.ItemStack;
+
+import java.util.List;
+
+public interface IItemRegisterer {
+    
+    public List<ItemStack> getItemList();
+    
+    @Deprecated
+    public List<ItemStack> getModifiableItemList();
+    
+    public ItemStack[] getAllStacksFromItem(Item item);
+    
+    public void registerItemStack(Item afterItem, ItemStack stack);
+    
+    default public void registerItemStack(Item afterItem, ItemStack... stacks) {
+        for(ItemStack stack : stacks)
+            if (stack != null && !stack.isEmpty())
+                registerItemStack(afterItem, stack);
+    }
+    
+    default public void registerItemStack(ItemStack... stacks) {
+        for(ItemStack stack : stacks)
+            if (stack != null && !stack.isEmpty())
+                registerItemStack(null, stack);
+    }
+    
+    default boolean alreadyContain(ItemStack stack) {
+        return getItemList().stream().anyMatch(stack1 -> ItemStack.areItemStacksEqual(stack, stack1));
+    }
+    
+}