1 files changed, 41 insertions, 0 deletions
diff --git a/src/main/java/gregtech/api/interfaces/metatileentity/IItemLockable.java b/src/main/java/gregtech/api/interfaces/metatileentity/IItemLockable.java
new file mode 100644
index 0000000000..65bfb416e2
--- /dev/null
+++ b/src/main/java/gregtech/api/interfaces/metatileentity/IItemLockable.java
@@ -0,0 +1,41 @@
+package gregtech.api.interfaces.metatileentity;
+
+import javax.annotation.Nullable;
+
+import net.minecraft.item.ItemStack;
+
+/**
+ * Implement this interface if your MetaTileEntity supports item locking.
+ */
+public interface IItemLockable {
+
+    /**
+     * Set the locked item.
+     * <p>
+     * Implementers should make a copy of this item, as it can be either a physical item or a ghost item dragged from
+     * NEI.
+     *
+     * @param itemStack An item stack to lock
+     * @see com.gtnewhorizons.modularui.api.forge.ItemHandlerHelper#copyStackWithSize(ItemStack, int)
+     */
+    void setLockedItem(@Nullable ItemStack itemStack);
+
+    /**
+     * Get the locked item.
+     *
+     * @return an ItemStack of the locked item. Returns null if there is no locked item.
+     */
+    @Nullable
+    ItemStack getLockedItem();
+
+    /**
+     * Clears the lock on the machine.
+     */
+    void clearLock();
+
+    boolean isLocked();
+
+    default boolean acceptsItemLock() {
+        return false;
+    }
+}