From ec39cec734b36fda00c59e4a19da2387e021c0c7 Mon Sep 17 00:00:00 2001
From: iTitus <iTitus@users.noreply.github.com>
Date: Sun, 8 Nov 2015 21:12:44 +0100
Subject: [PATCH] Fix #3119

---
 common/buildcraft/robotics/EntityRobot.java | 33 +++++++++++++++++++++
 1 file changed, 33 insertions(+)

diff --git a/common/buildcraft/robotics/EntityRobot.java b/common/buildcraft/robotics/EntityRobot.java
index 4906961e15..870265c305 100644
--- a/common/buildcraft/robotics/EntityRobot.java
+++ b/common/buildcraft/robotics/EntityRobot.java
@@ -11,9 +11,11 @@
 import java.util.ArrayList;
 import java.util.Date;
 import java.util.List;
+import java.util.Set;
 import java.util.WeakHashMap;
 
 import com.google.common.collect.Iterables;
+import com.google.common.collect.Sets;
 import com.mojang.authlib.GameProfile;
 import com.mojang.authlib.properties.Property;
 import io.netty.buffer.ByteBuf;
@@ -26,6 +28,7 @@
 import net.minecraft.entity.monster.IMob;
 import net.minecraft.entity.player.EntityPlayer;
 import net.minecraft.inventory.IInventory;
+import net.minecraft.item.Item;
 import net.minecraft.item.ItemArmor;
 import net.minecraft.item.ItemSkull;
 import net.minecraft.item.ItemStack;
@@ -99,6 +102,8 @@ public class EntityRobot extends EntityRobotBase implements
 			DefaultProps.TEXTURE_PATH_ROBOTS + "/robot_base.png");
 	public static final int MAX_WEARABLES = 8;
 
+	private static Set<Integer> blacklistedItemsForUpdate = Sets.newHashSet();
+
 	public LaserData laser = new LaserData();
 	public DockingStation linkedDockingStation;
 	public BlockIndex linkedDockingStationIndex;
@@ -368,6 +373,18 @@ public void onEntityUpdate() {
 			}
 		}
 
+
+		// tick all carried itemstacks
+		for (int i = 0; i < inv.length; i++) {
+			updateItem(inv[i], i, false);
+		}
+
+		// tick the item the robot is currently holding
+		updateItem(itemInUse, 0, true);
+
+		// do not tick wearables or equipment from EntityLiving
+
+
 		super.onEntityUpdate();
 		this.worldObj.theProfiler.endSection();
 	}
@@ -1494,4 +1511,20 @@ public int receiveEnergy(int maxReceive, boolean simulate) {
 	public List<ItemStack> getWearables() {
 		return wearables;
 	}
+
+	private void updateItem(ItemStack stack, int i, boolean held) {
+		if (stack != null && stack.getItem() != null) {
+			int id = Item.getIdFromItem(stack.getItem());
+			// did this item not throw an exception before?
+			if (!blacklistedItemsForUpdate.contains(id)) {
+				try {
+					stack.getItem().onUpdate(stack, worldObj, this, i, held);
+				} catch (Exception e) {
+					// the item threw an exception, print it and do not let it update once more
+					e.printStackTrace();
+					blacklistedItemsForUpdate.add(id);
+				}
+			}
+		}
+	}
 }