From f639532225e3c7c9cafca03acc05a739ff4144bc Mon Sep 17 00:00:00 2001
From: asiekierka <kontakt@asie.pl>
Date: Sun, 26 Apr 2015 13:56:53 +0200
Subject: [PATCH] add FML remap event support to mapping registry, should help
 backwards compatibility

---
 .../api/blueprints/MappingRegistry.java       | 66 ++++++++++++++++++-
 1 file changed, 63 insertions(+), 3 deletions(-)

diff --git a/api/buildcraft/api/blueprints/MappingRegistry.java b/api/buildcraft/api/blueprints/MappingRegistry.java
index c9f11f5f..6ecca2fd 100755
--- a/api/buildcraft/api/blueprints/MappingRegistry.java
+++ b/api/buildcraft/api/blueprints/MappingRegistry.java
@@ -8,10 +8,21 @@
  */
 package buildcraft.api.blueprints;
 
+import java.lang.reflect.Field;
 import java.util.ArrayList;
+import java.util.Collection;
 import java.util.HashMap;
 import java.util.HashSet;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
 
+import com.google.common.collect.ArrayListMultimap;
+import com.google.common.collect.ListMultimap;
+import com.google.common.collect.Multimap;
+import com.google.common.collect.MultimapBuilder;
+import com.google.common.collect.Multiset;
+import com.google.common.eventbus.EventBus;
 import org.apache.logging.log4j.Level;
 
 import net.minecraft.block.Block;
@@ -22,6 +33,11 @@ import net.minecraft.nbt.NBTTagCompound;
 import net.minecraft.nbt.NBTTagList;
 import net.minecraft.nbt.NBTTagShort;
 
+import cpw.mods.fml.common.FMLCommonHandler;
+import cpw.mods.fml.common.FMLModContainer;
+import cpw.mods.fml.common.Loader;
+import cpw.mods.fml.common.ModContainer;
+import cpw.mods.fml.common.event.FMLMissingMappingsEvent;
 import net.minecraftforge.common.util.Constants;
 
 import buildcraft.api.core.BCLog;
@@ -290,6 +306,36 @@ public class MappingRegistry {
 		}
 	}
 
+	private final Object getMissingMappingFromFML(boolean isBlock, String name, int i) {
+		String modName = name.split(":")[0];
+		if (Loader.isModLoaded(modName)) {
+			try {
+				FMLMissingMappingsEvent.MissingMapping mapping = new FMLMissingMappingsEvent.MissingMapping(
+						(isBlock ? '\u0001' : '\u0020') + name, i
+				);
+				ListMultimap<String, FMLMissingMappingsEvent.MissingMapping> missingMapping
+						= ArrayListMultimap.create();
+				missingMapping.put(modName, mapping);
+				FMLMissingMappingsEvent event = new FMLMissingMappingsEvent(missingMapping);
+				for (ModContainer container : Loader.instance().getModList()) {
+					if (container instanceof FMLModContainer) {
+						event.applyModContainer(container);
+						((FMLModContainer) container).handleModStateEvent(event);
+						if (mapping.getAction() != FMLMissingMappingsEvent.Action.DEFAULT) {
+							break;
+						}
+					}
+				}
+				if (mapping.getAction() == FMLMissingMappingsEvent.Action.REMAP) {
+					return mapping.getTarget();
+				}
+			} catch (Exception e) {
+				e.printStackTrace();
+			}
+		}
+		return null;
+	}
+
 	public void read (NBTTagCompound nbt) {
 		NBTTagList blocksMapping = nbt.getTagList("blocksMapping",
 				Constants.NBT.TAG_COMPOUND);
@@ -304,8 +350,15 @@ public class MappingRegistry {
 			}
 			String name = sub.getString("name");
 			Block b = null;
+
+			if (!Block.blockRegistry.containsKey(name) && name.contains(":")) {
+				b = (Block) getMissingMappingFromFML(true, name, i);
+				if (b != null) {
+					BCLog.logger.info("Remapped " + name + " to " + Block.blockRegistry.getNameForObject(b));
+				}
+			}
 			
-			if (Block.blockRegistry.containsKey(name)) {
+			if (b == null && Block.blockRegistry.containsKey(name)) {
 				b = (Block) Block.blockRegistry.getObject(name);
 			}
 			
@@ -332,8 +385,15 @@ public class MappingRegistry {
 
 			String name = sub.getString("name");
 			Item item = null;
-			
-			if (Item.itemRegistry.containsKey(name)) {
+
+			if (!Item.itemRegistry.containsKey(name) && name.contains(":")) {
+				item = (Item) getMissingMappingFromFML(false, name, i);
+				if (item != null) {
+					BCLog.logger.info("Remapped " + name + " to " + Item.itemRegistry.getNameForObject(item));
+				}
+			}
+
+			if (item == null && Item.itemRegistry.containsKey(name)) {
 				item = (Item) Item.itemRegistry.getObject(name);
 			}