How did I not think of this?

src/main/java/de/ellpeck/actuallyadditions/mod/data/WorldData.java

@@ -46,8 +46,17 @@ public class WorldData{
         this.dimension = dimension;
     }
 
-    public static WorldData getDataForWorld(int world){
+    public static WorldData getDataForWorld(World world){
-        return worldData.get(world);
+        int dim = world.provider.getDimension();
+        WorldData data = worldData.get(dim);
+
+        if(data == null && world.isRemote){
+            data = new WorldData(null, dim);
+            worldData.put(dim, data);
+            ModUtil.LOGGER.info("Creating temporary WorldData for world "+dim+" on the client!");
+        }
+
+        return data;
     }
 
     private void readFromNBT(NBTTagCompound compound){
@@ -142,7 +151,7 @@ public class WorldData{
                 }
             }
             else{
-                ModUtil.LOGGER.error("Tried to save WorldData without any data being present!?");
+                ModUtil.LOGGER.error("Tried to save WorldData for "+world.provider.getDimension()+" without any data being present!?");
             }
         }
     }
@@ -150,9 +159,9 @@ public class WorldData{
     public static void unload(World world){
         if(!world.isRemote){
             save(world);
-            int dim = world.provider.getDimension();
+
-            worldData.remove(dim);
+            worldData.remove(world.provider.getDimension());
-            ModUtil.LOGGER.info("Unloading WorldData for world "+dim+"!");
+            ModUtil.LOGGER.info("Unloading WorldData for world "+world.provider.getDimension()+"!");
         }
     }
 }

src/main/java/de/ellpeck/actuallyadditions/mod/event/WorldLoadingEvents.java

@@ -19,24 +19,18 @@ public class WorldLoadingEvents{
 
     @SubscribeEvent
     public void onLoad(WorldEvent.Load event){
-        if(!event.getWorld().isRemote){
         WorldData.load(event.getWorld());
     }
-    }
 
     @SubscribeEvent
     public void onUnload(WorldEvent.Unload event){
-        if(!event.getWorld().isRemote){
         WorldData.unload(event.getWorld());
         FakePlayerUtil.unloadFakePlayer();
     }
-    }
 
     @SubscribeEvent
     public void onSave(WorldEvent.Save event){
-        if(!event.getWorld().isRemote){
         WorldData.save(event.getWorld());
     }
-    }
 
 }

src/main/java/de/ellpeck/actuallyadditions/mod/items/ItemLaserWrench.java

@@ -54,7 +54,7 @@ public class ItemLaserWrench extends ItemBase{
                     BlockPos savedPos = ItemPhantomConnector.getStoredPosition(stack);
                     if(savedPos != null){
                         TileEntity savedTile = world.getTileEntity(savedPos);
-                        if(ItemPhantomConnector.getStoredWorld(stack) == world && savedTile instanceof TileEntityLaserRelay && ((TileEntityLaserRelay)savedTile).isItem == ((TileEntityLaserRelay)tile).isItem && LaserRelayConnectionHandler.addConnection(savedPos, pos, world.provider.getDimension())){
+                        if(ItemPhantomConnector.getStoredWorld(stack) == world && savedTile instanceof TileEntityLaserRelay && ((TileEntityLaserRelay)savedTile).isItem == ((TileEntityLaserRelay)tile).isItem && LaserRelayConnectionHandler.addConnection(savedPos, pos, world)){
                             ItemPhantomConnector.clearStorage(stack);
 
                             ((TileEntityLaserRelay)world.getTileEntity(savedPos)).sendUpdate();

src/main/java/de/ellpeck/actuallyadditions/mod/misc/LaserRelayConnectionHandler.java

@@ -17,6 +17,7 @@ import io.netty.util.internal.ConcurrentSet;
 import net.minecraft.nbt.NBTTagCompound;
 import net.minecraft.nbt.NBTTagList;
 import net.minecraft.util.math.BlockPos;
+import net.minecraft.world.World;
 
 public class LaserRelayConnectionHandler{
 
@@ -42,7 +43,7 @@ public class LaserRelayConnectionHandler{
     /**
      * Gets all Connections for a Relay
      */
-    public static ConcurrentSet<ConnectionPair> getConnectionsFor(BlockPos relay, int world){
+    public static ConcurrentSet<ConnectionPair> getConnectionsFor(BlockPos relay, World world){
         ConcurrentSet<ConnectionPair> allPairs = new ConcurrentSet<ConnectionPair>();
         for(Network aNetwork : WorldData.getDataForWorld(world).laserRelayNetworks){
             for(ConnectionPair pair : aNetwork.connections){
@@ -57,7 +58,7 @@ public class LaserRelayConnectionHandler{
     /**
      * Removes a Relay from its Network
      */
-    public static void removeRelayFromNetwork(BlockPos relay, int world){
+    public static void removeRelayFromNetwork(BlockPos relay, World world){
         Network network = getNetworkFor(relay, world);
         if(network != null){
             //Setup new network (so that splitting a network will cause it to break into two)
@@ -74,7 +75,7 @@ public class LaserRelayConnectionHandler{
     /**
      * Gets a Network for a Relay
      */
-    public static Network getNetworkFor(BlockPos relay, int world){
+    public static Network getNetworkFor(BlockPos relay, World world){
         for(Network aNetwork : WorldData.getDataForWorld(world).laserRelayNetworks){
             for(ConnectionPair pair : aNetwork.connections){
                 if(pair.contains(relay)){
@@ -89,7 +90,7 @@ public class LaserRelayConnectionHandler{
      * Adds a new connection between two relays
      * (Puts it into the correct network!)
      */
-    public static boolean addConnection(BlockPos firstRelay, BlockPos secondRelay, int world){
+    public static boolean addConnection(BlockPos firstRelay, BlockPos secondRelay, World world){
         int distance = (int)PosUtil.toVec(firstRelay).distanceTo(PosUtil.toVec(secondRelay));
         if(distance > TileEntityLaserRelay.MAX_DISTANCE || PosUtil.areSamePos(firstRelay, secondRelay)){
             return false;
@@ -131,7 +132,7 @@ public class LaserRelayConnectionHandler{
      * Merges two laserRelayNetworks together
      * (Actually puts everything from the second network into the first one and removes the second one)
      */
-    public static void mergeNetworks(Network firstNetwork, Network secondNetwork, int world){
+    public static void mergeNetworks(Network firstNetwork, Network secondNetwork, World world){
         for(ConnectionPair secondPair : secondNetwork.connections){
             firstNetwork.connections.add(secondPair);
         }

src/main/java/de/ellpeck/actuallyadditions/mod/tile/TileEntityItemViewer.java

@@ -31,7 +31,7 @@ public class TileEntityItemViewer extends TileEntityInventoryBase{
     private List<GenericItemHandlerInfo> getItemHandlerInfos(){
         TileEntityLaserRelayItem relay = this.getConnectedRelay();
         if(relay != null){
-            LaserRelayConnectionHandler.Network network = LaserRelayConnectionHandler.getNetworkFor(relay.getPos(), this.worldObj.provider.getDimension());
+            LaserRelayConnectionHandler.Network network = LaserRelayConnectionHandler.getNetworkFor(relay.getPos(), this.worldObj);
             if(network != null){
                 return relay.getItemHandlersInNetwork(network);
             }

src/main/java/de/ellpeck/actuallyadditions/mod/tile/TileEntityLaserRelay.java

@@ -37,13 +37,13 @@ public abstract class TileEntityLaserRelay extends TileEntityBase{
 
     @Override
     public void receiveSyncCompound(NBTTagCompound compound){
-        LaserRelayConnectionHandler.removeRelayFromNetwork(this.pos, this.worldObj.provider.getDimension());
+        LaserRelayConnectionHandler.removeRelayFromNetwork(this.pos, this.worldObj);
 
         NBTTagList list = compound.getTagList("Connections", 10);
         if(!list.hasNoTags()){
             for(int i = 0; i < list.tagCount(); i++){
                 LaserRelayConnectionHandler.ConnectionPair pair = LaserRelayConnectionHandler.ConnectionPair.readFromNBT(list.getCompoundTagAt(i));
-                LaserRelayConnectionHandler.addConnection(pair.firstRelay, pair.secondRelay, this.worldObj.provider.getDimension());
+                LaserRelayConnectionHandler.addConnection(pair.firstRelay, pair.secondRelay, this.worldObj);
             }
         }
 
@@ -56,7 +56,7 @@ public abstract class TileEntityLaserRelay extends TileEntityBase{
         NBTTagCompound compound = super.getUpdateTag();
         NBTTagList list = new NBTTagList();
 
-        ConcurrentSet<LaserRelayConnectionHandler.ConnectionPair> connections = LaserRelayConnectionHandler.getConnectionsFor(this.pos, this.worldObj.provider.getDimension());
+        ConcurrentSet<LaserRelayConnectionHandler.ConnectionPair> connections = LaserRelayConnectionHandler.getConnectionsFor(this.pos, this.worldObj);
         if(connections != null && !connections.isEmpty()){
             for(LaserRelayConnectionHandler.ConnectionPair pair : connections){
                 list.appendTag(pair.writeToNBT());
@@ -79,7 +79,7 @@ public abstract class TileEntityLaserRelay extends TileEntityBase{
     public void renderParticles(){
         if(Util.RANDOM.nextInt(ConfigValues.lessParticles ? 16 : 8) == 0){
             BlockPos thisPos = this.pos;
-            LaserRelayConnectionHandler.Network network = LaserRelayConnectionHandler.getNetworkFor(thisPos, this.worldObj.provider.getDimension());
+            LaserRelayConnectionHandler.Network network = LaserRelayConnectionHandler.getNetworkFor(thisPos, this.worldObj);
             if(network != null){
                 for(LaserRelayConnectionHandler.ConnectionPair aPair : network.connections){
                     if(aPair.contains(thisPos) && PosUtil.areSamePos(thisPos, aPair.firstRelay)){
@@ -93,7 +93,7 @@ public abstract class TileEntityLaserRelay extends TileEntityBase{
     @Override
     public void invalidate(){
         super.invalidate();
-        LaserRelayConnectionHandler.removeRelayFromNetwork(this.pos, this.worldObj.provider.getDimension());
+        LaserRelayConnectionHandler.removeRelayFromNetwork(this.pos, this.worldObj);
     }
 
 }

src/main/java/de/ellpeck/actuallyadditions/mod/tile/TileEntityLaserRelayEnergy.java

@@ -46,7 +46,7 @@ public class TileEntityLaserRelayEnergy extends TileEntityLaserRelay implements
     public int transmitEnergy(BlockPos blockFrom, int maxTransmit, boolean simulate){
         int transmitted = 0;
         if(maxTransmit > 0){
-            LaserRelayConnectionHandler.Network network = LaserRelayConnectionHandler.getNetworkFor(this.pos, this.worldObj.provider.getDimension());
+            LaserRelayConnectionHandler.Network network = LaserRelayConnectionHandler.getNetworkFor(this.pos, this.worldObj);
             if(network != null){
                 transmitted = this.transferEnergyToReceiverInNeed(blockFrom, network, Math.min(ConfigIntValues.LASER_RELAY_MAX_TRANSFER.getValue(), maxTransmit), simulate);
             }