Greetings!

 

I've been working with tile entities for quite some time now, and I had no troubles updating entity data from the server to client, and saving to disk.

However, I've come across something I really can't find the mistake in.

 

@Override
public void writeToNBT(NBTTagCompound tag){
super.writeToNBT(tag);
tag.setInteger("numberOfProcesses",craftingProcesses.size());
System.out.println("write:"+craftingProcesses.size());
if(worldObj!=null){
	System.out.println("world: "+worldObj.isRemote);
}
for(int i=0;i<craftingProcesses.size();i++){
	NBTTagCompound tag2=new NBTTagCompound();
	((ItemStack)craftingProcesses.get(i)[0]).writeToNBT(tag2);
	tag.setTag("process0"+i,tag2);
	tag.setInteger("process1"+i,(Integer)craftingProcesses.get(i)[1]);
	tag.setInteger("process2"+i,(Integer)craftingProcesses.get(i)[2]);
	tag.setInteger("process3"+i,(Integer)craftingProcesses.get(i)[3]);
}
}

@Override
public void readFromNBT(NBTTagCompound tag){
super.readFromNBT(tag);
int numberOfProcesses=tag.getInteger("numberOfProcesses");
System.out.println("read: "+numberOfProcesses);
if(worldObj!=null){
	System.out.println("world: "+worldObj.isRemote);
}
craftingProcesses.clear();
for(int i=0;i<numberOfProcesses;i++){
	craftingProcesses.add(new Object[]{ItemStack.loadItemStackFromNBT(tag.getCompoundTag("process0"+i)),
	tag.getInteger("process1+i"),
	tag.getInteger("process2"+i),
	tag.getInteger("process3"+i)});
}
}

 

 

I have an arraylist of objects to be saved. I put an integer in the tag, saying how many elements there are in the arraylist, and use a for-loop to put them all the objects (ItemStack and 3 integers per element) in the arraylist, nothing I haven't successfully done before.

 

When I read I do the reverse. I get the number, and do a for loop getting an itemstack and 3 integers and put them in an Object array, and add that to the (now cleared) arraylist.

 

I added prints to the writeToNBT and readFromNBT saying howmany elements they're saving. When using the world normally all is fine. If I edit my arraylist i do the following.

 

worldObj.markBlockForUpdate(xCoord,yCoord,zCoord);
markDirty();

 

This might be a bit overkill, but I wanted to be sure.

 

So, as I said, everything is okay, untill i press escape (the game checks for the dirty entities and saves them to disk)

 

I then get the following output...

 

[server thread/INFO]: Saving and pausing game...
[server thread/INFO]: Saving chunks for level 'New World'/Overworld
[server thread/INFO] [sTDOUT]: [net.pancake.singularity.tileentities.TileEntityItemCrafter:writeToNBT:44]: write:1
[server thread/INFO] [sTDOUT]: [net.pancake.singularity.tileentities.TileEntityItemCrafter:writeToNBT:46]: world: false
[server thread/INFO] [sTDOUT]: [net.pancake.singularity.tileentities.TileEntityItemCrafter:writeToNBT:44]: write:0
[server thread/INFO] [sTDOUT]: [net.pancake.singularity.tileentities.TileEntityItemCrafter:writeToNBT:46]: world: false
[server thread/INFO]: Saving chunks for level 'New World'/Nether
[server thread/INFO]: Saving chunks for level 'New World'/The End

 

As you can see, it writes two times, both from the server. But suddenly the size of my arraylist is 0. My writeToNBT method doesn't edit the arraylist in any way. What happened? If I exit the world, and log back in, the arraylist size is 0., instead of the 1 it was.

 

Maybe I just need a pair of fresh eyes... or fresh brains.

 

Thanks in advance,

Pancake.

Maybe your craftingProcesses has been cleared by something else?  Or an extra TileEntity copy has been created with no craftingProcesses?

 

I suggest you add a small bit of code, put a breakpoint on it, and have a look at the tileEntity and craftingProcesses to see what's wrong with them, perhaps also add some other System.out.println() to other places which initialise or otherwise edit craftingProcesses

 

	super.writeToNBT(tag);
tag.setInteger("numberOfProcesses",craftingProcesses.size());
System.out.println("write:"+craftingProcesses.size());
   if (craftingProcesses.size() == 0) {
      int i = 1;  // breakpoint here
   }

 

-TGG

One error I can see is that in readFromNBT you never do anything with the 3 integers, you just request them from the NBT and the immediately discard them.

 

He's not actually.  I thought so too, but they're actually just inside the

new Object[]{...}

chunk.

Oh jesus christ, that's some stupid formatting! Give this forum syntax-highlight!

 

None the less, it's still crappy code.  I always new-line and indent stuff like that unless it's simple crap.

First of all, why are you not using a NBTTagList? It would be much more efficient (and more clear!) than using the "tag<n>" keys in an NBTTagCompound.

One error I can see is that in readFromNBT you never do anything with the 3 integers, you just request them from the NBT and the immediately discard them.

 

Your data structure is also inefficient and confusing at best. The elements in your craftingProcesses list should not be generic Object arrays, make a class that holds the ItemStack and the 3 numbers.

 

I do use those 3 integers, look at the way the brackets are around them. I know, It's hard to miss

And efficiency wasn't the point of this setup, but I suppose putting it in a class would allow me to monitor access more. Thanks for the advice!

 

I've messed around a bit with the debugger, and figured out the tile entity that had arraylist size 0 was another entity, somewhere in my world. So now I'm testing it in a new world.

 

I did some more checking, and discovered a typo. It's also in my original post. instead of asking "process1"+i , I asked "process1+i". Wow, that was one of the hardest errors I ever had to find. Why don't Tags throw exceptions when they can't find a thing associated with the string? -.-' That's just silly!

#endrant

 

Thanks for the help anyways guys.

Oh jesus christ, that's some stupid formatting! Give this forum syntax-highlight!

 

None the less, it's still crappy code.  I always new-line and indent stuff like that unless it's simple crap.

 

I actually had it one line, but decided to make it a bit more readable for you guys.

Yes, I should be ashamed of myself.

I did some more checking, and discovered a typo. It's also in my original post. instead of asking "process1"+i , I asked "process1+i". Wow, that was one of the hardest errors I ever had to find. Why don't Tags throw exceptions when they can't find a thing associated with the string? -.-' That's just silly!

 

Not really.  I make use of the "tag doesn't exist, so it returns 0" functionality all the time.  Mainly because I'm taking that value (0 is a legitimate value) and increment it (or whatever), and shoving it back into the NBT.

 

If you really care, use NBTCompoundTag#hasTag