Util Unload, Delete & Copy Worlds

Here's something you can use for unloading, deleting and copying worlds in a simple manor.

Unloading a world (open) Unloading a world (close)

Add this to the end of your class:

Code:java

 
public void unloadWorld(World world) {
    this.world = Bukkit.getWorld("");
    if(!world.equals(null)) {
        Bukkit.getServer().unloadWorld(world, true);
    }
}
 

At the top of your class, add this variable:

Code:java

 
private World world;
 

Now define the world to unload with: (and replace <your world name>)

Code:java

 
World unload = Bukkit.getWorld("<your world name>");
 

Now simply use:

Code:java

 
unloadWorld(unload);
 

Deleting a world (open) Deleting a world (close)

Add this to the end of your class:

Code:

public boolean deleteWorld(File path) {
      if(path.exists()) {
          File files[] = path.listFiles();
          for(int i=0; i<files.length; i++) {
              if(files[i].isDirectory()) {
                  deleteWorld(files[i]);
              } else {
                  files[i].delete();
              }
          }
      }
      return(path.delete());
}

Now define the world to delete with the variable "delete"

Code:java

 
World delete = Bukkit.getWorld("somerandomworld");
File deleteFolder = delete.getWorldFolder();
 

Now simply use:

Code:java

 
deleteWorld(deleteFolder);
 

Copying a world (open) Copying a world (close)

Add this to the end of your class:

Code:java

 
public void copyWorld(File source, File target){
    try {
        ArrayList<String> ignore = new ArrayList<String>(Arrays.asList("uid.dat", "session.dat"));
        if(!ignore.contains(source.getName())) {
            if(source.isDirectory()) {
                if(!target.exists())
                target.mkdirs();
                String files[] = source.list();
                for (String file : files) {
                    File srcFile = new File(source, file);
                    File destFile = new File(target, file);
                    copyWorld(srcFile, destFile);
                }
            } else {
                InputStream in = new FileInputStream(source);
                OutputStream out = new FileOutputStream(target);
                byte[] buffer = new byte[1024];
                int length;
                while ((length = in.read(buffer)) > 0)
                    out.write(buffer, 0, length);
                in.close();
                out.close();
            }
        }
    } catch (IOException e) {
 
    }
}
 

Now define the source world and the target world

Code:java

 
// The world to copy
World source = Bukkit.getWorld("world");
File sourceFolder = source.getWorldFolder();
 
// The world to overwrite when copying
World target = Bukkit.getWorld("NewWorld");
File targetFolder = target.getWorldFolder();
 

Now simply use:

Code:java

 
copyWorld(sourceFolder, targetFolder);
 

Hope it helps!

 

Does this delete the whole world? Including the spawn chucks? and everything?

 

Ty Cleere
This will delete the whole world file.

ThunderWaffeMC
This is pretty cool! I'll be sure to use it in my ServerControl plugin!

 

Looks nice, I remember trying to help you on a subject similar to this XD

 

Yeah I got it all working, Gamecube762 and since I couldn't find anything like it, I worked it out and posted it here! But I thank you very much for the help!

MrSparkzz That's great to hear!

 

This looks great, however it's "manner" not "manor".

 

Oops. Well, I'm not going to change it otherwise the syntax will go wrong. Thanks anyway.

 

copy-paste it first.

 

Do you have to import java.oi or org.bukkit?

 

Sorry for late reply; it's org.bukkit and anything todo with files is java imports.

 

How would you load a world?

 

Ultimate_n00b See this.

 

So would a practical use for this be a spleef map for a mini game? For instance, you are in the spleef arena, you destroy it, game is over players teleported out of map, then map is deleted, and a new copy is put in place from a backup/original source.

Does this sound about right?

 

thats kinda what I use it for. Not for spleef but same idea

 

There is a much more easy way to copy a world:

Code:java

WorldCreator w = new WorldCreator("new_world");
w.copy(Bukkit.getWorld("world"));
w.createWorld();

This will copy the world "world" and then load it.

EDIT:
I just tested it with a flat world and thought it copies the world but it just copies the generator settings of the world... Sorry ^^

 

The copy function does not work for me... i get a lot of errors in the console

Code:java

World source = Bukkit.getWorld("world");
File sourceFolder = source.getWorldFolder();
 
// The world to overwrite when copying
World target = Bukkit.getWorld("NewWorld");
File targetFolder = target.getWorldFolder();
@Override
    public void onEnable() {
        try{
            System.out.println("[FishBattle] saving the world...");
            copyWorld(sourceFolder, targetFolder);
        } catch(Exception e){
 
        }
 
    }
 
    @Override
    public void onDisable() {
        try{
            copyWorld(targetFolder, sourceFolder);
        } catch(Exception e){
 
        }
    }

where is my fault?

 

GPSforLEGENDS and what are those errors?

 

ok i found the error... but i still have a problem: at onEnable it take a copy and save it but onDisable he does not copy the world back... but if i take the file from the "newWorld" and put them in world it do a copy

Code:

[19:24:30 ERROR]: Encountered an unexpected exception
net.minecraft.server.v1_7_R3.ExceptionWorldConflict: The save is being accessed
from another location, aborting
        at net.minecraft.server.v1_7_R3.WorldNBTStorage.checkSession(WorldNBTSto
rage.java:72) ~[craftbukkit.jar:git-Bukkit-1.7.9-R0.1-10-g8688bd4-b3092jnks]
        at net.minecraft.server.v1_7_R3.World.G(World.java:2634) ~[craftbukkit.j
ar:git-Bukkit-1.7.9-R0.1-10-g8688bd4-b3092jnks]
        at net.minecraft.server.v1_7_R3.WorldServer.a(WorldServer.java:790) ~[cr
aftbukkit.jar:git-Bukkit-1.7.9-R0.1-10-g8688bd4-b3092jnks]
        at net.minecraft.server.v1_7_R3.WorldServer.save(WorldServer.java:763) ~
[craftbukkit.jar:git-Bukkit-1.7.9-R0.1-10-g8688bd4-b3092jnks]
        at net.minecraft.server.v1_7_R3.MinecraftServer.saveChunks(MinecraftServ
er.java:369) ~[craftbukkit.jar:git-Bukkit-1.7.9-R0.1-10-g8688bd4-b3092jnks]
        at net.minecraft.server.v1_7_R3.MinecraftServer.u(MinecraftServer.java:5
76) ~[craftbukkit.jar:git-Bukkit-1.7.9-R0.1-10-g8688bd4-b3092jnks]
        at net.minecraft.server.v1_7_R3.MinecraftServer.run(MinecraftServer.java
:469) [craftbukkit.jar:git-Bukkit-1.7.9-R0.1-10-g8688bd4-b3092jnks]
        at net.minecraft.server.v1_7_R3.ThreadServerApplication.run(SourceFile:6
28) [craftbukkit.jar:git-Bukkit-1.7.9-R0.1-10-g8688bd4-b3092jnks]
[19:24:30 ERROR]: This crash report has been saved to: C:\Users\Rob1998\Desktop\
Alles\Plugins\TestServer 1.7.2\.\crash-reports\crash-2014-08-07_19.24.30-server.
txt
>

EDIT by Moderator: merged posts, please use the edit button instead of double posting.

 

GPSforLEGENDS this problem is because when minecraft (the internal server) checks the session of the map, it notifies that the session is wrong. I usually avoid that by deleting the session file and creating a new one:

Code:java

File session = new File(Bukkit.getWorldContainer(), name + "/session.lock");
        session.delete();
        try {
            session.createNewFile();
            DataOutputStream dataoutputstream = new DataOutputStream(new FileOutputStream(session));
 
            try {
                dataoutputstream.writeLong(System.currentTimeMillis());
            } finally {
                dataoutputstream.close();
            }
        } catch (IOException ioexception) {

 

Nice! If I hadn't made my own (my one is more (arguably less) certain it'll work since I use Reflection to force unload the world as Bukkit.unloadWorld() sometimes doesn't work properly or doesn't unload instantly) I'd have used this.
Though...

Code:

if(!world.equals(null)) {

Wouldn't that itself just throw a NullPointerException since you're calling ".equals" on a possibly null object. You should do: if (world != null).

 

Where do I place this in the copyWorld() method? Thanks in advance.

 

InfamousSheep I don't know your copy method but you should do this after the word is copied

 

@Qwerty89983nr2
How to i replace a exiting world with the copy world?

 

@ThunderWaffeMC
This does not seem to be working for me. Can you provide some code on how to use it.

 

Thanks! I'ma use it to unload worlds when people aren't on to optimise RAM usage!

 

I get a null pointer exception for

Code:

    World source = Bukkit.getWorld("world");

    File sourceFolder = source.getWorldFolder();

    // The world to overwrite when copying

    World target = Bukkit.getWorld("NewWorld");

    File targetFolder = target.getWorldFolder();

can you help me?

 

@teeter11 which line do you get the npe for? Do you have "world" and "NewWorld" loaded?

 

Because NewWorld probably doesn't exist or is not loaded yet. To get the folder of target, you should do:
File targetFolder = new File(Bukkit.getWorldContainer(), "NewWorld");

 

static World delete = Bukkit.getWorld("WORLD");
static File deleteFolder = delete.getWorldFolder();

This returns nullpointerexception

 

@Slendy_man19 You can't initialize 'delete' before Bukkit is initialized. Move the initialization to the onEnable method.