How can I delete a world? (This is not supposed to be a prank)

Hey, I'm currently developing a plugin which would allow you to draw your world
(click here if you want to know some more).
However, to generate biomes (not the world itself), I have set up a world generator which
generates an empty world. This way, there won't be any time wasted on that.
So I want to get the biomes of the world, this is why it creates a temporary one, which
is the only way I've found to generate biomes based on a seed unfortunately.
However, after I'm done working with the world, I'd like to delete it, as it's a temp world...
But that is not possible.
The only way I've tried is

Code:

[World].getWorldFolder().delete();

but that doesn't seem to work...

So how can I do it?
Of course, if you know a way to generate biomes without a temp world, but based on a seed,
that would be cool too =P

Thanks in advance,
Kierrow

EDIT:
I did unload the world before trying to delete it.

 

I do believe your trying to delete files that are being used by a program, and windows (and other OSes) don't like that.

Your best bet is to modify the vanilla world generator to only generate biome data.

 

It's probably what Fishrock said. You'll want to unload the world, then remove it.
getServer().unloadWorld([world]);

 

Yeah I tried that. There has to be another way...

 

You have to delete it recursively. Something like this:

Code:

    private void deleteFolder(File file) {
        if (file.isDirectory()) {
            File[] files = file.listFiles();
            for (File f : files) {
                deleteFolder(f);
            }
        }
        file.delete();
    }

 

I wouldn't worry about it. If a user wants to delete a world, they should do that, not the plugin. Thats likely why there is no "delete world" method implemented.