[VFS] questions

[Christoph Spielmann <sp...@gmail.com>]

HI everybody!

I have been playing around with VFS for a few days now because i have to
do a presentation about the jakarta commons projects on Friday in a
open-source software class i'm attending.

The prof said that we should concentrate on actual programming examples
so i tried to create a simple VFS-Program but i don't seem to be able to...

If i understood the sense of a VFS correctly i *should* be able to do
this with commons VFS:

1. I create a FileSystemManager-Object:

    this.defFSManager=new DefaultFileSystemManager();
    this.defFSManager.addProvider("file", new DefaultLocalFileProvider());
    this.defFSManager.addProvider("zip", new ZipFileProvider());
    this.defFSManager.addProvider("tar", new TarFileProvider());
    this.defFSManager.addProvider("http",new HttpFileProvider());
    this.defFSManager.init();
   
    (i tried it with this.defFSManager=VFS.getManager(); too but that
didn't change a thing...)

2. I create a VirtualFileSystem-Object:

   
this.virtFS=(VirtualFileSystem)this.defFSManager.createVirtualFileSystem("vfs://").getFileSystem();

3. I add a junction ("mount" a filesystem (a zip-file) if i understood
it correctly in terms of commons-vfs):

    File zipFile = new File("/mnt/downloads/gimp-2.2.8-i586-setup.zip");
    FileObject zipFileObject = this.defFSManager.toFileObject(zipFile);
   
this.virtFS.addJunction("/"+zipFile.getName(),this.defFSManager.resolveFile("zip:"+
zipFileObject+"!/"));

So far everything works as expected and i should have the following
Virtual File System (again if i am correct maybe i completely
misunderstood VFS):

vfs://
+--gimp-2.2.8-i586-setup.zip/

But now i'm out of ideas:

I wanted to write a method that accepts a FileObject as Parameter,
prints out the Filename) and then gets the children of the
FileObject-Parameter (if it has any) and calls the method again
recursively (so i would like to traverse my vfs-tree) but no matter what
i do i can't get the children of the root of my virtual filesystem. I
always get the following Exception:
org.apache.commons.vfs.FileSystemException: Could not list the contents
of folder "vfs:///". But that has to be possible somehow???!?

I would appreciate any idea how to get the children of the vfs-root!

Regards,

Christoph





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Re: [VFS] questions

[Mario Ivankovits <ma...@ops.co.at>]

Hi Christoph!

> I
> always get the following Exception:
> org.apache.commons.vfs.FileSystemException: Could not list the contents
> of folder "vfs:///". But that has to be possible somehow???!?
>   
It looks like the "virtual file system" part of VFS isnt widely used and
the test coverage in this area need some "enhancements ;-) ".

If fixed some problems with it now and now your use case show work (again).

I tested it with the following code:
        FileObject foVfs =
VFS.getManager().createVirtualFileSystem("vfs://");
        VirtualFileSystem fsVfs = (VirtualFileSystem) foVfs.getFileSystem();
        FileObject foTar =
VFS.getManager().resolveFile("tar:file:/home/im/tmp/log4j.tar!/");
        fsVfs.addJunction("mytar", foTar);
        list(foVfs);


Please try the next nightly or svn head.

Thanks!
Ciao,
Mario


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