[vfs]: FileSystemManage.createFileSystem(FileObject)

[Paul Smith <Pa...@lawlex.com.au>]

Hi Ho,

I just have a simple question.  It appears that there is a method:

FileObject FileSystemManage.createFileSystem(FileObject)

Do I interpret this code that if I had a FileObject that was a remote Zip
file, that the returned FileObject would represent a 'directory' of the Zip
contents?

If this is the case I am hoping to add to Chainsaw v2's VFS plugin an
ability to 'mount' a new repository using a particular zip/jar etc.  In
Chainsaw terms this would display the zip/jar as a new repository icon in
the tree, and allow you to "browse" the contents of the zip like you would a
directory.

Is that the case?  <cross-fingers>true</cross-fingers>

If this is the case, is there some way through the
FileObject/FileSystemManager interfaces whether a particular FileObject is
able to be translated into a virtual FileObject?  Given any arbitary
FileObject, how can my code know whether this object could be mounted as a
virtualy file system root.

cheers,

Paul Smith

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Re: [vfs]: FileSystemManage.createFileSystem(FileObject)

[Mario Ivankovits <im...@apache.org>]

Paul Smith wrote:

> <>FileObject FileSystemManage.createFileSystem(FileObject)
> Do I interpret this code that if I had a FileObject that was a remote Zip
> file, that the returned FileObject would represent a 'directory' of 
> the Zip
> contents?

yes

> <>Is that the case? <cross-fingers>true</cross-fingers>

yesyes.

> <>If this is the case, is there some way through the
> FileObject/FileSystemManager interfaces whether a particular FileObject is
> able to be translated into a virtual FileObject? Given any arbitary
> FileObject, how can my code know whether this object could be mounted as a
> virtualy file system root.

            if (manager.canCreateFileSystem(file))
            {
                // Use contents of the file
                file = manager.createFileSystem(file);
            }

If the manager returns true on canCreateFileSystem depends on the 
"mime-type-map" entries in providers.xml.

first the java internal methods to determine the mimetype (by filename) 
is used and a lookup on mime-type-map is done:

    <mime-type-map mimetype="application/zip" scheme="zip"/>

if this fails, vfs tries to find an entry using the extension in the 
extension-map

    <extension-map extension="jar" scheme="jar"/>

if a scheme is found this file "canCreate-A-FileSystem".

There is a todo from the old authors to implement this more 
transparently - i will pick this up as one of the next vfs things i will do.
Maybe a new hasChildren() and then a simple getChildren() might do the job.
However, for now the above if/create should make it too.

-- Mario


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