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File name from file descriptor

Posted on 2003-10-31
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Last Modified: 2008-03-06
Can I get the file name from  file descriptor using reflection.

Thanks
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Question by:shankii
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9 Comments
 
LVL 16

Expert Comment

by:imladris
ID: 9659842
What do you mean by a "file descriptor" exactly?

Certainly a File object has a method (getName) which returns its name.
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LVL 15

Expert Comment

by:jimmack
ID: 9660951
Do you mean java.io.FileDescriptor?

From the javadoc:

"Applications should not create their own file descriptors."

If you mean, can you get the name of a .class file that contains the code you are examining by reflection, then get the name of the Constructor and add ".class" to it.
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LVL 92

Accepted Solution

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objects earned 250 total points
ID: 9661403
You can't.
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LVL 15

Expert Comment

by:jimmack
ID: 9661463
Hi objects,

   I was trying not to be so blunt with my first point ;-)
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Author Comment

by:shankii
ID: 9661477
Hi
What I meant is :

  FileInputStream fis = new FileInputStream(filename);
  fileDescriptor fd = fis.getFD();

 I want to get the file name from this fd.

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LVL 92

Expert Comment

by:objects
ID: 9661479
I know what you meant :)  The FileDescriptor instance knows nothing about the name of the file
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LVL 15

Expert Comment

by:jimmack
ID: 9661489
Why would you want to do that?  Why not just store filename?
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