How do I rename (not move) a file in JDK7?

Question

Hello!

I'm a bit confused with all these new File I/O classes in JDK7.

Let's say, I have a Path and want to rename the file, it represents.
How do I specify the new name, when again a Path is expected?

Path p = /* path to /home/me/file123 */;
Path name = p.getName(); /* gives me file123 */
name.moveTo(/* what now? */); /* how to rename file123 to file456? */

NOTE: Why do I need JDK7? Handling of symbolic links!

Problem is: I have to do it with files, which names and locations are known at runtime. So, what I need, is a safe method (without exceptional side-effects) to create a new name-Path of some old name-Path.

Path newName(Path oldName, String newNameString){
    /* magic */ 
}

Answer 1

If the destination path is identical to the source path except for the name of the file, it will be renamed rather than moved.

So for your example, the moveto path should be

/home/me/file456

Answer 2

If you take a look at Apache Commons IO there's a class called FileNameUtils. This does a ton of stuff wrt. file path names and will (amongst other things) reliably split up path names etc. I think that should get you a long way towards what you want.

Answer 3

OK, after trying everything out, it seems I found the right method:

// my helper method
Path newName(Path oldFile, String newNameString){
    // the magic is done by Path.resolve(...)
    return oldFile.getParent().resolve(newNameString);
}

// so, renaming is done by:
oldPath.moveTo(newName(oldFile, "newName"));

Answer 4

You have a path string and you need to create a Path instance. You can do this with the getPath method or resolve. Here's one way:

    Path dir = oldFile.getParent();        
    Path fn = oldFile.getFileSystem().getPath(newNameString);
    Path target = (dir == null) ? fn : dir.resolve(fn);        
    oldFile.moveTo(target);

Note that it checks if parent is null (looks like your solution don't do that).