Unsafe casting to AbstractFileObject subclasses in doRename()
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                 Key: VFS-258
                 URL: https://issues.apache.org/jira/browse/VFS-258
             Project: Commons VFS
          Issue Type: Bug
    Affects Versions: 2.0
            Reporter: Marek Zawirski


AbstractFileObject#doRename() method is called from AbstractFileObject#moveTo() 
when file can be moved within the same file system. As it concerns file that is 
subclass AbstractFileObject, target file is also assumed to be 
AbstractFileObject type. However, this target file can be decorated. Undressing 
with FileObjectUtils.getAbstractFileObject() was not performed in every places 
that it should be. Some subclasses do correct stripping of decorator in 
doRename() implementations (e.g. FtpFileObject), some of them not (e.g. 
RamFileObject) - which may cause ClassCastExceptions.

Patch proposal: pass undressed AbstractFileObject to doRename() instead of 
possibly decorated FileObject.

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