In order to write the normalize() method properly, I realised that we have
to deal with filename prefixes properly. The point being that you can't ..
up into a filename prefix.
Here's the javadoc for the method I'm writing. Does this cover the cases?
/**
* Returns the length of the filename prefix, such as <code>C:/</code>
or <code>~/</code>.
* <p>
* This method will handle a file in either Unix or Windows format.
* The prefix includes the first slash in the full filename.
* <pre>
* Windows:
* a\b\c.txt --> "" --> relative
* \a\b\c.txt --> "\" --> drive relative
* C:\a\b\c.txt --> "C:\" --> absolute
* \\server\a\b\c.txt --> "\\server\" --> UNC
*
* Unix:
* a/b/c.txt --> "" --> relative
* /a/b/c.txt --> "/" --> absolute
* ~/a/b/c.txt --> "~/" --> current user relative
* ~user/a/b/c.txt --> "~user/" --> named user relative
* </pre>
*
* @param filename the filename to find the prefix in, null returns -1
* @return the length of the prefix, -1 if invalid or null
*/
Stephen
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