> > so i'm willing to submit my code for review, and (maybe) replacement.
> > what do i do ? post it right here ?
>
> That would be great. If you just want to send the relevent method(s) then that
> would be great. Alternatively you could send a unified patch (-u option) and
> someone can apply that. Sending a patch is the preferred method and is simple
> as
>
> cvs diff -u FileUtil.java >> patchfile.txt
ok, so here's a file with the method. it's not a patch though.
also, it's been designed with unix & windows in mind.
i don't know the specificities of other file systems.
/**
* normalize a path.
* that means : changes to unix style if under windows, removes occurences of "./"
and process "../" when necessary.
* <br><br>
* if path is absolute (starts with '/') and there are too many occurences of
"../" (would then have some kind
* of 'negative' path) returns null.<br>
* if path is relative, the exceeding ../ are kept at the begining of the
path.<br><br>
* please note that this method has been tested with unix and windows only.
*
*
* @param path the path to be normalized.
*
* @return the normalized path or null.
* @throws NullPointerException if path is null.
*/
public static final String normalize (String path)
{
if (path.length () < 2)
return path;
StringBuffer buff = new StringBuffer (path);
int length = path.length ();
// this whole prefix thing is for windows compatibility only.
String prefix = null;
if (length > 2 && buff.charAt (1)==':')
{
prefix = path.substring (0,2);
buff.delete (0,2);
path = path.substring (2);
length -= 2;
}
boolean startsWithSlash = length > 0 && (buff.charAt (0) == '/' || buff.charAt
(0) == '\\');
boolean expStart = true;
int ptCount = 0;
int lastPoint = -1;
int lastSlash = length+1;
int upLevel = 0;
for (int i=length-1;i>=0;i--)
switch (path.charAt (i))
{
case '\\':
buff.setCharAt (i,'/');
case '/':
if (lastSlash == i+1)
buff.deleteCharAt (i);
switch (ptCount)
{
case 1:
buff.delete (i,lastSlash);
break;
case 2:
upLevel ++;
break;
default:
if (upLevel > 0 && lastSlash != i+1)
{
buff.delete (i,lastSlash+3);
upLevel --;
}
break;
}
ptCount = 0;
expStart = true;
lastSlash = i;
break;
case '.':
if (expStart)
ptCount ++;
lastPoint = i;
break;
default:
ptCount = 0;
expStart = false;
break;
}
switch (ptCount)
{
case 1:
buff.delete (0,lastSlash);
break;
case 2:
break;
default:
if (upLevel > 0)
{
if (startsWithSlash)
return null;
else
upLevel = 1;
}
while (upLevel > 0)
{
buff.delete (0,lastSlash+3);
upLevel --;
}
break;
}
length = buff.length ();
boolean isLengthNull = length == 0;
char firstChar = isLengthNull?0:buff.charAt (0);
if (!startsWithSlash && !isLengthNull && firstChar == '/')
buff.deleteCharAt (0);
else if (startsWithSlash && (isLengthNull || (!isLengthNull && firstChar !=
'/')))
buff.insert (0,'/');
if (prefix != null)
buff.insert (0,prefix);
return buff.toString ();
}
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