Package TWiki::AccessControlException 
Exception used raise an access control violation. This exception has the
following fields: 
-  
web - the web which was being accessed
  -  
topic - the topic being accessed (if any)
  -  
user - canonical username of the person doing the accessing. Use   the methods of the TWiki::Users class to get more information about the   user.
  -  
mode - the access mode e.g. CHANGE, VIEW etc
  -  
reason a text string giving the reason for the refusal.
 
 
The exception may be thrown by plugins. If a plugin throws the exception, it
will normally be caught and the browser redirected to a login screen (if the
user is not logged in) or reported (if they are and just don't have access).
 ClassMethod new ($mode,$user,$web,$topic,$reason) 
 
-  
$mode - mode of access (view, change etc)
  -  
$user - canonical user name of user doing the accessing
  -  
$web - web being accessed
  -  
$topic - topic being accessed
  -  
$reason - string reason for failure
 
 
All the above fields are accessible from the object in a catch clause
in the usual way e.g. 
$e->{web} and 
$e->{reason}
Generate a summary string. This is mainly for debugging.