I've noticed that the ice:inputFile component will only upload files to the directory $TOMCAT_HOME/webapps/MyAppName/upload/. I want this directory to be dependent on the user initials for the current user (i.e. user with initials abc wants to upload a file, the file goes to $TOMCAT_HOME/webapps/MyAppName/upload/abc/). How can I dynamically set this attribute?