code: public boolean isProperlyShutDown() {
  		for (File path : paths) {
  			if (path != null && path.exists()) {
  				return false;
  			}
  		}
  		return true;
  	}
docs: Utility method to check whether the IO manager has been properly shut down.
  For this base implementation, this means that all files have been removed.
  
  @return True, if the IO manager has properly shut down, false otherwise.