docs: private final boolean collision(Map<Object, InvalidationEvent> hashtable, Enumeration enumeration, long timeStamp) {
  		while (enumeration.hasMoreElements()) {
  			Object key = enumeration.nextElement();	
  			InvalidationEvent invalidationEvent = (InvalidationEvent) hashtable.get(key);	
  			if ((invalidationEvent != null) && (invalidationEvent.getTimeStamp() > timeStamp)) {
  				return true;
  			}
  		}
  		return false;
  	}