code: public List<Painter> getPaintersForObject(Paintable paintable) {
  		String className = paintable.getClass().getName();
  		if (painters.containsKey(className)) {
  			return painters.get(className);
  		}
  		return null;
  	}
docs: Retrieve the full list of painter for a specific type of paintable object.
  
  @param paintable
  The type of object to retrieve painter for.
  @return Return a list of painter, or null.