code: public Set<Node> getWrapperSet(Set<?> objects)
  	{
  		Set<Node> wrapped = new HashSet<Node>();
  
  		for (Object object : objects)
  		{
  			Node node = (Node) getGraphObject(object);
  			if (node != null)
  			{
  				wrapped.add(node);
  			}
  		}
  		return wrapped;
  	}
docs: Gets wrappers of given elements
  @param objects Wrapped objects
  @return wrappers