public void update() throws ModelException
	{
		TradeKingForeman foreman = new TradeKingForeman();
		XMLHandler handler = new XMLHandler();
		try
		{
			response = foreman.makeAPICall(OrdersBuilder.preview(a.getId(), b.build().toString(), ResponseFormat.XML));
		}
		catch (ForemanException | UtilityException e)
		{
			throw new ModelException("Make API Call", e);
		}

		try
		{
			map = handler.parseMarketOrderPreview(response.toString());
		}
		catch (UtilityException e)
		{
			throw new ModelException("", e);
		}
	}