public static Map<ClientDetails, List<Order>> groupOrdersByClient(List<Order> orders) {

    	Map<ClientDetails, List<Order>> ordersByClientMap = new HashMap<ClientDetails, List<Order>>();

    	List<ClientDetails> clients = new ArrayList<ClientDetails>();

    	for (Order order : orders) {
    		if (!clients.contains(order.getClientDetails())) {
    			clients.add(order.getClientDetails());
    		}
    	}

    	for (ClientDetails client : clients) {
    		ordersByClientMap.put(client, new ArrayList<Order>());

    		for (Order order: orders) {
    			if (order.getClientDetails() == client) {
    				ordersByClientMap.get(order.getClientDetails()).add(order);
    			}
        	}
    	}

    	return ordersByClientMap;
    }