Another solution would be to put all the complexity of managing items into a
general CartPanel class, but that wont get much cleaner I guess. One thing
that comes to mind is, If you have a Pricing domain object to handle pricing
issues, and a Summary object to handle the items summary , you can somehow
get rid of the inheritance hierarchy and manage them with a single Item
class at the top, and two dependent objects(Pricing and Summary). The actual
smell I sniff in your code is the parallel inheritance hierarchies in the
domain objects and UI. Thats what forces you to use a factory.
On 3/1/07, Eelco Hillenius <[EMAIL PROTECTED]> wrote:
On 2/28/07, Scott Swank <[EMAIL PROTECTED]> wrote:
> In our application we have several places where we are construction an
> html table but the content of the rows varies by ProductType. For
> example:
>
> column 1. always an image
> column 2. the pricing: for hotels by room, for shows by ticket, for
> limo by hours
> column 3. item summary: for hotels the rooms/nights, for shows the
> seats and show time, etc
> column 4. the total
>
> There is a natural class hierarchy here where we have
>
> AbstractItem
> HotelItem
> ShowItem
> LimoItem
>
> I'd like to have a comparable hierarchy of perhaps "RepeaterRow"
> objects that could have methods such as:
>
> AbstractItemRow
> protected abstract Panel getPricingPanel();
> protected abstract Panel getSummaryPanel();
>
> I've gotten this working with a ListView, but I'm doing things like:
>
> populateItem(ListItem listItem) {
> final AbstractItem cartItem =
(AbstractItem)listItem.getModelObject();
> add(CartPanelFactory.getPricingPanel(cartItem));
> add(CartPanelFactory.getSummaryPanel(cartItem));
> }
>
> Is there a cleaner way than delegating this decision about which Panel
> I need to a factory?
That looks like a fine pattern to me tbh. What don't you like about it?
Eelco
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