Thanks Igor and Doug,
I'll check things out when the boss agrees
bbrrr ...
On Fri, Apr 25, 2008 at 12:39 AM, Doug Donohoe <[EMAIL PROTECTED]> wrote:
>
> This may help. I am moving my DD Poker site to wicket and implemented an
> IDataProvider around my database service as follows:
>
> private class HistoryData implements IDataProvider
> {
> private static final long serialVersionUID = 42L;
>
> private PokerUser user;
> private int count;
>
> private HistoryData(PokerUser user)
> {
> this.user = user;
> count =
> histService.getAllTournamentHistoriesForProfileCount(user.getId());
> }
>
> @SuppressWarnings({"RawUseOfParameterizedType"})
> public Iterator iterator(int first, int pagesize)
> {
> return
> histService.getAllTournamentHistoriesForProfile(user.getId(), count,
> first,
> pagesize).iterator();
> }
>
> public int size()
> {
> return count;
> }
>
> public boolean isEmpty()
> {
> return count == 0;
> }
>
> public IModel model(Object object)
> {
> return new CompoundPropertyModel(new EntityModel(object));
> }
>
> public void detach()
> {
> }
> }
>
> Where EntityModel is:
>
> public class EntityModel extends CompoundPropertyModel
> {
> private static final long serialVersionUID = 42L;
>
> /**
> * Constructor
> *
> * @param object The model object, which may or may not implement
> IModel
> */
> public EntityModel(Object object)
> {
> super(new NonLoadableDetachableModel(object));
> }
> }
>
> and NonLoadableDetachableModel is
>
> public class NonLoadableDetachableModel extends LoadableDetachableModel
> {
> private static final long serialVersionUID = 42L;
>
> public NonLoadableDetachableModel(Object model)
> {
> super(model);
> }
>
> @Override
> protected Object load()
> {
> throw new UnsupportedOperationException("load should never be
> called");
> }
> }
>
> I created this last class because my pages are read-only and the result
> set
> is always fetched through the service. I didn't want to have my (JPA
> based)
> entities being serialized.
>
> The HistoryData class worked great with the base DataView class in Wicket.
>
> Note that I drew a lot of inspiration from:
>
> http://wicketstuff.org/wicket13/repeater/
>
> and digging around in the source.
>
> I don't know if this will help you or not - hopefully so!
>
> -Doug
>
>
> Eyal Golan wrote:
> >
> > Hi,
> > Can anyone give me an explanation about paging with DetachableModel?
> >
> > My problem:
> > We have records in the DB that can be a-lot.
> > We also filter them sometimes.
> >
> > someone in the company created a non-standard paging.
> > He doesn't use the Wicket's paging.
> >
> > The iterator method of the DataProvider he created returns only the
> number
> > of elements that should be displayed in the current page.
> > Eg. suppose we decided we show 20 records per page.
> > The DataProvider keeps track on which page we're at.
> > Then he calculates the indexes of records.
> > It's done in getVisibleTickets() method.
> > int fromIndex = (currentPage - 1) * (ticketsPerPage);
> > int toIndex = ticketsPerPage;
> >
> > And then he asks the DB for the records in this range (with the filter).
> > This is the size() method:
> > public int size() {
> > if ((visibleTickets == null) || (update)) {
> > getVisibleTickets();
> > }
> > return visibleTickets.size();
> > }
> >
> > OK, I hope i was clear enough.
> > I know that it might be done using Wicket's library.
> > Can anyone explain?
> >
> > Thanks
> > --
> > Eyal Golan
> > [EMAIL PROTECTED]
> >
> > Visit: http://jvdrums.sourceforge.net/
> >
> >
>
> --
> View this message in context:
> http://www.nabble.com/intro-and-explanation-about-DataTable-and-DetachableModel-tp16852272p16853277.html
> Sent from the Wicket - User mailing list archive at Nabble.com.
>
>
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>
--
Eyal Golan
[EMAIL PROTECTED]
Visit: http://jvdrums.sourceforge.net/
