[BC4J] Master currency change + dirty details = warning (how?)

Question

Sorry for the lame subject, but it's the best I could do. :)
Anyway, I 'want' something, but I could use some advice on how to accomplish it. Here's what I've been trying to realise:
- A simple master-detail scenario
- One of the detail records has been altered
- The master currency changes
- A popup comes up to warns me to either commit or rollback pending changes
And
- One of the master records has been altered
- The master currency changes
- Nothing happens
I hope this explains what I need. :) So far I've created a new CustomViewObjectImpl class which I use as a base for all my ViewObjects. In this new class I override the executeQueryForCollection() method, because if I'm not mistaken, this is the location where the check for dirty details should be performed.
However, a simple call to getDBTransaction().isDirty() is too simplistic, too unspecific.
I think I somehow need to end up with a ViewRowSetIterator instance (which has the isDirty() method) which is contained or derived from one of the detailRowSets of "this". Any ideas of how I can retrieve it?
So far, I've got something like this:
protected void executeQueryForCollection(Object qc,
                                         Object[] params,
                                         int noUserParams)
RowSet[] details = getDetailRowSets();
ViewRowSetIteratorImpl vrsi;
for (int i = 0; i < details.length; i++)
  vrsi = ....; // how to retrieve it ?
  if (vrsi.isDirty())
    switch (JOptionPane.showConfirmDialog(null,
                                          "Save changes?",
                                          "Attention",
                                          JOptionPane.YES_NO_OPTION,
                                          JOptionPane.WARNING_MESSAGE))
      case JOptionPane.YES_OPTION:
        getDBTransaction().commit();
        break;
      default:
        getDBTransaction().rollback();
        break;
super.executeQueryForCollection(qc, params, noUserParams);
}

Answer 1

Hi,
I had a quite similar need, except the "Nothing happens" part on altered master.
I realize this makes quite a difference, but maybe my solution could help you somehow.
After trying several possibilities, I considered the following approach.
1. I extended ViewRowImpl in MyViewRowImpl and wrote the following:
     private boolean areDetailsModified()
          String[]          viewLinks = getViewObject().getViewLinkNames();
          for( int i = 0; i < viewLinks.length; i++ )
               ViewLink          viewLink = getApplicationModule().findViewLink( viewLinks[ i ] );
               ViewObject     detailView = viewLink.getDestination();
               Row          linkRow = null;
               if( detailView.isExecuted() )
                    linkRow = detailView.getCurrentRow();
               if( linkRow != null && viewLink.getSource() == getViewObject() &&
                   linkRow instanceof MyViewRowImpl &&
                   ( (MyViewRowImpl)linkRow ).getViewRowState() != Entity.STATUS_UNMODIFIED )
                    return true;
          return false;
      * Assume a view row creates/updates/removes its main entity.
      * If the row itself was not modified, checks for changes in details.
     public byte getViewRowState()
          Entity          entity = getEntity( 0 );
          switch( entity.getEntityState() )
               case Entity.STATUS_INITIALIZED:
               case Entity.STATUS_NEW:
                    return Entity.STATUS_NEW;
               case Entity.STATUS_MODIFIED:
                    return Entity.STATUS_MODIFIED;
               case Entity.STATUS_UNMODIFIED:
                    if( !entity.isValid() || areDetailsModified() )
                         return Entity.STATUS_MODIFIED;
                    break;
          return Entity.STATUS_UNMODIFIED;
     }2. In my JClient client (still to use for the UIX one), I installed a JUPanelValidationListener and implemented
     public void beforeCurrencyChange( JUPanelValidationEvent event )
          Row          row = event.getIteratorBinding().getCurrentRow();
          int          rowState = Entity.STATUS_MODIFIED;
          if( row instanceof MyViewRow )
               rowState = ( (MyViewRow)row ).getViewRowState();
     }3. And yes, not so fancy, I also made some changes to trace a "user-dirty" transaction (for some insert vs. LOV issues)...
Greetings,
Adrian