DataTable RowKeyVar problem

[gizola]

Hi!

I'm facing a small problem. Due to performance reasons I've created an own datamodel for the rich:datatable component. In this datamodel (wich extends ModifiableModel) I check wether the sorting or filtering has been changed since last rendering, or not. If not I use the cached data to display the records (wich incredibly increases paging perfomance with datascroller for huge datasets!) and if only the sorting changed, I resort the cached data without retrieving the whole dataset, refiltering and then sorting as implemented in ExtendedDataModel.

Now the problem is that if I define a rowkeyvar in the DataTable to display row numbers, the row numbers are mixed upon filtering or sorting.

Like:

Datatable using normal data model:

rowkeyvar data
1. something
2. anything

Now this sorted by data:

rowkeyvar data
1. anything
2. something

With my datamodel:

rowkeyvar data
1. something
2. anything

Now this sorted by data:

rowkeyvar data
2. anything
1. something

As you see the rowkeyvar was maintained and "mixed". This also happens with filtering.

I know the reason: the original data list from the dataprovider is untouched and the rowkeys are maintained for the original list.

My question is how to implement a "rownum" variable similar to rowkeyvar where I could display always the correct row number from 1 to rowcount?

I examined the UIDataAdaptor code a lot to implement a RowNum variable similar to RowKeyVar, but no idea till now how to reset it and increment it by row to row.

Thank you in advance!

Regards,

Gizola

PS: oh, yes, Richfaces 3.3.0 GA I'm using.

[nbelaevski]

Hi Gizola,

Model generates row keys in walk(...) method. You can override it to generate sequential keys for rows.

[gizola]

Hi!

Thanks for the answer. Now this is my walk method:

@Override
 public void walk(FacesContext context, DataVisitor visitor, Range range, Object argument) throws IOException
 {
 final SequenceRange seqRange = (SequenceRange) range;
 int rows = seqRange.getRows();
 int rowCount = getRowCount();
 int currentRow = seqRange.getFirstRow();
 if (rows > 0)
 {
 rows += currentRow;
 rows = Math.min(rows, rowCount);
 }
 else
 {
 rows = rowCount;
 }
 for (; currentRow < rows; currentRow++)
 {
 visitor.process(context, rowKeys.get(currentRow), argument);
 }
 }

The currentRow variable contains the sequential key, but I have to get the apropriate rowKey from the rowKeys to display correct row in the datatable. How to implement here a sequential row key when the rowKeys are mixed in my rowKeys variable (according to sorting and filtering)?

Thank you for helping.

Regards,

Gizola

[gizola]

Well I finally solved the problem. I had to override getRowKey and setRowKey methods also (or at least make small changes in them).

Not it is working.

Thanks for the hint.

Regards,

Gizola

[gizola]

"Not it is working" was of course mistyped :)

Now it is working is the right sentense.

Regards,

Gizola