Paginator EJB and DataModel

[monkeyden]

I have implemented a Paginator SFSB and use it within my Seam action (also SFSB). I expose the paginator itself to the web layer using @Out.

Currently, the paginator's collection is annotated with @DataModel, and that works fine for rendering and paginating. The Seam action has the @DataModelSelection which obviously does not work correctly. The question I have is, can you annotate using @DataModel and @DataModelSelection in two different classes?

A SFSB Paginator didn't seem right to me so I also thought about extending DataModel for the paginator, and annotating that with @DataModel in the Seam action, which is probably the right way to go.

Thanks for the suggestions.

[monkeyden]

Gavin,
I extended your ListDataModel for this and used @Out instead of @DataModel. My extension provides the methods used for pagination and sorting and, in doing so, attempts to manipulate the super classes attributes (rowCount, rowIndex and wrappedData). The exception I'm getting is:

attempted to bind an Out attribute of the wrong type to: userSearchAction.paginator

Everything works fine up until Seam attempts to outject it. Maybe I'm misunderstanding how your code works. Is it not simply outjected as a ListDataModel?

Here is the relevant code:

My Seam action

public class UserSearchAction implements UserSearch
@Out(required=false)
private ListDataModelPaginator paginator;
...
Query query = em.createQuery(query);
paginator = new ListDataModelPaginator(query.getResultList());
paginator.sort(ASC_NAME_COMPARATOR);
...
}

Paginator

public class ListDataModelPaginator extends ListDataModel {

 private int rowsPerPage = 20;

 public ListDataModelPaginator() {
 super(new ArrayList());
 }

 public ListDataModelPaginator(List list) { super(list); }

 public ListDataModelPaginator(List list, Comparator comp) {
 super(list);
 }

 public void scrollFirst() {
 setRowIndex(0);
 }

 public void scrollPrevious() {
 setRowIndex(getRowIndex()-rowsPerPage);
 if (getRowIndex() < 0) {
 setRowIndex(0);
 }
 }

 public void scrollNext() {
 setRowIndex(getRowIndex()+rowsPerPage);
 if (getRowIndex() >= getRowCount()) {
 setRowIndex(getRowCount() - rowsPerPage);
 if (getRowIndex() < 0) {
 setRowIndex(0);
 }
 }
 }

 public void scrollLast() {
 setRowIndex(getRowCount() - rowsPerPage);
 if (getRowIndex() < 0) {
 setRowIndex(0);
 }
 }

 public boolean getIsScrollFirstDisabled() {
 return getRowIndex() == 0;
 }

 public boolean getIsScrollLastDisabled() {
 return getRowIndex() >= getRowCount() - rowsPerPage;
 }

 public boolean getIsScrollNextDisabled() {
 return getRowIndex() >= getRowCount() - rowsPerPage;
 }

 public boolean getIsScrollPreviousDisabled() {
 return getRowIndex() == 0;
 }

 public int getRowsPerPage() {
 return rowsPerPage;
 }

 public void setRowsPerPage(int rowsPerPage) {
 this.rowsPerPage = rowsPerPage;
 }

 public void setSortedList(List items){
 super.setWrappedData(items);
 super.setRowIndex(0);
 }

 public void sort(Comparator comp){
 List unsorted = (List)getWrappedData();
 Collections.sort(unsorted, comp);
 super.setWrappedData(unsorted);
 super.setRowIndex(0);
 }
}

[gavin.king]

Looks like you have a Seam component called "paginator" floating around somewhere in your project. Remove it.