Problem with Filter on Griid Version 8xx

Vaadin 6 / 7 / 8
1

If somebody can give some clear explanation how one can filter the Vaadin Grid 8?
There is only explanation on this page.
https://stackoverflow.com/questions/42475774/how-to-add-grid-filters-in-vaadin-8.
But the casting of the DataProvider is not working directly
I have the some class(Here is only some example Text-column)

public class Notes implements Serializable {
private String description;
//...
  public String getDescription() {
        return description;
    }
      public void setDescription(String description) {
        this.description = description;
    }
}

And the Grid Class

public class NewNotesGrid extends Grid<Notes> {
public NewNotesGrid() {
//...
}

I have the Dataprovider

public class NewNotesDataProvider extends FilterablePageableDataProvider<Notes, Object>{   
//...
}

Grir and DataProvider are working perfectly and showing some datas.

With an attempt to make the Text Filter on the Grid which is described on the high mentioned page:
private void onNameFilterTextChange(HasValue.ValueChangeEvent<String> event) { ListDataProvider<Notes> dataProvider = (ListDataProvider<Notes>) notesGrid.getDataProvider(); dataProvider.setFilter(Notes::getDescription, s -> caseInsensitiveContains(s, event.getValue())); }
I get the casting error:
[b]
java.lang.ClassCastException: com.notes.frontend.home.ui NewNotesDataProvider cannot be cast to com.vaadin.data.provider.ListDataProvider.

[/b]
Maybe somebody can give the clear explanation how one can build the Text Filter on the Grid Vaadin 8***?

2

there is some more reference:
https://vaadin.com/forum/#!/thread/15295682/15296445

but how getallYourObjects() typically looks like?

3

Your casting wont work if FilterablePageableDataProvider is not descendant of ListDataProvider, but I assume you can cast to NewNotesDataProvider if it implements the interfaces needed. I assume you have implemented your custom Grid to use it.

4

Thank you, Tatu Lund!
It was helpful.
By the way… There is some small mistake in the Vaadin page about the Grid-Filter:
https://vaadin.com/forum/#!/thread/15295682/15296445

columnPredicate = yourObject -> (yourObject.getColumn1().equals(filterColumn1.getValue()) && yourObject.getColumn2().equals(filterColumn2.getValue()));
        return columnPredicate;

For this filter to be worked one have to change "
equals"
to
“contains”