TreeGrid: get all items

Vaadin 6 / 7 / 8
1

Hi,

what is the most efficient way to get all items (not just root items or specific children) from the TreeGrid?

This one just returns the root items…

public Stream<T> getAllItems() { return getDataProvider().fetch(new HierarchicalQuery<>(null, null)); } The only way right now would go through getTreeData().getChildren(item) recursively. Is there a better way?

2

Hi,

as far as I can tell, that’s the only way you can do it now. I think you’re better off fetching the items outside of the data provider - there’s no guarantee that there is an end to the hierarchy.

-Olli

3

Ok, thanks Olli!

for anyone who is interested, this would be my solution at the moment (TreeGrid subcassed):

    public List<T> getAllItems() {
        ArrayList<T> arr = new ArrayList<>();
        addItemsRecursively(null, arr);
        return arr;
    }

    private void addItemsRecursively(T inItem, ArrayList<T> inList) {
        if (inItem != null) {
            inList.add(inItem);
        }
        for (T item : getTreeData().getChildren(inItem)) {
            addItemsRecursively(item, inList);
        }
    }