How to lazy initialize iterators?

Question

Hello,
I'm using JDeveloper 11.1.1.4.0.
In Managed bean c'tor, I am getting the row attribute values from an iterator, Iterator1. These values are then stored in session.
Subsequently I need to use these session values to fetch data from another iterator, say Iterator2.
Following is the code written.
        DCIteratorBinding iterator =
            ((DCBindingContainer)BindingContext.getCurrent().getCurrentBindingsEntry()).findIteratorBinding(iteratorName);getCurrentBindingsEntry() calls Iterator2, tries to initialize it and does not find Iterator1 values in session. It then throws NullPointer exception.
How do I ensure that getCurrentBindingsEntry() does NOT initializing all the iterators in the same binding?
Regards,
Amar

Answer 1

John,
Here is the use case:
1. My page has a few multiSelectCheckboxes, selectOneChoice and three tables. Each of these is based on different iterators.
2. In managed bean c'tor, multiSelectCheckboxes and selectOneChoice are to be populated. I'm fetching each of the iterator rows using the code given below.
    private ArrayList getAllIteratorValues(String iteratorName,
                                           String attributeName) {
        DCIteratorBinding iterator =
            ((DCBindingContainer)BindingContext.getCurrent().getCurrentBindingsEntry()).findIteratorBinding(iteratorName);
        ArrayList attributeValues = new ArrayList();
        for (int i = 0; i < iterator.getEstimatedRowCount(); i++) {
            Row row = iterator.getRowAtRangeIndex(i);
            Object attribute = "";
            attribute = row.getAttribute(attributeName);
            attributeValues.add(attribute);
        return attributeValues;
    }3. The populated values are stored in session. I'm required to do this as the same values are required on some other pages as well.
4. Table iterators are to be executed using session values.
While executing step 2 above, when it calls BindingContext.getCurrent().getCurrentBindingsEntry(), it executes the VOImpl for one of the tables. In this VOImpl, it looks for the session values and throws NullPointerException.
So is there any way to populate only one iterator at a time (the ones for selectOneChoice/multipleCheckBox) and not all the iterators in 'bindings'?
Amar