public void addIterator(OJBIterator iterator)
    {
        /**
         * only add iterators that are not null and non-empty.
         */
        if (iterator != null)
        {
            if (iterator.hasNext())
            {
                setNextIterator();
                m_rsIterators.add(iterator);
            }
        }
    }
public void addIterator ( OJBIterator iterator ) { if ( iterator != null ) { if ( iterator . hasNext ( ) ) { setNextIterator ( ) ; m_rsIterators . add ( iterator ) ; } } }
use this method to construct the ChainingIterator
iterator by iterator.