_FacetsAndChildrenIterator(Map facetMap,
    List childrenList) 
{
        _facetsIterator   = facetMap != null ? facetMap.values().iterator() : null;
        _childrenIterator = childrenList != null ? childrenList.iterator() : null;
}

 public boolean hasNext() 
{
        return (_facetsIterator != null && _facetsIterator.hasNext()) ||
               (_childrenIterator != null && _childrenIterator.hasNext());
}

 public Object next() 
{
        if (_facetsIterator != null && _facetsIterator.hasNext())
        {
            return _facetsIterator.next();
        }
        else if (_childrenIterator != null && _childrenIterator.hasNext())
        {
            return _childrenIterator.next();
        }
        else
        {
            throw new NoSuchElementException();
        }
}

 public  void remove() 
{
        throw new UnsupportedOperationException(this.getClass().getName() + " UnsupportedOperationException");
}