unitizerList
ObjectJKExtraction process is a combination of steps:
Move Internal pointer with nextItem
or prevItem
Retrieve item getItem
Check whether we're done iterating with done
done
will return TRUE if the pointer is on either the
first or last entry depending on what direction you are iterating.
If you wish to iterate from the last item forward, you should either
reset
with parameter reverse
set to TRUE, or re-order
the items.
# S4 method for unitizerList
nextItem(x)
a unitizerList
object
unitizerList
for getItem
,
an item from the list, which could be anything