Currently only per request controls can be inspected via the post process
method on a context processor. If a request control gives a different value
for each search result, then this cannot be inspected using the existing
support classes. An example control that requires this feature would be
22.214.171.124.126.96.36.199.188.8.131.52 Account usability control, that can be used with
for example the Sun ONE or the OpenDS directory servers.
The extended callback handler can pass hasControls to mapper.