BIND 10 #1287: ZoneIterator will need an internal finder

[BIND 10 Development]

#1287: ZoneIterator will need an internal finder
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            Reporter:  jinmei        |                        Owner:
                Type:  task          |                       Status:  new
            Priority:  major         |                    Milestone:  Next-
           Component:  data source   |  Sprint-Proposed
           Sensitive:  0             |                     Keywords:
         Sub-Project:  DNS           |              Defect Severity:  N/A
Estimated Difficulty:  0             |  Feature Depending on Ticket:
         Total Hours:  0             |          Add Hours to Ticket:  0
                                     |                    Internal?:  0
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 I suspect the ZoneIterator class will need to provide an interface
 of an "internal ZoneFinder" just like the ZoneUpdater class for the
 AXFR support: We need to get the SOA RR of the zone before iterating
 over the zone (and in general we wouldn't be able to assume we can
 get the SOA from the interator soon enough).

 In the database version of the implementation, both need to refer to
 the same version in terms of database updates, so the ZoneIterator will
 have to internally create a transaction.  It will also have to be
 clone()'ed
 from the original accessor (like ZoneUpdater).

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Ticket URL: <http://bind10.isc.org/ticket/1287>
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BIND 10 Development