BIND 10 #2497: introduce wrapper version of "from lexer" rdata factory

[BIND 10 Development]

#2497: introduce wrapper version of "from lexer" rdata factory
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            Reporter:  jinmei        |                        Owner:  muks
                Type:  task          |                       Status:
            Priority:  medium        |  reviewing
           Component:  libdns++      |                    Milestone:
            Keywords:                |  Sprint-20121204
           Sensitive:  0             |                   Resolution:
         Sub-Project:  DNS           |                 CVSS Scoring:
Estimated Difficulty:  0             |              Defect Severity:  N/A
         Total Hours:  0             |  Feature Depending on Ticket:
                                     |  loadzone-ng
                                     |          Add Hours to Ticket:  0
                                     |                    Internal?:  0
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Comment (by muks):

 Replying to [comment:22 jinmei]:
 > Replying to [comment:20 muks]:
 >
 > > > {{{#!python
 > > > new_rdatafactory_users = []
 > > > }}}
 > > >   No one except the original author can figure out what should be
 > > >   added to the list when a new type is supported unless they bother
 to
 > > >   read the code to understand how this list is used.
 > >
 > > * Comments were added
 > > * The list takes tuples of (rrtype, rrclass) now.
 >
 > I'm afraid this doesn't cover the pairs of generic types for class
 > "IN" like this:
 > {{{#!cpp
 >         add("SOA", 6, "IN", 1, RdataFactoryPtr(new
 OldRdataFactory<generic::SOA>()));
 > }}}
 >
 > It's probably due to poor/no documentation of the script, but we have
 > this trick as a heuristics optimization for class "IN":
 > {{{#!python
 >                         if class_txt == 'generic':
 >                             typeandclass.append((type_txt,
 int(type_code),
 >                                                  (class_txt, 'in'), 1))
 > }}}
 >
 > So, for example, if we have ('xxx', 'generic') in
 new_rdata_factory_users,
 > we need to handle the case of ('xxx', 'in'), too.  One easy way to
 > just clarify it in the comment (after all this is temporary
 > workaround).  Another is to handle it automatically in
 generate_rrparam().

 I've updated the code to handle this, and also verified it with a
 `[('soa', 'generic')]` sample list, which also applies it to the `('soa',
 'in')` case.

-- 
Ticket URL: <http://bind10.isc.org/ticket/2497#comment:24>
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