[threeten-dev] TzdbZoneRulesCompiler

[Xueming Shen]

This is the first draft to pull the tzdb compiler out of the core 
javax.time.zone
package. "Inevitably" it brings the ZoneRulesBulder with it and then the
StandardZoneRules and finally the Ser:-)

Now ZoneOffsetTransition and ZoneOffsetTransitionRule completely outsource
its serialization to the Ser. Arguably, it should be fine to just leave 
the serialization
stuff of these two classes to the default implementation, or further, 
not serializable
at all (any third-party ZoneRules implementation, if any, can feel free 
to implement
their serialization form for these two, if they are needed in their 
ZoneRules serialization
form...). The implementation will be clearer, if we give up the 
serialization of these
two classes. We still keep those read/write of these two for SZR.

There are still 2 issues in ZoneOffsetTransition class. The big one is 
that it appears
we have bunch of "transitions" that have the same before and after 
offset from the
builder/compiler, I have not looked into the details of these 
"transitions". This was being
workaround-ed by a package private constructor in ZoneOffsetTransition, 
need to figure
out the best solution. The small one is that the toEpochSecond() method, 
which is
"frequently" used by the builder and the SZR, is it worth make it 
public, or I should have
it as the utility method somewhere in sun.time.zone.

The package name of sun.time.zone is picked, just because I don't have a 
better one
for now.  The "compiler" itself actually can be anywhere later, probably 
will be in a
"tool" area of jdk, if we indeed decide to make it public.

Opinion?  the surgery is too big?

http://cr.openjdk.java.net/~sherman/jdk8_threeten/tzcompiler