This adds a Java-language implementation of EventRecurrence.parse(),
to make it easier to relocate it for the benefit of unbundled
Calendar.
Differences from the native version:
- enforces that FREQ appears first
- allows (but ignores) X-* parts
- improved validation on various values
- error messages are more specific
- enforces that only one of UNTIL and COUNT may be present [disabled]
- allows lower-case property and enumeration values [disabled]
As part of the transition process, both versions of the parser are
called on every request, and the results are compared. If the results
are different a warning message is logged.
An unnecessary constructor was removed.
This also this moves some EventRecurrence tests out of CalendarProvider,
into coretests, and adds a simple parse test with the examples from
the RFC.
Bug 4575374
Change-Id: If737ed1272fda65c93363d87b2da12b85e644f5b
ae633b2d36