Chronologies are basically containers of fields. The other code
contained in a Chronology implementation is their mainly for performance
optimization. Also, AssembledChronology allows field implementations to
be shared with different chronologies. The best way to implement a
chronology from scratch is to start implementing some fields.
An another example is the TestGJChronology and its subclasses,
TestGregorianChronology and TestJulianChronology. They are included in
the test suite, and implement those chronologies with much less code.
They are intended for test purposes only, and they don't perform well.
They do show how one could start a new chronology and then optimize later.
Claudio Nieder wrote:
Hi,
Joda-Time supports only a few Chronologies.
Here http://joyds1.joensuu.fi/calendar/index.html someone implemented a lot of
different calendars. I wonder if it would be possible to write a generic
wrapper allowing you the create a Joda Chronology out of them. Something
looking like this
import fi.joensuu.joyds1.calendar.Calendar;
import org.joda.time.Chronology;
class ChronoWrapper implements Chronology {
private Calendar calendarsInstance;
public ChronologyWrapper(Calendar calendarsInstance)
{
this.calendarsInstance=calendarsInstance;
}
...Chronology methods delegating to calendarsInstance...
}
Yet I got dizzy when I just looked at Jodas Chonology and BuddhistChronology
to try to understand how to implement such a Chonology: the two classes
import each other.
Does this straightly rule out, that you can build such a wrapper?
Also, is there a good "How to implement a Joda-Time Chronology" document?
claudio
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