MiG InfoCom MiG Calendar Tutorial - Manual (Page 13)

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• Setting a different time zone for the date area will generally only
change the times on the date/time headers. However if you create
a date range by saying it should span a day or a week and provide
a different time zone that will mean the date area will span another
physical time since the day/week boundary is probably different in
the other time zone.
• The time zone generally affects calculations that deal with hour-of-
day and such properties of the time. Rounding to a date boundary
will for instance give different physical date/times in different time
zones.
• When printing a DateRange to the command line the time zone
will be honored. Printing a Date object will always use in the
default time zone for the machine. By using a
SimpleDateFormat you can choose the time zone used when
printing a Date by setting a different Calendar object on it or
changing the time zone for the current one.
• If no time zone is specified (set to null) in an activity's date range,
that activity will get the default time zone. The default time zone will
not be set at creation time though, it will be re-evaluated for every
use, so changing the default time zone will affect all activities with
a
null time zone set.
ActivityDepository
Where Activities are found
One problem with activities is that they are usually stored not withing
the calendaring component, in fact that would be a bad design. Also
they can be scattered over more than one storage medium, possibly
at least one that are not connected continuously. Since the can be
stored in multiple places they can also come out of sync, i.e. the same
activity exists in different versions on different storage mediums.
These situations have to be addressed by the
ActivityDepository .
Subscriptions
From the MiG Calendar's positions things are quite simple. Every
DateArea , or at least DefaultDateArea , only registers itself as
a listener on the depository and will as such get notified of changes in
the depository. This is normally handled automatically.
ActivityIOFilters
MiG Calendar Tutorial Page 13 / 24