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ALF-11562 Support for building Java TZ objects from iCal timezones that use DST, with tests

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git-svn-id: https://svn.alfresco.com/repos/alfresco-enterprise/alfresco/HEAD/root@32749 c4b6b30b-aa2e-2d43-bbcb-ca4b014f7261
This commit is contained in:
Nick Burch
2011-12-14 04:23:13 +00:00
parent 3e0bb94351
commit f8d8ccdd0a
2 changed files with 164 additions and 4 deletions
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77
source/java/org/alfresco/service/cmr/calendar/CalendarTimezoneHelper.java
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@@ -113,7 +113,8 @@ public class CalendarTimezoneHelper
{
tzID = "(unknown)";
}
tzID.replaceAll("\\\\", "");
// De-escape commans
tzID = tzID.replace("\\,", ",");
// Does it have daylight savings?
if (tzDaylight.isEmpty())
@@ -123,8 +124,22 @@ public class CalendarTimezoneHelper
return new SimpleTimeZone(offset, tzID);
}
// TODO
return null;
// Get the offsets
int stdOffset = getOffset(tzDaylight.get("TZOFFSETFROM"));
int dstOffset = getOffset(tzDaylight.get("TZOFFSETTO"));
// Turn the rules into SimpleTimeZone ones
int[] stdRules = getRuleForSimpleTimeZone(tzStandard.get("RRULE"));
int[] dstRules = getRuleForSimpleTimeZone(tzDaylight.get("RRULE"));
// Build it up
return new SimpleTimeZone(
stdOffset, tzID,
dstRules[0], dstRules[1], dstRules[2], // When DST starts
1*60*60*1000, // TODO Pull out the exact change time from DTSTART
stdRules[0], stdRules[1], stdRules[2], // When DST ends
2*60*60*1000 // TODO Pull out the exact change time from DTSTART
);
}
/**
@@ -156,6 +171,62 @@ public class CalendarTimezoneHelper
return offset;
}
/**
* Turn an iCal repeating rule like
* "FREQ=YEARLY;BYDAY=-1SU;BYMONTH=10" into a SimpleTimeZone rule
* like Month=March, StartDay=0, StartDayOfWeek=-Sunday
* See the JavaDocs of {@link SimpleTimeZone} for how to express
* the different requirements in the required int formats
*/
private static int[] getRuleForSimpleTimeZone(String rule)
{
// Turn the rule into chunks
Map<String,String> params = new HashMap<String, String>();
for (String p : rule.split(";"))
{
int splitAt = p.indexOf('=');
if (splitAt == -1)
{
logger.info("Skipping invalid param " + p + " in recurrence rule " + rule);
}
else
{
params.put(p.substring(0,splitAt), p.substring(splitAt+1));
}
}
// Java months are 1 less than normal
int month = Integer.parseInt(params.get("BYMONTH")) - 1;
// Should end with a day of the week
String byDay = params.get("BYDAY");
String dow = byDay.substring(byDay.length()-2);
int dayOfWeek = CalendarRecurrenceHelper.d2cd.get(dow);
// Where in the month does it come?
int dayOfMonth = 0;
if (byDay.startsWith("-1"))
{
// Last in month
dayOfMonth = -1;
}
else if (byDay.startsWith("1"))
{
// First in month
dayOfMonth = 1;
dayOfWeek = 0 - dayOfWeek;
}
else
{
// Nth day in month
dayOfMonth = 1 + (Integer.parseInt(byDay.substring(0,1)) - 1)*7;
dayOfWeek = 0 - dayOfWeek;
}
// All done
return new int[] {month, dayOfMonth, dayOfWeek};
}
/**
* Turns an iCal event into event + timezone parameters.
* This is very closely tied to the SPP / VTI implementation,