8d1507cc3a
Monotone-Revision: 95af248444f21e7a45c7f512247840f4bf84e4bb Monotone-Author: wsourdeau@inverse.ca Monotone-Date: 2008-12-10T19:02:50 Monotone-Branch: ca.inverse.sogo
207 lines
5.4 KiB
Objective-C
207 lines
5.4 KiB
Objective-C
/*
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Copyright (C) 2004-2005 SKYRIX Software AG
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This file is part of SOPE.
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SOPE is free software; you can redistribute it and/or modify it under
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the terms of the GNU Lesser General Public License as published by the
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Free Software Foundation; either version 2, or (at your option) any
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later version.
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SOPE is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with SOPE; see the file COPYING. If not, write to the
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Free Software Foundation, 59 Temple Place - Suite 330, Boston, MA
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02111-1307, USA.
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*/
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#import <NGExtensions/NSCalendarDate+misc.h>
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#import "iCalRecurrenceCalculator.h"
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@interface iCalWeeklyRecurrenceCalculator : iCalRecurrenceCalculator
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@end
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#import <NGExtensions/NGCalendarDateRange.h>
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#import "iCalRecurrenceRule.h"
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#import "NSCalendarDate+ICal.h"
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@interface iCalRecurrenceCalculator (PrivateAPI)
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- (NSCalendarDate *) lastInstanceStartDate;
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- (unsigned) offsetFromSundayForJulianNumber: (long) _jn;
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- (unsigned) offsetFromSundayForWeekDay: (iCalWeekDay) _weekDay;
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- (unsigned) offsetFromSundayForCurrentWeekStart;
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- (iCalWeekDay) weekDayForJulianNumber: (long) _jn;
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@end
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/*
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TODO: If BYDAY is specified, lastInstanceStartDate and recurrences will
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differ significantly!
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*/
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@implementation iCalWeeklyRecurrenceCalculator
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- (NSArray *)
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recurrenceRangesWithinCalendarDateRange: (NGCalendarDateRange *) _r
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{
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NSMutableArray *ranges;
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NSCalendarDate *firStart;
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long i, jnFirst, jnStart, jnEnd, startEndCount;
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unsigned interval, byDayMask;
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firStart = [firstRange startDate];
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jnFirst = [firStart julianNumber];
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jnEnd = [[_r endDate] julianNumber];
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if (jnFirst > jnEnd)
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return nil;
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jnStart = [[_r startDate] julianNumber];
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interval = [rrule repeatInterval];
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/* if rule is bound, check the bounds */
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if (![rrule isInfinite])
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{
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NSCalendarDate *until;
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long jnRuleLast;
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until = [rrule untilDate];
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if (until)
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{
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if ([until compare: [_r startDate]] == NSOrderedAscending)
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return nil;
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jnRuleLast = [until julianNumber];
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}
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else
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{
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jnRuleLast = (interval * [rrule repeatCount] * 7)
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+ jnFirst;
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if (jnRuleLast < jnStart)
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return nil;
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}
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/* jnStart < jnRuleLast < jnEnd ? */
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if (jnEnd > jnRuleLast)
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jnEnd = jnRuleLast;
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}
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startEndCount = (jnEnd - jnStart) + 1;
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ranges = [NSMutableArray arrayWithCapacity: startEndCount];
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byDayMask = [rrule byDayMask];
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if (!byDayMask)
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{
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for (i = 0 ; i < startEndCount; i++)
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{
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long jnCurrent;
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jnCurrent = jnStart + i;
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if (jnCurrent >= jnFirst)
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{
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long jnDiff;
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jnDiff = jnCurrent - jnFirst; /* difference in days */
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if ((jnDiff % (interval * 7)) == 0)
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{
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NSCalendarDate *start, *end;
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NGCalendarDateRange *r;
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start = [NSCalendarDate dateForJulianNumber: jnCurrent];
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[start setTimeZone: [firStart timeZone]];
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start = [start hour: [firStart hourOfDay]
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minute: [firStart minuteOfHour]
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second: [firStart secondOfMinute]];
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end = [start addTimeInterval: [firstRange duration]];
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r = [NGCalendarDateRange calendarDateRangeWithStartDate: start
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endDate: end];
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if ([_r containsDateRange: r])
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[ranges addObject: r];
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}
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}
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}
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}
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else
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{
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long jnFirstWeekStart, weekStartOffset;
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/* calculate jnFirst's week start - this depends on our setting of week
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start */
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weekStartOffset = [self offsetFromSundayForJulianNumber: jnFirst] -
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[self offsetFromSundayForCurrentWeekStart];
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jnFirstWeekStart = jnFirst - weekStartOffset;
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for (i = 0 ; i < startEndCount; i++)
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{
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long jnCurrent;
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jnCurrent = jnStart + i;
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if (jnCurrent >= jnFirst)
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{
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long jnDiff;
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/* we need to calculate a difference in weeks */
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jnDiff = (jnCurrent - jnFirstWeekStart) % 7;
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if ((jnDiff % interval) == 0)
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{
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BOOL isRecurrence = NO;
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if (jnCurrent == jnFirst)
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{
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isRecurrence = YES;
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}
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else
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{
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iCalWeekDay weekDay;
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weekDay = [self weekDayForJulianNumber: jnCurrent];
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isRecurrence = (weekDay & [rrule byDayMask]) ? YES : NO;
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}
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if (isRecurrence)
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{
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NSCalendarDate *start, *end;
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NGCalendarDateRange *r;
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start = [NSCalendarDate dateForJulianNumber: jnCurrent];
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[start setTimeZone: [firStart timeZone]];
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start = [start hour: [firStart hourOfDay]
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minute: [firStart minuteOfHour]
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second: [firStart secondOfMinute]];
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end = [start addTimeInterval: [firstRange duration]];
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r = [NGCalendarDateRange calendarDateRangeWithStartDate: start
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endDate: end];
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if ([_r containsDateRange: r])
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[ranges addObject: r];
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}
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}
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}
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}
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}
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return ranges;
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}
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- (NSCalendarDate *) lastInstanceStartDate
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{
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NSCalendarDate *firStart, *lastInstanceStartDate;
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if ([rrule repeatCount] > 0)
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{
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firStart = [firstRange startDate];
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lastInstanceStartDate = [firStart dateByAddingYears: 0 months: 0
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days: (7 * [rrule repeatInterval]
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* [rrule repeatCount])];
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}
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else
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lastInstanceStartDate = [super lastInstanceStartDate];
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return lastInstanceStartDate;
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}
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@end /* iCalWeeklyRecurrenceCalculator */
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