err.no Git - sope/blob - sope-ical/NGiCal/iCalYearlyRecurrenceCalculator.m

   1 /*
   2   Copyright (C) 2004-2005 SKYRIX Software AG
   3
   4   This file is part of SOPE.
   5
   6   SOPE is free software; you can redistribute it and/or modify it under
   7   the terms of the GNU Lesser General Public License as published by the
   8   Free Software Foundation; either version 2, or (at your option) any
   9   later version.
  10
  11   SOPE is distributed in the hope that it will be useful, but WITHOUT ANY
  12   WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13   FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
  14   License for more details.
  15
  16   You should have received a copy of the GNU Lesser General Public
  17   License along with SOPE; see the file COPYING.  If not, write to the
  18   Free Software Foundation, 59 Temple Place - Suite 330, Boston, MA
  19   02111-1307, USA.
  20 */
  21
  22 #include "iCalRecurrenceCalculator.h"
  23
  24 @interface iCalYearlyRecurrenceCalculator : iCalRecurrenceCalculator
  25 @end
  26
  27 #include <NGExtensions/NGCalendarDateRange.h>
  28 #include "iCalRecurrenceRule.h"
  29 #include "NSCalendarDate+ICal.h"
  30 #include "common.h"
  31
  32 @interface iCalRecurrenceCalculator(PrivateAPI)
  33 - (NSCalendarDate *)lastInstanceStartDate;
  34 @end
  35
  36 @implementation iCalYearlyRecurrenceCalculator
  37
  38 - (NSArray *)recurrenceRangesWithinCalendarDateRange:(NGCalendarDateRange *)_r{
  39   NSMutableArray *ranges;
  40   NSCalendarDate *firStart, *rStart, *rEnd, *until;
  41   unsigned       i, count, interval;
  42   int            diff;
  43
  44   firStart = [self->firstRange startDate];
  45   rStart   = [_r startDate];
  46   rEnd     = [_r endDate];
  47   interval = [self->rrule repeatInterval];
  48   until    = [self lastInstanceStartDate];
  49
  50   if (until) {
  51     if ([until compare:rStart] == NSOrderedAscending)
  52       return nil;
  53     if ([until compare:rEnd] == NSOrderedDescending)
  54       rEnd = until;
  55   }
  56
  57   diff   = [firStart yearsBetweenDate:rStart];
  58   if ((diff != 0) && [rStart compare:firStart] == NSOrderedAscending)
  59     diff = -diff;
  60
  61   count  = [rStart yearsBetweenDate:rEnd] + 1;
  62   ranges = [NSMutableArray arrayWithCapacity:count];
  63   for (i = 0 ; i < count; i++) {
  64     int test;
  65
  66     test = diff + i;
  67     if ((test >= 0) && (test % interval) == 0) {
  68       NSCalendarDate      *start, *end;
  69       NGCalendarDateRange *r;
  70
  71       start = [firStart dateByAddingYears:diff + i
  72                         months:0
  73                         days:0];
  74       [start setTimeZone:[firStart timeZone]];
  75       end   = [start addTimeInterval:[self->firstRange duration]];
  76       r     = [NGCalendarDateRange calendarDateRangeWithStartDate:start
  77                                    endDate:end];
  78       if ([_r containsDateRange:r])
  79         [ranges addObject:r];
  80     }
  81   }
  82   return ranges;
  83 }
  84
  85 - (NSCalendarDate *)lastInstanceStartDate {
  86   if ([self->rrule repeatCount] > 0) {
  87     NSCalendarDate *until;
  88     unsigned       years, interval;
  89
  90     interval = [self->rrule repeatInterval];
  91     years    = [self->rrule repeatCount] * interval;
  92     until    = [[self->firstRange startDate] dateByAddingYears:years
  93                                              months:0
  94                                              days:0];
  95     return until;
  96   }
  97   return [super lastInstanceStartDate];
  98 }
  99
 100 @end /* iCalYearlyRecurrenceCalculator */