err.no Git - scalable-opengroupware.org/blob - SOPE/NGCards/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 #import <NGExtensions/NSCalendarDate+misc.h>
  23
  24 #import "iCalRecurrenceCalculator.h"
  25
  26 @interface iCalYearlyRecurrenceCalculator : iCalRecurrenceCalculator
  27 @end
  28
  29 #import <NGExtensions/NGCalendarDateRange.h>
  30 #import "iCalRecurrenceRule.h"
  31 #import "NSCalendarDate+ICal.h"
  32
  33 @interface iCalRecurrenceCalculator(PrivateAPI)
  34 - (NSCalendarDate *)lastInstanceStartDate;
  35 @end
  36
  37 @implementation iCalYearlyRecurrenceCalculator
  38
  39 - (NSArray *)recurrenceRangesWithinCalendarDateRange:(NGCalendarDateRange *)_r{
  40   NSMutableArray *ranges;
  41   NSCalendarDate *firStart, *rStart, *rEnd, *until;
  42   unsigned       i, count, interval;
  43   int            diff;
  44
  45   firStart = [self->firstRange startDate];
  46   rStart   = [_r startDate];
  47   rEnd     = [_r endDate];
  48   interval = [self->rrule repeatInterval];
  49   until    = [self lastInstanceStartDate];
  50
  51   if (until) {
  52     if ([until compare:rStart] == NSOrderedAscending)
  53       return nil;
  54     if ([until compare:rEnd] == NSOrderedDescending)
  55       rEnd = until;
  56   }
  57
  58   diff   = [firStart yearsBetweenDate:rStart];
  59   if ((diff != 0) && [rStart compare:firStart] == NSOrderedAscending)
  60     diff = -diff;
  61
  62   count  = [rStart yearsBetweenDate:rEnd] + 1;
  63   ranges = [NSMutableArray arrayWithCapacity:count];
  64   for (i = 0 ; i < count; i++) {
  65     int test;
  66
  67     test = diff + i;
  68     if ((test >= 0) && (test % interval) == 0) {
  69       NSCalendarDate      *start, *end;
  70       NGCalendarDateRange *r;
  71
  72       start = [firStart dateByAddingYears:diff + i
  73                         months:0
  74                         days:0];
  75       [start setTimeZone:[firStart timeZone]];
  76       end   = [start addTimeInterval:[self->firstRange duration]];
  77       r     = [NGCalendarDateRange calendarDateRangeWithStartDate:start
  78                                    endDate:end];
  79       if ([_r containsDateRange:r])
  80         [ranges addObject:r];
  81     }
  82   }
  83   return ranges;
  84 }
  85
  86 - (NSCalendarDate *)lastInstanceStartDate {
  87   if ([self->rrule repeatCount] > 0) {
  88     NSCalendarDate *until;
  89     unsigned       years, interval;
  90
  91     interval = [self->rrule repeatInterval];
  92     years    = [self->rrule repeatCount] * interval;
  93     until    = [[self->firstRange startDate] dateByAddingYears:years
  94                                              months:0
  95                                              days:0];
  96     return until;
  97   }
  98   return [super lastInstanceStartDate];
  99 }
 100
 101 @end /* iCalYearlyRecurrenceCalculator */