543 lines
16 KiB
Objective-C
543 lines
16 KiB
Objective-C
/*
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Copyright (C) 2004-2005 SKYRIX Software AG
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Copyright (C) 2017 Inverse inc.
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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 <Foundation/NSTimeZone.h>
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#import <NGExtensions/NGCalendarDateRange.h>
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#import "NSCalendarDate+NGCards.h"
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#import "NSString+NGCards.h"
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#import "iCalDateTime.h"
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#import "iCalEvent.h"
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#import "iCalTimeZone.h"
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#import "iCalRecurrenceRule.h"
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#import "iCalRecurrenceCalculator.h"
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@implementation iCalRepeatableEntityObject
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- (Class) classForTag: (NSString *) classTag
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{
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Class tagClass;
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if ([classTag isEqualToString: @"RRULE"])
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tagClass = [iCalRecurrenceRule class];
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else if ([classTag isEqualToString: @"RDATE"])
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tagClass = [iCalDateTime class];
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else if ([classTag isEqualToString: @"EXDATE"])
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tagClass = [iCalDateTime class];
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else
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tagClass = [super classForTag: classTag];
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return tagClass;
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}
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/* Accessors */
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- (void) removeAllRecurrenceRules
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{
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[self removeChildren: [self recurrenceRules]];
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}
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- (void) addToRecurrenceRules: (id) _rrule
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{
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[self addChild: _rrule];
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}
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- (void) setRecurrenceRules: (NSArray *) _rrules
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{
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[children removeObjectsInArray: [self childrenWithTag: @"rrule"]];
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[self addChildren: _rrules];
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}
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- (BOOL) hasRecurrenceRules
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{
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return ([[self childrenWithTag: @"rrule"] count] > 0);
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}
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- (NSArray *) recurrenceRules
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{
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return [self childrenWithTag: @"rrule"];
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}
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- (NSArray *) recurrenceRulesWithTimeZone: (id) timezone
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{
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NSArray *rules;
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rules = [self recurrenceRules];
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return [self rules: rules withTimeZone: timezone];
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}
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- (void) removeAllRecurrenceDates
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{
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[self removeChildren: [self childrenWithTag: @"rdate"]];
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}
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- (void) addToRecurrenceDates: (NSCalendarDate *) _rdate
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{
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iCalDateTime *dateTime;
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dateTime = [iCalDateTime new];
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[dateTime setTag: @"rdate"];
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if ([self isKindOfClass: [iCalEvent class]] && [(iCalEvent *)self isAllDay])
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[dateTime setDate: _rdate];
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else
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[dateTime setDateTime: _rdate];
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[self addChild: dateTime];
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[dateTime release];
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}
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- (BOOL) hasRecurrenceDates
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{
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return ([[self childrenWithTag: @"rdate"] count] > 0);
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}
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/**
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* Returns the recurrence dates for the entity, but adjusted to the entity timezone.
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* @param theTimeZone the timezone of the entity.
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* @see [iCalTimeZone computedDatesForStrings:]
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* @return the exception dates, adjusted to the timezone.
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*/
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- (NSArray *) recurrenceDatesWithTimeZone: (id) theTimeZone
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{
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NSArray *dates, *rDates;
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NSEnumerator *dateList;
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NSCalendarDate *rDate;
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NSString *dateString;
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int offset;
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unsigned i;
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if (theTimeZone)
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{
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dates = [NSMutableArray array];
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dateList = [[self childrenWithTag: @"rdate"] objectEnumerator];
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while ((dateString = [dateList nextObject]))
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{
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rDates = [(iCalDateTime*) dateString dateTimes];
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for (i = 0; i < [rDates count]; i++)
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{
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rDate = [rDates objectAtIndex: i];
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// Example: timezone is -0400, date is 2012-05-24 (00:00:00 +0000),
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// and changes to 2012-05-24 04:00:00 +0000
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if ([theTimeZone isKindOfClass: [iCalTimeZone class]])
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{
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rDate = [(iCalTimeZone *) theTimeZone computedDateForDate: rDate];
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}
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else
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{
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offset = [(NSTimeZone *) theTimeZone secondsFromGMTForDate: rDate];
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rDate = (NSCalendarDate *) [rDate dateByAddingYears:0 months:0 days:0 hours:0 minutes:0
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seconds:-offset];
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}
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[(NSMutableArray *) dates addObject: rDate];
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}
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}
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}
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else
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dates = [self recurrenceDates];
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return dates;
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}
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/**
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* Return the recurrence dates of the entity in GMT.
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* @return an array of NSCalendarDate instances.
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*/
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- (NSArray *) recurrenceDates
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{
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NSArray *rDates;
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NSMutableArray *dates;
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NSEnumerator *dateList;
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NSCalendarDate *rDate;
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NSString *dateString;
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unsigned i;
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dates = [NSMutableArray array];
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dateList = [[self childrenWithTag: @"rdate"] objectEnumerator];
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while ((dateString = [dateList nextObject]))
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{
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rDates = [(iCalDateTime*) dateString dateTimes];
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for (i = 0; i < [rDates count]; i++)
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{
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rDate = [rDates objectAtIndex: i];
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[dates addObject: rDate];
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}
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}
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return dates;
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}
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- (void) removeAllExceptionRules
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{
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[self removeChildren: [self exceptionRules]];
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}
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- (void) addToExceptionRules: (id) _rrule
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{
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[self addChild: _rrule];
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}
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- (void) setExceptionRules: (NSArray *) _rrules
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{
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[children removeObjectsInArray: [self childrenWithTag: @"exrule"]];
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[self addChildren: _rrules];
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}
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- (BOOL) hasExceptionRules
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{
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return ([[self childrenWithTag: @"exrule"] count] > 0);
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}
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- (NSArray *) exceptionRules
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{
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return [self childrenWithTag: @"exrule"];
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}
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- (NSArray *) exceptionRulesWithTimeZone: (id) timezone
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{
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NSArray *rules;
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rules = [self exceptionRules];
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return [self rules: rules withTimeZone: timezone];
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}
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/**
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* Returns a new set of rules, but with "until dates" adjusted to the
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* specified timezone.
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* Used when calculating a recurrence/exception rule.
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* @param theRules the iCalRecurrenceRule instances
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* @param theTimeZone the timezone of the entity.
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* @see recurrenceRulesWithTimeZone:
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* @see exceptionRulesWithTimeZone:
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* @return a new array of iCalRecurrenceRule instances, adjusted for the timezone.
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*/
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- (NSArray *) rules: (NSArray *) theRules withTimeZone: (id) theTimeZone
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{
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NSArray *rules;
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NSCalendarDate *untilDate;
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NSMutableArray *fixedRules;
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iCalRecurrenceRule *currentRule;
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int offset;
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unsigned int max, count;
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rules = theRules;
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if (theTimeZone)
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{
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max = [rules count];
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if (max)
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{
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fixedRules = [NSMutableArray arrayWithCapacity: max];
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for (count = 0; count < max; count++)
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{
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currentRule = [rules objectAtIndex: count];
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untilDate = [currentRule untilDate];
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if (untilDate)
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{
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if ([theTimeZone isKindOfClass: [iCalTimeZone class]])
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untilDate = [(iCalTimeZone *) theTimeZone computedDateForDate: untilDate];
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else
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{
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offset = [(NSTimeZone *) theTimeZone secondsFromGMTForDate: untilDate];
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untilDate = (NSCalendarDate *) [untilDate dateByAddingYears:0 months:0 days:0 hours:0 minutes:0
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seconds:-offset];
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}
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}
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[fixedRules addObject: currentRule];
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}
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rules = fixedRules;
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}
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}
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return rules;
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}
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- (void) removeAllExceptionDates
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{
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[self removeChildren: [self childrenWithTag: @"exdate"]];
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}
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- (void) addToExceptionDates: (NSCalendarDate *) _rdate
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{
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iCalDateTime *dateTime;
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dateTime = [iCalDateTime new];
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[dateTime setTag: @"exdate"];
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if ([self isKindOfClass: [iCalEvent class]] && [(iCalEvent *)self isAllDay])
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[dateTime setDate: _rdate];
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else
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[dateTime setDateTime: _rdate];
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[self addChild: dateTime];
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[dateTime release];
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}
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//- (void) setExceptionDates: (NSArray *) _rdates
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//{
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// [children removeObjectsInArray: [self childrenWithTag: @"exdate"]];
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// [self addChildren: _rdates];
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//}
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- (BOOL) hasExceptionDates
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{
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return ([[self childrenWithTag: @"exdate"] count] > 0);
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}
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/**
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* Return the exception dates of the entity in GMT.
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* @return an array of strings.
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*/
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- (NSArray *) exceptionDates
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{
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NSArray *exDates;
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NSMutableArray *dates;
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NSEnumerator *dateList;
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NSCalendarDate *exDate;
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NSString *dateString;
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unsigned i;
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dates = [NSMutableArray array];
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dateList = [[self childrenWithTag: @"exdate"] objectEnumerator];
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while ((dateString = [dateList nextObject]))
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{
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exDates = [(iCalDateTime*) dateString dateTimes];
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for (i = 0; i < [exDates count]; i++)
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{
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exDate = [exDates objectAtIndex: i];
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dateString = [NSString stringWithFormat: @"%@Z",
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[exDate iCalFormattedDateTimeString]];
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[dates addObject: dateString];
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}
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}
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return dates;
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}
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/**
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* Returns the exception dates for the entity, but adjusted to the entity timezone.
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* Used when calculating a recurrence rule.
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* @param theTimeZone the timezone of the entity.
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* @see [iCalTimeZone computedDatesForStrings:]
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* @return the exception dates, adjusted to the timezone.
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*/
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- (NSArray *) exceptionDatesWithTimeZone: (id) theTimeZone
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{
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NSArray *dates, *exDates;
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NSEnumerator *dateList;
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NSCalendarDate *exDate;
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NSString *dateString;
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int offset;
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unsigned i;
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if (theTimeZone)
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{
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dates = [NSMutableArray array];
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dateList = [[self childrenWithTag: @"exdate"] objectEnumerator];
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while ((dateString = [dateList nextObject]))
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{
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exDates = [(iCalDateTime*) dateString dateTimes];
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for (i = 0; i < [exDates count]; i++)
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{
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exDate = [exDates objectAtIndex: i];
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// Example: timezone is -0400, date is 2012-05-24 (00:00:00 +0000),
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// and changes to 2012-05-24 04:00:00 +0000
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if ([theTimeZone isKindOfClass: [iCalTimeZone class]])
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{
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exDate = [(iCalTimeZone *) theTimeZone computedDateForDate: exDate];
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}
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else
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{
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offset = [(NSTimeZone *) theTimeZone secondsFromGMTForDate: exDate];
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exDate = (NSCalendarDate *) [exDate dateByAddingYears:0 months:0 days:0 hours:0 minutes:0
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seconds:-offset];
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}
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[(NSMutableArray *) dates addObject: exDate];
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}
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}
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}
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else
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dates = [self exceptionDates];
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return dates;
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}
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/* Convenience */
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- (BOOL) isRecurrent
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{
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return [self hasRecurrenceRules] || [self hasRecurrenceDates];
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}
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/* Matching */
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- (BOOL) isWithinCalendarDateRange: (NGCalendarDateRange *) _range
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firstInstanceCalendarDateRange: (NGCalendarDateRange *) _fir
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{
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NSArray *ranges;
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ranges = [self recurrenceRangesWithinCalendarDateRange:_range
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firstInstanceCalendarDateRange:_fir];
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return [ranges count] > 0;
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}
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- (NSArray *) recurrenceRangesWithinCalendarDateRange: (NGCalendarDateRange *)_r
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firstInstanceCalendarDateRange: (NGCalendarDateRange *)_fir
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{
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return [iCalRecurrenceCalculator recurrenceRangesWithinCalendarDateRange: _r
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firstInstanceCalendarDateRange: _fir
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recurrenceRules: [self recurrenceRules]
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exceptionRules: [self exceptionRules]
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recurrenceDates: [self recurrenceDates]
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exceptionDates: [self exceptionDates]];
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}
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/* this is the outmost bound possible, not necessarily the real last date */
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- (NSCalendarDate *)
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lastPossibleRecurrenceStartDateUsingFirstInstanceCalendarDateRange: (NGCalendarDateRange *)_r
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{
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NSCalendarDate *date;
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NSCalendarDate *rdate;
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date = nil;
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if ([self hasRecurrenceRules])
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{
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NSEnumerator *rRules;
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iCalRecurrenceRule *rule;
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iCalRecurrenceCalculator *calc;
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rRules = [[self recurrenceRules] objectEnumerator];
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rule = [rRules nextObject];
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while (rule && ![rule isInfinite] && !date)
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{
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calc = [iCalRecurrenceCalculator
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recurrenceCalculatorForRecurrenceRule: rule
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withFirstInstanceCalendarDateRange: _r];
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rdate = [[calc lastInstanceCalendarDateRange] startDate];
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if (!rdate)
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date = [_r startDate];
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else if (!date || ([date compare: rdate] == NSOrderedAscending))
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date = rdate;
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else
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rule = [rRules nextObject];
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}
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}
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if ([self hasRecurrenceDates])
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{
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NSEnumerator *rDates;
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rDates = [[self recurrenceDates] objectEnumerator];
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while ((rdate = [rDates nextObject]))
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{
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if (!date || ([date compare: rdate] == NSOrderedAscending))
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date = rdate;
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}
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}
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return date;
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}
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- (NSCalendarDate *) firstRecurrenceStartDateWithEndDate: (NSCalendarDate *) endDate
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{
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NSCalendarDate *startDate, *firstOccurrenceStartDate, *endOfFirstRange;
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NGCalendarDateRange *range, *firstInstanceRange;
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iCalRecurrenceFrequency frequency;
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iCalRecurrenceRule *rule;
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NSArray *rules, *recurrences;
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uint32_t units;
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firstOccurrenceStartDate = nil;
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rules = [self recurrenceRules];
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if ([rules count] > 0)
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{
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rule = [rules objectAtIndex: 0];
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frequency = [rule frequency];
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units = [rule repeatInterval];
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startDate = [self startDate];
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switch (frequency)
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{
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/* second-based units */
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case iCalRecurrenceFrequenceWeekly:
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units *= 7;
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case iCalRecurrenceFrequenceDaily:
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units *= 24;
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case iCalRecurrenceFrequenceHourly:
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units *= 60;
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case iCalRecurrenceFrequenceMinutely:
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units *= 60;
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case iCalRecurrenceFrequenceSecondly:
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endOfFirstRange = [startDate dateByAddingYears: 0 months: 0 days: 0
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hours: 0 minutes: 0
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seconds: units];
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break;
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/* month-based units */
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case iCalRecurrenceFrequenceYearly:
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units *= 12;
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case iCalRecurrenceFrequenceMonthly:
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endOfFirstRange = [startDate dateByAddingYears: 0 months: (units + 1)
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days: 0
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hours: 0 minutes: 0
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seconds: 0];
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break;
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default:
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endOfFirstRange = nil;
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}
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if (endOfFirstRange)
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{
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range = [NGCalendarDateRange calendarDateRangeWithStartDate: startDate
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endDate: endOfFirstRange];
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firstInstanceRange = [NGCalendarDateRange calendarDateRangeWithStartDate: startDate
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endDate: endDate];
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recurrences = [iCalRecurrenceCalculator recurrenceRangesWithinCalendarDateRange: range
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firstInstanceCalendarDateRange: firstInstanceRange
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recurrenceRules: rules
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exceptionRules: nil
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recurrenceDates: nil
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exceptionDates: nil];
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if ([recurrences count] > 0)
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firstOccurrenceStartDate = [[recurrences objectAtIndex: 0]
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startDate];
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}
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}
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return firstOccurrenceStartDate;
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}
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- (NSCalendarDate *) lastPossibleRecurrenceStartDate
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{
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[self subclassResponsibility: _cmd];
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return nil;
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}
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@end
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