366 lines
11 KiB
Objective-C
366 lines
11 KiB
Objective-C
/* iCalTimeZone.m - this file is part of SOPE
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*
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* Copyright (C) 2006-2014 Inverse inc.
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*
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* This file is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* This file is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; see the file COPYING. If not, write to
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* the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#import <Foundation/NSArray.h>
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#import <Foundation/NSBundle.h>
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#import <Foundation/NSCalendarDate.h>
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#import <Foundation/NSData.h>
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#import <Foundation/NSDictionary.h>
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#import <Foundation/NSFileManager.h>
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#import <Foundation/NSPathUtilities.h>
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#import <Foundation/NSString.h>
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#import <Foundation/NSTimeZone.h>
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#import "NSCalendarDate+NGCards.h"
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#import "NSString+NGCards.h"
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#import "iCalCalendar.h"
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#import "iCalTimeZonePeriod.h"
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#import "iCalTimeZone.h"
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static NSMutableDictionary *cache;
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static NSArray *knownTimeZones;
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@implementation iCalTimeZone
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+ (void) initialize
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{
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cache = [[NSMutableDictionary alloc] init];
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knownTimeZones = nil;
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}
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+ (iCalTimeZone *) timeZoneForName: (NSString *) theName
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{
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iCalTimeZone *o;
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o = [cache objectForKey: theName];
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if (!o)
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{
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NSFileManager *fm;
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NSEnumerator *e;
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NSArray *paths;
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NSString *path;
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BOOL b;
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paths = NSSearchPathForDirectoriesInDomains(NSAllLibrariesDirectory,
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NSAllDomainsMask,
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YES);
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fm = [NSFileManager defaultManager];
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if ([paths count] > 0)
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{
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e = [paths objectEnumerator];
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while ((path = [e nextObject]))
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{
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path = [NSString stringWithFormat: @"%@/Libraries/Resources/NGCards/TimeZones", path];
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if ([fm fileExistsAtPath: path isDirectory: &b] && b)
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{
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iCalCalendar *calendar;
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NSString *s;
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NSData *d;
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s = [NSString stringWithFormat: @"%@/%@.ics", path, theName];
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d = [NSData dataWithContentsOfFile: s];
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s = [[NSString alloc] initWithData: d
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encoding: NSUTF8StringEncoding];
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AUTORELEASE(s);
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calendar = [iCalCalendar parseSingleFromSource: s];
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o = [[calendar timezones] lastObject];
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if (o)
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[cache setObject: o forKey: theName];
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return o;
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}
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}
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}
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}
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return o;
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}
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/**
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* Fetch the names of the available timezones for which we have a
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* vTimeZone definition (.ics).
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* @return an array of timezones names.
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* @see [NSTimeZone knownTimeZoneNames]
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*/
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+ (NSArray *) knownTimeZoneNames
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{
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NSFileManager *fm;
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NSEnumerator *e;
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NSDirectoryEnumerator *zones;
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NSArray *paths;
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NSMutableArray *timeZoneNames;
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NSString *path, *zone, *zonePath;
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NSRange ext;
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BOOL b;
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if (!knownTimeZones)
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{
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timeZoneNames = [NSMutableArray new];
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paths = NSSearchPathForDirectoriesInDomains(NSAllLibrariesDirectory,
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NSAllDomainsMask,
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YES);
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fm = [NSFileManager defaultManager];
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if ([paths count] > 0)
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{
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e = [paths objectEnumerator];
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while ((path = [e nextObject]))
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{
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path = [NSString stringWithFormat: @"%@/Libraries/Resources/NGCards/TimeZones", path];
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if ([fm fileExistsAtPath: path isDirectory: &b] && b)
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{
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zones = [fm enumeratorAtPath: path];
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while ((zone = [zones nextObject])) {
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zonePath = [NSString stringWithFormat: @"%@/%@", path, zone];
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if ([fm fileExistsAtPath: zonePath isDirectory: &b] && !b)
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{
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ext = [zone rangeOfString: @".ics"];
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if (ext.location != NSNotFound)
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{
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zone = [zone substringToIndex: ext.location];
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[timeZoneNames addObject: zone];
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}
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}
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}
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}
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}
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}
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knownTimeZones = [NSArray arrayWithArray: timeZoneNames];
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[knownTimeZones retain];
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}
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return knownTimeZones;
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}
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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: @"STANDARD"]
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|| [classTag isEqualToString: @"DAYLIGHT"])
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tagClass = [iCalTimeZonePeriod class];
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else if ([classTag isEqualToString: @"TZID"])
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tagClass = [CardElement 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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- (void) setTzId: (NSString *) tzId
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{
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[[self uniqueChildWithTag: @"tzid"] setSingleValue: tzId forKey: @""];
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}
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- (NSString *) tzId
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{
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return [[self uniqueChildWithTag: @"tzid"] flattenedValuesForKey: @""];
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}
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- (NSDictionary *) _occurrenceForPeriodNamed: (NSString *) pName
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forDate: (NSCalendarDate *) aDate
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{
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NSArray *periods;
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NSEnumerator *periodsList;
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iCalTimeZonePeriod *period;
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NSCalendarDate *occurrence;
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NSDictionary *periodDict;
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occurrence = nil;
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periodDict = nil;
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periods = [[self childrenWithTag: pName]
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sortedArrayUsingSelector: @selector (compare:)];
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periodsList = [periods reverseObjectEnumerator];
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while ((period = (iCalTimeZonePeriod *) [periodsList nextObject]))
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{
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if ([periods count] > 1 && ([[period startDate] yearOfCommonEra] > [aDate yearOfCommonEra]))
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continue;
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occurrence = [period occurrenceForDate: aDate];
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if (occurrence && (!periodDict || [occurrence earlierDate: [periodDict objectForKey: @"occurrence"]] == [periodDict objectForKey: @"occurrence"]))
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{
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periodDict = [NSDictionary dictionaryWithObjectsAndKeys:
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period, @"period",
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occurrence, @"occurrence",nil];
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occurrence = nil;
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}
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}
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return periodDict;
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}
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- (iCalTimeZonePeriod *) periodForDate: (NSCalendarDate *) date
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{
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//NSCalendarDate *daylightOccurence, *standardOccurence;
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NSDictionary *daylightOccurence, *standardOccurence;
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iCalTimeZonePeriod *period;
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/* FIXME, this could cause crashes when timezones are not properly
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specified, but let's say it won't happen often... */
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daylightOccurence = [self _occurrenceForPeriodNamed: @"daylight"
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forDate: date];
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standardOccurence = [self _occurrenceForPeriodNamed: @"standard"
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forDate: date];
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if (!standardOccurence && !daylightOccurence)
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period = (iCalTimeZonePeriod *) [self uniqueChildWithTag: @"standard"];
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else if (!standardOccurence)
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period = (iCalTimeZonePeriod *) [self uniqueChildWithTag: @"daylight"];
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else if (!daylightOccurence)
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period = (iCalTimeZonePeriod *) [self uniqueChildWithTag: @"standard"];
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else if ([date earlierDate: [daylightOccurence objectForKey: @"occurrence"]] == date)
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{
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if ([date earlierDate: [standardOccurence objectForKey: @"occurrence"]] == date
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&& ([[standardOccurence objectForKey: @"occurrence"] earlierDate: [daylightOccurence objectForKey: @"occurrence"]]
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== [standardOccurence objectForKey: @"occurrence"]))
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period = (iCalTimeZonePeriod *) [daylightOccurence objectForKey: @"period"];
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else
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period = (iCalTimeZonePeriod *) [standardOccurence objectForKey: @"period"];
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}
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else
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{
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if ([[standardOccurence objectForKey: @"occurrence"] earlierDate: date] == [standardOccurence objectForKey: @"occurrence"]
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&& ([[daylightOccurence objectForKey: @"occurrence"] earlierDate: [standardOccurence objectForKey: @"occurrence"]]
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== [daylightOccurence objectForKey: @"occurrence"] ))
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period = (iCalTimeZonePeriod *) [standardOccurence objectForKey: @"period"];
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else
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period = (iCalTimeZonePeriod *) [daylightOccurence objectForKey: @"period"];
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}
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return period;
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}
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/**
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* Adjust a date with respect to this vTimeZone.
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* @param theDate the date to adjust to the timezone.
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* @return a new GMT date adjusted with the offset of the timezone.
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*/
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- (NSCalendarDate *) computedDateForDate: (NSCalendarDate *) theDate
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{
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NSCalendarDate *tmpDate;
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NSTimeZone *utc;
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utc = [NSTimeZone timeZoneWithName: @"GMT"];
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tmpDate = [theDate copy];
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[tmpDate autorelease];
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[tmpDate setTimeZone: utc];
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return [tmpDate addYear: 0 month: 0 day: 0
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hour: 0 minute: 0
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second: [[self periodForDate: theDate] secondsOffsetFromGMT]];
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}
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/**
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* Adjust a date with respect to this vTimeZone.
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* Example: Timezone is -0400, the date is 2012-05-23 13:00:00 +0000:
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* it returns 2012-05-23 09:00:00 +0000
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* @param theDate the string representing a date.
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* @return a new GMT date adjusted with the offset of this timezone.
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*/
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- (NSCalendarDate *) computedDateForString: (NSString *) theDate
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{
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NSCalendarDate *tmpDate;
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NSTimeZone *utc;
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utc = [NSTimeZone timeZoneWithName: @"GMT"];
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tmpDate = [theDate asCalendarDate];
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[tmpDate setTimeZone: utc];
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return [tmpDate addYear: 0 month: 0 day: 0
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hour: 0 minute: 0
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second: [[self periodForDate: tmpDate] secondsOffsetFromGMT]];
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}
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/**
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* Adjust multiple dates with respect to this vTimeZone.
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* @param theDates an array of strings representing dates.
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* @param an array of NSCalendarDate objects.
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*/
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- (NSMutableArray *) computedDatesForStrings: (NSArray *) theDates
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{
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NSCalendarDate *date;
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NSMutableArray *dates;
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NSEnumerator *dateList;
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NSString *dateString;
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dates = [NSMutableArray array];
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dateList = [theDates objectEnumerator];
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while ((dateString = [dateList nextObject]))
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{
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date = [self computedDateForString: dateString];
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[dates addObject: date];
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}
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return dates;
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}
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- (NSString *) dateTimeStringForDate: (NSCalendarDate *) date
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{
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return [[self computedDateForDate: date]
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iCalFormattedDateTimeString];
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}
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- (NSString *) dateStringForDate: (NSCalendarDate *) date
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{
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return [[self computedDateForDate: date]
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iCalFormattedDateString];
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}
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- (NSCalendarDate *) dateForDateTimeString: (NSString *) string
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{
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NSCalendarDate *tmpDate;
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iCalTimeZonePeriod *period, *realPeriod;
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tmpDate = [string asCalendarDate];
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period = [self periodForDate: tmpDate];
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tmpDate = [tmpDate addYear: 0 month: 0 day: 0
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hour: 0 minute: 0
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second: -[period secondsOffsetFromGMT]];
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#warning this is a dirty hack due to the fact that the date is first passed as UTC
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realPeriod = [self periodForDate: tmpDate];
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if (realPeriod != period)
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tmpDate = [tmpDate addYear: 0 month: 0 day: 0
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hour: 0 minute: 0
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second: ([period secondsOffsetFromGMT]
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- [realPeriod secondsOffsetFromGMT])];
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return tmpDate;
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}
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@end
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