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GTLDateTime.m
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GTLDateTime.m
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/* Copyright (c) 2011 Google Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
//
// GTLDateTime.m
//
#import "GTLDateTime.h"
@interface GTLDateTime ()
- (void)setFromDate:(NSDate *)date timeZone:(NSTimeZone *)tz;
- (void)setFromRFC3339String:(NSString *)str;
@property (nonatomic, retain, readwrite) NSTimeZone *timeZone;
@property (nonatomic, copy, readwrite) NSDateComponents *dateComponents;
@property (nonatomic, assign, readwrite) NSInteger milliseconds;
@property (nonatomic, assign, readwrite) BOOL hasTime;
@property (nonatomic, assign, readwrite) NSInteger offsetSeconds;
@property (nonatomic, assign, getter=isUniversalTime, readwrite) BOOL universalTime;
@end
static NSCharacterSet *gDashSet = nil;
static NSCharacterSet *gTSet = nil;
static NSCharacterSet *gColonSet = nil;
static NSCharacterSet *gPlusMinusZSet = nil;
static NSMutableDictionary *gCalendarsForTimeZones = nil;
@implementation GTLDateTime
// A note about milliseconds_:
// RFC 3339 has support for fractions of a second. NSDateComponents is all
// NSInteger based, so it can't handle a fraction of a second. NSDate is
// built on NSTimeInterval so it has sub-millisecond precision. GTL takes
// the compromise of supporting the RFC's optional fractional second support
// by maintaining a number of milliseconds past what fits in the
// NSDateComponents. The parsing and string conversions will include
// 3 decimal digits (hence milliseconds). When going to a string, the decimal
// digits are only included if the milliseconds are non zero.
@dynamic date;
@dynamic calendar;
@dynamic RFC3339String;
@dynamic stringValue;
@dynamic timeZone;
@dynamic hasTime;
@synthesize dateComponents = dateComponents_,
milliseconds = milliseconds_,
offsetSeconds = offsetSeconds_,
universalTime = isUniversalTime_;
+ (void)initialize {
// Note that initialize is guaranteed by the runtime to be called in a
// thread-safe manner.
if (gDashSet == nil) {
gDashSet = [[NSCharacterSet characterSetWithCharactersInString:@"-"] retain];
gTSet = [[NSCharacterSet characterSetWithCharactersInString:@"Tt "] retain];
gColonSet = [[NSCharacterSet characterSetWithCharactersInString:@":"] retain];
gPlusMinusZSet = [[NSCharacterSet characterSetWithCharactersInString:@"+-zZ"] retain];
gCalendarsForTimeZones = [[NSMutableDictionary alloc] init];
}
}
+ (GTLDateTime *)dateTimeWithRFC3339String:(NSString *)str {
if (str == nil) return nil;
GTLDateTime *result = [[[self alloc] init] autorelease];
[result setFromRFC3339String:str];
return result;
}
+ (GTLDateTime *)dateTimeWithDate:(NSDate *)date timeZone:(NSTimeZone *)tz {
if (date == nil) return nil;
GTLDateTime *result = [[[self alloc] init] autorelease];
[result setFromDate:date timeZone:tz];
return result;
}
+ (GTLDateTime *)dateTimeForAllDayWithDate:(NSDate *)date {
if (date == nil) return nil;
GTLDateTime *result = [[[self alloc] init] autorelease];
[result setFromDate:date timeZone:nil];
result.hasTime = NO;
return result;
}
+ (GTLDateTime *)dateTimeWithDateComponents:(NSDateComponents *)components {
NSCalendar *cal = [[[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar] autorelease];
NSDate *date = [cal dateFromComponents:components];
#if GTL_IPHONE
NSTimeZone *tz = [components timeZone];
#else
// NSDateComponents added timeZone: in Mac OS X 10.7.
NSTimeZone *tz = nil;
if ([components respondsToSelector:@selector(timeZone)]) {
tz = [components timeZone];
}
#endif
return [self dateTimeWithDate:date timeZone:tz];
}
- (void)dealloc {
[dateComponents_ release];
[timeZone_ release];
[super dealloc];
}
- (id)copyWithZone:(NSZone *)zone {
// Object is immutable
return [self retain];
}
// until NSDateComponent implements isEqual, we'll use this
- (BOOL)doesDateComponents:(NSDateComponents *)dc1
equalDateComponents:(NSDateComponents *)dc2 {
return [dc1 era] == [dc2 era]
&& [dc1 year] == [dc2 year]
&& [dc1 month] == [dc2 month]
&& [dc1 day] == [dc2 day]
&& [dc1 hour] == [dc2 hour]
&& [dc1 minute] == [dc2 minute]
&& [dc1 second] == [dc2 second]
&& [dc1 week] == [dc2 week]
&& [dc1 weekday] == [dc2 weekday]
&& [dc1 weekdayOrdinal] == [dc2 weekdayOrdinal];
}
- (BOOL)isEqual:(GTLDateTime *)other {
if (self == other) return YES;
if (![other isKindOfClass:[GTLDateTime class]]) return NO;
BOOL areDateComponentsEqual = [self doesDateComponents:self.dateComponents
equalDateComponents:other.dateComponents];
NSTimeZone *tz1 = self.timeZone;
NSTimeZone *tz2 = other.timeZone;
BOOL areTimeZonesEqual = (tz1 == tz2 || (tz2 && [tz1 isEqual:tz2]));
return self.offsetSeconds == other.offsetSeconds
&& self.isUniversalTime == other.isUniversalTime
&& self.milliseconds == other.milliseconds
&& areDateComponentsEqual
&& areTimeZonesEqual;
}
- (NSString *)description {
return [NSString stringWithFormat:@"%@ %p: {%@}",
[self class], self, self.RFC3339String];
}
- (NSTimeZone *)timeZone {
if (timeZone_) {
return timeZone_;
}
if (self.isUniversalTime) {
NSTimeZone *ztz = [NSTimeZone timeZoneWithName:@"Universal"];
return ztz;
}
NSInteger offsetSeconds = self.offsetSeconds;
if (offsetSeconds != NSUndefinedDateComponent) {
NSTimeZone *tz = [NSTimeZone timeZoneForSecondsFromGMT:offsetSeconds];
return tz;
}
return nil;
}
- (void)setTimeZone:(NSTimeZone *)timeZone {
[timeZone_ release];
timeZone_ = [timeZone retain];
if (timeZone) {
NSInteger offsetSeconds = [timeZone secondsFromGMTForDate:self.date];
self.offsetSeconds = offsetSeconds;
} else {
self.offsetSeconds = NSUndefinedDateComponent;
}
}
- (NSCalendar *)calendarForTimeZone:(NSTimeZone *)tz {
NSCalendar *cal = nil;
@synchronized(gCalendarsForTimeZones) {
id tzKey = (tz ? tz : [NSNull null]);
cal = [gCalendarsForTimeZones objectForKey:tzKey];
if (cal == nil) {
cal = [[[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar] autorelease];
if (tz) {
[cal setTimeZone:tz];
}
[gCalendarsForTimeZones setObject:cal forKey:tzKey];
}
}
return cal;
}
- (NSCalendar *)calendar {
NSTimeZone *tz = self.timeZone;
return [self calendarForTimeZone:tz];
}
- (NSDate *)date {
NSDateComponents *dateComponents = self.dateComponents;
NSTimeInterval extraMillisecondsAsSeconds = 0.0;
NSCalendar *cal;
if (!self.hasTime) {
// We're not keeping track of a time, but NSDate always is based on
// an absolute time. We want to avoid returning an NSDate where the
// calendar date appears different from what was used to create our
// date-time object.
//
// We'll make a copy of the date components, setting the time on our
// copy to noon GMT, since that ensures the date renders correctly for
// any time zone.
NSDateComponents *noonDateComponents = [[dateComponents copy] autorelease];
[noonDateComponents setHour:12];
[noonDateComponents setMinute:0];
[noonDateComponents setSecond:0];
dateComponents = noonDateComponents;
NSTimeZone *gmt = [NSTimeZone timeZoneWithName:@"Universal"];
cal = [self calendarForTimeZone:gmt];
} else {
cal = self.calendar;
// Add in the fractional seconds that don't fit into NSDateComponents.
extraMillisecondsAsSeconds = ((NSTimeInterval)self.milliseconds) / 1000.0;
}
NSDate *date = [cal dateFromComponents:dateComponents];
// Add in any milliseconds that didn't fit into the dateComponents.
if (extraMillisecondsAsSeconds > 0.0) {
#if GTL_IPHONE || (MAC_OS_X_VERSION_MIN_REQUIRED > MAC_OS_X_VERSION_10_5)
date = [date dateByAddingTimeInterval:extraMillisecondsAsSeconds];
#else
date = [date addTimeInterval:extraMillisecondsAsSeconds];
#endif
}
return date;
}
- (NSString *)stringValue {
return self.RFC3339String;
}
- (NSString *)RFC3339String {
NSDateComponents *dateComponents = self.dateComponents;
NSInteger offset = self.offsetSeconds;
NSString *timeString = @""; // timeString like "T15:10:46-08:00"
if (self.hasTime) {
NSString *timeOffsetString; // timeOffsetString like "-08:00"
if (self.isUniversalTime) {
timeOffsetString = @"Z";
} else if (offset == NSUndefinedDateComponent) {
// unknown offset is rendered as -00:00 per
// http://www.ietf.org/rfc/rfc3339.txt section 4.3
timeOffsetString = @"-00:00";
} else {
NSString *sign = @"+";
if (offset < 0) {
sign = @"-";
offset = -offset;
}
timeOffsetString = [NSString stringWithFormat:@"%@%02ld:%02ld",
sign, (long)(offset/(60*60)) % 24, (long)(offset / 60) % 60];
}
NSString *fractionalSecondsString = @"";
if (self.milliseconds > 0.0) {
fractionalSecondsString = [NSString stringWithFormat:@".%03ld", (long)self.milliseconds];
}
timeString = [NSString stringWithFormat:@"T%02ld:%02ld:%02ld%@%@",
(long)[dateComponents hour], (long)[dateComponents minute],
(long)[dateComponents second], fractionalSecondsString, timeOffsetString];
}
// full dateString like "2006-11-17T15:10:46-08:00"
NSString *dateString = [NSString stringWithFormat:@"%04ld-%02ld-%02ld%@",
(long)[dateComponents year], (long)[dateComponents month],
(long)[dateComponents day], timeString];
return dateString;
}
- (void)setFromDate:(NSDate *)date timeZone:(NSTimeZone *)tz {
NSCalendar *cal = [self calendarForTimeZone:tz];
NSUInteger const kComponentBits = (NSYearCalendarUnit | NSMonthCalendarUnit
| NSDayCalendarUnit | NSHourCalendarUnit | NSMinuteCalendarUnit
| NSSecondCalendarUnit);
NSDateComponents *components = [cal components:kComponentBits fromDate:date];
self.dateComponents = components;
// Extract the fractional seconds.
NSTimeInterval asTimeInterval = [date timeIntervalSince1970];
NSTimeInterval worker = asTimeInterval - trunc(asTimeInterval);
self.milliseconds = (NSInteger)round(worker * 1000.0);
self.universalTime = NO;
NSInteger offset = NSUndefinedDateComponent;
if (tz) {
offset = [tz secondsFromGMTForDate:date];
if (offset == 0 && [tz isEqualToTimeZone:[NSTimeZone timeZoneWithName:@"Universal"]]) {
self.universalTime = YES;
}
}
self.offsetSeconds = offset;
// though offset seconds are authoritative, we'll retain the time zone
// since we can't regenerate it reliably from just the offset
timeZone_ = [tz retain];
}
- (void)setFromRFC3339String:(NSString *)str {
NSInteger year = NSUndefinedDateComponent;
NSInteger month = NSUndefinedDateComponent;
NSInteger day = NSUndefinedDateComponent;
NSInteger hour = NSUndefinedDateComponent;
NSInteger minute = NSUndefinedDateComponent;
NSInteger sec = NSUndefinedDateComponent;
NSInteger milliseconds = 0;
double secDouble = -1.0;
NSString* sign = nil;
NSInteger offsetHour = 0;
NSInteger offsetMinute = 0;
if ([str length] > 0) {
NSScanner* scanner = [NSScanner scannerWithString:str];
// There should be no whitespace, so no skip characters.
[scanner setCharactersToBeSkipped:nil];
// for example, scan 2006-11-17T15:10:46-08:00
// or 2006-11-17T15:10:46Z
if (// yyyy-mm-dd
[scanner scanInteger:&year] &&
[scanner scanCharactersFromSet:gDashSet intoString:NULL] &&
[scanner scanInteger:&month] &&
[scanner scanCharactersFromSet:gDashSet intoString:NULL] &&
[scanner scanInteger:&day] &&
// Thh:mm:ss
[scanner scanCharactersFromSet:gTSet intoString:NULL] &&
[scanner scanInteger:&hour] &&
[scanner scanCharactersFromSet:gColonSet intoString:NULL] &&
[scanner scanInteger:&minute] &&
[scanner scanCharactersFromSet:gColonSet intoString:NULL] &&
[scanner scanDouble:&secDouble]) {
// At this point we got secDouble, pull it apart.
sec = (NSInteger)secDouble;
double worker = secDouble - ((double)sec);
milliseconds = (NSInteger)round(worker * 1000.0);
// Finish parsing, now the offset info.
if (// Z or +hh:mm
[scanner scanCharactersFromSet:gPlusMinusZSet intoString:&sign] &&
[scanner scanInteger:&offsetHour] &&
[scanner scanCharactersFromSet:gColonSet intoString:NULL] &&
[scanner scanInteger:&offsetMinute]) {
}
}
}
NSDateComponents *dateComponents = [[[NSDateComponents alloc] init] autorelease];
[dateComponents setYear:year];
[dateComponents setMonth:month];
[dateComponents setDay:day];
[dateComponents setHour:hour];
[dateComponents setMinute:minute];
[dateComponents setSecond:sec];
self.dateComponents = dateComponents;
self.milliseconds = milliseconds;
// determine the offset, like from Z, or -08:00:00.0
self.timeZone = nil;
NSInteger totalOffset = NSUndefinedDateComponent;
self.universalTime = NO;
if ([sign caseInsensitiveCompare:@"Z"] == NSOrderedSame) {
self.universalTime = YES;
totalOffset = 0;
} else if (sign != nil) {
totalOffset = (60 * offsetMinute) + (60 * 60 * offsetHour);
if ([sign isEqual:@"-"]) {
if (totalOffset == 0) {
// special case: offset of -0.00 means undefined offset
totalOffset = NSUndefinedDateComponent;
} else {
totalOffset *= -1;
}
}
}
self.offsetSeconds = totalOffset;
}
- (BOOL)hasTime {
NSDateComponents *dateComponents = self.dateComponents;
BOOL hasTime = ([dateComponents hour] != NSUndefinedDateComponent
&& [dateComponents minute] != NSUndefinedDateComponent);
return hasTime;
}
- (void)setHasTime:(BOOL)shouldHaveTime {
// we'll set time values to zero or NSUndefinedDateComponent as appropriate
BOOL hadTime = self.hasTime;
if (shouldHaveTime && !hadTime) {
[dateComponents_ setHour:0];
[dateComponents_ setMinute:0];
[dateComponents_ setSecond:0];
milliseconds_ = 0;
offsetSeconds_ = NSUndefinedDateComponent;
isUniversalTime_ = NO;
} else if (hadTime && !shouldHaveTime) {
[dateComponents_ setHour:NSUndefinedDateComponent];
[dateComponents_ setMinute:NSUndefinedDateComponent];
[dateComponents_ setSecond:NSUndefinedDateComponent];
milliseconds_ = 0;
offsetSeconds_ = NSUndefinedDateComponent;
isUniversalTime_ = NO;
self.timeZone = nil;
}
}
@end