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/*
* Copyright 2017 Google
*
* 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.
*/
#import "FSTTimestamp.h"
#import "FSTAssert.h"
#import "FSTComparison.h"
NS_ASSUME_NONNULL_BEGIN
static const int kNanosPerSecond = 1000000000;
@implementation FSTTimestamp
#pragma mark - Constructors
+ (instancetype)timestamp {
return [FSTTimestamp timestampWithDate:[NSDate date]];
}
+ (instancetype)timestampWithDate:(NSDate *)date {
double secondsDouble;
double fraction = modf(date.timeIntervalSince1970, &secondsDouble);
// GCP Timestamps always have non-negative nanos.
if (fraction < 0) {
fraction += 1.0;
secondsDouble -= 1.0;
}
int64_t seconds = (int64_t)secondsDouble;
int32_t nanos = (int32_t)(fraction * kNanosPerSecond);
return [[FSTTimestamp alloc] initWithSeconds:seconds nanos:nanos];
}
- (instancetype)initWithSeconds:(int64_t)seconds nanos:(int32_t)nanos {
self = [super init];
if (self) {
FSTAssert(nanos >= 0, @"timestamp nanoseconds out of range: %d", nanos);
FSTAssert(nanos < 1e9, @"timestamp nanoseconds out of range: %d", nanos);
// Midnight at the beginning of 1/1/1 is the earliest timestamp Firestore supports.
FSTAssert(seconds >= -62135596800L, @"timestamp seconds out of range: %lld", seconds);
// This will break in the year 10,000.
FSTAssert(seconds < 253402300800L, @"timestamp seconds out of range: %lld", seconds);
_seconds = seconds;
_nanos = nanos;
}
return self;
}
#pragma mark - NSObject methods
- (BOOL)isEqual:(id)object {
if (self == object) {
return YES;
}
if (![object isKindOfClass:[FSTTimestamp class]]) {
return NO;
}
return [self isEqualToTimestamp:(FSTTimestamp *)object];
}
- (NSUInteger)hash {
return (NSUInteger)((self.seconds >> 32) ^ self.seconds ^ self.nanos);
}
- (NSString *)description {
return [NSString
stringWithFormat:@"<FSTTimestamp: seconds=%lld nanos=%d>", self.seconds, self.nanos];
}
/** Implements NSCopying without actually copying because timestamps are immutable. */
- (id)copyWithZone:(NSZone *_Nullable)zone {
return self;
}
#pragma mark - Public methods
- (NSDate *)approximateDateValue {
NSTimeInterval interval = (NSTimeInterval)self.seconds + ((NSTimeInterval)self.nanos) / 1e9;
return [NSDate dateWithTimeIntervalSince1970:interval];
}
- (BOOL)isEqualToTimestamp:(FSTTimestamp *)other {
return [self compare:other] == NSOrderedSame;
}
- (NSString *)ISO8601String {
NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
formatter.dateFormat = @"yyyy-MM-dd'T'HH:mm:ss";
formatter.timeZone = [NSTimeZone timeZoneWithName:@"UTC"];
NSDate *secondsDate = [NSDate dateWithTimeIntervalSince1970:self.seconds];
NSString *secondsString = [formatter stringFromDate:secondsDate];
FSTAssert(secondsString.length == 19, @"Invalid ISO string: %@", secondsString);
NSString *nanosString = [NSString stringWithFormat:@"%09d", self.nanos];
return [NSString stringWithFormat:@"%@.%@Z", secondsString, nanosString];
}
- (NSComparisonResult)compare:(FSTTimestamp *)other {
NSComparisonResult result = FSTCompareInt64s(self.seconds, other.seconds);
if (result != NSOrderedSame) {
return result;
}
return FSTCompareInt32s(self.nanos, other.nanos);
}
@end
NS_ASSUME_NONNULL_END
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