153 lines
4.6 KiB
Objective-C
153 lines
4.6 KiB
Objective-C
/*
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* Copyright 2017 Google
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#import "Firestore/Source/API/FIRTimestamp+Internal.h"
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NS_ASSUME_NONNULL_BEGIN
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static const int kNanosPerSecond = 1000000000;
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@implementation FIRTimestamp (Internal)
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#pragma mark - Internal public methods
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- (NSString *)ISO8601String {
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NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
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formatter.dateFormat = @"yyyy-MM-dd'T'HH:mm:ss";
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formatter.timeZone = [NSTimeZone timeZoneWithName:@"UTC"];
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NSDate *secondsDate = [NSDate dateWithTimeIntervalSince1970:self.seconds];
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NSString *secondsString = [formatter stringFromDate:secondsDate];
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if (secondsString.length != 19) {
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[NSException raise:@"Invalid ISO string" format:@"Invalid ISO string: %@", secondsString];
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}
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NSString *nanosString = [NSString stringWithFormat:@"%09d", self.nanoseconds];
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return [NSString stringWithFormat:@"%@.%@Z", secondsString, nanosString];
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}
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@end
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@implementation FIRTimestamp
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#pragma mark - Constructors
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+ (instancetype)timestampWithDate:(NSDate *)date {
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double secondsDouble;
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double fraction = modf(date.timeIntervalSince1970, &secondsDouble);
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// GCP Timestamps always have non-negative nanos.
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if (fraction < 0) {
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fraction += 1.0;
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secondsDouble -= 1.0;
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}
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int64_t seconds = (int64_t)secondsDouble;
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int32_t nanos = (int32_t)(fraction * kNanosPerSecond);
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return [[FIRTimestamp alloc] initWithSeconds:seconds nanoseconds:nanos];
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}
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+ (instancetype)timestampWithSeconds:(int64_t)seconds nanoseconds:(int32_t)nanoseconds {
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return [[FIRTimestamp alloc] initWithSeconds:seconds nanoseconds:nanoseconds];
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}
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+ (instancetype)timestamp {
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return [FIRTimestamp timestampWithDate:[NSDate date]];
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}
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- (instancetype)initWithSeconds:(int64_t)seconds nanoseconds:(int32_t)nanoseconds {
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self = [super init];
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if (self) {
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if (nanoseconds < 0) {
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[NSException raise:@"Invalid timestamp"
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format:@"Timestamp nanoseconds out of range: %d", nanoseconds];
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}
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if (nanoseconds >= 1e9) {
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[NSException raise:@"Invalid timestamp"
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format:@"Timestamp nanoseconds out of range: %d", nanoseconds];
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}
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// Midnight at the beginning of 1/1/1 is the earliest timestamp supported.
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if (seconds < -62135596800L) {
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[NSException raise:@"Invalid timestamp"
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format:@"Timestamp seconds out of range: %lld", seconds];
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}
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// This will break in the year 10,000.
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if (seconds >= 253402300800L) {
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[NSException raise:@"Invalid timestamp"
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format:@"Timestamp seconds out of range: %lld", seconds];
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}
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_seconds = seconds;
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_nanoseconds = nanoseconds;
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}
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return self;
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}
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#pragma mark - NSObject methods
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- (BOOL)isEqual:(id)object {
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if (self == object) {
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return YES;
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}
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if (![object isKindOfClass:[FIRTimestamp class]]) {
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return NO;
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}
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return [self isEqualToTimestamp:(FIRTimestamp *)object];
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}
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- (NSUInteger)hash {
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return (NSUInteger)((self.seconds >> 32) ^ self.seconds ^ self.nanoseconds);
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}
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- (NSString *)description {
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return [NSString stringWithFormat:@"<FIRTimestamp: seconds=%lld nanoseconds=%d>", self.seconds,
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self.nanoseconds];
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}
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/** Implements NSCopying without actually copying because timestamps are immutable. */
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- (id)copyWithZone:(__unused NSZone *_Nullable)zone {
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return self;
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}
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#pragma mark - Public methods
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- (NSDate *)dateValue {
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NSTimeInterval interval = (NSTimeInterval)self.seconds + ((NSTimeInterval)self.nanoseconds) / 1e9;
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return [NSDate dateWithTimeIntervalSince1970:interval];
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}
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- (NSComparisonResult)compare:(FIRTimestamp *)other {
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if (self.seconds < other.seconds) {
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return NSOrderedAscending;
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} else if (self.seconds > other.seconds) {
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return NSOrderedDescending;
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}
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if (self.nanoseconds < other.nanoseconds) {
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return NSOrderedAscending;
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} else if (self.nanoseconds > other.nanoseconds) {
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return NSOrderedDescending;
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}
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return NSOrderedSame;
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}
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#pragma mark - Private methods
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- (BOOL)isEqualToTimestamp:(FIRTimestamp *)other {
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return [self compare:other] == NSOrderedSame;
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}
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@end
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NS_ASSUME_NONNULL_END
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