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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 "Firestore/Source/Core/FSTSnapshotVersion.h"
#import "FIRTimestamp.h"
NS_ASSUME_NONNULL_BEGIN
@implementation FSTSnapshotVersion
+ (instancetype)noVersion {
static FSTSnapshotVersion *min;
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
FIRTimestamp *timestamp = [[FIRTimestamp alloc] initWithSeconds:0 nanoseconds:0];
min = [FSTSnapshotVersion versionWithTimestamp:timestamp];
});
return min;
}
+ (instancetype)versionWithTimestamp:(FIRTimestamp *)timestamp {
return [[FSTSnapshotVersion alloc] initWithTimestamp:timestamp];
}
- (instancetype)initWithTimestamp:(FIRTimestamp *)timestamp {
self = [super init];
if (self) {
_timestamp = timestamp;
}
return self;
}
#pragma mark - NSObject methods
- (BOOL)isEqual:(id)object {
if (self == object) {
return YES;
}
if (![object isKindOfClass:[FSTSnapshotVersion class]]) {
return NO;
}
return [self.timestamp isEqual:((FSTSnapshotVersion *)object).timestamp];
}
- (NSUInteger)hash {
return self.timestamp.hash;
}
- (NSString *)description {
return [NSString stringWithFormat:@"<FSTSnapshotVersion: %@>", self.timestamp];
}
- (id)copyWithZone:(NSZone *_Nullable)zone {
// Implements NSCopying without actually copying because timestamps are immutable.
return self;
}
#pragma mark - Public methods
- (NSComparisonResult)compare:(FSTSnapshotVersion *)other {
return [self.timestamp compare:other.timestamp];
}
@end
NS_ASSUME_NONNULL_END
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