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//
// SKSensorTimestamp.m
// SensingKit
//
// Copyright (c) 2014. Queen Mary University of London
// Kleomenis Katevas, k.katevas@qmul.ac.uk
//
// This file is part of SensingKit-iOS library.
// For more information, please visit http://www.sensingkit.org
//
// SensingKit-iOS is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// SensingKit-iOS is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with SensingKit-iOS. If not, see <http://www.gnu.org/licenses/>.
//
#import "SKSensorTimestamp.h"
@implementation SKSensorTimestamp
+ (instancetype)sensorTimestampFromDate:(NSDate *)date
{
NSTimeInterval timeInterval = date.timeIntervalSince1970 - [SKSensorTimestamp dateOfLastBoot].timeIntervalSince1970;
return [[SKSensorTimestamp alloc] initWithDate:date withTimeInterval:timeInterval];
}
+ (instancetype)sensorTimestampFromTimeInterval:(NSTimeInterval)timeInterval
{
NSDate *date = [NSDate dateWithTimeInterval:timeInterval sinceDate:[SKSensorTimestamp dateOfLastBoot]];
return [[SKSensorTimestamp alloc] initWithDate:date withTimeInterval:timeInterval];
}
- (instancetype)initWithDate:(NSDate *)date
withTimeInterval:(NSTimeInterval)timeInterval
{
if (self = [super init])
{
_timestamp = date;
_timeIntervalSinceLastBoot = timeInterval;
}
return self;
}
- (id)copyWithZone:(NSZone *)zone
{
SKSensorTimestamp *sensorTimestamp = [[[self class] alloc] initWithDate:_timestamp
withTimeInterval:_timeIntervalSinceLastBoot];
return sensorTimestamp;
}
+ (NSDate *)dateOfLastBoot
{
static NSDate *lastBoot;
if (!lastBoot)
{
NSTimeInterval systemUptime = [NSProcessInfo processInfo].systemUptime;
NSTimeInterval timeIntervalSince1970 = [NSDate date].timeIntervalSince1970;
lastBoot = [NSDate dateWithTimeIntervalSince1970:timeIntervalSince1970 - systemUptime];
}
return lastBoot;
}
+ (NSDateFormatter *)dateFormatter
{
static NSDateFormatter *dateFormatter;
if (!dateFormatter)
{
dateFormatter = [[NSDateFormatter alloc] init];
dateFormatter.locale = [[NSLocale alloc] initWithLocaleIdentifier:@"en_US"];
dateFormatter.timeZone = [NSTimeZone timeZoneForSecondsFromGMT:0.0];
dateFormatter.dateFormat = @"yyyy-MM-dd HH:mm:ss.SSS ZZZ";
}
return dateFormatter;
}
- (NSDictionary *)timestampDictionary
{
return @{
@"timestamp": self.timestampString,
@"timeIntervalSince1970": @(self.timeIntervalSince1970),
@"timeIntervalSinceLastBoot": @(self.timeIntervalSinceLastBoot)
};
}
- (NSString *)timestampString
{
return [[SKSensorTimestamp dateFormatter] stringFromDate:_timestamp];
}
- (NSTimeInterval)timeIntervalSince1970
{
return _timestamp.timeIntervalSince1970;
}
@end