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Diffstat (limited to 'src/corelib/time/qtimezoneprivate_mac.mm')
| -rw-r--r-- | src/corelib/time/qtimezoneprivate_mac.mm | 333 |
1 files changed, 333 insertions, 0 deletions
diff --git a/src/corelib/time/qtimezoneprivate_mac.mm b/src/corelib/time/qtimezoneprivate_mac.mm new file mode 100644 index 0000000000..d3c4fbe5da --- /dev/null +++ b/src/corelib/time/qtimezoneprivate_mac.mm @@ -0,0 +1,333 @@ +/**************************************************************************** +** +** Copyright (C) 2013 John Layt <jlayt@kde.org> +** Contact: https://www.qt.io/licensing/ +** +** This file is part of the QtCore module of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:LGPL$ +** Commercial License Usage +** Licensees holding valid commercial Qt licenses may use this file in +** accordance with the commercial license agreement provided with the +** Software or, alternatively, in accordance with the terms contained in +** a written agreement between you and The Qt Company. For licensing terms +** and conditions see https://www.qt.io/terms-conditions. For further +** information use the contact form at https://www.qt.io/contact-us. +** +** GNU Lesser General Public License Usage +** Alternatively, this file may be used under the terms of the GNU Lesser +** General Public License version 3 as published by the Free Software +** Foundation and appearing in the file LICENSE.LGPL3 included in the +** packaging of this file. Please review the following information to +** ensure the GNU Lesser General Public License version 3 requirements +** will be met: https://www.gnu.org/licenses/lgpl-3.0.html. +** +** GNU General Public License Usage +** Alternatively, this file may be used under the terms of the GNU +** General Public License version 2.0 or (at your option) the GNU General +** Public license version 3 or any later version approved by the KDE Free +** Qt Foundation. The licenses are as published by the Free Software +** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3 +** included in the packaging of this file. Please review the following +** information to ensure the GNU General Public License requirements will +** be met: https://www.gnu.org/licenses/gpl-2.0.html and +** https://www.gnu.org/licenses/gpl-3.0.html. +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#include "qtimezone.h" +#include "qtimezoneprivate_p.h" + +#include "private/qcore_mac_p.h" +#include "qstringlist.h" + +#include <Foundation/NSTimeZone.h> + +#include <qdebug.h> + +#include <algorithm> + +QT_BEGIN_NAMESPACE + +/* + Private + + OS X system implementation +*/ + +// Create the system default time zone +QMacTimeZonePrivate::QMacTimeZonePrivate() + : m_nstz(0) +{ + init(systemTimeZoneId()); +} + +// Create a named time zone +QMacTimeZonePrivate::QMacTimeZonePrivate(const QByteArray &ianaId) + : m_nstz(0) +{ + init(ianaId); +} + +QMacTimeZonePrivate::QMacTimeZonePrivate(const QMacTimeZonePrivate &other) + : QTimeZonePrivate(other), m_nstz(0) +{ + m_nstz = [other.m_nstz copy]; +} + +QMacTimeZonePrivate::~QMacTimeZonePrivate() +{ + [m_nstz release]; +} + +QMacTimeZonePrivate *QMacTimeZonePrivate::clone() const +{ + return new QMacTimeZonePrivate(*this); +} + +void QMacTimeZonePrivate::init(const QByteArray &ianaId) +{ + if (availableTimeZoneIds().contains(ianaId)) { + m_nstz = [[NSTimeZone timeZoneWithName:QString::fromUtf8(ianaId).toNSString()] retain]; + if (m_nstz) + m_id = ianaId; + } +} + +QString QMacTimeZonePrivate::comment() const +{ + return QString::fromNSString([m_nstz description]); +} + +QString QMacTimeZonePrivate::displayName(QTimeZone::TimeType timeType, + QTimeZone::NameType nameType, + const QLocale &locale) const +{ + // TODO Mac doesn't support OffsetName yet so use standard offset name + if (nameType == QTimeZone::OffsetName) { + const Data nowData = data(QDateTime::currentMSecsSinceEpoch()); + // TODO Cheat for now, assume if has dst the offset if 1 hour + if (timeType == QTimeZone::DaylightTime && hasDaylightTime()) + return isoOffsetFormat(nowData.standardTimeOffset + 3600); + else + return isoOffsetFormat(nowData.standardTimeOffset); + } + + NSTimeZoneNameStyle style = NSTimeZoneNameStyleStandard; + + switch (nameType) { + case QTimeZone::ShortName : + if (timeType == QTimeZone::DaylightTime) + style = NSTimeZoneNameStyleShortDaylightSaving; + else if (timeType == QTimeZone::GenericTime) + style = NSTimeZoneNameStyleShortGeneric; + else + style = NSTimeZoneNameStyleShortStandard; + break; + case QTimeZone::DefaultName : + case QTimeZone::LongName : + if (timeType == QTimeZone::DaylightTime) + style = NSTimeZoneNameStyleDaylightSaving; + else if (timeType == QTimeZone::GenericTime) + style = NSTimeZoneNameStyleGeneric; + else + style = NSTimeZoneNameStyleStandard; + break; + case QTimeZone::OffsetName : + // Unreachable + break; + } + + NSString *macLocaleCode = locale.name().toNSString(); + NSLocale *macLocale = [[NSLocale alloc] initWithLocaleIdentifier:macLocaleCode]; + const QString result = QString::fromNSString([m_nstz localizedName:style locale:macLocale]); + [macLocale release]; + return result; +} + +QString QMacTimeZonePrivate::abbreviation(qint64 atMSecsSinceEpoch) const +{ + const NSTimeInterval seconds = atMSecsSinceEpoch / 1000.0; + return QString::fromNSString([m_nstz abbreviationForDate:[NSDate dateWithTimeIntervalSince1970:seconds]]); +} + +int QMacTimeZonePrivate::offsetFromUtc(qint64 atMSecsSinceEpoch) const +{ + const NSTimeInterval seconds = atMSecsSinceEpoch / 1000.0; + return [m_nstz secondsFromGMTForDate:[NSDate dateWithTimeIntervalSince1970:seconds]]; +} + +int QMacTimeZonePrivate::standardTimeOffset(qint64 atMSecsSinceEpoch) const +{ + return offsetFromUtc(atMSecsSinceEpoch) - daylightTimeOffset(atMSecsSinceEpoch); +} + +int QMacTimeZonePrivate::daylightTimeOffset(qint64 atMSecsSinceEpoch) const +{ + const NSTimeInterval seconds = atMSecsSinceEpoch / 1000.0; + return [m_nstz daylightSavingTimeOffsetForDate:[NSDate dateWithTimeIntervalSince1970:seconds]]; +} + +bool QMacTimeZonePrivate::hasDaylightTime() const +{ + // TODO No Mac API, assume if has transitions + return hasTransitions(); +} + +bool QMacTimeZonePrivate::isDaylightTime(qint64 atMSecsSinceEpoch) const +{ + const NSTimeInterval seconds = atMSecsSinceEpoch / 1000.0; + return [m_nstz isDaylightSavingTimeForDate:[NSDate dateWithTimeIntervalSince1970:seconds]]; +} + +QTimeZonePrivate::Data QMacTimeZonePrivate::data(qint64 forMSecsSinceEpoch) const +{ + const NSTimeInterval seconds = forMSecsSinceEpoch / 1000.0; + NSDate *date = [NSDate dateWithTimeIntervalSince1970:seconds]; + Data data; + data.atMSecsSinceEpoch = forMSecsSinceEpoch; + data.offsetFromUtc = [m_nstz secondsFromGMTForDate:date]; + data.daylightTimeOffset = [m_nstz daylightSavingTimeOffsetForDate:date]; + data.standardTimeOffset = data.offsetFromUtc - data.daylightTimeOffset; + data.abbreviation = QString::fromNSString([m_nstz abbreviationForDate:date]); + return data; +} + +bool QMacTimeZonePrivate::hasTransitions() const +{ + // TODO No direct Mac API, so return if has next after 1970, i.e. since start of tz + // TODO Not sure what is returned in event of no transitions, assume will be before requested date + NSDate *epoch = [NSDate dateWithTimeIntervalSince1970:0]; + const NSDate *date = [m_nstz nextDaylightSavingTimeTransitionAfterDate:epoch]; + const bool result = ([date timeIntervalSince1970] > [epoch timeIntervalSince1970]); + return result; +} + +QTimeZonePrivate::Data QMacTimeZonePrivate::nextTransition(qint64 afterMSecsSinceEpoch) const +{ + QTimeZonePrivate::Data tran; + const NSTimeInterval seconds = afterMSecsSinceEpoch / 1000.0; + NSDate *nextDate = [NSDate dateWithTimeIntervalSince1970:seconds]; + nextDate = [m_nstz nextDaylightSavingTimeTransitionAfterDate:nextDate]; + const NSTimeInterval nextSecs = [nextDate timeIntervalSince1970]; + if (nextDate == nil || nextSecs <= seconds) { + [nextDate release]; + return invalidData(); + } + tran.atMSecsSinceEpoch = nextSecs * 1000; + tran.offsetFromUtc = [m_nstz secondsFromGMTForDate:nextDate]; + tran.daylightTimeOffset = [m_nstz daylightSavingTimeOffsetForDate:nextDate]; + tran.standardTimeOffset = tran.offsetFromUtc - tran.daylightTimeOffset; + tran.abbreviation = QString::fromNSString([m_nstz abbreviationForDate:nextDate]); + return tran; +} + +QTimeZonePrivate::Data QMacTimeZonePrivate::previousTransition(qint64 beforeMSecsSinceEpoch) const +{ + // The native API only lets us search forward, so we need to find an early-enough start: + const NSTimeInterval lowerBound = std::numeric_limits<NSTimeInterval>::lowest(); + const qint64 endSecs = beforeMSecsSinceEpoch / 1000; + const int year = 366 * 24 * 3600; // a (long) year, in seconds + NSTimeInterval prevSecs = endSecs; // sentinel for later check + NSTimeInterval nextSecs = prevSecs - year; + NSTimeInterval tranSecs = lowerBound; // time at a transition; may be > endSecs + + NSDate *nextDate = [NSDate dateWithTimeIntervalSince1970:nextSecs]; + nextDate = [m_nstz nextDaylightSavingTimeTransitionAfterDate:nextDate]; + if (nextDate != nil + && (tranSecs = [nextDate timeIntervalSince1970]) < endSecs) { + // There's a transition within the last year before endSecs: + nextSecs = tranSecs; + } else { + // Need to start our search earlier: + nextDate = [NSDate dateWithTimeIntervalSince1970:lowerBound]; + nextDate = [m_nstz nextDaylightSavingTimeTransitionAfterDate:nextDate]; + if (nextDate != nil) { + NSTimeInterval lateSecs = nextSecs; + nextSecs = [nextDate timeIntervalSince1970]; + Q_ASSERT(nextSecs <= endSecs - year || nextSecs == tranSecs); + /* + We're looking at the first ever transition for our zone, at + nextSecs (and our zone *does* have at least one transition). If + it's later than endSecs - year, then we must have found it on the + initial check and therefore set tranSecs to the same transition + time (which, we can infer here, is >= endSecs). In this case, we + won't enter the binary-chop loop, below. + + In the loop, nextSecs < lateSecs < endSecs: we have a transition + at nextSecs and there is no transition between lateSecs and + endSecs. The loop narrows the interval between nextSecs and + lateSecs by looking for a transition after their mid-point; if it + finds one < endSecs, nextSecs moves to this transition; otherwise, + lateSecs moves to the mid-point. This soon enough narrows the gap + to within a year, after which walking forward one transition at a + time (the "Wind through" loop, below) is good enough. + */ + + // Binary chop to within a year of last transition before endSecs: + while (nextSecs + year < lateSecs) { + // Careful about overflow, not fussy about rounding errors: + NSTimeInterval middle = nextSecs / 2 + lateSecs / 2; + NSDate *split = [NSDate dateWithTimeIntervalSince1970:middle]; + split = [m_nstz nextDaylightSavingTimeTransitionAfterDate:split]; + if (split != nil + && (tranSecs = [split timeIntervalSince1970]) < endSecs) { + nextDate = split; + nextSecs = tranSecs; + } else { + lateSecs = middle; + } + } + Q_ASSERT(nextDate != nil); + // ... and nextSecs < endSecs unless first transition ever was >= endSecs. + } // else: we have no data - prevSecs is still endSecs, nextDate is still nil + } + // Either nextDate is nil or nextSecs is at its transition. + + // Wind through remaining transitions (spanning at most a year), one at a time: + while (nextDate != nil && nextSecs < endSecs) { + prevSecs = nextSecs; + nextDate = [m_nstz nextDaylightSavingTimeTransitionAfterDate:nextDate]; + nextSecs = [nextDate timeIntervalSince1970]; + if (nextSecs <= prevSecs) // presumably no later data available + break; + } + if (prevSecs < endSecs) // i.e. we did make it into that while loop + return data(qint64(prevSecs * 1e3)); + + // No transition data; or first transition later than requested time. + return invalidData(); +} + +QByteArray QMacTimeZonePrivate::systemTimeZoneId() const +{ + // Reset the cached system tz then return the name + [NSTimeZone resetSystemTimeZone]; + return QString::fromNSString([[NSTimeZone systemTimeZone] name]).toUtf8(); +} + +QList<QByteArray> QMacTimeZonePrivate::availableTimeZoneIds() const +{ + NSEnumerator *enumerator = [[NSTimeZone knownTimeZoneNames] objectEnumerator]; + QByteArray tzid = QString::fromNSString([enumerator nextObject]).toUtf8(); + + QList<QByteArray> list; + while (!tzid.isEmpty()) { + list << tzid; + tzid = QString::fromNSString([enumerator nextObject]).toUtf8(); + } + + std::sort(list.begin(), list.end()); + list.erase(std::unique(list.begin(), list.end()), list.end()); + + return list; +} + +NSTimeZone *QMacTimeZonePrivate::nsTimeZone() const +{ + return m_nstz; +} + +QT_END_NAMESPACE |