content/browser/time_zone_monitor.cc

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "content/browser/time_zone_monitor.h"
   6
   7 #include "base/logging.h"
   8 #include "content/public/browser/browser_thread.h"
   9 #include "content/public/browser/render_process_host.h"
  10 #include "third_party/icu/source/common/unicode/unistr.h"
  11 #include "third_party/icu/source/i18n/unicode/timezone.h"
  12
  13 namespace content {
  14
  15 TimeZoneMonitor::TimeZoneMonitor() {
  16   DCHECK_CURRENTLY_ON(BrowserThread::UI);
  17 }
  18
  19 TimeZoneMonitor::~TimeZoneMonitor() {
  20   DCHECK_CURRENTLY_ON(BrowserThread::UI);
  21 }
  22
  23 void TimeZoneMonitor::NotifyRenderers() {
  24   DCHECK_CURRENTLY_ON(BrowserThread::UI);
  25 #if defined(OS_CHROMEOS)
  26   // On CrOS, ICU's default tz is already set to a new zone. No
  27   // need to redetect it with detectHostTimeZone().
  28   scoped_ptr<icu::TimeZone> new_zone(icu::TimeZone::createDefault());
  29 #else
  30   icu::TimeZone* new_zone = icu::TimeZone::detectHostTimeZone();
  31 #if defined(OS_LINUX)
  32   // We get here multiple times on Linux per a single tz change, but
  33   // want to update the ICU default zone and notify renderer only once.
  34   scoped_ptr<icu::TimeZone> current_zone(icu::TimeZone::createDefault());
  35   if (*current_zone == *new_zone) {
  36     VLOG(1) << "timezone already updated";
  37     delete new_zone;
  38     return;
  39   }
  40 #endif
  41   icu::TimeZone::adoptDefault(new_zone);
  42 #endif
  43   icu::UnicodeString zone_id;
  44   std::string zone_id_str;
  45   new_zone->getID(zone_id).toUTF8String(zone_id_str);
  46   VLOG(1) << "timezone reset to " << zone_id_str;
  47   for (RenderProcessHost::iterator iterator =
  48            RenderProcessHost::AllHostsIterator();
  49        !iterator.IsAtEnd();
  50        iterator.Advance()) {
  51     iterator.GetCurrentValue()->NotifyTimezoneChange(zone_id_str);
  52   }
  53 }
  54
  55 }  // namespace content