blob: b4203a6f4713868abc69469010c73937dd68c1ff [file] [log] [blame]
// Copyright 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chromeos/settings/timezone_settings_helper.h"
#include "base/check.h"
#include "base/component_export.h"
namespace chromeos {
namespace system {
const icu::TimeZone* GetKnownTimezoneOrNull(
const icu::TimeZone& timezone,
const std::vector<std::unique_ptr<icu::TimeZone>>& timezone_list) {
const icu::TimeZone* known_timezone = nullptr;
icu::UnicodeString id, canonical_id;
UErrorCode status = U_ZERO_ERROR;
icu::TimeZone::getCanonicalID(id, canonical_id, status);
for (const auto& entry : timezone_list) {
if (*entry.get() == timezone)
return entry.get();
// Compare the canonical IDs as well.
// For instance, Asia/Ulan_Bator -> Asia/Ulaanbaatar or
// Canada/Pacific -> America/Vancouver
icu::UnicodeString entry_id, entry_canonical_id;
icu::TimeZone::getCanonicalID(entry_id, entry_canonical_id, status);
if (entry_canonical_id == canonical_id)
return entry.get();
// Last resort: If no match is found, the last timezone in the list
// with matching rules will be returned.
if (entry->hasSameRules(timezone))
known_timezone = entry.get();
// May return null if we did not find a matching timezone in our list.
return known_timezone;
} // namespace system
} // namespace chromeos