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- // 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 "ash/components/settings/timezone_settings_helper.h"
- #include "base/check.h"
- #include "base/component_export.h"
- namespace ash {
- namespace system {
- COMPONENT_EXPORT(ASH_SETTINGS)
- 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;
- timezone.getID(id);
- UErrorCode status = U_ZERO_ERROR;
- icu::TimeZone::getCanonicalID(id, canonical_id, status);
- DCHECK(U_SUCCESS(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;
- entry->getID(entry_id);
- icu::TimeZone::getCanonicalID(entry_id, entry_canonical_id, status);
- DCHECK(U_SUCCESS(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 ash
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