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// Copyright 2015 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chromeos/ash/components/settings/timezone_settings_helper.h"
#include "base/check.h"
namespace ash::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;
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 ash::system
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