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// Copyright 2016 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef COMPONENTS_AUTOFILL_CORE_BROWSER_GEO_COUNTRY_NAMES_H_
#define COMPONENTS_AUTOFILL_CORE_BROWSER_GEO_COUNTRY_NAMES_H_
#include <functional>
#include <map>
#include <memory>
#include <string>
#include <string_view>
#include "base/containers/lru_cache.h"
#include "base/no_destructor.h"
#include "base/synchronization/lock.h"
#include "components/autofill/core/browser/geo/country_names_for_locale.h"
namespace autofill {
// A singleton class that encapsulates mappings from country names to their
// corresponding country codes.
class CountryNames {
public:
// The first call to this function, causing the creation of CountryNames,
// is expensive.
static CountryNames* GetInstance();
CountryNames(const CountryNames&) = delete;
CountryNames& operator=(const CountryNames&) = delete;
// Returns the country code corresponding to the `country_name` queried for
// the application and default locale.
const std::string& GetCountryCode(std::u16string_view country_name) const;
// Returns the country code for a `country_name` provided with a
// `locale_name`. If no country code can be determined, an empty string is
// returned. The purpose of this method is to translate country names from a
// locale different to one the instance was constructed for.
const std::string& GetCountryCodeForLocalizedCountryName(
std::u16string_view country_name,
std::string_view locale_name);
#if defined(UNIT_TEST)
// Returns true if the country names for the locale_name are in the cache.
// Only used for testing.
bool IsCountryNamesForLocaleCachedForTesting(std::string_view locale_name) {
auto iter = localized_country_names_cache_.Get(locale_name);
return iter != localized_country_names_cache_.end();
}
#endif
protected:
// Create CountryNames for `locale_name`. Protected for testing.
explicit CountryNames(std::string locale_name);
// Protected for testing.
~CountryNames();
private:
// Create CountryNames for the default locale.
CountryNames();
friend base::NoDestructor<CountryNames>;
// Caches localized country name for a locale that is neither the application
// or default locale. The Cache is keyed by the locale_name and contains
// `CountryNamesForLocale` instances.
using LocalizedCountryNamesCache =
base::LRUCache<std::string, CountryNamesForLocale, std::less<>>;
// The locale object for the application locale string.
const std::string application_locale_name_;
// Maps country names localized for the default locale to country codes.
const CountryNamesForLocale country_names_for_default_locale_;
// Maps country names localized for the application locale to country codes.
const CountryNamesForLocale country_names_for_application_locale_;
// Maps from common country names, including 2- and 3-letter country codes,
// to the corresponding 2-letter country codes. The keys are uppercase ASCII
// strings.
const std::map<std::string, std::string> common_names_;
// A MRU cache to store localized strings for non-default locale lookups.
LocalizedCountryNamesCache localized_country_names_cache_;
// A lock for accessing and manipulating the localization cache.
base::Lock localized_country_names_cache_lock_;
};
} // namespace autofill
#endif // COMPONENTS_AUTOFILL_CORE_BROWSER_GEO_COUNTRY_NAMES_H_
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