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// Copyright 2013 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.
#ifndef CHROME_BROWSER_TRANSLATE_TRANSLATE_LANGUAGE_LIST_H_
#define CHROME_BROWSER_TRANSLATE_TRANSLATE_LANGUAGE_LIST_H_
#include <set>
#include <string>
#include <vector>
#include "base/memory/scoped_ptr.h"
#include "base/time/time.h"
#include "chrome/browser/web_resource/resource_request_allowed_notifier.h"
class TranslateURLFetcher;
// The TranslateLanguageList class is responsible for maintaining the latest
// supporting language list.
// This class is defined to be owned only by TranslateManager.
class TranslateLanguageList : public ResourceRequestAllowedNotifier::Observer {
public:
static const int kFetcherId = 1;
TranslateLanguageList();
virtual ~TranslateLanguageList();
// Returns the last-updated time when the language list is fetched from the
// Translate server. Returns null time if the list is yet to be fetched.
base::Time last_updated() { return last_updated_; }
// Fills |languages| with the list of languages that the translate server can
// translate to and from. |languages| will include alpha languages.
void GetSupportedLanguages(std::vector<std::string>* languages);
// Returns the language code that can be used with the Translate method for a
// specified |chrome_locale|.
std::string GetLanguageCode(const std::string& chrome_locale);
// Returns true if |language| is supported by the translation server. It also
// returns true against alpha languages.
bool IsSupportedLanguage(const std::string& language);
// Returns true if |language| is supported by the translation server as a
// alpha language.
bool IsAlphaLanguage(const std::string& language);
// Fetches the language list from the translate server. It will retry
// automatically when a server return 5xx errors and retry count doesn't
// reach to limits.
void RequestLanguageList();
// ResourceRequestAllowedNotifier::Observer implementation:
virtual void OnResourceRequestsAllowed() OVERRIDE;
// Disables the language list updater. This is used only for testing now.
static void DisableUpdate();
// static const values shared with our browser tests.
static const char kLanguageListCallbackName[];
static const char kTargetLanguagesKey[];
static const char kAlphaLanguagesKey[];
private:
// Callback function called when TranslateURLFetcher::Request() is finished.
void OnLanguageListFetchComplete(int id,
bool success,
const std::string& data);
// All the languages supported by the translation server.
std::set<std::string> all_supported_languages_;
// Alpha languages supported by the translation server.
std::set<std::string> alpha_languages_;
// A LanguageListFetcher instance to fetch a server providing supported
// language list including alpha languages.
scoped_ptr<TranslateURLFetcher> language_list_fetcher_;
// The last-updated time when the language list is sent.
base::Time last_updated_;
// Helper class to know if it's allowed to make network resource requests.
ResourceRequestAllowedNotifier resource_request_allowed_notifier_;
DISALLOW_COPY_AND_ASSIGN(TranslateLanguageList);
};
#endif // CHROME_BROWSER_TRANSLATE_TRANSLATE_LANGUAGE_LIST_H_
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