chrome/browser/translate/translate_accept_languages.h

   1 // Copyright 2013 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef CHROME_BROWSER_TRANSLATE_TRANSLATE_ACCEPT_LANGUAGES_H_
   6 #define CHROME_BROWSER_TRANSLATE_TRANSLATE_ACCEPT_LANGUAGES_H_
   7
   8 #include <map>
   9 #include <set>
  10 #include <string>
  11
  12 #include "base/basictypes.h"
  13 #include "content/public/browser/notification_observer.h"
  14 #include "content/public/browser/notification_registrar.h"
  15
  16 class PrefChangeRegistrar;
  17 class PrefService;
  18 class Profile;
  19
  20 class TranslateAcceptLanguages : public content::NotificationObserver {
  21  public:
  22   TranslateAcceptLanguages();
  23   virtual ~TranslateAcceptLanguages();
  24
  25   // Returns true if |language| is available as Accept-Languages. |language|
  26   // will be cnverted if it has the synonym of accept language.
  27   static bool CanBeAcceptLanguage(const std::string& language);
  28
  29   // Returns true if the passed language has been configured by the user as an
  30   // accept language. |language| will be converted if it has the synonym of
  31   // accept languages.
  32   bool IsAcceptLanguage(Profile* profile,
  33                         const std::string& language);
  34
  35  private:
  36   // content::NotificationObserver implementation:
  37   virtual void Observe(int type,
  38                        const content::NotificationSource& source,
  39                        const content::NotificationDetails& details) OVERRIDE;
  40
  41   // Initializes the |accept_languages_| language table based on the associated
  42   // preference in |prefs|.
  43   void InitAcceptLanguages(PrefService* prefs);
  44
  45   // A map that associates a profile with its parsed "accept languages".
  46   typedef std::set<std::string> LanguageSet;
  47   typedef std::map<PrefService*, LanguageSet> PrefServiceLanguagesMap;
  48   PrefServiceLanguagesMap accept_languages_;
  49
  50   // Each PrefChangeRegistrar only tracks a single PrefService, so a map from
  51   // each PrefService used to its registrar is needed.
  52   typedef std::map<PrefService*, PrefChangeRegistrar*> PrefServiceRegistrarMap;
  53   PrefServiceRegistrarMap pref_change_registrars_;
  54
  55   content::NotificationRegistrar notification_registrar_;
  56
  57   DISALLOW_COPY_AND_ASSIGN(TranslateAcceptLanguages);
  58 };
  59
  60 #endif  // CHROME_BROWSER_TRANSLATE_TRANSLATE_ACCEPT_LANGUAGES_H_