components/translate/core/browser/translate_accept_languages.h

   1 // Copyright 2014 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 COMPONENTS_TRANSLATE_CORE_BROWSER_TRANSLATE_ACCEPT_LANGUAGES_H_
   6 #define COMPONENTS_TRANSLATE_CORE_BROWSER_TRANSLATE_ACCEPT_LANGUAGES_H_
   7
   8 #include <set>
   9 #include <string>
  10
  11 #include "base/basictypes.h"
  12 #include "base/prefs/pref_change_registrar.h"
  13
  14 class PrefService;
  15
  16 namespace translate {
  17
  18 // TranslateAcceptLanguages tracks the value of the "Accept-Language" HTTP
  19 // header.
  20 class TranslateAcceptLanguages {
  21  public:
  22   // |accept_languages_pref| is the path to the preference storing the accept
  23   // languages.
  24   TranslateAcceptLanguages(PrefService* prefs,
  25                            const char* accept_languages_pref);
  26   virtual ~TranslateAcceptLanguages();
  27
  28   // Returns true if |language| is available as Accept-Languages. |language|
  29   // will be converted if it has the synonym of accept language.
  30   static bool CanBeAcceptLanguage(const std::string& language);
  31
  32   // Returns true if the passed language has been configured by the user as an
  33   // accept language. |language| will be converted if it has the synonym of
  34   // accept languages.
  35   bool IsAcceptLanguage(const std::string& language);
  36
  37  private:
  38   // Initializes the |accept_languages_| language table based on the associated
  39   // preference in |prefs|.
  40   void InitAcceptLanguages(PrefService* prefs);
  41
  42   // Set of accept languages.
  43   std::set<std::string> accept_languages_;
  44
  45   // Listens to accept languages changes.
  46   PrefChangeRegistrar pref_change_registrar_;
  47
  48   // Path of accept languages preference.
  49   const std::string accept_languages_pref_;
  50
  51   DISALLOW_COPY_AND_ASSIGN(TranslateAcceptLanguages);
  52 };
  53
  54 }  // namespace translate
  55
  56 #endif  // COMPONENTS_TRANSLATE_CORE_BROWSER_TRANSLATE_ACCEPT_LANGUAGES_H_