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 CHROME_BROWSER_TRANSLATE_TRANSLATE_ACCEPT_LANGUAGES_H_
   6 #define CHROME_BROWSER_TRANSLATE_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
  23   // |accept_languages_pref| is the path to the preference storing the accept
  24   // languages.
  25   TranslateAcceptLanguages(PrefService* prefs,
  26                            const char* accept_languages_pref);
  27   virtual ~TranslateAcceptLanguages();
  28
  29   // Returns true if |language| is available as Accept-Languages. |language|
  30   // will be converted if it has the synonym of accept language.
  31   static bool CanBeAcceptLanguage(const std::string& language);
  32
  33   // Returns true if the passed language has been configured by the user as an
  34   // accept language. |language| will be converted if it has the synonym of
  35   // accept languages.
  36   bool IsAcceptLanguage(const std::string& language);
  37
  38  private:
  39   // Initializes the |accept_languages_| language table based on the associated
  40   // preference in |prefs|.
  41   void InitAcceptLanguages(PrefService* prefs);
  42
  43   // Set of accept languages.
  44   std::set<std::string> accept_languages_;
  45
  46   // Listens to accept languages changes.
  47   PrefChangeRegistrar pref_change_registrar_;
  48
  49   // Path of accept languages preference.
  50   const std::string accept_languages_pref_;
  51
  52   DISALLOW_COPY_AND_ASSIGN(TranslateAcceptLanguages);
  53 };
  54
  55 }  // namespace translate
  56
  57 #endif  // CHROME_BROWSER_TRANSLATE_TRANSLATE_ACCEPT_LANGUAGES_H_