chrome/installer/util/language_selector.h

   1 // Copyright (c) 2010 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 // This file declares a helper class for selecting a supported language from a
   6 // set of candidates.
   7
   8 #ifndef CHROME_INSTALLER_UTIL_LANGUAGE_SELECTOR_H_
   9 #define CHROME_INSTALLER_UTIL_LANGUAGE_SELECTOR_H_
  10
  11 #include <string>
  12 #include <vector>
  13
  14 #include "base/basictypes.h"
  15
  16 namespace installer {
  17
  18 // A helper class for selecting a supported language from a set of candidates.
  19 // By default, the candidates are retrieved from the operating system.
  20 class LanguageSelector {
  21  public:
  22   // Default constructor will select from the set of languages supported by the
  23   // operating system.
  24   LanguageSelector();
  25
  26   // Constructor for testing purposes.
  27   explicit LanguageSelector(const std::vector<std::wstring>& candidates);
  28
  29   ~LanguageSelector();
  30
  31   // The offset of the matched language (i.e., IDS_L10N_OFFSET_*).
  32   int offset() const { return offset_; }
  33
  34   // The full name of the candidate language for which a match was found.
  35   const std::wstring& matched_candidate() const { return matched_candidate_; }
  36
  37   // The name of the selected translation.
  38   std::wstring selected_translation() const { return GetLanguageName(offset_); }
  39
  40   // Returns the name of a translation given its offset.
  41   static std::wstring GetLanguageName(int offset);
  42
  43  private:
  44   typedef bool (*SelectPred_Fn)(const std::wstring&, int*);
  45
  46   static bool SelectIf(const std::vector<std::wstring>& candidates,
  47                        SelectPred_Fn select_predicate,
  48                        std::wstring* matched_name, int* matched_offset);
  49   void DoSelect(const std::vector<std::wstring>& candidates);
  50
  51   std::wstring matched_candidate_;
  52   int offset_;
  53
  54   DISALLOW_COPY_AND_ASSIGN(LanguageSelector);
  55 };
  56
  57 }  // namespace installer.
  58
  59 #endif  // CHROME_INSTALLER_UTIL_LANGUAGE_SELECTOR_H_