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      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 COMPONENTS_USER_PREFS_USER_PREFS_H_
      6 #define COMPONENTS_USER_PREFS_USER_PREFS_H_
      7 
      8 #include "base/basictypes.h"
      9 #include "base/supports_user_data.h"
     10 #include "components/user_prefs/user_prefs_export.h"
     11 
     12 class PrefService;
     13 
     14 namespace content {
     15 class BrowserContext;
     16 }
     17 
     18 namespace user_prefs {
     19 
     20 // Components may use preferences associated with a given user. These
     21 // hang off of content::BrowserContext and can be retrieved using
     22 // UserPrefs::Get().
     23 //
     24 // It is up to the embedder to create and own the PrefService and
     25 // attach it to BrowserContext using the UserPrefs::Set() function.
     26 class USER_PREFS_EXPORT UserPrefs : public base::SupportsUserData::Data {
     27  public:
     28   // Retrieves the PrefService for a given BrowserContext, or NULL if
     29   // none is attached.
     30   static PrefService* Get(content::BrowserContext* context);
     31 
     32   // Hangs the specified |prefs| off of |context|. Should be called
     33   // only once per BrowserContext.
     34   static void Set(content::BrowserContext* context, PrefService* prefs);
     35 
     36  private:
     37   explicit UserPrefs(PrefService* prefs);
     38   virtual ~UserPrefs();
     39 
     40   // Non-owning; owned by embedder.
     41   PrefService* prefs_;
     42 
     43   DISALLOW_COPY_AND_ASSIGN(UserPrefs);
     44 };
     45 
     46 }  // namespace user_prefs
     47 
     48 #endif  // COMPONENTS_USER_PREFS_USER_PREFS_H_
     49