base/prefs/value_map_pref_store.h

   1 // Copyright (c) 2012 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 BASE_PREFS_VALUE_MAP_PREF_STORE_H_
   6 #define BASE_PREFS_VALUE_MAP_PREF_STORE_H_
   7
   8 #include <map>
   9 #include <string>
  10
  11 #include "base/basictypes.h"
  12 #include "base/observer_list.h"
  13 #include "base/prefs/base_prefs_export.h"
  14 #include "base/prefs/pref_value_map.h"
  15 #include "base/prefs/writeable_pref_store.h"
  16
  17 // A basic PrefStore implementation that uses a simple name-value map for
  18 // storing the preference values.
  19 class BASE_PREFS_EXPORT ValueMapPrefStore : public WriteablePrefStore {
  20  public:
  21   ValueMapPrefStore();
  22
  23   // PrefStore overrides:
  24   bool GetValue(const std::string& key,
  25                 const base::Value** value) const override;
  26   void AddObserver(PrefStore::Observer* observer) override;
  27   void RemoveObserver(PrefStore::Observer* observer) override;
  28   bool HasObservers() const override;
  29
  30   // WriteablePrefStore overrides:
  31   void SetValue(const std::string& key, base::Value* value) override;
  32   void RemoveValue(const std::string& key) override;
  33   bool GetMutableValue(const std::string& key, base::Value** value) override;
  34   void ReportValueChanged(const std::string& key) override;
  35   void SetValueSilently(const std::string& key, base::Value* value) override;
  36
  37  protected:
  38   ~ValueMapPrefStore() override;
  39
  40   // Notify observers about the initialization completed event.
  41   void NotifyInitializationCompleted();
  42
  43  private:
  44   PrefValueMap prefs_;
  45
  46   ObserverList<PrefStore::Observer, true> observers_;
  47
  48   DISALLOW_COPY_AND_ASSIGN(ValueMapPrefStore);
  49 };
  50
  51 #endif  // BASE_PREFS_VALUE_MAP_PREF_STORE_H_