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_store.h"
  15 #include "base/prefs/pref_value_map.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 PrefStore {
  20  public:
  21   ValueMapPrefStore();
  22
  23   // PrefStore overrides:
  24   virtual bool GetValue(const std::string& key,
  25                         const base::Value** value) const OVERRIDE;
  26   virtual void AddObserver(PrefStore::Observer* observer) OVERRIDE;
  27   virtual void RemoveObserver(PrefStore::Observer* observer) OVERRIDE;
  28   virtual size_t NumberOfObservers() const OVERRIDE;
  29
  30  protected:
  31   virtual ~ValueMapPrefStore();
  32
  33   // Store a |value| for |key| in the store. Also generates an notification if
  34   // the value changed. Assumes ownership of |value|, which must be non-NULL.
  35   void SetValue(const std::string& key, base::Value* value);
  36
  37   // Remove the value for |key| from the store. Sends a notification if there
  38   // was a value to be removed.
  39   void RemoveValue(const std::string& key);
  40
  41   // Notify observers about the initialization completed event.
  42   void NotifyInitializationCompleted();
  43
  44  private:
  45   PrefValueMap prefs_;
  46
  47   ObserverList<PrefStore::Observer, true> observers_;
  48
  49   DISALLOW_COPY_AND_ASSIGN(ValueMapPrefStore);
  50 };
  51
  52 #endif  // BASE_PREFS_VALUE_MAP_PREF_STORE_H_