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_DEFAULT_PREF_STORE_H_ 6 #define BASE_PREFS_DEFAULT_PREF_STORE_H_ 7 8 #include <string> 9 10 #include "base/observer_list.h" 11 #include "base/prefs/base_prefs_export.h" 12 #include "base/prefs/pref_store.h" 13 #include "base/prefs/pref_value_map.h" 14 #include "base/values.h" 15 16 // Used within a PrefRegistry to keep track of default preference values. 17 class BASE_PREFS_EXPORT DefaultPrefStore : public PrefStore { 18 public: 19 typedef PrefValueMap::const_iterator const_iterator; 20 21 DefaultPrefStore(); 22 23 // PrefStore implementation: 24 virtual bool GetValue(const std::string& key, 25 const base::Value** result) const OVERRIDE; 26 virtual void AddObserver(PrefStore::Observer* observer) OVERRIDE; 27 virtual void RemoveObserver(PrefStore::Observer* observer) OVERRIDE; 28 virtual bool HasObservers() const OVERRIDE; 29 30 // Sets a |value| for |key|. Should only be called if a value has not been 31 // set yet; otherwise call ReplaceDefaultValue(). 32 void SetDefaultValue(const std::string& key, scoped_ptr<base::Value> value); 33 34 // Replaces the the value for |key| with a new value. Should only be called 35 // if a value has alreday been set; otherwise call SetDefaultValue(). 36 void ReplaceDefaultValue(const std::string& key, 37 scoped_ptr<base::Value> value); 38 39 const_iterator begin() const; 40 const_iterator end() const; 41 42 private: 43 virtual ~DefaultPrefStore(); 44 45 PrefValueMap prefs_; 46 47 ObserverList<PrefStore::Observer, true> observers_; 48 49 DISALLOW_COPY_AND_ASSIGN(DefaultPrefStore); 50 }; 51 52 #endif // BASE_PREFS_DEFAULT_PREF_STORE_H_ 53
