| // Copyright (c) 2012 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #ifndef BASE_PREFS_DEFAULT_PREF_STORE_H_ |
| #define BASE_PREFS_DEFAULT_PREF_STORE_H_ |
| |
| #include <string> |
| |
| #include "base/observer_list.h" |
| #include "base/prefs/base_prefs_export.h" |
| #include "base/prefs/pref_store.h" |
| #include "base/prefs/pref_value_map.h" |
| #include "base/values.h" |
| |
| // Used within a PrefRegistry to keep track of default preference values. |
| class BASE_PREFS_EXPORT DefaultPrefStore : public PrefStore { |
| public: |
| typedef PrefValueMap::const_iterator const_iterator; |
| |
| DefaultPrefStore(); |
| |
| // PrefStore implementation: |
| bool GetValue(const std::string& key, |
| const base::Value** result) const override; |
| void AddObserver(PrefStore::Observer* observer) override; |
| void RemoveObserver(PrefStore::Observer* observer) override; |
| bool HasObservers() const override; |
| |
| // Sets a |value| for |key|. Should only be called if a value has not been |
| // set yet; otherwise call ReplaceDefaultValue(). |
| void SetDefaultValue(const std::string& key, scoped_ptr<base::Value> value); |
| |
| // Replaces the the value for |key| with a new value. Should only be called |
| // if a value has alreday been set; otherwise call SetDefaultValue(). |
| void ReplaceDefaultValue(const std::string& key, |
| scoped_ptr<base::Value> value); |
| |
| const_iterator begin() const; |
| const_iterator end() const; |
| |
| private: |
| ~DefaultPrefStore() override; |
| |
| PrefValueMap prefs_; |
| |
| base::ObserverList<PrefStore::Observer, true> observers_; |
| |
| DISALLOW_COPY_AND_ASSIGN(DefaultPrefStore); |
| }; |
| |
| #endif // BASE_PREFS_DEFAULT_PREF_STORE_H_ |