blob: 17ba3ec7a5b6e2719da043b9d7123c2355186932 [file] [log] [blame]
// 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.
#include <memory>
#include <string>
#include "base/macros.h"
#include "base/observer_list.h"
#include "base/values.h"
#include "components/prefs/pref_store.h"
#include "components/prefs/pref_value_map.h"
#include "components/prefs/prefs_export.h"
// Used within a PrefRegistry to keep track of default preference values.
class COMPONENTS_PREFS_EXPORT DefaultPrefStore : public PrefStore {
typedef PrefValueMap::const_iterator const_iterator;
// PrefStore implementation:
bool GetValue(const std::string& key,
const base::Value** result) const override;
std::unique_ptr<base::DictionaryValue> GetValues() 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, 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, base::Value value);
const_iterator begin() const;
const_iterator end() const;
~DefaultPrefStore() override;
PrefValueMap prefs_;
base::ObserverList<PrefStore::Observer, true>::Unchecked observers_;