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// Copyright 2012 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef COMPONENTS_PREFS_DEFAULT_PREF_STORE_H_
#define COMPONENTS_PREFS_DEFAULT_PREF_STORE_H_
#include <memory>
#include <string_view>
#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 {
public:
typedef PrefValueMap::const_iterator const_iterator;
DefaultPrefStore();
DefaultPrefStore(const DefaultPrefStore&) = delete;
DefaultPrefStore& operator=(const DefaultPrefStore&) = delete;
// PrefStore implementation:
bool GetValue(std::string_view key,
const base::Value** result) const override;
base::Value::Dict 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(std::string_view key, base::Value value);
// Replaces the the value for `key` with a new value. Should only be called
// if a value has already been set; otherwise call SetDefaultValue().
void ReplaceDefaultValue(std::string_view key, base::Value value);
const_iterator begin() const;
const_iterator end() const;
private:
~DefaultPrefStore() override;
PrefValueMap prefs_;
base::ObserverList<PrefStore::Observer, true> observers_;
};
#endif // COMPONENTS_PREFS_DEFAULT_PREF_STORE_H_
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