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// Copyright (c) 2016 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 COMPONENTS_PREFS_IN_MEMORY_PREF_STORE_H_
#define COMPONENTS_PREFS_IN_MEMORY_PREF_STORE_H_
#include <stdint.h>
#include <string>
#include "base/compiler_specific.h"
#include "base/macros.h"
#include "base/observer_list.h"
#include "components/prefs/persistent_pref_store.h"
#include "components/prefs/pref_value_map.h"
// A light-weight prefstore implementation that keeps preferences
// in a memory backed store. This is not a persistent prefstore -- we
// subclass the PersistentPrefStore here since it is needed by the
// PrefService, which in turn is needed by various components.
class COMPONENTS_PREFS_EXPORT InMemoryPrefStore : public PersistentPrefStore {
public:
InMemoryPrefStore();
// 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;
bool IsInitializationComplete() const override;
// PersistentPrefStore implementation.
bool GetMutableValue(const std::string& key, base::Value** result) override;
void ReportValueChanged(const std::string& key, uint32_t flags) override;
void SetValue(const std::string& key,
std::unique_ptr<base::Value> value,
uint32_t flags) override;
void SetValueSilently(const std::string& key,
std::unique_ptr<base::Value> value,
uint32_t flags) override;
void RemoveValue(const std::string& key, uint32_t flags) override;
bool ReadOnly() const override;
PrefReadError GetReadError() const override;
PersistentPrefStore::PrefReadError ReadPrefs() override;
void ReadPrefsAsync(ReadErrorDelegate* error_delegate) override {}
void CommitPendingWrite() override {}
void SchedulePendingLossyWrites() override {}
void ClearMutableValues() override {}
protected:
~InMemoryPrefStore() override;
private:
// Stores the preference values.
PrefValueMap prefs_;
base::ObserverList<PrefStore::Observer, true> observers_;
DISALLOW_COPY_AND_ASSIGN(InMemoryPrefStore);
};
#endif // COMPONENTS_PREFS_IN_MEMORY_PREF_STORE_H_
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