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// Copyright 2016 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_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/observer_list.h"
#include "base/strings/string_piece.h"
#include "base/values.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();
InMemoryPrefStore(const InMemoryPrefStore&) = delete;
InMemoryPrefStore& operator=(const InMemoryPrefStore&) = delete;
// PrefStore implementation.
bool GetValue(base::StringPiece 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;
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,
base::Value value,
uint32_t flags) override;
void SetValueSilently(const std::string& key,
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 SchedulePendingLossyWrites() override {}
void OnStoreDeletionFromDisk() override {}
bool IsInMemoryPrefStore() const override;
void RemoveValuesByPrefixSilently(const std::string& prefix) override;
protected:
~InMemoryPrefStore() override;
private:
// Stores the preference values.
PrefValueMap prefs_;
base::ObserverList<PrefStore::Observer, true>::Unchecked observers_;
};
#endif // COMPONENTS_PREFS_IN_MEMORY_PREF_STORE_H_
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