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// Copyright (c) 2011 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_PREF_VALUE_MAP_H_
#define COMPONENTS_PREFS_PREF_VALUE_MAP_H_
#include <memory>
#include <string>
#include <unordered_map>
#include <vector>
#include "base/macros.h"
#include "components/prefs/base_prefs_export.h"
namespace base {
class Value;
}
// A generic string to value map used by the PrefStore implementations.
class COMPONENTS_PREFS_EXPORT PrefValueMap {
public:
using Map = std::unordered_map<std::string, std::unique_ptr<base::Value>>;
using iterator = Map::iterator;
using const_iterator = Map::const_iterator;
PrefValueMap();
virtual ~PrefValueMap();
// Gets the value for |key| and stores it in |value|. Ownership remains with
// the map. Returns true if a value is present. If not, |value| is not
// touched.
bool GetValue(const std::string& key, const base::Value** value) const;
bool GetValue(const std::string& key, base::Value** value);
// Sets a new |value| for |key|. |value| must be non-null. Returns true if the
// value changed.
bool SetValue(const std::string& key, std::unique_ptr<base::Value> value);
// Removes the value for |key| from the map. Returns true if a value was
// removed.
bool RemoveValue(const std::string& key);
// Clears the map.
void Clear();
// Swaps the contents of two maps.
void Swap(PrefValueMap* other);
iterator begin();
iterator end();
const_iterator begin() const;
const_iterator end() const;
bool empty() const;
// Gets a boolean value for |key| and stores it in |value|. Returns true if
// the value was found and of the proper type.
bool GetBoolean(const std::string& key, bool* value) const;
// Sets the value for |key| to the boolean |value|.
void SetBoolean(const std::string& key, bool value);
// Gets a string value for |key| and stores it in |value|. Returns true if
// the value was found and of the proper type.
bool GetString(const std::string& key, std::string* value) const;
// Sets the value for |key| to the string |value|.
void SetString(const std::string& key, const std::string& value);
// Gets an int value for |key| and stores it in |value|. Returns true if
// the value was found and of the proper type.
bool GetInteger(const std::string& key, int* value) const;
// Sets the value for |key| to the int |value|.
void SetInteger(const std::string& key, const int value);
// Sets the value for |key| to the double |value|.
void SetDouble(const std::string& key, const double value);
// Compares this value map against |other| and stores all key names that have
// different values in |differing_keys|. This includes keys that are present
// only in one of the maps.
void GetDifferingKeys(const PrefValueMap* other,
std::vector<std::string>* differing_keys) const;
private:
Map prefs_;
DISALLOW_COPY_AND_ASSIGN(PrefValueMap);
};
#endif // COMPONENTS_PREFS_PREF_VALUE_MAP_H_
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