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// 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.
#ifndef BASE_PREFS_DEFAULT_PREF_STORE_H_
#define BASE_PREFS_DEFAULT_PREF_STORE_H_
#include <string>
#include "base/observer_list.h"
#include "base/prefs/base_prefs_export.h"
#include "base/prefs/pref_store.h"
#include "base/prefs/pref_value_map.h"
#include "base/values.h"
// Used within a PrefRegistry to keep track of default preference values.
class BASE_PREFS_EXPORT DefaultPrefStore : public PrefStore {
public:
typedef PrefValueMap::const_iterator const_iterator;
DefaultPrefStore();
// PrefStore implementation:
virtual bool GetValue(const std::string& key,
const base::Value** result) const OVERRIDE;
virtual void AddObserver(PrefStore::Observer* observer) OVERRIDE;
virtual void RemoveObserver(PrefStore::Observer* observer) OVERRIDE;
virtual 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, scoped_ptr<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,
scoped_ptr<base::Value> value);
const_iterator begin() const;
const_iterator end() const;
private:
virtual ~DefaultPrefStore();
PrefValueMap prefs_;
ObserverList<PrefStore::Observer, true> observers_;
DISALLOW_COPY_AND_ASSIGN(DefaultPrefStore);
};
#endif // BASE_PREFS_DEFAULT_PREF_STORE_H_
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