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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 CHROME_COMMON_JSON_PREF_STORE_H_
#define CHROME_COMMON_JSON_PREF_STORE_H_
#pragma once
#include <string>
#include "base/basictypes.h"
#include "base/file_path.h"
#include "base/observer_list.h"
#include "base/scoped_ptr.h"
#include "chrome/common/important_file_writer.h"
#include "chrome/common/persistent_pref_store.h"
namespace base {
class MessageLoopProxy;
}
class DictionaryValue;
class FilePath;
class Value;
// A writable PrefStore implementation that is used for user preferences.
class JsonPrefStore : public PersistentPrefStore,
public ImportantFileWriter::DataSerializer {
public:
// |file_message_loop_proxy| is the MessageLoopProxy for a thread on which
// file I/O can be done.
JsonPrefStore(const FilePath& pref_filename,
base::MessageLoopProxy* file_message_loop_proxy);
virtual ~JsonPrefStore();
// PrefStore overrides:
virtual ReadResult GetValue(const std::string& key,
const Value** result) const;
virtual void AddObserver(PrefStore::Observer* observer);
virtual void RemoveObserver(PrefStore::Observer* observer);
// PersistentPrefStore overrides:
virtual ReadResult GetMutableValue(const std::string& key, Value** result);
virtual void SetValue(const std::string& key, Value* value);
virtual void SetValueSilently(const std::string& key, Value* value);
virtual void RemoveValue(const std::string& key);
virtual bool ReadOnly() const;
virtual PrefReadError ReadPrefs();
virtual bool WritePrefs();
virtual void ScheduleWritePrefs();
virtual void CommitPendingWrite();
virtual void ReportValueChanged(const std::string& key);
private:
// ImportantFileWriter::DataSerializer overrides:
virtual bool SerializeData(std::string* output);
FilePath path_;
scoped_ptr<DictionaryValue> prefs_;
bool read_only_;
// Helper for safely writing pref data.
ImportantFileWriter writer_;
ObserverList<PrefStore::Observer, true> observers_;
DISALLOW_COPY_AND_ASSIGN(JsonPrefStore);
};
#endif // CHROME_COMMON_JSON_PREF_STORE_H_
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