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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 CHROME_COMMON_JSON_PREF_STORE_H_
#define CHROME_COMMON_JSON_PREF_STORE_H_
#pragma once
#include <set>
#include <string>
#include "base/basictypes.h"
#include "base/compiler_specific.h"
#include "base/file_path.h"
#include "base/memory/scoped_ptr.h"
#include "base/observer_list.h"
#include "chrome/common/important_file_writer.h"
#include "chrome/common/persistent_pref_store.h"
namespace base {
class DictionaryValue;
class MessageLoopProxy;
class Value;
}
class FilePath;
// 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);
// PrefStore overrides:
virtual ReadResult 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 size_t NumberOfObservers() const OVERRIDE;
virtual bool IsInitializationComplete() const OVERRIDE;
// PersistentPrefStore overrides:
virtual ReadResult GetMutableValue(const std::string& key,
base::Value** result) OVERRIDE;
virtual void SetValue(const std::string& key, base::Value* value) OVERRIDE;
virtual void SetValueSilently(const std::string& key,
base::Value* value) OVERRIDE;
virtual void RemoveValue(const std::string& key) OVERRIDE;
virtual void MarkNeedsEmptyValue(const std::string& key) OVERRIDE;
virtual bool ReadOnly() const OVERRIDE;
virtual PrefReadError GetReadError() const OVERRIDE;
virtual PrefReadError ReadPrefs() OVERRIDE;
virtual void ReadPrefsAsync(ReadErrorDelegate* error_delegate) OVERRIDE;
virtual void CommitPendingWrite() OVERRIDE;
virtual void ReportValueChanged(const std::string& key) OVERRIDE;
// This method is called after JSON file has been read. Method takes
// ownership of the |value| pointer. Note, this method is used with
// asynchronous file reading, so class exposes it only for the internal needs.
// (read: do not call it manually).
void OnFileRead(base::Value* value_owned, PrefReadError error, bool no_dir);
private:
virtual ~JsonPrefStore();
// ImportantFileWriter::DataSerializer overrides:
virtual bool SerializeData(std::string* output) OVERRIDE;
FilePath path_;
scoped_refptr<base::MessageLoopProxy> file_message_loop_proxy_;
scoped_ptr<base::DictionaryValue> prefs_;
bool read_only_;
// Helper for safely writing pref data.
ImportantFileWriter writer_;
ObserverList<PrefStore::Observer, true> observers_;
scoped_ptr<ReadErrorDelegate> error_delegate_;
bool initialized_;
PrefReadError read_error_;
std::set<std::string> keys_need_empty_value_;
DISALLOW_COPY_AND_ASSIGN(JsonPrefStore);
};
#endif // CHROME_COMMON_JSON_PREF_STORE_H_
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