// 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 #include "base/basictypes.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); virtual ~JsonPrefStore(); // 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 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 bool ReadOnly() const OVERRIDE; virtual PrefReadError ReadPrefs() OVERRIDE; virtual void ReadPrefsAsync(ReadErrorDelegate* error_delegate) OVERRIDE; virtual bool WritePrefs() OVERRIDE; virtual void ScheduleWritePrefs() 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: // ImportantFileWriter::DataSerializer overrides: virtual bool SerializeData(std::string* output) OVERRIDE; FilePath path_; scoped_refptr file_message_loop_proxy_; scoped_ptr prefs_; bool read_only_; // Helper for safely writing pref data. ImportantFileWriter writer_; ObserverList observers_; scoped_ptr error_delegate_; bool initialized_; DISALLOW_COPY_AND_ASSIGN(JsonPrefStore); }; #endif // CHROME_COMMON_JSON_PREF_STORE_H_