Break two classes defined in json_value_serializer.cc, .h into separate files.

base/json/json_value_serializer.h

-// 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 BASE_JSON_JSON_VALUE_SERIALIZER_H_
-#define BASE_JSON_JSON_VALUE_SERIALIZER_H_
-#pragma once
-
-#include <string>
-
-#include "base/base_export.h"
-#include "base/basictypes.h"
-#include "base/file_path.h"
-#include "base/values.h"
-
-class BASE_EXPORT JSONStringValueSerializer : public base::ValueSerializer {
- public:
-  // json_string is the string that will be source of the deserialization
-  // or the destination of the serialization.  The caller of the constructor
-  // retains ownership of the string.
-  explicit JSONStringValueSerializer(std::string* json_string)
-      : json_string_(json_string),
-        initialized_with_const_string_(false),
-        pretty_print_(false),
-        allow_trailing_comma_(false) {
-  }
-
-  // This version allows initialization with a const string reference for
-  // deserialization only.
-  explicit JSONStringValueSerializer(const std::string& json_string)
-      : json_string_(&const_cast<std::string&>(json_string)),
-        initialized_with_const_string_(true),
-        pretty_print_(false),
-        allow_trailing_comma_(false) {
-  }
-
-  virtual ~JSONStringValueSerializer();
-
-  // Attempt to serialize the data structure represented by Value into
-  // JSON.  If the return value is true, the result will have been written
-  // into the string passed into the constructor.
-  virtual bool Serialize(const Value& root) OVERRIDE;
-
-  // Equivalent to Serialize(root) except binary values are omitted from the
-  // output.
-  bool SerializeAndOmitBinaryValues(const Value& root);
-
-  // Attempt to deserialize the data structure encoded in the string passed
-  // in to the constructor into a structure of Value objects.  If the return
-  // value is NULL, and if |error_code| is non-null, |error_code| will
-  // contain an integer error code (either JsonFileError or JsonParseError).
-  // If |error_message| is non-null, it will be filled in with a formatted
-  // error message including the location of the error if appropriate.
-  // The caller takes ownership of the returned value.
-  virtual Value* Deserialize(int* error_code,
-                             std::string* error_message) OVERRIDE;
-
-  void set_pretty_print(bool new_value) { pretty_print_ = new_value; }
-  bool pretty_print() { return pretty_print_; }
-
-  void set_allow_trailing_comma(bool new_value) {
-    allow_trailing_comma_ = new_value;
-  }
-
- private:
-  bool SerializeInternal(const Value& root, bool omit_binary_values);
-
-  std::string* json_string_;
-  bool initialized_with_const_string_;
-  bool pretty_print_;  // If true, serialization will span multiple lines.
-  // If true, deserialization will allow trailing commas.
-  bool allow_trailing_comma_;
-
-  DISALLOW_COPY_AND_ASSIGN(JSONStringValueSerializer);
-};
-
-class BASE_EXPORT JSONFileValueSerializer : public base::ValueSerializer {
- public:
-  // json_file_patch is the path of a file that will be source of the
-  // deserialization or the destination of the serialization.
-  // When deserializing, the file should exist, but when serializing, the
-  // serializer will attempt to create the file at the specified location.
-  explicit JSONFileValueSerializer(const FilePath& json_file_path)
-    : json_file_path_(json_file_path),
-      allow_trailing_comma_(false) {}
-
-  virtual ~JSONFileValueSerializer() {}
-
-  // DO NOT USE except in unit tests to verify the file was written properly.
-  // We should never serialize directly to a file since this will block the
-  // thread. Instead, serialize to a string and write to the file you want on
-  // the file thread.
-  //
-  // Attempt to serialize the data structure represented by Value into
-  // JSON.  If the return value is true, the result will have been written
-  // into the file whose name was passed into the constructor.
-  virtual bool Serialize(const Value& root) OVERRIDE;
-
-  // Equivalent to Serialize(root) except binary values are omitted from the
-  // output.
-  bool SerializeAndOmitBinaryValues(const Value& root);
-
-  // Attempt to deserialize the data structure encoded in the file passed
-  // in to the constructor into a structure of Value objects.  If the return
-  // value is NULL, and if |error_code| is non-null, |error_code| will
-  // contain an integer error code (either JsonFileError or JsonParseError).
-  // If |error_message| is non-null, it will be filled in with a formatted
-  // error message including the location of the error if appropriate.
-  // The caller takes ownership of the returned value.
-  virtual Value* Deserialize(int* error_code,
-                             std::string* error_message) OVERRIDE;
-
-  // This enum is designed to safely overlap with JSONReader::JsonParseError.
-  enum JsonFileError {
-    JSON_NO_ERROR = 0,
-    JSON_ACCESS_DENIED = 1000,
-    JSON_CANNOT_READ_FILE,
-    JSON_FILE_LOCKED,
-    JSON_NO_SUCH_FILE
-  };
-
-  // File-specific error messages that can be returned.
-  static const char* kAccessDenied;
-  static const char* kCannotReadFile;
-  static const char* kFileLocked;
-  static const char* kNoSuchFile;
-
-  // Convert an error code into an error message.  |error_code| is assumed to
-  // be a JsonFileError.
-  static const char* GetErrorMessageForCode(int error_code);
-
-  void set_allow_trailing_comma(bool new_value) {
-    allow_trailing_comma_ = new_value;
-  }
-
- private:
-  bool SerializeInternal(const Value& root, bool omit_binary_values);
-
-  FilePath json_file_path_;
-  bool allow_trailing_comma_;
-
-  // A wrapper for file_util::ReadFileToString which returns a non-zero
-  // JsonFileError if there were file errors.
-  int ReadFileToString(std::string* json_string);
-
-  DISALLOW_IMPLICIT_CONSTRUCTORS(JSONFileValueSerializer);
-};
-
-#endif  // BASE_JSON_JSON_VALUE_SERIALIZER_H_