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104 lines
3.8 KiB
C++
104 lines
3.8 KiB
C++
// Copyright (c) 2012 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef BASE_JSON_JSON_FILE_VALUE_SERIALIZER_H_
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#define BASE_JSON_JSON_FILE_VALUE_SERIALIZER_H_
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#include <stddef.h>
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#include <string>
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#include "base/base_export.h"
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#include "base/files/file_path.h"
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#include "base/macros.h"
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#include "base/values.h"
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class BASE_EXPORT JSONFileValueSerializer : public base::ValueSerializer {
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public:
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// |json_file_path_| is the path of a file that will be destination of the
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// serialization. The serializer will attempt to create the file at the
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// specified location.
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explicit JSONFileValueSerializer(const base::FilePath& json_file_path);
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~JSONFileValueSerializer() override;
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// DO NOT USE except in unit tests to verify the file was written properly.
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// We should never serialize directly to a file since this will block the
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// thread. Instead, serialize to a string and write to the file you want on
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// the file thread.
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//
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// Attempt to serialize the data structure represented by Value into
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// JSON. If the return value is true, the result will have been written
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// into the file whose name was passed into the constructor.
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bool Serialize(const base::Value& root) override;
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// Equivalent to Serialize(root) except binary values are omitted from the
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// output.
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bool SerializeAndOmitBinaryValues(const base::Value& root);
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private:
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bool SerializeInternal(const base::Value& root, bool omit_binary_values);
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const base::FilePath json_file_path_;
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DISALLOW_IMPLICIT_CONSTRUCTORS(JSONFileValueSerializer);
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};
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class BASE_EXPORT JSONFileValueDeserializer : public base::ValueDeserializer {
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public:
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// |json_file_path_| is the path of a file that will be source of the
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// deserialization. |options| is a bitmask of JSONParserOptions.
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explicit JSONFileValueDeserializer(const base::FilePath& json_file_path,
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int options = 0);
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~JSONFileValueDeserializer() override;
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// Attempt to deserialize the data structure encoded in the file passed
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// in to the constructor into a structure of Value objects. If the return
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// value is NULL, and if |error_code| is non-null, |error_code| will
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// contain an integer error code (either JsonFileError or JsonParseError).
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// If |error_message| is non-null, it will be filled in with a formatted
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// error message including the location of the error if appropriate.
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// The caller takes ownership of the returned value.
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std::unique_ptr<base::Value> Deserialize(int* error_code,
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std::string* error_message) override;
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// This enum is designed to safely overlap with JSONReader::JsonParseError.
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enum JsonFileError {
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JSON_NO_ERROR = 0,
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JSON_ACCESS_DENIED = 1000,
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JSON_CANNOT_READ_FILE,
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JSON_FILE_LOCKED,
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JSON_NO_SUCH_FILE
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};
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// File-specific error messages that can be returned.
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static const char kAccessDenied[];
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static const char kCannotReadFile[];
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static const char kFileLocked[];
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static const char kNoSuchFile[];
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// Convert an error code into an error message. |error_code| is assumed to
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// be a JsonFileError.
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static const char* GetErrorMessageForCode(int error_code);
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// Returns the size (in bytes) of JSON string read from disk in the last
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// successful |Deserialize()| call.
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size_t get_last_read_size() const { return last_read_size_; }
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private:
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// A wrapper for ReadFileToString which returns a non-zero JsonFileError if
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// there were file errors.
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int ReadFileToString(std::string* json_string);
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const base::FilePath json_file_path_;
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const int options_;
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size_t last_read_size_;
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DISALLOW_IMPLICIT_CONSTRUCTORS(JSONFileValueDeserializer);
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};
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#endif // BASE_JSON_JSON_FILE_VALUE_SERIALIZER_H_
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