chrome/utility/web_resource_unpacker.h

   1 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 // This class is called by the WebResourceService in a sandboxed process
   6 // to unpack data retrieved from a web resource feed.  Right now, it
   7 // takes a string of data in JSON format, parses it, and hands it back
   8 // to the WebResourceService as a list of items.  In the future
   9 // it will be set up to unpack and verify image data in addition to
  10 // just parsing a JSON feed.
  11
  12 #ifndef CHROME_UTILITY_WEB_RESOURCE_UNPACKER_H_
  13 #define CHROME_UTILITY_WEB_RESOURCE_UNPACKER_H_
  14
  15 #include <string>
  16
  17 #include "base/basictypes.h"
  18 #include "base/memory/scoped_ptr.h"
  19
  20 namespace base {
  21 class DictionaryValue;
  22 }
  23
  24 class WebResourceUnpacker {
  25  public:
  26   static const char* kInvalidDataTypeError;
  27   static const char* kUnexpectedJSONFormatError;
  28
  29   explicit WebResourceUnpacker(const std::string &resource_data);
  30   ~WebResourceUnpacker();
  31
  32   // This does the actual parsing.  In case of an error, error_message_
  33   // is set to an appropriate value.
  34   bool Run();
  35
  36   // Returns the last error message set by Run().
  37   const std::string& error_message() { return error_message_; }
  38
  39   // Gets data which has been parsed by Run().
  40   base::DictionaryValue* parsed_json() {
  41     return parsed_json_.get();
  42   }
  43
  44  private:
  45   // Holds the string which is to be parsed.
  46   std::string resource_data_;
  47
  48   // Holds the result of JSON parsing of resource_data_.
  49   scoped_ptr<base::DictionaryValue> parsed_json_;
  50
  51   // Holds the last error message produced by Run().
  52   std::string error_message_;
  53
  54   DISALLOW_COPY_AND_ASSIGN(WebResourceUnpacker);
  55 };
  56
  57 #endif  // CHROME_UTILITY_WEB_RESOURCE_UNPACKER_H_