chrome/installer/util/delete_reg_value_work_item.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 #ifndef CHROME_INSTALLER_UTIL_DELETE_REG_VALUE_WORK_ITEM_H_
   6 #define CHROME_INSTALLER_UTIL_DELETE_REG_VALUE_WORK_ITEM_H_
   7
   8 #include <windows.h>
   9
  10 #include <string>
  11
  12 #include "chrome/installer/util/work_item.h"
  13
  14 // A WorkItem subclass that deletes a registry value with REG_SZ, REG_DWORD, or
  15 // REG_QWORD type at the specified path. The value is only deleted if the target
  16 // key exists.
  17 class DeleteRegValueWorkItem : public WorkItem {
  18  public:
  19   virtual ~DeleteRegValueWorkItem();
  20
  21   virtual bool Do();
  22
  23   virtual void Rollback();
  24
  25  private:
  26   friend class WorkItem;
  27
  28   enum DeletionStatus {
  29     // The status before Do is called.
  30     DELETE_VALUE,
  31     // One possible outcome after Do(). Value is deleted.
  32     VALUE_DELETED,
  33     // One possible outcome after Do(). Value is not found.
  34     VALUE_NOT_FOUND,
  35     // The status after Do() and Rollback() is called.
  36     VALUE_ROLLED_BACK,
  37     // Another possible outcome after Do() (when there is an error).
  38     VALUE_UNCHANGED
  39   };
  40
  41   DeleteRegValueWorkItem(HKEY predefined_root, const std::wstring& key_path,
  42                          const std::wstring& value_name);
  43
  44   // Root key of the target key under which the value is set. The root key can
  45   // only be one of the predefined keys on Windows.
  46   HKEY predefined_root_;
  47
  48   // Path of the target key under which the value is set.
  49   std::wstring key_path_;
  50
  51   // Name of the value to be set.
  52   std::wstring value_name_;
  53
  54   DeletionStatus status_;
  55
  56   // Previous value.
  57   DWORD previous_type_;
  58   std::string previous_value_;
  59 };
  60
  61 #endif  // CHROME_INSTALLER_UTIL_DELETE_REG_VALUE_WORK_ITEM_H_