delete_reg_value_work_item.h revision cedac228d2dd51db4b79ea1e72c7f249408ee061 
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.
17class 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,
42                         const std::wstring& key_path,
43                         REGSAM wow64_acccess,
44                         const std::wstring& value_name);
45
46  // Root key of the target key under which the value is set. The root key can
47  // only be one of the predefined keys on Windows.
48  HKEY predefined_root_;
49
50  // Path of the target key under which the value is set.
51  std::wstring key_path_;
52
53  // Name of the value to be set.
54  std::wstring value_name_;
55
56  // Whether to force 32-bit or 64-bit view of the target key.
57  REGSAM wow64_access_;
58
59  DeletionStatus status_;
60
61  // Previous value.
62  DWORD previous_type_;
63  std::string previous_value_;
64};
65
66#endif  // CHROME_INSTALLER_UTIL_DELETE_REG_VALUE_WORK_ITEM_H_
67