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// Copyright (c) 2006-2008 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 CHROME_INSTALLER_UTIL_DELETE_REG_VALUE_WORK_ITEM_H_
#define CHROME_INSTALLER_UTIL_DELETE_REG_VALUE_WORK_ITEM_H_
#include <string>
#include <windows.h>
#include "chrome/installer/util/work_item.h"
// A WorkItem subclass that sets a registry value with REG_SZ or REG_DWORD
// type at the specified path. The value is only set if the target key exists.
class DeleteRegValueWorkItem : public WorkItem {
public:
virtual ~DeleteRegValueWorkItem();
virtual bool Do();
virtual void Rollback();
private:
friend class WorkItem;
enum DeletionStatus {
// The status before Do is called.
DELETE_VALUE,
// One possible outcome after Do(). Value is deleted.
VALUE_DELETED,
// One possible outcome after Do(). Value is not found.
VALUE_NOT_FOUND,
// The status after Do() and Rollback() is called.
VALUE_ROLLED_BACK,
// Another possible outcome after Do() (when there is an error).
VALUE_UNCHANGED
};
DeleteRegValueWorkItem(HKEY predefined_root, std::wstring key_path,
std::wstring value_name, bool is_str_type);
// Root key of the target key under which the value is set. The root key can
// only be one of the predefined keys on Windows.
HKEY predefined_root_;
// Path of the target key under which the value is set.
std::wstring key_path_;
// Name of the value to be set.
std::wstring value_name_;
// boolean that tells whether data value is of type REG_SZ or REG_DWORD.
// Ideally we do not need this information from user of this class and can
// check the registry for the type. But to simpify implementation we are
// going to put the burden on the caller for now to provide us the type.
bool is_str_type_;
DeletionStatus status_;
// Data of the previous value.
std::wstring old_str_; // if data is of type REG_SZ
DWORD old_dw_; // if data is of type REG_DWORD
};
#endif // CHROME_INSTALLER_UTIL_DELETE_REG_VALUE_WORK_ITEM_H_
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