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work_item.h

// Copyright (c) 2009 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.
//
// Base class for managing an action of a sequence of actions to be carried
// out during install/update/uninstall. Supports rollback of actions if this
// process fails.

#ifndef CHROME_INSTALLER_UTIL_WORK_ITEM_H_
#define CHROME_INSTALLER_UTIL_WORK_ITEM_H_

#include <windows.h>
#include <string>

#include "base/file_path.h"

class CopyTreeWorkItem;
class CreateDirWorkItem;
class CreateRegKeyWorkItem;
class DeleteTreeWorkItem;
class DeleteRegValueWorkItem;
class MoveTreeWorkItem;
class SelfRegWorkItem;
class SetRegValueWorkItem;
class WorkItemList;

// A base class that defines APIs to perform/rollback an action or a
// sequence of actions during install/update/uninstall.
class WorkItem {
 public:
  // Possible states
  typedef enum CopyOverWriteOption {
    ALWAYS,  // Always overwrite regardless of what existed before.
    NEVER,  // Not used currently.
    IF_DIFFERENT,  // Overwrite if different. Currently only applies to file.
    IF_NOT_PRESENT,  // Copy only if file/directory do not exist already.
    NEW_NAME_IF_IN_USE  // Copy to a new path if dest is in use(only files).
  };

  virtual ~WorkItem();

  // Create a CopyTreeWorkItem that recursively copies a file system hierarchy
  // from source path to destination path.
  // * If overwrite_option is ALWAYS, the created CopyTreeWorkItem always
  //   overwrites files.
  // * If overwrite_option is NEW_NAME_IF_IN_USE, file is copied with an
  //   alternate name specified by alternative_path.
  static CopyTreeWorkItem* CreateCopyTreeWorkItem(
      const std::wstring& source_path,
      const std::wstring& dest_path,
      const std::wstring& temp_dir,
      CopyOverWriteOption overwrite_option,
      const std::wstring& alternative_path = L"");

  // Create a CreateDirWorkItem that creates a directory at the given path.
  static CreateDirWorkItem* CreateCreateDirWorkItem(const FilePath& path);

  // Create a CreateRegKeyWorkItem that creates a registry key at the given
  // path.
  static CreateRegKeyWorkItem* CreateCreateRegKeyWorkItem(
      HKEY predefined_root, const std::wstring& path);

  // Create a DeleteRegValueWorkItem that deletes a registry value
  static DeleteRegValueWorkItem* CreateDeleteRegValueWorkItem(
      HKEY predefined_root,
      const std::wstring& key_path,
      const std::wstring& value_name,
      bool is_str_type);

  // Create a DeleteTreeWorkItem that recursively deletes a file system
  // hierarchy at the given root path. A key file can be optionally specified
  // by key_path.
  static DeleteTreeWorkItem* CreateDeleteTreeWorkItem(
      const std::wstring& root_path, const std::wstring& key_path);

  // Create a MoveTreeWorkItem that recursively moves a file system hierarchy
  // from source path to destination path.
  static MoveTreeWorkItem* CreateMoveTreeWorkItem(
      const std::wstring& source_path,
      const std::wstring& dest_path,
      const std::wstring& temp_dir);

  // Create a SetRegValueWorkItem that sets a registry value with REG_SZ type
  // at the key with specified path.
  static SetRegValueWorkItem* CreateSetRegValueWorkItem(
      HKEY predefined_root,
      const std::wstring& key_path,
      const std::wstring& value_name,
      const std::wstring& value_data,
      bool overwrite);

  // Create a SetRegValueWorkItem that sets a registry value with REG_DWORD type
  // at the key with specified path.
  static SetRegValueWorkItem* CreateSetRegValueWorkItem(
      HKEY predefined_root,
      const std::wstring& key_path,
      const std::wstring& value_name,
      DWORD value_data, bool overwrite);

  // Add a SelfRegWorkItem that registers or unregisters a DLL at the
  // specified path.
  static SelfRegWorkItem* CreateSelfRegWorkItem(const std::wstring& dll_path,
                                                bool do_register);

  // Create an empty WorkItemList. A WorkItemList can recursively contains
  // a list of WorkItems.
  static WorkItemList* CreateWorkItemList();

  // Perform the actions of WorkItem. Returns true if success, returns false
  // otherwise.
  // If the WorkItem is transactional, then Do() is done as a transaction.
  // If it returns false, there will be no change on the system.
  virtual bool Do() = 0;

  // Rollback any actions previously carried out by this WorkItem. If the
  // WorkItem is transactional, then the previous actions can be fully
  // rolled back. If the WorkItem is non-transactional, the rollback is a
  // best effort.
  virtual void Rollback() = 0;

  // Return true if the WorkItem is transactional, return false if
  // non-transactional.
  virtual bool IsTransactional() { return false; }

  // For diagnostics.
  virtual std::wstring Dump();

 protected:
  WorkItem();
};

#endif  // CHROME_INSTALLER_UTIL_WORK_ITEM_H_

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