chrome/installer/util/delete_tree_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_TREE_WORK_ITEM_H_
   6 #define CHROME_INSTALLER_UTIL_DELETE_TREE_WORK_ITEM_H_
   7
   8 #include <vector>
   9
  10 #include "base/files/file_path.h"
  11 #include "base/files/scoped_temp_dir.h"
  12 #include "base/memory/scoped_ptr.h"
  13 #include "chrome/installer/util/work_item.h"
  14
  15 // A WorkItem subclass that recursively deletes a file system hierarchy at the
  16 // given root path. The file system hierarchy could be a single file, or a
  17 // directory.
  18 // The file system hierarchy to be deleted can have one or more key files. If
  19 // specified, deletion will be performed only if all key files are not in use.
  20 class DeleteTreeWorkItem : public WorkItem {
  21  public:
  22   virtual ~DeleteTreeWorkItem();
  23
  24   virtual bool Do();
  25
  26   virtual void Rollback();
  27
  28  private:
  29   friend class WorkItem;
  30
  31   DeleteTreeWorkItem(const base::FilePath& root_path,
  32                      const base::FilePath& temp_path,
  33                      const std::vector<base::FilePath>& key_paths);
  34
  35   // Root path to delete.
  36   base::FilePath root_path_;
  37
  38   // Temporary directory that can be used.
  39   base::FilePath temp_path_;
  40
  41   // The number of key files.
  42   ptrdiff_t num_key_files_;
  43
  44   // Contains the paths to the key files. If specified, deletion will be
  45   // performed only if none of the key files are in use.
  46   scoped_ptr<base::FilePath[]> key_paths_;
  47
  48   // Contains the temp directories for the backed-up key files. The directories
  49   // are created and populated in Do() as-needed. We don't use a standard
  50   // container for this since base::ScopedTempDir isn't CopyConstructible.
  51   scoped_ptr<base::ScopedTempDir[]> key_backup_paths_;
  52
  53   // The temporary directory into which the original root_path_ has been moved.
  54   base::ScopedTempDir backup_path_;
  55
  56   // Set to true once root_path_ has been copied into backup_path_.
  57   bool copied_to_backup_;
  58 };
  59
  60 #endif  // CHROME_INSTALLER_UTIL_DELETE_TREE_WORK_ITEM_H_