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      1 // Copyright 2014 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_BROWSER_CHROMEOS_FILE_MANAGER_SNAPSHOT_MANAGER_H_
      6 #define CHROME_BROWSER_CHROMEOS_FILE_MANAGER_SNAPSHOT_MANAGER_H_
      7 
      8 #include <vector>
      9 
     10 #include "base/callback_forward.h"
     11 #include "base/files/file.h"
     12 #include "base/memory/ref_counted.h"
     13 #include "base/memory/weak_ptr.h"
     14 
     15 class Profile;
     16 
     17 namespace base {
     18 class FilePath;
     19 }  // namespace base
     20 
     21 namespace webkit_blob {
     22 class ShareableFileReference;
     23 }  // namespace webkit_blob
     24 
     25 namespace file_manager {
     26 
     27 // Utility class for creating a snapshot of a file system file on local disk.
     28 // The class wraps the underlying implementation of fileapi's CreateSnapshotFile
     29 // and prolongs the lifetime of snapshot files so that the client code that just
     30 // accepts file paths works without problems.
     31 class SnapshotManager {
     32  public:
     33   // The callback type for CreateManagedSnapshot.
     34   typedef base::Callback<void(const base::FilePath&)> LocalPathCallback;
     35 
     36   explicit SnapshotManager(Profile* profile);
     37   ~SnapshotManager();
     38 
     39   // Creates a snapshot file copy of a file system file |absolute_file_path| and
     40   // returns back to |callback|. Returns empty path for failure.
     41   void CreateManagedSnapshot(const base::FilePath& absolute_file_path,
     42                              const LocalPathCallback& callback);
     43 
     44  private:
     45   // Part of CreateManagedSnapshot.
     46   void OnCreateSnapshotFile(
     47       const LocalPathCallback& callback,
     48       base::File::Error result,
     49       const base::File::Info& file_info,
     50       const base::FilePath& platform_path,
     51       const scoped_refptr<webkit_blob::ShareableFileReference>& file_ref);
     52 
     53   Profile* profile_;
     54   std::vector<scoped_refptr<webkit_blob::ShareableFileReference> > file_refs_;
     55 
     56   // Note: This should remain the last member so it'll be destroyed and
     57   // invalidate the weak pointers before any other members are destroyed.
     58   base::WeakPtrFactory<SnapshotManager> weak_ptr_factory_;
     59   DISALLOW_COPY_AND_ASSIGN(SnapshotManager);
     60 };
     61 
     62 }  // namespace file_manager
     63 
     64 #endif  // CHROME_BROWSER_CHROMEOS_FILE_MANAGER_SNAPSHOT_MANAGER_H_
     65