chrome/browser/media_galleries/linux/mtp_device_object_enumerator.h

   1 // Copyright (c) 2012 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_MEDIA_GALLERIES_LINUX_MTP_DEVICE_OBJECT_ENUMERATOR_H_
   6 #define CHROME_BROWSER_MEDIA_GALLERIES_LINUX_MTP_DEVICE_OBJECT_ENUMERATOR_H_
   7
   8 #include <vector>
   9
  10 #include "base/files/file_path.h"
  11 #include "base/time/time.h"
  12 #include "device/media_transfer_protocol/mtp_file_entry.pb.h"
  13
  14 // Used to enumerate top-level files of an media file system.
  15 class MTPDeviceObjectEnumerator {
  16  public:
  17   explicit MTPDeviceObjectEnumerator(const std::vector<MtpFileEntry>& entries);
  18
  19   ~MTPDeviceObjectEnumerator();
  20
  21   base::FilePath Next();
  22   int64 Size();
  23   bool IsDirectory();
  24   base::Time LastModifiedTime();
  25
  26   // If the current file entry is valid, returns true and fills in |entry_id|
  27   // with the entry identifier else returns false and |entry_id| is not set.
  28   bool GetEntryId(uint32_t* entry_id) const;
  29
  30  private:
  31   // Returns true if the enumerator has more entries to traverse, false
  32   // otherwise.
  33   bool HasMoreEntries() const;
  34
  35   // Returns true if Next() has been called at least once, and the enumerator
  36   // has more entries to traverse.
  37   bool IsIndexReadyAndInRange() const;
  38
  39   // List of directory file entries information.
  40   const std::vector<MtpFileEntry> file_entries_;
  41
  42   // Index into |file_entries_|.
  43   // Should only be used when |is_index_ready_| is true.
  44   size_t index_;
  45
  46   // Initially false. Set to true after Next() has been called.
  47   bool is_index_ready_;
  48
  49   DISALLOW_COPY_AND_ASSIGN(MTPDeviceObjectEnumerator);
  50 };
  51
  52 #endif  // CHROME_BROWSER_MEDIA_GALLERIES_LINUX_MTP_DEVICE_OBJECT_ENUMERATOR_H_