root/chrome/browser/media_galleries/linux/mtp_device_object_enumerator.cc

DEFINITIONS

1. is_index_ready_
2. Next
3. Size
4. IsDirectory
5. LastModifiedTime
6. GetEntryId
7. HasMoreEntries
8. IsIndexReadyAndInRange

// Copyright (c) 2012 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.

#include "chrome/browser/media_galleries/linux/mtp_device_object_enumerator.h"

#include "base/logging.h"

MTPDeviceObjectEnumerator::MTPDeviceObjectEnumerator(
    const std::vector<MtpFileEntry>& entries)
    : file_entries_(entries),
      index_(0U),
      is_index_ready_(false) {
}

MTPDeviceObjectEnumerator::~MTPDeviceObjectEnumerator() {
}

base::FilePath MTPDeviceObjectEnumerator::Next() {
  if (IsIndexReadyAndInRange())
    ++index_;  // Normal traversal.
  else if (!is_index_ready_)
    is_index_ready_ = true;  // First time calling Next().

  if (!HasMoreEntries())
    return base::FilePath();
  return base::FilePath(file_entries_[index_].file_name());
}

int64 MTPDeviceObjectEnumerator::Size() {
  if (!IsIndexReadyAndInRange())
    return 0;
  return file_entries_[index_].file_size();
}

bool MTPDeviceObjectEnumerator::IsDirectory() {
  if (!IsIndexReadyAndInRange())
    return false;
  return file_entries_[index_].file_type() == MtpFileEntry::FILE_TYPE_FOLDER;
}

base::Time MTPDeviceObjectEnumerator::LastModifiedTime() {
  if (!IsIndexReadyAndInRange())
    return base::Time();
  return base::Time::FromTimeT(file_entries_[index_].modification_time());
}

bool MTPDeviceObjectEnumerator::GetEntryId(uint32_t* entry_id) const {
  DCHECK(entry_id);
  if (!IsIndexReadyAndInRange())
    return false;

  *entry_id = file_entries_[index_].item_id();
  return true;
}

bool MTPDeviceObjectEnumerator::HasMoreEntries() const {
  return index_ < file_entries_.size();
}

bool MTPDeviceObjectEnumerator::IsIndexReadyAndInRange() const {
  return is_index_ready_ && HasMoreEntries();
}