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      1 // Copyright (c) 2013 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 // MTPDeviceObjectEnumerator implementation.
      6 
      7 #include "chrome/browser/media_galleries/win/mtp_device_object_enumerator.h"
      8 
      9 #include "base/logging.h"
     10 #include "base/threading/thread_restrictions.h"
     11 
     12 MTPDeviceObjectEnumerator::MTPDeviceObjectEnumerator(
     13     const MTPDeviceObjectEntries& entries)
     14     : object_entries_(entries),
     15       index_(0U),
     16       is_index_ready_(false) {
     17   base::ThreadRestrictions::AssertIOAllowed();
     18 }
     19 
     20 MTPDeviceObjectEnumerator::~MTPDeviceObjectEnumerator() {
     21   DCHECK(thread_checker_.CalledOnValidThread());
     22 }
     23 
     24 base::FilePath MTPDeviceObjectEnumerator::Next() {
     25   DCHECK(thread_checker_.CalledOnValidThread());
     26   if (IsIndexReadyAndInRange())
     27     ++index_;  // Normal traversal.
     28   else if (!is_index_ready_)
     29     is_index_ready_ = true;  // First time calling Next().
     30 
     31   if (!HasMoreEntries())
     32     return base::FilePath();
     33   return base::FilePath(object_entries_[index_].name);
     34 }
     35 
     36 int64 MTPDeviceObjectEnumerator::Size() {
     37   DCHECK(thread_checker_.CalledOnValidThread());
     38   if (!IsIndexReadyAndInRange())
     39     return 0;
     40   return object_entries_[index_].size;
     41 }
     42 
     43 bool MTPDeviceObjectEnumerator::IsDirectory() {
     44   DCHECK(thread_checker_.CalledOnValidThread());
     45   if (!IsIndexReadyAndInRange())
     46     return false;
     47   return object_entries_[index_].is_directory;
     48 }
     49 
     50 base::Time MTPDeviceObjectEnumerator::LastModifiedTime() {
     51   DCHECK(thread_checker_.CalledOnValidThread());
     52   if (!IsIndexReadyAndInRange())
     53     return base::Time();
     54   return object_entries_[index_].last_modified_time;
     55 }
     56 
     57 base::string16 MTPDeviceObjectEnumerator::GetObjectId() const {
     58   DCHECK(thread_checker_.CalledOnValidThread());
     59   if (!IsIndexReadyAndInRange())
     60     return base::string16();
     61   return object_entries_[index_].object_id;
     62 }
     63 
     64 bool MTPDeviceObjectEnumerator::HasMoreEntries() const {
     65   return index_ < object_entries_.size();
     66 }
     67 
     68 bool MTPDeviceObjectEnumerator::IsIndexReadyAndInRange() const {
     69   return is_index_ready_ && HasMoreEntries();
     70 }
     71