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// Copyright 2012 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CHROME_BROWSER_MEDIA_GALLERIES_CHROMEOS_MTP_DEVICE_OBJECT_ENUMERATOR_H_
#define CHROME_BROWSER_MEDIA_GALLERIES_CHROMEOS_MTP_DEVICE_OBJECT_ENUMERATOR_H_
#include <stddef.h>
#include <stdint.h>
#include <vector>
#include "base/files/file_path.h"
#include "base/time/time.h"
#include "services/device/public/mojom/mtp_file_entry.mojom.h"
// Used to enumerate top-level files of an media file system.
class MTPDeviceObjectEnumerator {
public:
explicit MTPDeviceObjectEnumerator(
std::vector<device::mojom::MtpFileEntryPtr> entries);
MTPDeviceObjectEnumerator(const MTPDeviceObjectEnumerator&) = delete;
MTPDeviceObjectEnumerator& operator=(const MTPDeviceObjectEnumerator&) =
delete;
~MTPDeviceObjectEnumerator();
base::FilePath Next();
int64_t Size();
bool IsDirectory();
base::Time LastModifiedTime();
// If the current file entry is valid, returns true and fills in |entry_id|
// with the entry identifier else returns false and |entry_id| is not set.
bool GetEntryId(uint32_t* entry_id) const;
private:
// Returns true if the enumerator has more entries to traverse, false
// otherwise.
bool HasMoreEntries() const;
// Returns true if Next() has been called at least once, and the enumerator
// has more entries to traverse.
bool IsIndexReadyAndInRange() const;
// List of directory file entries information.
const std::vector<device::mojom::MtpFileEntryPtr> file_entries_;
// Index into |file_entries_|.
// Should only be used when |is_index_ready_| is true.
size_t index_;
// Initially false. Set to true after Next() has been called.
bool is_index_ready_;
};
#endif // CHROME_BROWSER_MEDIA_GALLERIES_CHROMEOS_MTP_DEVICE_OBJECT_ENUMERATOR_H_
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