Move MTPDeviceDelegateImplLinux worker classes to its own files.

chrome/browser/media_gallery/linux/mtp_recursive_device_object_enumerator.cc

+// 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_gallery/linux/mtp_recursive_device_object_enumerator.h"
+
+#include "base/sequenced_task_runner.h"
+#include "base/synchronization/waitable_event.h"
+#include "chrome/browser/media_gallery/linux/mtp_device_object_enumerator.h"
+#include "chrome/browser/media_gallery/linux/mtp_read_directory_worker.h"
+
+namespace chrome {
+
+MTPRecursiveDeviceObjectEnumerator::MTPRecursiveDeviceObjectEnumerator(
+    const std::string& handle,
+    base::SequencedTaskRunner* task_runner,
+    const std::vector<MtpFileEntry>& entries,
+    base::WaitableEvent* task_completed_event,
+    base::WaitableEvent* shutdown_event)
+    : device_handle_(handle),
+      media_task_runner_(task_runner),
+      file_entries_(entries),
+      file_entry_iter_(file_entries_.begin()),
+      on_task_completed_event_(task_completed_event),
+      on_shutdown_event_(shutdown_event) {
+  DCHECK(on_task_completed_event_);
+  DCHECK(on_shutdown_event_);
+  current_enumerator_.reset(new MTPDeviceObjectEnumerator(entries));
+}
+
+MTPRecursiveDeviceObjectEnumerator::~MTPRecursiveDeviceObjectEnumerator() {
+}
+
+FilePath MTPRecursiveDeviceObjectEnumerator::Next() {
+  if (on_shutdown_event_->IsSignaled()) {
+    // Process is in shut down mode.
+    return FilePath();
+  }
+
+  FilePath path = current_enumerator_->Next();
+  if (!path.empty())
+    return path;
+
+  // We reached the end.
+  if (file_entry_iter_ == file_entries_.end())
+    return FilePath();
+
+  // Enumerate subdirectories of the next media file entry.
+  MtpFileEntry next_file_entry = *file_entry_iter_;
+  ++file_entry_iter_;
+
+  // Create a MTPReadDirectoryWorker object to enumerate sub directories.
+  scoped_refptr<MTPReadDirectoryWorker> worker(new MTPReadDirectoryWorker(
+      device_handle_, next_file_entry.item_id(), media_task_runner_,
+      on_task_completed_event_, on_shutdown_event_));
+  worker->Run();
+  if (!worker->get_file_entries().empty()) {
+    current_enumerator_.reset(
+        new MTPDeviceObjectEnumerator(worker->get_file_entries()));
+  } else {
+    current_enumerator_.reset(
+        new fileapi::FileSystemFileUtil::EmptyFileEnumerator());
+  }
+  return current_enumerator_->Next();
+}
+
+int64 MTPRecursiveDeviceObjectEnumerator::Size() {
+  return current_enumerator_->Size();
+}
+
+bool MTPRecursiveDeviceObjectEnumerator::IsDirectory() {
+  return current_enumerator_->IsDirectory();
+}
+
+base::Time MTPRecursiveDeviceObjectEnumerator::LastModifiedTime() {
+  return current_enumerator_->LastModifiedTime();
+}
+
+}  // namespace chrome