Download driver for components/download.

components/download/content/download_driver_impl.h

+// Copyright 2017 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.
+
+#ifndef COMPONENTS_DOWNLOAD_CONTENT_DOWNLOAD_DRIVER_IMPL_H_
+#define COMPONENTS_DOWNLOAD_CONTENT_DOWNLOAD_DRIVER_IMPL_H_
+
+#include <string>
+
+#include "base/files/file_path.h"
+#include "components/download/internal/download_driver.h"
+#include "components/download/public/download_params.h"
+#include "content/public/browser/browser_context.h"
+#include "content/public/browser/download_manager.h"
+
+namespace download {
+
+struct DriverEntry;
+
+// Aggregates and handles all interaction between download service and content
+// download logic.
+class DownloadDriverImpl : public DownloadDriver,
+                           public content::DownloadManager::Observer,
+                           public content::DownloadItem::Observer {
+ public:
+  // Creates a driver entry based on a download item.
+  static DriverEntry CreateDriverEntry(const content::DownloadItem* item);
+
+  // Create the driver. All files downloaded will be saved to |dir|.
+  DownloadDriverImpl(content::DownloadManager* manager,
+                     const base::FilePath& dir);
+  ~DownloadDriverImpl() override;
+
+  // DownloadDriver implementation.
+  void Initialize(DownloadDriver::Client* client) override;
+  bool IsReady() const override;
+  void Start(const DownloadParams& params) override;
+  void Cancel(const std::string& guid) override;
+  void Pause(const std::string& guid) override;
+  void Resume(const std::string& guid) override;
+  base::Optional<DriverEntry> Find(const std::string& guid) override;
+
+ private:
+  // content::DownloadItem::Observer implementation.
+  void OnDownloadUpdated(content::DownloadItem* item) override;
+
+  // content::DownloadManager::Observer implementation.
+  void OnDownloadCreated(content::DownloadManager* manager,
+                         content::DownloadItem* item) override;
+  void OnManagerInitialized() override;
+  void ManagerGoingDown(content::DownloadManager* manager) override;
+
+  // Low level download handle.
+  content::DownloadManager* download_manager_;
+
+  // Target directory of download files.
+  base::FilePath file_dir_;
+
+  // The client that receives updates from low level download logic.
+  DownloadDriver::Client* client_;
+
+  DISALLOW_COPY_AND_ASSIGN(DownloadDriverImpl);
+};
+
+}  // namespace download
+
+#endif  // COMPONENTS_DOWNLOAD_CONTENT_DOWNLOAD_DRIVER_IMPL_H_