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chrome/browser/android/file_downloader.h

Index: chrome/browser/android/file_downloader.h
diff --git a/chrome/browser/android/file_downloader.h b/chrome/browser/android/file_downloader.h
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+// Copyright 2015 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 CHROME_BROWSER_ANDROID_FILE_DOWNLOADER_H_
+#define CHROME_BROWSER_ANDROID_FILE_DOWNLOADER_H_
+
+#include "base/callback.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/memory/weak_ptr.h"
+#include "net/url_request/url_fetcher_delegate.h"
+
+namespace base {
+class FilePath;
+}  // namespace base
+
+namespace net {
+class URLFetcher;
+class URLRequestContextGetter;
+}  // namespace net
+
+class GURL;
+
+// Helper class to download a file from a given URL and store it in a local
+// file. If the local file already exists, reports success without downloading
+// anything.
+// TODO(treib): Add a "bool overwrite" param.
+class FileDownloader : public net::URLFetcherDelegate {
+ public:
+  typedef base::Callback<void(bool /* success */)> DownloadFinishedCallback;
+
+  // Directly starts the download (if necessary) and runs |callback| when done.
+  // If the instance is destroyed before it is finished, |callback| is not run.
+  FileDownloader(const GURL& url,
+                 const base::FilePath& path,
+                 net::URLRequestContextGetter* request_context,
+                 const DownloadFinishedCallback& callback);
+  ~FileDownloader() override;
+
+ private:
+  // net::URLFetcherDelegate implementation.
+  void OnURLFetchComplete(const net::URLFetcher* source) override;
+
+  void OnFileExistsCheckDone(bool exists);
+
+  DownloadFinishedCallback callback_;
+
+  scoped_ptr<net::URLFetcher> fetcher_;
+
+  base::WeakPtrFactory<FileDownloader> weak_ptr_factory_;
+
+  DISALLOW_COPY_AND_ASSIGN(FileDownloader);
+};
+
+#endif  // CHROME_BROWSER_ANDROID_FILE_DOWNLOADER_H_