chrome/browser/bookmarks/bookmark_html_writer.h

   1 // Copyright (c) 2012 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 #ifndef CHROME_BROWSER_BOOKMARKS_BOOKMARK_HTML_WRITER_H_
   6 #define CHROME_BROWSER_BOOKMARKS_BOOKMARK_HTML_WRITER_H_
   7
   8 #include <list>
   9 #include <map>
  10 #include <string>
  11
  12 #include "base/files/file_path.h"
  13 #include "base/memory/ref_counted.h"
  14 #include "base/memory/ref_counted_memory.h"
  15 #include "base/task/cancelable_task_tracker.h"
  16 #include "content/public/browser/notification_observer.h"
  17 #include "content/public/browser/notification_registrar.h"
  18
  19 class BookmarkNode;
  20 class Profile;
  21
  22 namespace chrome {
  23 struct FaviconBitmapResult;
  24 }
  25
  26 // Observer for bookmark html output. Used only in tests.
  27 class BookmarksExportObserver {
  28  public:
  29   // Is invoked on the IO thread.
  30   virtual void OnExportFinished() = 0;
  31
  32  protected:
  33   virtual ~BookmarksExportObserver() {}
  34 };
  35
  36 // Class that fetches favicons for list of bookmarks and
  37 // then starts Writer which outputs bookmarks and favicons to html file.
  38 // Should be used only by WriteBookmarks function.
  39 class BookmarkFaviconFetcher: public content::NotificationObserver {
  40  public:
  41   // Map of URL and corresponding favicons.
  42   typedef std::map<std::string, scoped_refptr<base::RefCountedMemory> >
  43       URLFaviconMap;
  44
  45   BookmarkFaviconFetcher(Profile* profile,
  46                          const base::FilePath& path,
  47                          BookmarksExportObserver* observer);
  48   virtual ~BookmarkFaviconFetcher();
  49
  50   // Executes bookmark export process.
  51   void ExportBookmarks();
  52
  53   // content::NotificationObserver implementation.
  54   virtual void Observe(int type,
  55                        const content::NotificationSource& source,
  56                        const content::NotificationDetails& details) OVERRIDE;
  57
  58  private:
  59   // Recursively extracts URLs from bookmarks.
  60   void ExtractUrls(const BookmarkNode* node);
  61
  62   // Executes Writer task that writes bookmarks data to html file.
  63   void ExecuteWriter();
  64
  65   // Starts async fetch for the next bookmark favicon.
  66   // Takes single url from bookmark_urls_ and removes it from the list.
  67   // Returns true if there are more favicons to extract.
  68   bool FetchNextFavicon();
  69
  70   // Favicon fetch callback. After all favicons are fetched executes
  71   // html output on the file thread.
  72   void OnFaviconDataAvailable(const chrome::FaviconBitmapResult& bitmap_result);
  73
  74   // The Profile object used for accessing FaviconService, bookmarks model.
  75   Profile* profile_;
  76
  77   // All URLs that are extracted from bookmarks. Used to fetch favicons
  78   // for each of them. After favicon is fetched top url is removed from list.
  79   std::list<std::string> bookmark_urls_;
  80
  81   // Tracks favicon tasks.
  82   base::CancelableTaskTracker cancelable_task_tracker_;
  83
  84   // Map that stores favicon per URL.
  85   scoped_ptr<URLFaviconMap> favicons_map_;
  86
  87   // Path where html output is stored.
  88   base::FilePath path_;
  89
  90   BookmarksExportObserver* observer_;
  91
  92   content::NotificationRegistrar registrar_;
  93
  94   DISALLOW_COPY_AND_ASSIGN(BookmarkFaviconFetcher);
  95 };
  96
  97 namespace bookmark_html_writer {
  98
  99 // Writes the bookmarks out in the 'bookmarks.html' format understood by
 100 // Firefox and IE. The results are written to the file at |path|.  The file
 101 // thread is used.
 102 // Before writing to the file favicons are fetched on the main thread.
 103 // TODO(sky): need a callback on failure.
 104 void WriteBookmarks(Profile* profile,
 105                     const base::FilePath& path,
 106                     BookmarksExportObserver* observer);
 107
 108 }  // namespace bookmark_html_writer
 109
 110 #endif  // CHROME_BROWSER_BOOKMARKS_BOOKMARK_HTML_WRITER_H_