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      1 // Copyright 2013 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_MEDIA_GALLERIES_FILEAPI_ITUNES_DATA_PROVIDER_H_
      6 #define CHROME_BROWSER_MEDIA_GALLERIES_FILEAPI_ITUNES_DATA_PROVIDER_H_
      7 
      8 #include <map>
      9 #include <set>
     10 #include <string>
     11 
     12 #include "base/basictypes.h"
     13 #include "base/callback_forward.h"
     14 #include "base/files/file_path.h"
     15 #include "base/files/file_path_watcher.h"
     16 #include "chrome/browser/media_galleries/fileapi/iapps_data_provider.h"
     17 #include "chrome/browser/media_galleries/fileapi/safe_iapps_library_parser.h"
     18 
     19 namespace itunes {
     20 
     21 class TestITunesDataProvider;
     22 
     23 // This class is the holder for iTunes parsed data. Given a path to the iTunes
     24 // library XML file it will read it in, parse the data, and provide convenient
     25 // methods to access it.  When the file changes, it will update the data.
     26 // It is not thread safe, but can be run on any thread with IO access.
     27 class ITunesDataProvider : public iapps::IAppsDataProvider {
     28  public:
     29   typedef std::string ArtistName;
     30   typedef std::string AlbumName;
     31   typedef std::string TrackName;
     32   typedef std::map<TrackName, base::FilePath> Album;
     33 
     34   explicit ITunesDataProvider(const base::FilePath& library_path);
     35   virtual ~ITunesDataProvider();
     36 
     37   // Get the platform path for the auto-add directory.
     38   virtual const base::FilePath& auto_add_path() const;
     39 
     40   // Returns true if |artist| exists in the library.
     41   bool KnownArtist(const ArtistName& artist) const;
     42 
     43   // Returns true if |artist| has an album by the name |album| in the library.
     44   bool KnownAlbum(const ArtistName& artist, const AlbumName& album) const;
     45 
     46   // Get the track named (filename basename) |track| in |album| by |artist|.
     47   // If no such track exists, an empty FilePath is returned.
     48   base::FilePath GetTrackLocation(const ArtistName& artist,
     49                                   const AlbumName& album,
     50                                   const TrackName& track) const;
     51 
     52   // Get the set of artists.
     53   std::set<ArtistName> GetArtistNames() const;
     54 
     55   // Get the set of albums for |artist|.
     56   std::set<AlbumName> GetAlbumNames(const ArtistName& artist) const;
     57 
     58   // Get the tracks for the |album| by |artist|.
     59   Album GetAlbum(const ArtistName& artist, const AlbumName& album) const;
     60 
     61  private:
     62   friend class TestITunesDataProvider;
     63 
     64   typedef std::map<AlbumName, Album> Artist;
     65   typedef std::map<ArtistName, Artist> Library;
     66 
     67   // Parse the library xml file.
     68   virtual void DoParseLibrary(const base::FilePath& library_path,
     69                               const ReadyCallback& ready_callback) OVERRIDE;
     70 
     71   // Called when the utility process finishes parsing the library XML file.
     72   void OnLibraryParsed(const ReadyCallback& ready_callback,
     73                        bool result,
     74                        const parser::Library& library);
     75 
     76   // Path to the auto-add directory.
     77   const base::FilePath auto_add_path_;
     78 
     79   // The parsed and uniquified data.
     80   Library library_;
     81 
     82   scoped_refptr<iapps::SafeIAppsLibraryParser> xml_parser_;
     83 
     84   // Hides parent class member, but it is private, and there's no way to get a
     85   // WeakPtr<Derived> from a WeakPtr<Base> without using SupportsWeakPtr.
     86   base::WeakPtrFactory<ITunesDataProvider> weak_factory_;
     87 
     88   DISALLOW_COPY_AND_ASSIGN(ITunesDataProvider);
     89 };
     90 
     91 }  // namespace itunes
     92 
     93 #endif  // CHROME_BROWSER_MEDIA_GALLERIES_FILEAPI_ITUNES_DATA_PROVIDER_H_
     94