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_IAPPS_DATA_PROVIDER_H_ 6 #define CHROME_BROWSER_MEDIA_GALLERIES_FILEAPI_IAPPS_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 "base/memory/weak_ptr.h" 17 18 namespace iapps { 19 20 // This class is the holder for iTunes parsed data. Given a path to the iTunes 21 // library XML file it will read it in, parse the data, and provide convenient 22 // methods to access it. When the file changes, it will update the data. 23 // It is not thread safe, but can be run on any thread with IO access. 24 class IAppsDataProvider { 25 public: 26 typedef base::Callback<void(bool)> ReadyCallback; 27 28 explicit IAppsDataProvider(const base::FilePath& library_path); 29 virtual ~IAppsDataProvider(); 30 31 // Ask the data provider to refresh the data if necessary. |ready_callback| 32 // will be called with the result; false if unable to parse the XML file. 33 virtual void RefreshData(const ReadyCallback& ready_callback); 34 35 // Get the platform path for the library XML file. 36 const base::FilePath& library_path() const; 37 38 protected: 39 bool valid() const; 40 41 // Subclass should set this to true if the last parse succeeded. 42 void set_valid(bool valid); 43 44 // Signal to subclass to parse the |library_path|. The |ready_callback| 45 // should be called when parsing has finished. 46 virtual void DoParseLibrary(const base::FilePath& library_path, 47 const ReadyCallback& ready_callback) = 0; 48 49 // Called when |library_path_| has changed. Virtual for testing. 50 virtual void OnLibraryChanged(const base::FilePath& path, bool error); 51 52 private: 53 // Called when the FilePathWatcher for |library_path_| has tried to add an 54 // watch. 55 void OnLibraryWatchStarted(scoped_ptr<base::FilePathWatcher> library_watcher); 56 57 // Path to the library XML file. 58 const base::FilePath library_path_; 59 60 // True if the data needs to be refreshed from disk. 61 bool needs_refresh_; 62 63 // True if |library_| contains valid data. False at construction and if 64 // reading or parsing the XML file fails. 65 bool is_valid_; 66 67 // A watcher on the library xml file. 68 scoped_ptr<base::FilePathWatcher> library_watcher_; 69 70 base::WeakPtrFactory<IAppsDataProvider> weak_factory_; 71 72 DISALLOW_COPY_AND_ASSIGN(IAppsDataProvider); 73 }; 74 75 } // namespace iapps 76 77 #endif // CHROME_BROWSER_MEDIA_GALLERIES_FILEAPI_IAPPS_DATA_PROVIDER_H_ 78
