gdata: Move GDataWapiFeedLoader to a set of new files

chrome/browser/chromeos/gdata/gdata_file_system.h

Index: chrome/browser/chromeos/gdata/gdata_file_system.h
diff --git a/chrome/browser/chromeos/gdata/gdata_file_system.h b/chrome/browser/chromeos/gdata/gdata_file_system.h
index 707ddc3bf917d3f2730dc31e9f7cea945e0a5e3b..bc3d247ff570c0eba4df6cd917542b10ede1e11b 100644
--- a/chrome/browser/chromeos/gdata/gdata_file_system.h
+++ b/chrome/browser/chromeos/gdata/gdata_file_system.h
@@ -19,6 +19,7 @@
 #include "chrome/browser/chromeos/gdata/gdata_file_system_interface.h"
 #include "chrome/browser/chromeos/gdata/gdata_errorcode.h"
 #include "chrome/browser/chromeos/gdata/gdata_files.h"
+#include "chrome/browser/chromeos/gdata/gdata_wapi_feed_loader.h"
 #include "chrome/browser/chromeos/gdata/gdata_wapi_feed_processor.h"
 #include "chrome/browser/prefs/pref_change_registrar.h"
 #include "content/public/browser/notification_observer.h"
@@ -34,167 +35,8 @@ namespace gdata {
 class DocumentsServiceInterface;
 class DriveWebAppsRegistryInterface;
 class GDataWapiFeedLoader;
-struct GetDocumentsParams;
-struct GetDocumentsUiState;
 struct UploadFileInfo;
 
-// Callback run as a response to LoadFromServer.
-//
-// TODO(satorux): Move this to a new file: crbug.com/138268
-typedef base::Callback<void(GetDocumentsParams* params,
-                            GDataFileError error)>
-    LoadDocumentFeedCallback;
-
-// GDataWapiFeedLoader is used to load feeds from WAPI (codename for
-// Documents List API) and load the cached proto file.
-//
-// TODO(satorux): Move this to a new file: crbug.com/138268
-class GDataWapiFeedLoader {
- public:
-  // Used to notify events from the loader.
-  // All events are notified on UI thread.
-  class Observer {
-   public:
-    // Triggered when a content of a directory has been changed.
-    // |directory_path| is a virtual directory path representing the
-    // changed directory.
-    virtual void OnDirectoryChanged(const FilePath& directory_path) {}
-
-    // Triggered when a document feed is fetched. |num_accumulated_entries|
-    // tells the number of entries fetched so far.
-    virtual void OnDocumentFeedFetched(int num_accumulated_entries) {}
-
-    // Triggered when the feed from the server is loaded.
-    virtual void OnFeedFromServerLoaded() {}
-
-   protected:
-    virtual ~Observer() {}
-  };
-
-  GDataWapiFeedLoader(
-      GDataDirectoryService* directory_service,
-      DocumentsServiceInterface* documents_service,
-      DriveWebAppsRegistryInterface* webapps_registry,
-      GDataCache* cache,
-      scoped_refptr<base::SequencedTaskRunner> blocking_task_runner_);
-  ~GDataWapiFeedLoader();
-
-  // Adds and removes the observer.
-  void AddObserver(Observer* observer);
-  void RemoveObserver(Observer* observer);
-
-  // Starts root feed load from the cache. If successful, it will try to find
-  // the file upon retrieval completion. In addition to that, it will
-  // initiate retrieval of the root feed from the server unless
-  // |should_load_from_server| is set to false. |should_load_from_server| is
-  // false only for testing.
-  void LoadFromCache(bool should_load_from_server,
-                     const FilePath& search_file_path,
-                     const FindEntryCallback& callback);
-
-  // Starts root feed load from the server. Value of |start_changestamp|
-  // determines the type of feed to load - 0 means root feed, every other
-  // value would trigger delta feed.
-  // In the case of loading the root feed we use |root_feed_changestamp| as its
-  // initial changestamp value since it does not come with that info.
-  // When done |load_feed_callback| is invoked.
-  // |entry_found_callback| is used only when this is invoked while searching
-  // for file info, and is used in |load_feed_callback|. If successful, it will
-  // try to find the file upon retrieval completion.
-  // |should_fetch_multiple_feeds| is true iff don't want to stop feed loading
-  // after we retrieve first feed chunk.
-  // If invoked as a part of content search, query will be set in
-  // |search_query|.
-  // If |feed_to_load| is set, this is feed url that will be used to load feed.
-  void LoadFromServer(
-      ContentOrigin initial_origin,
-      int start_changestamp,
-      int root_feed_changestamp,
-      bool should_fetch_multiple_feeds,
-      const FilePath& search_file_path,
-      const std::string& search_query,
-      const GURL& feed_to_load,
-      const std::string& directory_resource_id,
-      const FindEntryCallback& entry_found_callback,
-      const LoadDocumentFeedCallback& feed_load_callback);
-
-  // Retrieves account metadata and determines from the last change timestamp
-  // if the feed content loading from the server needs to be initiated.
-  void ReloadFromServerIfNeeded(
-      ContentOrigin initial_origin,
-      int local_changestamp,
-      const FilePath& search_file_path,
-      const FindEntryCallback& callback);
-
-  // Updates whole directory structure feeds collected in |feed_list|.
-  // On success, returns PLATFORM_FILE_OK. Record file statistics as UMA
-  // histograms.
-  //
-  // See comments at GDataWapiFeedProcessor::ApplyFeeds() for
-  // |start_changestamp| and |root_feed_changestamp|.
-  GDataFileError UpdateFromFeed(
-    const std::vector<DocumentFeed*>& feed_list,
-    int start_changestamp,
-    int root_feed_changestamp);
-
- private:
-  // Callback for handling root directory refresh from the cache.
-  void OnProtoLoaded(LoadRootFeedParams* params);
-
-  // Continues handling root directory refresh after the directory service
-  // is fully loaded.
-  void ContinueWithInitializedDirectoryService(LoadRootFeedParams* params,
-                                               GDataFileError error);
-
-  // Helper callback for handling results of metadata retrieval initiated from
-  // ReloadFeedFromServerIfNeeded(). This method makes a decision about fetching
-  // the content of the root feed during the root directory refresh process.
-  void OnGetAccountMetadata(
-      ContentOrigin initial_origin,
-      int local_changestamp,
-      const FilePath& search_file_path,
-      const FindEntryCallback& callback,
-      GDataErrorCode status,
-      scoped_ptr<base::Value> feed_data);
-
-  // Callback for handling feed content fetching while searching for file info.
-  // This callback is invoked after async feed fetch operation that was
-  // invoked by StartDirectoryRefresh() completes. This callback will update
-  // the content of the refreshed directory object and continue initially
-  // started FindEntryByPath() request.
-  void OnFeedFromServerLoaded(GetDocumentsParams* params,
-                              GDataFileError error);
-
-  // Callback for handling response from |GDataDocumentsService::GetDocuments|.
-  // Invokes |callback| when done.
-  void OnGetDocuments(
-      ContentOrigin initial_origin,
-      const LoadDocumentFeedCallback& callback,
-      GetDocumentsParams* params,
-      base::TimeTicks start_time,
-      GDataErrorCode status,
-      scoped_ptr<base::Value> data);
-
-  // Save filesystem to disk.
-  void SaveFileSystem();
-
-  // Callback for handling UI updates caused by document fetching.
-  void OnNotifyDocumentFeedFetched(
-      base::WeakPtr<GetDocumentsUiState> ui_state);
-
-  GDataDirectoryService* directory_service_;  // Not owned.
-  DocumentsServiceInterface* documents_service_;  // Not owned.
-  DriveWebAppsRegistryInterface* webapps_registry_;  // Not owned.
-  GDataCache* cache_;  // Not owned.
-  scoped_refptr<base::SequencedTaskRunner> blocking_task_runner_;
-  ObserverList<Observer> observers_;
-
-  // Note: This should remain the last member so it'll be destroyed and
-  // invalidate its weak pointers before any other members are destroyed.
-  base::WeakPtrFactory<GDataWapiFeedLoader> weak_ptr_factory_;
-  DISALLOW_COPY_AND_ASSIGN(GDataWapiFeedLoader);
-};
-
 // The production implementation of GDataFileSystemInterface.
 class GDataFileSystem : public GDataFileSystemInterface,
                         public GDataWapiFeedLoader::Observer,