add FileProviderEnumeratorWorkingSet & FileProviderEnumeratorFile

PickerFileProvider/FileProvider.swift

@@ -119,7 +119,7 @@ class FileProvider: NSFileProviderExtension {
         if (containerItemIdentifier == NSFileProviderItemIdentifier.rootContainer) {
             maybeEnumerator = FileProviderEnumerator(enumeratedItemIdentifier: containerItemIdentifier)
         } else if (containerItemIdentifier == NSFileProviderItemIdentifier.workingSet) {
-            maybeEnumerator = FileProviderEnumerator(enumeratedItemIdentifier: containerItemIdentifier)
+            maybeEnumerator = FileProviderEnumeratorWorkingSet(enumeratedItemIdentifier: containerItemIdentifier)
         } else {
             // determine if the item is a directory or a file
             // - for a directory, instantiate an enumerator of its subitems
@@ -129,7 +129,7 @@ class FileProvider: NSFileProviderExtension {
             if item.typeIdentifier == kUTTypeFolder as String {
                 maybeEnumerator = FileProviderEnumerator(enumeratedItemIdentifier: containerItemIdentifier)
             } else {
-                maybeEnumerator = FileProviderEnumerator(enumeratedItemIdentifier: containerItemIdentifier)
+                maybeEnumerator = FileProviderEnumeratorFile(enumeratedItemIdentifier: containerItemIdentifier)
             }
         }
         

PickerFileProvider/FileProviderEnumeratorFile.swift

@@ -5,5 +5,64 @@
 //  Created by Marino Faggiana on 30/04/18.
 //  Copyright © 2018 TWS. All rights reserved.
 //
+//  Author Marino Faggiana <m.faggiana@twsweb.it>
+//
+//  This program is free software: you can redistribute it and/or modify
+//  it under the terms of the GNU General Public License as published by
+//  the Free Software Foundation, either version 3 of the License, or
+//  (at your option) any later version.
+//
+//  This program is distributed in the hope that it will be useful,
+//  but WITHOUT ANY WARRANTY; without even the implied warranty of
+//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+//  GNU General Public License for more details.
+//
+//  You should have received a copy of the GNU General Public License
+//  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+//
+
+
+import FileProvider
+
+class FileProviderEnumeratorFile: NSObject, NSFileProviderEnumerator {
+    
+    var enumeratedItemIdentifier: NSFileProviderItemIdentifier
+    
+    init(enumeratedItemIdentifier: NSFileProviderItemIdentifier) {
+        self.enumeratedItemIdentifier = enumeratedItemIdentifier
+        super.init()
+    }
+    
+    func invalidate() {
+        // TODO: perform invalidation of server connection if necessary
+    }
+    
+    func enumerateItems(for observer: NSFileProviderEnumerationObserver, startingAt page: NSFileProviderPage) {
+        /* TODO:
+         - inspect the page to determine whether this is an initial or a follow-up request
+         
+         If this is an enumerator for a directory, the root container or all directories:
+         - perform a server request to fetch directory contents
+         If this is an enumerator for the active set:
+         - perform a server request to update your local database
+         - fetch the active set from your local database
+         
+         - inform the observer about the items returned by the server (possibly multiple times)
+         - inform the observer that you are finished with this page
+         */
+    }
+    
+    func enumerateChanges(for observer: NSFileProviderChangeObserver, from anchor: NSFileProviderSyncAnchor) {
+        /* TODO:
+         - query the server for updates since the passed-in sync anchor
+         
+         If this is an enumerator for the active set:
+         - note the changes in your local database
+         
+         - inform the observer about item deletions and updates (modifications + insertions)
+         - inform the observer when you have finished enumerating up to a subsequent sync anchor
+         */
+    }
+    
+}
 
-import Foundation

PickerFileProvider/FileProviderEnumeratorWorkingSet.swift

@@ -5,5 +5,62 @@
 //  Created by Marino Faggiana on 30/04/18.
 //  Copyright © 2018 TWS. All rights reserved.
 //
+//  Author Marino Faggiana <m.faggiana@twsweb.it>
+//
+//  This program is free software: you can redistribute it and/or modify
+//  it under the terms of the GNU General Public License as published by
+//  the Free Software Foundation, either version 3 of the License, or
+//  (at your option) any later version.
+//
+//  This program is distributed in the hope that it will be useful,
+//  but WITHOUT ANY WARRANTY; without even the implied warranty of
+//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+//  GNU General Public License for more details.
+//
+//  You should have received a copy of the GNU General Public License
+//  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+//
+
+import FileProvider
 
-import Foundation
+class FileProviderEnumeratorWorkingSet: NSObject, NSFileProviderEnumerator {
+    
+    var enumeratedItemIdentifier: NSFileProviderItemIdentifier
+    
+    init(enumeratedItemIdentifier: NSFileProviderItemIdentifier) {
+        self.enumeratedItemIdentifier = enumeratedItemIdentifier
+        super.init()
+    }
+    
+    func invalidate() {
+        // TODO: perform invalidation of server connection if necessary
+    }
+    
+    func enumerateItems(for observer: NSFileProviderEnumerationObserver, startingAt page: NSFileProviderPage) {
+        /* TODO:
+         - inspect the page to determine whether this is an initial or a follow-up request
+         
+         If this is an enumerator for a directory, the root container or all directories:
+         - perform a server request to fetch directory contents
+         If this is an enumerator for the active set:
+         - perform a server request to update your local database
+         - fetch the active set from your local database
+         
+         - inform the observer about the items returned by the server (possibly multiple times)
+         - inform the observer that you are finished with this page
+         */
+    }
+    
+    func enumerateChanges(for observer: NSFileProviderChangeObserver, from anchor: NSFileProviderSyncAnchor) {
+        /* TODO:
+         - query the server for updates since the passed-in sync anchor
+         
+         If this is an enumerator for the active set:
+         - note the changes in your local database
+         
+         - inform the observer about item deletions and updates (modifications + insertions)
+         - inform the observer when you have finished enumerating up to a subsequent sync anchor
+         */
+    }
+    
+}