[Android] Upstream ChromeBrowserProvider, the Android port ContentProvider implementation.

chrome/browser/android/provider/bookmark_model_observer_task.h

+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef CHROME_BROWSER_ANDROID_PROVIDER_BOOKMARK_MODEL_OBSERVER_TASK_H_
+#define CHROME_BROWSER_ANDROID_PROVIDER_BOOKMARK_MODEL_OBSERVER_TASK_H_
+
+#include "base/basictypes.h"
+#include "base/compiler_specific.h"
+#include "chrome/browser/bookmarks/bookmark_model_observer.h"
+
+// Base class for synchronous tasks that involve the bookmark model.
+// Ensures the model has been loaded before accessing it.
+// Must not be created from the UI thread.
+class BookmarkModelTask {
+ public:
+  explicit BookmarkModelTask(BookmarkModel* model);
+  BookmarkModel* model() const;
+
+ private:
+  BookmarkModel* model_;
+
+  DISALLOW_COPY_AND_ASSIGN(BookmarkModelTask);
+};
+
+// Base class for bookmark model tasks that observe for model updates.
+class BookmarkModelObserverTask : public BookmarkModelTask,
+                                  public BookmarkModelObserver {
+ public:
+  explicit BookmarkModelObserverTask(BookmarkModel* bookmark_model);
+  virtual ~BookmarkModelObserverTask();
+
+  // BookmarkModelObserver:
+  virtual void Loaded(BookmarkModel* model, bool ids_reassigned) OVERRIDE;
+  virtual void BookmarkNodeMoved(BookmarkModel* model,
+                                 const BookmarkNode* old_parent,
+                                 int old_index,
+                                 const BookmarkNode* new_parent,
+                                 int new_index) OVERRIDE;
+  virtual void BookmarkNodeAdded(BookmarkModel* model,
+                                 const BookmarkNode* parent,
+                                 int index) OVERRIDE;
+  virtual void BookmarkNodeRemoved(BookmarkModel* model,
+                                   const BookmarkNode* parent,
+                                   int old_index,
+                                   const BookmarkNode* node) OVERRIDE;
+  virtual void BookmarkNodeChanged(BookmarkModel* model,
+                                   const BookmarkNode* node) OVERRIDE;
+  virtual void BookmarkNodeFaviconChanged(BookmarkModel* model,
+                                          const BookmarkNode* node) OVERRIDE;
+  virtual void BookmarkNodeChildrenReordered(BookmarkModel* model,
+                                             const BookmarkNode* node) OVERRIDE;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(BookmarkModelObserverTask);
+};
+
+#endif  // CHROME_BROWSER_ANDROID_PROVIDER_BOOKMARK_MODEL_OBSERVER_TASK_H_