content/browser/accessibility/ax_tree_id_registry.h

   1 // Copyright 2014 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 CONTENT_BROWSER_ACCESSIBILITY_AX_TREE_ID_REGISTRY_H_
   6 #define CONTENT_BROWSER_ACCESSIBILITY_AX_TREE_ID_REGISTRY_H_
   7
   8 #include <map>
   9
  10 #include "base/stl_util.h"
  11
  12 template <typename T>
  13 struct DefaultSingletonTraits;
  14
  15 namespace content {
  16
  17 // A class which generates a unique id given a process id and frame routing id.
  18 class AXTreeIDRegistry {
  19  public:
  20   typedef std::pair<int, int> FrameID;
  21
  22   typedef int AXTreeID;
  23
  24   static const AXTreeID kNoAXTreeID;
  25
  26   // Get the single instance of this class.
  27   static AXTreeIDRegistry* GetInstance();
  28
  29   // Obtains a unique id given a |process_id| and |routing_id|. Placeholder
  30   // for full implementation once out of process iframe accessibility finalizes.
  31   AXTreeID GetOrCreateAXTreeID(int process_id, int routing_id);
  32   FrameID GetFrameID(AXTreeID ax_tree_id);
  33   void RemoveAXTreeID(AXTreeID ax_tree_id);
  34
  35  private:
  36   friend struct DefaultSingletonTraits<AXTreeIDRegistry>;
  37
  38   AXTreeIDRegistry();
  39   virtual ~AXTreeIDRegistry();
  40
  41   // Tracks the current unique ax frame id.
  42   AXTreeID ax_tree_id_counter_;
  43
  44   // Maps an accessibility tree to its frame via ids.
  45   std::map<AXTreeID, FrameID> ax_tree_to_frame_id_map_;
  46
  47   // Maps frames to an accessibility tree via ids.
  48   std::map<FrameID, AXTreeID> frame_to_ax_tree_id_map_;
  49
  50   DISALLOW_COPY_AND_ASSIGN(AXTreeIDRegistry);
  51 };
  52
  53 }  // namespace content
  54
  55 #endif  // CONTENT_BROWSER_ACCESSIBILITY_AX_TREE_ID_REGISTRY_H_