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