content/browser/accessibility/ax_tree_id_registry.cc

   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 #include "content/browser/accessibility/ax_tree_id_registry.h"
   6
   7 #include "base/memory/singleton.h"
   8
   9 namespace content {
  10
  11 // static
  12 const AXTreeIDRegistry::AXTreeID AXTreeIDRegistry::kNoAXTreeID = -1;
  13
  14 // static
  15 AXTreeIDRegistry* AXTreeIDRegistry::GetInstance() {
  16   return base::Singleton<AXTreeIDRegistry>::get();
  17 }
  18
  19 AXTreeIDRegistry::AXTreeID AXTreeIDRegistry::GetOrCreateAXTreeID(
  20     int process_id, int routing_id) {
  21   FrameID frame_id(process_id, routing_id);
  22   std::map<FrameID, AXTreeID>::iterator it;
  23   it = frame_to_ax_tree_id_map_.find(frame_id);
  24   if (it != frame_to_ax_tree_id_map_.end())
  25     return it->second;
  26
  27   AXTreeID new_id = ++ax_tree_id_counter_;
  28   frame_to_ax_tree_id_map_[frame_id] = new_id;
  29   ax_tree_to_frame_id_map_[new_id] = frame_id;
  30
  31   return new_id;
  32 }
  33
  34 AXTreeIDRegistry::FrameID AXTreeIDRegistry::GetFrameID(
  35     AXTreeIDRegistry::AXTreeID ax_tree_id) {
  36   std::map<AXTreeID, FrameID>::iterator it;
  37   it = ax_tree_to_frame_id_map_.find(ax_tree_id);
  38   if (it != ax_tree_to_frame_id_map_.end())
  39     return it->second;
  40
  41   return FrameID(-1, -1);
  42 }
  43
  44 void AXTreeIDRegistry::RemoveAXTreeID(AXTreeIDRegistry::AXTreeID ax_tree_id) {
  45   std::map<AXTreeID, FrameID>::iterator it;
  46   it = ax_tree_to_frame_id_map_.find(ax_tree_id);
  47   if (it != ax_tree_to_frame_id_map_.end()) {
  48     frame_to_ax_tree_id_map_.erase(it->second);
  49     ax_tree_to_frame_id_map_.erase(it);
  50   }
  51 }
  52
  53 AXTreeIDRegistry::AXTreeIDRegistry() : ax_tree_id_counter_(-1) {
  54   // Always populate default desktop tree value (0 -> 0, 0).
  55   GetOrCreateAXTreeID(0, 0);
  56 }
  57
  58 AXTreeIDRegistry::~AXTreeIDRegistry() {
  59 }
  60
  61 }  // namespace content