components/storage_monitor/transient_device_ids.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 // TransientDeviceIds implementation.
   6
   7 #include "components/storage_monitor/transient_device_ids.h"
   8
   9 #include "base/guid.h"
  10 #include "base/logging.h"
  11 #include "base/stl_util.h"
  12 #include "components/storage_monitor/storage_info.h"
  13
  14 namespace storage_monitor {
  15
  16 TransientDeviceIds::TransientDeviceIds() {}
  17
  18 TransientDeviceIds::~TransientDeviceIds() {}
  19
  20 std::string TransientDeviceIds::GetTransientIdForDeviceId(
  21     const std::string& device_id) {
  22   DCHECK(thread_checker_.CalledOnValidThread());
  23
  24   if (!ContainsKey(device_id_map_, device_id)) {
  25     std::string transient_id;
  26     do {
  27       transient_id = base::GenerateGUID();
  28     } while (ContainsKey(transient_id_map_, transient_id));
  29
  30     device_id_map_[device_id] = transient_id;
  31     transient_id_map_[transient_id] = device_id;
  32   }
  33
  34   return device_id_map_[device_id];
  35 }
  36
  37 std::string TransientDeviceIds::DeviceIdFromTransientId(
  38     const std::string& transient_id) const {
  39   IdMap::const_iterator it = transient_id_map_.find(transient_id);
  40   if (it == transient_id_map_.end())
  41     return std::string();
  42   return it->second;
  43 }
  44
  45 }  // namespace storage_monitor