chrome/browser/sync_file_system/drive_backend/tracker_set.cc

   1 // Copyright 2013 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 "chrome/browser/sync_file_system/drive_backend/tracker_set.h"
   6
   7 #include "base/logging.h"
   8 #include "base/stl_util.h"
   9 #include "chrome/browser/sync_file_system/drive_backend/metadata_database.pb.h"
  10
  11 namespace sync_file_system {
  12 namespace drive_backend {
  13
  14 bool TrackerSet::TrackerComparator::operator()(const FileTracker* left,
  15                                                const FileTracker* right) const {
  16   return left->tracker_id() < right->tracker_id();
  17 }
  18
  19 TrackerSet::TrackerSet()
  20     : active_tracker_(NULL) {
  21 }
  22
  23 TrackerSet::~TrackerSet() {}
  24
  25 void TrackerSet::Insert(FileTracker* tracker) {
  26   if (tracker_set_.insert(tracker).second && tracker->active()) {
  27     DCHECK(!active_tracker_);
  28     active_tracker_ = tracker;
  29   }
  30 }
  31
  32 void TrackerSet::Erase(FileTracker* tracker) {
  33   if (tracker_set_.erase(tracker) == 1 && active_tracker_ == tracker)
  34     active_tracker_ = NULL;
  35 }
  36
  37 void TrackerSet::Activate(FileTracker* tracker) {
  38   DCHECK(!active_tracker_);
  39   DCHECK(ContainsKey(tracker_set_, tracker));
  40   active_tracker_ = tracker;
  41 }
  42
  43 void TrackerSet::Inactivate(FileTracker* tracker) {
  44   DCHECK(tracker->active());
  45   DCHECK_EQ(tracker, active_tracker_);
  46   DCHECK(ContainsKey(tracker_set_, tracker));
  47   active_tracker_ = NULL;
  48 }
  49
  50 }  // namespace drive_backend
  51 }  // namespace sync_file_system