chrome/browser/sync_file_system/drive_backend/remote_change_handler.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/remote_change_handler.h"
   6
   7 #include "base/logging.h"
   8 #include "webkit/common/fileapi/file_system_util.h"
   9
  10 namespace sync_file_system {
  11
  12 RemoteChangeHandler::ChangeQueueItem::ChangeQueueItem()
  13     : changestamp(0) {}
  14
  15 RemoteChangeHandler::ChangeQueueItem::ChangeQueueItem(
  16     int64 changestamp,
  17     const fileapi::FileSystemURL& url)
  18     : changestamp(changestamp), url(url) {}
  19
  20 bool RemoteChangeHandler::ChangeQueueComparator::operator()(
  21     const ChangeQueueItem& left,
  22     const ChangeQueueItem& right) {
  23   if (left.changestamp != right.changestamp)
  24     return left.changestamp < right.changestamp;
  25   return fileapi::FileSystemURL::Comparator()(left.url, right.url);
  26 }
  27
  28 RemoteChangeHandler::RemoteChange::RemoteChange()
  29     : changestamp(0),
  30       change(FileChange::FILE_CHANGE_ADD_OR_UPDATE, SYNC_FILE_TYPE_UNKNOWN) {}
  31
  32 RemoteChangeHandler::RemoteChange::RemoteChange(
  33     int64 changestamp,
  34     const std::string& resource_id,
  35     const std::string& md5_checksum,
  36     const base::Time& updated_time,
  37     const fileapi::FileSystemURL& url,
  38     const FileChange& change)
  39     : changestamp(changestamp),
  40       resource_id(resource_id),
  41       md5_checksum(md5_checksum),
  42       updated_time(updated_time),
  43       url(url),
  44       change(change) {}
  45
  46 RemoteChangeHandler::RemoteChange::~RemoteChange() {}
  47
  48 bool RemoteChangeHandler::RemoteChangeComparator::operator()(
  49     const RemoteChange& left,
  50     const RemoteChange& right) {
  51   // This should return true if |right| has higher priority than |left|.
  52   // Smaller changestamps have higher priorities (i.e. need to be processed
  53   // earlier).
  54   if (left.changestamp != right.changestamp)
  55     return left.changestamp > right.changestamp;
  56   return false;
  57 }
  58
  59 RemoteChangeHandler::RemoteChangeHandler() {}
  60
  61 RemoteChangeHandler::~RemoteChangeHandler() {}
  62
  63 bool RemoteChangeHandler::GetChange(RemoteChange* remote_change) {
  64   const fileapi::FileSystemURL& url = changes_.begin()->url;
  65   const base::FilePath::StringType& normalized_path =
  66       fileapi::VirtualPath::GetNormalizedFilePath(url.path());
  67   DCHECK(ContainsKey(origin_to_changes_map_, url.origin()));
  68   PathToChangeMap* path_to_change = &origin_to_changes_map_[url.origin()];
  69   DCHECK(ContainsKey(*path_to_change, normalized_path));
  70   *remote_change = (*path_to_change)[normalized_path].remote_change;
  71   return true;
  72 }
  73
  74 bool RemoteChangeHandler::GetChangeForURL(
  75     const fileapi::FileSystemURL& url,
  76     RemoteChange* remote_change) {
  77   OriginToChangesMap::iterator found_origin =
  78       origin_to_changes_map_.find(url.origin());
  79   if (found_origin == origin_to_changes_map_.end())
  80     return false;
  81
  82   PathToChangeMap* path_to_change = &found_origin->second;
  83   PathToChangeMap::iterator found_change = path_to_change->find(
  84       fileapi::VirtualPath::GetNormalizedFilePath(url.path()));
  85   if (found_change == path_to_change->end())
  86     return false;
  87
  88   *remote_change = found_change->second.remote_change;
  89   return true;
  90 }
  91
  92 void RemoteChangeHandler::AppendChange(const RemoteChange& remote_change) {
  93   base::FilePath::StringType normalized_path =
  94       fileapi::VirtualPath::GetNormalizedFilePath(remote_change.url.path());
  95
  96   PathToChangeMap* path_to_change =
  97       &origin_to_changes_map_[remote_change.url.origin()];
  98   PathToChangeMap::iterator found = path_to_change->find(normalized_path);
  99
 100   // Remove an existing change for |remote_change.url.path()|.
 101   if (found != path_to_change->end())
 102     changes_.erase(found->second.position_in_queue);
 103
 104   std::pair<PendingChangeQueue::iterator, bool> inserted_to_queue =
 105       changes_.insert(ChangeQueueItem(remote_change.changestamp,
 106                                       remote_change.url));
 107   DCHECK(inserted_to_queue.second);
 108
 109   (*path_to_change)[normalized_path] =
 110       ChangeMapItem(remote_change, inserted_to_queue.first);
 111 }
 112
 113 bool RemoteChangeHandler::RemoveChangeForURL(
 114     const fileapi::FileSystemURL& url) {
 115   OriginToChangesMap::iterator found_origin =
 116       origin_to_changes_map_.find(url.origin());
 117   if (found_origin == origin_to_changes_map_.end())
 118     return false;
 119
 120   PathToChangeMap* path_to_change = &found_origin->second;
 121   PathToChangeMap::iterator found_change = path_to_change->find(
 122       fileapi::VirtualPath::GetNormalizedFilePath(url.path()));
 123   if (found_change == path_to_change->end())
 124     return false;
 125
 126   changes_.erase(found_change->second.position_in_queue);
 127   path_to_change->erase(found_change);
 128   if (path_to_change->empty())
 129     origin_to_changes_map_.erase(found_origin);
 130   return true;
 131 }
 132
 133 void RemoteChangeHandler::RemoveChangesForOrigin(const GURL& origin) {
 134   OriginToChangesMap::iterator found = origin_to_changes_map_.find(origin);
 135   if (found == origin_to_changes_map_.end())
 136     return;
 137   for (PathToChangeMap::iterator itr = found->second.begin();
 138        itr != found->second.end(); ++itr)
 139     changes_.erase(itr->second.position_in_queue);
 140   origin_to_changes_map_.erase(found);
 141 }
 142
 143 bool RemoteChangeHandler::HasChangesForOrigin(const GURL& origin) const {
 144   return ContainsKey(origin_to_changes_map_, origin);
 145 }
 146
 147 RemoteChangeHandler::ChangeMapItem::ChangeMapItem() {}
 148
 149 RemoteChangeHandler::ChangeMapItem::ChangeMapItem(
 150     const RemoteChange& remote_change,
 151     PendingChangeQueue::iterator position_in_queue)
 152   : remote_change(remote_change),
 153     position_in_queue(position_in_queue) {}
 154
 155 RemoteChangeHandler::ChangeMapItem::~ChangeMapItem() {}
 156
 157 }  // namespace sync_file_system