chrome/browser/sync_file_system/conflict_resolution_resolver.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/conflict_resolution_resolver.h"
   6
   7 #include "base/logging.h"
   8 #include "base/time/time.h"
   9
  10 namespace sync_file_system {
  11
  12 ConflictResolutionResolver::ConflictResolutionResolver(
  13     ConflictResolutionPolicy policy)
  14     : policy_(policy) {}
  15
  16 ConflictResolutionResolver::~ConflictResolutionResolver() {}
  17
  18 ConflictResolution ConflictResolutionResolver::Resolve(
  19       SyncFileType local_file_type,
  20       const base::Time& local_update_time,
  21       SyncFileType remote_file_type,
  22       const base::Time& remote_update_time) {
  23   // Currently we always prioritize directories over files regardless of
  24   // conflict resolution policy.
  25   if (remote_file_type == SYNC_FILE_TYPE_DIRECTORY)
  26     return CONFLICT_RESOLUTION_REMOTE_WIN;
  27
  28   if (policy_ == CONFLICT_RESOLUTION_POLICY_MANUAL)
  29     return CONFLICT_RESOLUTION_MARK_CONFLICT;
  30
  31   // Remote time is null, cannot determine the resolution.
  32   if (remote_update_time.is_null())
  33     return CONFLICT_RESOLUTION_UNKNOWN;
  34
  35   // Local time should be always given.
  36   DCHECK(!local_update_time.is_null());
  37
  38   DCHECK_EQ(CONFLICT_RESOLUTION_POLICY_LAST_WRITE_WIN, policy_);
  39   if (local_update_time >= remote_update_time ||
  40       remote_file_type == SYNC_FILE_TYPE_UNKNOWN) {
  41     return CONFLICT_RESOLUTION_LOCAL_WIN;
  42   }
  43
  44   return CONFLICT_RESOLUTION_REMOTE_WIN;
  45 }
  46
  47 }  // namespace sync_file_system