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      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
     48