Amazon.CognitoSync.SyncManager.Internal.SQLiteLocalStorage.GetCommonDatasetNames C# (CSharp) Method

        private HashSet<string> GetCommonDatasetNames(string oldIdentityId, string newIdentityId)
        {
            HashSet<string> newNameSet = new HashSet<string>();
            HashSet<string> oldNameSet = new HashSet<string>();
            if (oldIdentityId != null && newIdentityId != null)
            {
                List<DatasetMetadata> newDatasets = GetDatasetMetadata(newIdentityId);
                List<DatasetMetadata> oldDatasets = GetDatasetMetadata(oldIdentityId);
                foreach (DatasetMetadata oldMetaData in oldDatasets)
                {
                    oldNameSet.Add(oldMetaData.DatasetName);
                }
                foreach (DatasetMetadata newMetaData in newDatasets)
                {
                    newNameSet.Add(newMetaData.DatasetName);
                }
                oldNameSet.IntersectWith(newNameSet);
            }
            return oldNameSet;
        }
#endregion