private static DynamoDBEntryType GetType(string attributeType)
{
if (String.Equals(attributeType, "N"))
return DynamoDBEntryType.Numeric;
if (String.Equals(attributeType, "S"))
return DynamoDBEntryType.String;
if (String.Equals(attributeType, "B"))
return DynamoDBEntryType.Binary;
throw new InvalidOperationException("Unknown attribute type");
}