/// <summary>Test if the start of current tuple is equal to another tuple</summary>
/// <param name="left">Larger tuple</param>
/// <param name="right">Smaller tuple</param>
/// <returns>True if the beginning of <paramref name="left"/> is equal to <paramref name="right"/> or if both tuples are identical</returns>
public static bool StartsWith([NotNull] this IFdbTuple left, [NotNull] IFdbTuple right)
{
if (left == null)
{
throw new ArgumentNullException("left");
}
if (right == null)
{
throw new ArgumentNullException("right");
}
//REVIEW: move this on IFdbTuple interface ?
return(FdbTuple.StartsWith(left, right));
}
/// <summary>Create a formatter that just add or remove a prefix to values</summary>
public static ITupleFormatter <T> CreateAppender(IFdbTuple prefix)
{
if (prefix == null)
{
throw new ArgumentNullException("prefix");
}
return(new FdbAnonymousTupleFormatter <T>(
(value) => prefix.Append <T>(value),
(tuple) =>
{
if (tuple.Count != prefix.Count + 1)
{
throw new ArgumentException("Tuple size is invalid", "tuple");
}
if (!FdbTuple.StartsWith(tuple, prefix))
{
throw new ArgumentException("Tuple does not start with the expected prefix", "tuple");
}
return tuple.Last <T>();
}
));
}