/// <summary>Creates a key range containing all children of tuple, optionally including the tuple itself.</summary>
/// <param name="tuple">Tuple that is the prefix of all keys</param>
/// <param name="includePrefix">If true, the tuple key itself is included, if false only the children keys are included</param>
/// <returns>Range of all keys suffixed by the tuple. The tuple itself will be included if <paramref name="includePrefix"/> is true</returns>
public static KeyRange ToRange([NotNull] this ITuple tuple, bool includePrefix)
{
if (tuple == null)
{
throw new ArgumentNullException(nameof(tuple));
}
// We want to allocate only one byte[] to store both keys, and map both Slice to each chunk
// So we will serialize the tuple two times in the same writer
var writer = new TupleWriter();
tuple.PackTo(ref writer);
writer.Output.EnsureBytes(writer.Output.Position + 2);
if (!includePrefix)
{
writer.Output.WriteByte(0);
}
int p0 = writer.Output.Position;
tuple.PackTo(ref writer);
writer.Output.WriteByte(0xFF);
int p1 = writer.Output.Position;
return(new KeyRange(
new Slice(writer.Output.Buffer, 0, p0),
new Slice(writer.Output.Buffer, p0, p1 - p0)
));
}
public void PackTo(ref TupleWriter writer)
{
writer.Output.WriteBytes(m_prefix);
m_items.PackTo(ref writer);
}
