RiakIndex.cs

namespace CorrugatedIron.Models.MapReduce.Inputs
{
    public static class RiakIndex
    {
        private static string RiakKeysIndex = "$key";
        
        public static RiakIndexInput AllKeys(string bucket)
        {
            string first = "\u0000";
            string last = char.ConvertFromUtf32(0x10FFFF);
            return Keys(bucket, first, last);
        }

        public static RiakIndexInput Keys(string bucket, string start, string end) 
        {
            return new RiakBinIndexRangeInput(bucket, RiakKeysIndex, start, end);
        }
    }
}

StringExtensions.cs

namespace CorrugatedIron.Extensions
{
    public static class StringExtensions
    {
        private static List<string> magicStrings = new List<string> { "$key" };
        
        public static bool IsBinaryKey(this string value)
        {
            return magicStrings.Contains(value) || value.EndsWith(RiakConstants.IndexSuffix.Binary);
        }
    }
}