Raven.Database.Indexing.RangeQueryParser.GetRangeQuery C# (CSharp) Method

		protected override Query GetRangeQuery(string field, string lower, string upper, bool inclusive)
		{
			if (lower == "NULL" || lower == "*")
				lower = null;
			if (upper == "NULL" || upper == "*")
				upper = null;

			if ( (lower == null || !NumericRangeValue.IsMatch(lower)) && (upper == null || !NumericRangeValue.IsMatch(upper)))
			{
				return NewRangeQuery(field, lower, upper, inclusive);
			}

			var from = NumberUtil.StringToNumber(lower);
			var to = NumberUtil.StringToNumber(upper);

			TypeCode numericType;

			if (from != null)
				numericType = Type.GetTypeCode(from.GetType());
			else if (to != null)
				numericType = Type.GetTypeCode(to.GetType());
			else
				numericType = TypeCode.Empty;

			switch (numericType)
			{
				case TypeCode.Int32:
				{
					return NumericRangeQuery.NewIntRange(field, (int)(from ?? Int32.MinValue), (int)(to ?? Int32.MaxValue), inclusive, inclusive);
				}
				case TypeCode.Int64:
				{
					return NumericRangeQuery.NewLongRange(field, (long)(from ?? Int64.MinValue), (long)(to ?? Int64.MaxValue), inclusive, inclusive);
				}
				case TypeCode.Double:
				{
					return NumericRangeQuery.NewDoubleRange(field, (double)(from ?? Double.MinValue), (double)(to ?? Double.MaxValue), inclusive, inclusive);
				}
				case TypeCode.Single:
				{
					return NumericRangeQuery.NewFloatRange(field, (float)(from ?? Single.MinValue), (float)(to ?? Single.MaxValue), inclusive, inclusive);
				}
				default:
				{
					return NewRangeQuery(field, lower, upper, inclusive);
				}
			}
		}