/// <summary>
/// Compares two Nodes for Numeric Ordering
/// </summary>
/// <param name="x">Node</param>
/// <param name="y">Node</param>
/// <param name="type">Numeric Type</param>
/// <returns></returns>
protected int NumericCompare(INode x, INode y, SparqlNumericType type)
{
if (x == null || y == null)
{
throw new RdfQueryException("Cannot evaluate numeric ordering when one or both arguments are Null");
}
if (type == SparqlNumericType.NaN)
{
throw new RdfQueryException("Cannot evaluate numeric ordering when the Numeric Type is NaN");
}
ILiteralNode a = (ILiteralNode)x;
ILiteralNode b = (ILiteralNode)y;
switch (type)
{
case SparqlNumericType.Decimal:
return(SparqlSpecsHelper.ToDecimal(a).CompareTo(SparqlSpecsHelper.ToDecimal(b)));
case SparqlNumericType.Double:
return(SparqlSpecsHelper.ToDouble(a).CompareTo(SparqlSpecsHelper.ToDouble(b)));
case SparqlNumericType.Float:
return(SparqlSpecsHelper.ToFloat(a).CompareTo(SparqlSpecsHelper.ToFloat(b)));
case SparqlNumericType.Integer:
return(SparqlSpecsHelper.ToInteger(a).CompareTo(SparqlSpecsHelper.ToInteger(b)));
default:
throw new RdfQueryException("Cannot evaluate numeric equality since of the arguments is not numeric");
}
}
