public OrderByField(string name, OrderByFieldType orderingType, bool ascending, MethodType?method = null, Argument[] arguments = null)
{
Method = method;
Name = name;
OrderingType = orderingType;
Ascending = ascending;
Arguments = arguments;
}
public OrderByField(QueryFieldName name, OrderByFieldType orderingType, bool ascending, MethodType?method = null, Argument[] arguments = null)
{
Method = method;
Name = name;
OrderingType = orderingType;
Ascending = ascending;
Arguments = arguments;
AggregationOperation = AggregationOperation.None;
}
private List <(QueryExpression Expression, OrderByFieldType OrderingType, bool Ascending)> OrderBy()
{
var orderBy = new List <(QueryExpression Expression, OrderByFieldType OrderingType, bool Ascending)>();
do
{
if (Field(out var field) == false)
{
ThrowParseException("Unable to get field for ORDER BY");
}
OrderByFieldType type = OrderByFieldType.Implicit;
QueryExpression op;
if (Scanner.TryScan('('))
{
if (Method(field, out op) == false)
{
ThrowParseException($"Unable to parse method call {QueryExpression.Extract(Scanner.Input, field)}for ORDER BY");
}
}
else
{
op = new QueryExpression
{
Field = field,
Type = OperatorType.Field
};
}
if (Scanner.TryScan("AS") && Scanner.TryScan(OrderByAsOptions, out var asMatch))
{
switch (asMatch)
{
case "string":
type = OrderByFieldType.String;
break;
case "long":
type = OrderByFieldType.Long;
break;
case "double":
type = OrderByFieldType.Double;
break;
case "alphaNumeric":
type = OrderByFieldType.AlphaNumeric;
break;
}
}
var asc = true;
if (Scanner.TryScan(OrderByOptions, out var match))
{
if (match == "DESC" || match == "DESCENDING")
{
asc = false;
}
}
orderBy.Add((op, type, asc));
if (Scanner.TryScan(",") == false)
{
break;
}
} while (true);
return(orderBy);
}
