/// <summary>
/// visit a comparison expression
/// </summary>
/// <param name="context"></param>
/// <returns></returns>
public override Expression <Func <T, bool> > VisitComparison(QueryParser.ComparisonContext context)
{
var comparator = context.comparator().GetText().ToLowerInvariant();
switch (comparator)
{
case "=is-null=":
case "=nil=":
return(QueryExpressionHelper.GetIsNullExpression <T>(_parameter, context, _namingStrategy));
case "==":
case "=eq=":
return(QueryExpressionHelper.GetEqExpression <T>(_parameter, context, _namingStrategy));
case "!=":
case "=neq=":
return(QueryExpressionHelper.GetNeqExpression <T>(_parameter, context, _namingStrategy));
case "<":
case "=lt=":
return(QueryExpressionHelper.GetLtExpression <T>(_parameter, context, _namingStrategy));
case "<=":
case "=le=":
return(QueryExpressionHelper.GetLeExpression <T>(_parameter, context, _namingStrategy));
case ">":
case "=gt=":
return(QueryExpressionHelper.GetGtExpression <T>(_parameter, context, _namingStrategy));
case ">=":
case "=ge=":
return(QueryExpressionHelper.GetGeExpression <T>(_parameter, context, _namingStrategy));
case "=in=":
return(QueryExpressionHelper.GetInExpression <T>(_parameter, context, _namingStrategy));
case "=out=":
case "=nin=":
return(QueryExpressionHelper.GetOutExpression <T>(_parameter, context, _namingStrategy));
default:
throw new QueryComparisonUnknownComparatorException(context);
}
}
public QueryComparisonUnknownComparatorException(QueryParser.ComparisonContext origin,
Exception innerException = null) : base(origin,
string.Format("Unknown comparator : {0}", origin.comparator().GetText()), innerException)
{
}