/// <summary>
/// Constructs a $apply filter transformation.
/// E.g. $apply=filter(Amount gt 1)
/// </summary>
/// <param name="applyQueryOptionExpr">ApplyQueryOptionExpression expression</param>
/// <returns>A filter transformation</returns>
private string ConstructFilterTransformation(ApplyQueryOptionExpression applyQueryOptionExpr)
{
if (applyQueryOptionExpr.PredicateConjuncts.Count == 0)
{
return(string.Empty);
}
return("filter(" + this.ExpressionToString(applyQueryOptionExpr.GetPredicate(), /*inPath*/ false) + ")");
}
/// <summary>
/// ApplyQueryOptionExpression visit method.
/// </summary>
/// <param name="applyQueryOptionExpr">ApplyQueryOptionExpression expression to visit</param>
internal void VisitQueryOptionExpression(ApplyQueryOptionExpression applyQueryOptionExpr)
{
if (applyQueryOptionExpr.Aggregations.Count == 0)
{
return;
}
// E.g. filter(Amount gt 1)
string filterTransformation = ConstructFilterTransformation(applyQueryOptionExpr);
// E.g. aggregate(Prop with sum as SumProp, Prop with average as AverageProp)
string aggregateTransformation = ConstructAggregateTransformation(applyQueryOptionExpr.Aggregations);
string applyExpression = string.IsNullOrWhiteSpace(filterTransformation) ? string.Empty : filterTransformation + "/";
applyExpression += aggregateTransformation;
this.AddAsCachedQueryOption(UriHelper.DOLLARSIGN + UriHelper.OPTIONAPPLY, applyExpression);
}
