internal static List <string> GetTargetedReferenceTypes(this Criterium chainCriterium, string resourceType)
{
if (chainCriterium.Type != Operator.CHAIN)
{
throw new ArgumentException("Targeted reference types are only relevent for chained criteria.");
}
var critSp = chainCriterium.FindSearchParamDefinition(resourceType);
var modifier = chainCriterium.Modifier;
var nextInChain = (Criterium)chainCriterium.Operand;
var nextParameter = nextInChain.ParamName;
// The modifier contains the type of resource that the referenced resource must be. It is optional.
// If not present, search all possible types of resources allowed at this reference.
// If it is present, it should be of one of the possible types.
var searchResourceTypes = GetTargetedReferenceTypes(critSp, modifier);
// Afterwards, filter on the types that actually have the requested searchparameter.
return(searchResourceTypes.Where(rt => InternalField.All.Contains(nextParameter) || ModelInfo.SearchParameters.Exists(sp => rt.Equals(sp.Resource) && nextParameter.Equals(sp.Name))).ToList());
}
