public void SelectVariable(SparqlVariable v)
{
if (SelectBuilder != null)
{
if (v != null && !SelectedVariables.Any(x => x.Name == v.Name))
{
SelectedVariables.Add(v);
}
}
else
{
string msg = "Cannot select variables with non-SELECT query type.";
throw new Exception(msg);
}
}
public override void OnSelectClauseVisited(Expression selector)
{
base.OnSelectClauseVisited(selector);
// If we are in the root query generator and have not yet selected the
// subject variable, set it from the given selector.
if (IsRoot && !SelectedVariables.Any())
{
SparqlVariable o = VariableGenerator.TryGetObjectVariable(selector);
if (o != null && !IsSelectedVariable(o))
{
SelectVariable(o);
}
}
}
public void BindSelectVariables()
{
IsBound = true;
if (SelectBuilder != null)
{
bool hasAggregate = SelectedVariables.Any(v => v.IsAggregate);
foreach (SparqlVariable v in SelectedVariables)
{
if (CoalescedVariables.ContainsKey(v))
{
SparqlExpression defaultValue = CoalescedVariables[v];
SelectBuilder.And(e => e.Coalesce(e.Variable(v.Name), defaultValue)).As(v.Name + '_');
}
else
{
SelectBuilder.And(v);
}
if (hasAggregate && !v.IsAggregate)
{
#if !NET35
SelectBuilder.GroupBy(v.Name);
#else
QueryBuilder.GroupBy(v.Name);
#endif
}
}
if (hasAggregate && !IsRoot)
{
#if !NET35
SelectBuilder.Distinct();
#else
QueryBuilder.Distinct();
#endif
}
}
}