/// <summary>
/// Counts the results.
/// </summary>
/// <param name="context">Evaluation Context.</param>
/// <param name="bindingIDs">Binding IDs over which the Aggregate applies.</param>
/// <returns></returns>
public override IValuedNode Apply(SparqlEvaluationContext context, IEnumerable <int> bindingIDs)
{
int c;
HashSet <IValuedNode> values = new HashSet <IValuedNode>();
if (_varname != null)
{
// Ensure the COUNTed variable is in the Variables of the Results
if (!context.Binder.Variables.Contains(_varname))
{
throw new RdfQueryException("Cannot use the Variable " + _expr.ToString() + " in a COUNT Aggregate since the Variable does not occur in a Graph Pattern");
}
// Just Count the number of results where the variable is bound
VariableTerm varExpr = (VariableTerm)_expr;
foreach (int id in bindingIDs)
{
IValuedNode temp = varExpr.Evaluate(context, id);
if (temp != null)
{
values.Add(temp);
}
}
c = values.Count;
}
else
{
// Count the distinct non-null results
foreach (int id in bindingIDs)
{
try
{
IValuedNode temp = _expr.Evaluate(context, id);
if (temp != null)
{
values.Add(temp);
}
}
catch
{
// Ignore errors
}
}
c = values.Count;
}
return(new LongNode(null, c));
}
/// <summary>
/// Counts the results
/// </summary>
/// <param name="context">Evaluation Context</param>
/// <param name="bindingIDs">Binding IDs over which the Aggregate applies</param>
/// <returns></returns>
public override IValuedNode Apply(SparqlEvaluationContext context, IEnumerable <int> bindingIDs)
{
int c = 0;
if (this._varname != null)
{
//Ensure the COUNTed variable is in the Variables of the Results
if (!context.Binder.Variables.Contains(this._varname))
{
throw new RdfQueryException("Cannot use the Variable " + this._expr.ToString() + " in a COUNT Aggregate since the Variable does not occur in a Graph Pattern");
}
//Just Count the number of results where the variable is bound
VariableTerm varExpr = (VariableTerm)this._expr;
foreach (int id in bindingIDs)
{
if (varExpr.Evaluate(context, id) != null)
{
c++;
}
}
}
else
{
//Count the number of results where the result in not null/error
foreach (int id in bindingIDs)
{
try
{
if (this._expr.Evaluate(context, id) != null)
{
c++;
}
}
catch
{
//Ignore errors
}
}
}
return(new LongNode(null, c));
}
/// <summary>
/// Counts the results
/// </summary>
/// <param name="context">Evaluation Context</param>
/// <param name="bindingIDs">Binding IDs over which the Aggregate applies</param>
/// <returns></returns>
public override IValuedNode Apply(SparqlEvaluationContext context, IEnumerable <int> bindingIDs)
{
int c = 0;
if (this._varname != null)
{
//Just Count the number of results where the variable is bound
VariableTerm varExpr = (VariableTerm)this._expr;
foreach (int id in bindingIDs)
{
if (varExpr.Evaluate(context, id) != null)
{
c++;
}
}
}
else
{
//Count the number of results where the result in not null/error
foreach (int id in bindingIDs)
{
try
{
if (this._expr.Evaluate(context, id) != null)
{
c++;
}
}
catch
{
//Ignore errors
}
}
}
return(new LongNode(null, c));
}
