/// <summary>
/// Formats a SPARQL GROUP BY Clause
/// </summary>
/// <param name="groupBy">GROUP BY Clause</param>
/// <returns></returns>
protected virtual String FormatGroupBy(ISparqlGroupBy groupBy)
{
StringBuilder output = new StringBuilder();
bool isAssignment = groupBy.AssignVariable != null && (groupBy.Expression.Variables.Count() != 1 || !groupBy.AssignVariable.Equals(groupBy.Expression.Variables.FirstOrDefault()));
if (isAssignment)
{
output.Append('(');
}
output.Append(this.FormatExpression(groupBy.Expression));
if (isAssignment)
{
output.Append(" AS ?");
output.Append(groupBy.AssignVariable);
output.Append(')');
}
if (groupBy.Child != null)
{
output.Append(' ');
output.Append(this.FormatGroupBy(groupBy.Child));
}
return(output.ToString());
}
private void BuildGroupByClauses(SparqlQuery query)
{
ISparqlGroupBy rootGroup = null;
ISparqlGroupBy lastGroup = null;
foreach (var buildGroup in _buildGroups)
{
if (rootGroup == null)
{
rootGroup = lastGroup = buildGroup(Prefixes);
}
else
{
lastGroup.Child = buildGroup(Prefixes);
}
}
query.GroupBy = rootGroup;
}
/// <summary>
/// Formats a SPARQL GROUP BY Clause
/// </summary>
/// <param name="groupBy">GROUP BY Clause</param>
/// <returns></returns>
protected virtual String FormatGroupBy(ISparqlGroupBy groupBy)
{
StringBuilder output = new StringBuilder();
if (groupBy.AssignVariable != null)
{
output.Append('(');
}
output.Append(this.FormatExpression(groupBy.Expression));
if (groupBy.AssignVariable != null)
{
output.Append(" AS ?");
output.Append(groupBy.AssignVariable);
output.Append(')');
}
if (groupBy.Child != null)
{
output.Append(' ');
output.Append(this.FormatGroupBy(groupBy.Child));
}
return(output.ToString());
}
/// <summary>
/// Creates a new Group By
/// </summary>
/// <param name="pattern">Pattern</param>
/// <param name="grouping">Grouping to use</param>
public GroupBy(ISparqlAlgebra pattern, ISparqlGroupBy grouping)
{
this._pattern = pattern;
this._grouping = grouping;
}
/// <summary>
/// Creates a new Group By
/// </summary>
/// <param name="pattern">Pattern</param>
/// <param name="grouping">Grouping to use</param>
public GroupBy(ISparqlAlgebra pattern, ISparqlGroupBy grouping)
{
this._pattern = pattern;
this._grouping = grouping;
}
/// <summary>
/// Formats a SPARQL GROUP BY Clause
/// </summary>
/// <param name="groupBy">GROUP BY Clause</param>
/// <returns></returns>
protected virtual String FormatGroupBy(ISparqlGroupBy groupBy)
{
StringBuilder output = new StringBuilder();
if (groupBy.AssignVariable != null)
{
output.Append('(');
}
output.Append(this.FormatExpression(groupBy.Expression));
if (groupBy.AssignVariable != null)
{
output.Append(" AS ?");
output.Append(groupBy.AssignVariable);
output.Append(')');
}
if (groupBy.Child != null)
{
output.Append(' ');
output.Append(this.FormatGroupBy(groupBy.Child));
}
return output.ToString();
}
/// <summary>
/// Creates a new Group By
/// </summary>
/// <param name="pattern">Pattern</param>
/// <param name="grouping">Grouping to use</param>
/// <param name="aggregates">Aggregates to calculate</param>
public GroupBy(ISparqlAlgebra pattern, ISparqlGroupBy grouping, IEnumerable <SparqlVariable> aggregates)
{
this._pattern = pattern;
this._grouping = grouping;
this._aggregates.AddRange(aggregates.Where(var => var.IsAggregate));
}
