/**
* Attempts to cast a given INode into an Aggregation.
* Resources that have an aggregation type as their rdf:type
* are recognized as well-formed aggregations.
* @param resource the INode to cast
* @return the Aggregation or null if INode is not a well-formed aggregation
*/
public static IAggregation asAggregation(IResource resource)
{
if (resource == null)
{
return(null);
}
IEnumerator <IResource> it = resource.getObjects(RDF.PropertyType).GetEnumerator();
//JenaUtil.setGraphReadOptimization(true);
try
{
while (it.MoveNext())
{
IResource type = it.Current;
if (type.isUri())
{
if (Aggregations.getName((IResource)type) != null)
{
it.Dispose();
return(new AggregationImpl(resource, resource.getModel()));
}
}
}
}
finally
{
//JenaUtil.setGraphReadOptimization(false);
}
return(null);
}
override public void Print(ISparqlPrinter p)
{
IVariable asVar = getAs();
if (asVar != null)
{
p.print("(");
}
INode aggType = this.getObject(RDF.PropertyType);
String aggName = Aggregations.getName(aggType);
p.printKeyword(aggName);
p.print("(");
if (isDistinct())
{
p.print("DISTINCT ");
}
Triple exprS = this.getProperty(SP.PropertyExpression);
if (exprS != null && !(exprS.Object is ILiteralNode))
{
IResource r = Resource.Get(exprS.Object, getModel());
IResource expr = SPINFactory.asExpression(r);
if (expr is IPrintable)
{
((IPrintable)expr).Print(p);
}
else
{
p.printURIResource(r);
}
}
else
{
p.print("*");
}
String separator = getString(SP.PropertySeparator);
if (separator != null)
{
p.print("; ");
p.printKeyword("SEPARATOR");
p.print("=''"); //"='" + DatasetUtil.escapeString(separator) + "'");
}
if (asVar != null)
{
p.print(") ");
p.printKeyword("AS");
p.print(" ");
p.print(asVar.ToString());
}
p.print(")");
}
