/**
* Returns the most specific Java instance for a given INode.
* If the node is an aggregation, it will be returned as instance of
* Aggregation.
* If the node is a function call, it will be returned as instance of
* FunctionCall.
* If it's a Variable, the Variable will be returned.
* Otherwise the node itself will be returned.
* @param node the node to cast
* @return node or node as a Function or Variable
*/
public static IResource asExpression(IResource resource)
{
if (resource == null)
{
return(null);
}
if (resource is INode)
{
IVariable var = SPINFactory.asVariable(resource);
if (var != null)
{
return(var);
}
IAggregation aggr = SPINFactory.asAggregation((IResource)resource);
if (aggr != null)
{
return(aggr);
}
IFunctionCall functionCall = SPINFactory.asFunctionCall((IResource)resource);
if (functionCall != null)
{
return(functionCall);
}
}
return(resource);
}
private void printOrderByExpression(ISparqlPrinter sb, IResource node)
{
// TODO check for real test
if (node is INode)
{
IResource resource = (IResource)node;
IFunctionCall call = SPINFactory.asFunctionCall(resource);
if (call != null)
{
sb.print("(");
ISparqlPrinter pc = sb.clone();
pc.setNested(true);
call.Print(pc);
sb.print(")");
return;
}
}
printNestedExpressionString(sb, node, true);
}
