How to use

org.openrdf.query.algebra.MultiProjection

constructor

private UnaryTupleOperator visitTemplates(Resource templates)
  throws OpenRDFException
{
  List<ProjectionElemList> projElemLists = new ArrayList<ProjectionElemList>();
  Iteration<? extends Resource, QueryEvaluationException> iter = Statements.listResources(templates,
      store);
  while (iter.hasNext()) {
    Resource r = iter.next();
    ProjectionElemList projElems = visitTemplate(r);
    projElemLists.add(projElems);
  }
  UnaryTupleOperator expr;
  if (projElemLists.size() > 1) {
    MultiProjection proj = new MultiProjection();
    proj.setProjections(projElemLists);
    expr = proj;
  }
  else {
    Projection proj = new Projection();
    proj.setProjectionElemList(projElemLists.get(0));
    expr = proj;
  }
  Reduced reduced = new Reduced();
  reduced.setArg(expr);
  tupleRoot = reduced;
  SingletonSet stub = new SingletonSet();
  expr.setArg(stub);
  tupleNode = stub;
  return expr;
}

  tuple = new Projection(tuple, projection);
}else if (!projectionElements.isEmpty()){
  tuple = new MultiProjection(tuple, projectionElements);

result = new MultiProjection(result, projList);

  tuple = new Projection(tuple, projection);
} else if (!projectionElements.isEmpty()) {
  tuple = new MultiProjection(tuple, projectionElements);

  tuple = new Projection(tuple, projection);
} else if (!projectionElements.isEmpty()) {
  tuple = new MultiProjection(tuple, projectionElements);

result = new MultiProjection(result, projections);

result = new MultiProjection(result, projections);

private UnaryTupleOperator multiProjection() {
  MultiProjection aProjection = new MultiProjection();