// and these solutions are projected to subject-predicate-object bindings.
// Finally, the spo-bindings are again filtered for duplicates.
if (distinct) {
// Create projection that removes all bindings that are not used in the
// constructor
ProjectionElemList projElemList = new ProjectionElemList();
for (Var var : constructVars) {
// Ignore anonymous and constant vars, these will be handled after
// the distinct
if (!var.isAnonymous() && !var.hasValue()) {
projElemList.addElement(new ProjectionElem(var.getName()));
}
}
result = new Projection(result, projElemList);
// Filter the duplicates from these projected bindings
result = new Distinct(result);
}
// Create BNodeGenerator's for all anonymous variables
Map<Var, ExtensionElem> extElemMap = new HashMap<Var, ExtensionElem>();
for (Var var : constructVars) {
if (var.isAnonymous() && !extElemMap.containsKey(var)) {
ValueExpr valueExpr = null;
if (var.hasValue()) {
valueExpr = new ValueConstant(var.getValue());
}
else if (explicit) {
// only generate bnodes in case of an explicit constructor
valueExpr = new BNodeGenerator();
}
if (valueExpr != null) {
extElemMap.put(var, new ExtensionElem(valueExpr, var.getName()));
}
}
}
if (!extElemMap.isEmpty()) {
result = new Extension(result, extElemMap.values());
}
// Create a Projection for each StatementPattern in the constructor
List<ProjectionElemList> projections = new ArrayList<ProjectionElemList>();
for (StatementPattern sp : statementPatterns) {
ProjectionElemList projElemList = new ProjectionElemList();
projElemList.addElement(new ProjectionElem(sp.getSubjectVar().getName(), "subject"));
projElemList.addElement(new ProjectionElem(sp.getPredicateVar().getName(), "predicate"));
projElemList.addElement(new ProjectionElem(sp.getObjectVar().getName(), "object"));
projections.add(projElemList);
}
if (projections.size() == 1) {