/**
* Fetches all elements of the optional, i.e., of the OPTIONAL clause. query
*
* @param query Input query
* @return List of elements from the OPTIONAL clause if there is one, else null
*/
private static List<Element> getOptionalElements(Query query) {
ElementGroup elt = (ElementGroup) query.getQueryPattern();
for (int i = 0; i < elt.getElements().size(); i++) {
Element e = elt.getElements().get(i);
if (e instanceof ElementOptional) {
return ((ElementGroup) ((ElementOptional) e).getOptionalElement()).getElements();
}
}
return new ArrayList<Element>();
}
/**
* Fetches all elements of the query body, i.e., of the WHERE clause of a query
*
* @param query Input query
* @return List of elements from the WHERE clause
*/
private static List<Element> getWhereElements(Query query) {
List<Element> result = new ArrayList<Element>();
ElementGroup elt = (ElementGroup) query.getQueryPattern();
for (int i = 0; i < elt.getElements().size(); i++) {
Element e = elt.getElements().get(i);
if (!(e instanceof ElementOptional)) {
result.add(e);
}
}
return result;
}
/* @see com.hp.hpl.jena.sparql.syntax.ElementVisitorBase#visit(com.hp.hpl.jena.sparql.syntax.ElementGroup) */
@Override
public void visit(final ElementGroup elementgroup) {
for (final Element e : elementgroup.getElements()) {
e.visit(this);
}
}