How to use

ElementVisitorBase

in

org.apache.jena.sparql.syntax

private RecursiveElementVisitor() { this.visitor = new ElementVisitorBase() ; }

  /** The primitive operation to apply a transformation to an Op */
  protected Element applyTransformation(ApplyTransformVisitor transformApply, Element element,
                     ElementVisitor beforeVisitor, ElementVisitor afterVisitor) {
//        ElementWalker.walk(element, transformApply) ; // , beforeVisitor,
//                                                      // afterVisitor) ;
    beforeVisitor = beforeVisitor == null ? new ElementVisitorBase() : beforeVisitor;
    afterVisitor = afterVisitor == null ? new ElementVisitorBase() : afterVisitor;

    ElementWalker.walk(element, transformApply, beforeVisitor, afterVisitor);
    Element r = transformApply.result() ;
    return r ;
  }

public static Set<Triple> getTriplePatterns(Query query){
  final Set<Triple> triplePatterns = Sets.newHashSet();
  
  ElementWalker.walk(query.getQueryPattern(), new ElementVisitorBase(){
    @Override
    public void visit(ElementTriplesBlock el) {
      Iterator<Triple> triples = el.patternElts();
      while (triples.hasNext()) {
        Triple triple = triples.next();
        triplePatterns.add(triple);
      }
    }
    
    @Override
    public void visit(ElementPathBlock el) {
      Iterator<TriplePath> triplePaths = el.patternElts();
      while (triplePaths.hasNext()) {
        TriplePath tp = triplePaths.next();
        if(tp.isTriple()) {
          Triple triple = tp.asTriple();
          triplePatterns.add(triple);
        }
      }
    }
  });
  return triplePatterns;
}

final Set<Var> vars = new HashSet<>();
ElementWalker.walk(query.getQueryPattern(), new ElementVisitorBase(){
  @Override
  public void visit(ElementTriplesBlock el) {

ElementVisitor elementVisitor = new RecursiveElementVisitor(new ElementVisitorBase()) {

ElementVisitor elementVisitor = new RecursiveElementVisitor(new ElementVisitorBase()) {

final Set<Triple> outgoingTriples = Sets.newHashSet();
ElementWalker.walk(query.getQueryPattern(), new ElementVisitorBase(){
  @Override
  public void visit(ElementTriplesBlock el) {

final Set<Triple> outgoingTriples = Sets.newHashSet();
ElementWalker.walk(query.getQueryPattern(), new ElementVisitorBase(){
  @Override
  public void visit(ElementTriplesBlock el) {