I am trying to get familiar with traversals algorithms implementations in Neo4j and to practice I am implementing classic graph algorithms (not judging if is the best approach or not, just for the sake of practising).

I implemented this find dense nodes class, but i am not completely happy with it, I feel it can be improved but I don't know how.

public class DenseNodesTraverser {

    private GraphDatabaseService db;

    private Log logger;

    public DenseNodesTraverser(GraphDatabaseService db, Log logger) {
        this.db = db;
        this.logger = logger;

    public List<Node> traverse(Node node) {
        DenseNodeEvaluator eval = new DenseNodeEvaluator();
        Traverser traverser =

        for (Path current : traverser) {
            System.out.println("Path " + current);
        return eval.getDenseNodes();

    private class DenseNodeEvaluator implements Evaluator {

        List<Node> denseNodes = new ArrayList<>();

        public Evaluation evaluate(Path path) {
            Node lastNode = path.endNode();

            int numberOfRelationships = Iterators.size(lastNode.getRelationships().iterator());

            if (numberOfRelationships >= 3) {

            return Evaluation.INCLUDE_AND_CONTINUE;

        public List<Node> getDenseNodes() {
            return denseNodes;




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