in src/main/java/org/apache/maven/shared/dependency/graph/traversal/BuildingDependencyNodeVisitor.java [107:116]
public boolean endVisit(DependencyNode node) {
parentNodes.pop();
// apply the visitor to the resultant tree on the last visit
if (parentNodes.empty() && visitor != null) {
rootNode.accept(visitor);
}
return true;
}