@Override
    public TraverserGenerator getTraverserGenerator() {
        return null == this.bypassTraversal ? B_O_TraverserGenerator.instance() : this.bypassTraversal.getTraverserGenerator();
    }
@author Marko A. Rodriguez (http://markorodriguez.com)
gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/process/traversal/lambda/AbstractLambdaTraversal.java