public static boolean hasStartLabels(final Traverser.Admin<Object> traverser, final Traversal.Admin<Object, Object> traversal) {
            for (final String label : Helper.getStartLabels(traversal)) {
                if (!traverser.path().hasLabel(label))
                    return false;
            }
            return true;
        }
@author Marko A. Rodriguez (http://markorodriguez.com)
gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/process/traversal/step/map/MatchStep.java