public static Optional<Computer> getComputer(final TraversalStrategies strategies) {
        final Optional<VertexProgramStrategy> optional = strategies.getStrategy(VertexProgramStrategy.class);
        return optional.isPresent() ? Optional.of(optional.get().computer) : Optional.empty();
    }
@author Marko A. Rodriguez (http://markorodriguez.com)
gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/process/computer/traversal/strategy/decoration/VertexProgramStrategy.java