@Override
        public void storeState(final Configuration configuration) {
            VertexProgram.super.storeState(configuration);
            configuration.setProperty(DIRECTION_CFG_KEY, direction.name());
        }
Clones this vertex program.

@return a clone of this vertex program
gremlin-test/src/main/java/org/apache/tinkerpop/gremlin/process/computer/GraphComputerTest.java