public Traversal.Admin<S, E> getTraversal() {
        return this.traversal;
    }
A TraversalMatrix provides random, non-linear access to the steps of a traversal by their step id.
This is useful in situations where traversers becomes detached from their traversal (and step) and later need to be re-attached.
A classic use case is {@link TraversalVertexProgram} on {@link GraphComputer}.

@author Marko A. Rodriguez (http://markorodriguez.com)
gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/process/traversal/util/TraversalMatrix.java