/** rewrites the subop of graph. */
@Override
public void visit(final OpGraph opGraph) {
if (LOG.isDebugEnabled()) {
LOG.debug("Starting visiting OpGraph");
}
final OpRewriter rewriter = new OpRewriter(securityEvaluator, opGraph.getNode());
opGraph.getSubOp().visit(rewriter);
addOp(new OpGraph(opGraph.getNode(), rewriter.getResult()));
}