public String toDebugString() {
        StringBuilder ret = new StringBuilder("Route(hops = { ");
        for (int i = 0; i < hops.size(); ++i) {
            ret.append(hops.get(i).toDebugString());
            if (i < hops.size() - 1) {
                ret.append(", ");
            }
        }
        ret.append(" })");
        return ret.toString();
    }
<p>Returns a string representation of this that can be debugged but not
parsed.</p>

@return The debug string.
messagebus/src/main/java/com/yahoo/messagebus/routing/Route.java