public String descendants(RequirementGraph<Project> graph) {
if (next != null && next.contains(requirement)) return "!";
if (requirement == null) return "";
Project prerequisite = getPrerequsiteEvenIfExpired();
if (prerequisite == null) return "";
Collection<Requirement<Project>> requirements = finder.getRequirements(prerequisite, graph);
return " "
+ requirement.rightArrow(now)
+ " "
+ prerequisite
+ new DescendantAncestry(now, first(requirements), finder, this).descendants(graph);
}
