/**
* Return true if this composite <code>Job</code> is a tree.
*
* @param visited a set of visited exertions
* @return true if this <code>Job</code> composite is a tree
* @see sorcer.service.Exertion#isTree()
*/
public boolean isTree(Set visited) {
visited.add(this);
Iterator i = exertions.iterator();
while (i.hasNext()) {
ServiceExertion e = (ServiceExertion) i.next();
if (visited.contains(e) || !e.isTree(visited)) {
return false;
}
}
return true;
}
