/**
* Called when a change is made to a configuration node, such that its dependency graph
* <em>may</em> now be larger than it previously was, and the node should be visited.
*/
public void onMoreSelected(ConfigurationNode configuration) {
// Add to the end of the queue, so that we traverse the graph in breadth-wise order to pick up
// as many conflicts as
// possible before attempting to resolve them
if (queued.add(configuration)) {
queue.addLast(configuration);
}
}
/**
* Called when a change is made to a configuration node, such that its dependency graph
* <em>may</em> now be smaller than it previously was, and the node should be visited.
*/
public void onFewerSelected(ConfigurationNode configuration) {
// Add to the front of the queue, to flush out configurations that are no longer required.
if (queued.add(configuration)) {
queue.addFirst(configuration);
}
}
public ConfigurationNode pop() {
ConfigurationNode next = queue.removeFirst();
queued.remove(next);
return next;
}
public ConfigurationNode peek() {
return queue.isEmpty() ? null : queue.getFirst();
}