What the fuck does this method do? Java puzzle #2 at work

WTF.java

/**
 * Retrieves all descendants in breadth-first enumeration.
 * Ordering for a particular level is undetermined.
 */
public List<Folder> getDescendants() {
	List<Folder> folders = new ArrayList<Folder>(getChildren());
	int i = 0;
	while(i < folders.size()) {
		Folder folder = folders.get(i);
		folders.addAll(folder.getChildren());
		i++;
	}
	return folders;
}