Like all OsidLists, QueueConstrainerList provides a means for accessing QueueConstrainer elements sequentially either one at a time or many at a time. Examples:

while (qcl.hasNext()) {
     QueueConstrainer constrainer = qcl.getNextQueueConstrainer();
}

or

while (qcl.hasNext()) {
     QueueConstrainer[] constrainers = qcl.getNextQueueConstrainers(qcl.available());
}