public void beforeInsert(LinkedListToken insert)
{
if (insert.getPrev() != null)
{
throw new ArgumentException("beforeInsert(" + insert + ") : prev was not null");
}
if (insert.getNext() != null)
{
throw new ArgumentException("beforeInsert(" + insert + ") : next was not null");
}
insert.prev = prev;
insert.next = this;
if (prev != null)
{
prev.next = insert;
}
prev = insert;
}
public void afterInsert(LinkedListToken insert)
{
if (insert.getPrev() != null)
{
throw new ArgumentException("afterInsert(" + insert + ") : prev was not null");
}
if (insert.getNext() != null)
{
throw new ArgumentException("afterInsert(" + insert + ") : next was not null");
}
insert.next = next;
insert.prev = this;
if (next != null)
{
next.prev = insert;
}
next = insert;
}