Ejemplo n.º 1
0
        private void AddDocumentToPriorityNode(Document doc, int priority)
        {
            if (priority > 9 || priority < 0)
                throw new ArgumentException("Priority must be between 0 and 9");

            if (priorityNodes[priority].Value == null)
            {
                --priority;
                if (priority >= 0)
                {
                    // check for the next lower priority
                    AddDocumentToPriorityNode(doc, priority);
                }
                else // now no priority node exists with the same priority or lower
                // add the new document to the end
                {
                    documentList.AddLast(doc);
                    priorityNodes[doc.Priority] = documentList.Last;
                }
                return;
            }
            else // a priority node exists
            {
                LinkedListNode<Document> prioNode = priorityNodes[priority];
                if (priority == doc.Priority)
                // priority node with the same priority exists
                {
                    documentList.AddAfter(prioNode, doc);

                    // set the priority node to the last document with the same priority
                    priorityNodes[doc.Priority] = prioNode.Next;
                }
                else // only priority node with a lower priority exists
                {
                    // get the first node of the lower priority
                    LinkedListNode<Document> firstPrioNode = prioNode;

                    while (firstPrioNode.Previous != null &&
                       firstPrioNode.Previous.Value.Priority == prioNode.Value.Priority)
                    {
                        firstPrioNode = prioNode.Previous;
                        prioNode = firstPrioNode;
                    }

                    documentList.AddBefore(firstPrioNode, doc);

                    // set the priority node to the new value
                    priorityNodes[doc.Priority] = firstPrioNode.Previous;
                }
            }
        }
Ejemplo n.º 2
0
 public void AddDocument(Document d)
 {
     if (d == null) throw new ArgumentNullException("d");
     AddDocumentToPriorityNode(d, d.Priority);
 }