protected void DownHeap()
{
int i = 0;
while (i <= (Size - 1) / 2)
{
PriorityQueueNode <T> node = heap[i];
PriorityQueueNode <T> biggerChild = GetBiggerChild(GetChildren(i));
if (biggerChild == null)
{
break;
}
if (comparator(biggerChild.Priority, node.Priority))
{
Swap(biggerChild.Index, node.Index);
i = node.Index;
}
else
{
break;
}
}
}
public virtual void Add(T item, float priority)
{
Size++;
PriorityQueueNode <T> newNode = new PriorityQueueNode <T>(item, priority, Size - 1);
heap.Add(newNode);
newNode.Index = heap.IndexOf(newNode);
if (Size >= 2)
{
Upheap();
}
}
public void Reverse()
{
for (int i = 0; i < Size; i++)
{
if (i >= Size - 1 - i)
{
break;
}
PriorityQueueNode <T> temp = heap[i];
heap[i] = heap[Size - 1 - i];
heap[Size - 1 - i] = temp;
}
}
public virtual PriorityQueueNode <T> SearchNode(T item)
{
PriorityQueueNode <T> searchResult = null;
foreach (PriorityQueueNode <T> node in heap)
{
if (node.Item.Equals(item))
{
searchResult = node;
break;
}
}
return(searchResult);
}
protected PriorityQueueNode <T> GetBiggerChild(List <PriorityQueueNode <T> > children)
{
PriorityQueueNode <T> biggerChild = null;
if (children.Count == 1)
{
biggerChild = children[0];
}
if (children.Count == 2)
{
biggerChild = (comparator(children[0].Priority, children[1].Priority))? children[0] : children[1];
}
return(biggerChild);
}
protected void BottomUp()
{
for (int i = Size / 2 - 1; i >= 0; i++)
{
PriorityQueueNode <T> father = heap[i];
List <PriorityQueueNode <T> > children = GetChildren(i);
PriorityQueueNode <T> biggerChild = GetBiggerChild(children);
if (comparator(biggerChild.Priority, father.Priority))
{
Swap(biggerChild.Index, father.Index);
}
}
}
protected void Swap(int firstElementIntex, int secondElementIndex)
{
if (firstElementIntex < 0 || firstElementIntex >= Size)
{
Debug.Log("firstElementIntex: " + firstElementIntex + " out of range. Size is: " + Size);
}
if (secondElementIndex < 0 || secondElementIndex >= Size)
{
Debug.Log("secondElementIndex: " + secondElementIndex + " out of range");
}
PriorityQueueNode <T> firstElement = heap[firstElementIntex];
PriorityQueueNode <T> secondElement = heap[secondElementIndex];
heap[firstElementIntex] = secondElement;
heap[secondElementIndex] = firstElement;
firstElement.Index = secondElementIndex;
secondElement.Index = firstElementIntex;
}
public T Pop()
{
PriorityQueueNode <T> highestPriorityElement = heap[0];
if (Size >= 2)
{
heap[0] = heap[Size - 1];
heap[0].Index = 0;
heap.RemoveAt(Size - 1);
}
else
{
heap.RemoveAt(0);
}
Size--;
if (Size >= 2)
{
DownHeap();
}
return(highestPriorityElement.Item);
}
protected void Upheap()
{
int i = Size - 1;
while (i >= 0)
{
PriorityQueueNode <T> node = heap[i];
PriorityQueueNode <T> father = GetFather(node.Index);
if (comparator(node.Priority, father.Priority))
{
Swap(node.Index, father.Index);
i = node.Index;
}
else
{
break;
}
}
}
