private static uint AssignHandles(IDxfItemInternal item, uint nextHandle, uint ownerHandle, HashSet <IDxfItemInternal> visitedItems)
{
if (item == null || !visitedItems.Add(item))
{
return(nextHandle);
}
Debug.Assert(item.Handle == 0u);
item.Handle = nextHandle++;
if (item.OwnerHandle == 0u && ownerHandle != 0u)
{
item.OwnerHandle = ownerHandle;
}
foreach (var child in item.GetPointers().Where(c => c.Item != null))
{
var childItem = (IDxfItemInternal)child.Item;
var parentHandle = GetParentHandle(item, childItem);
nextHandle = AssignHandles(childItem, nextHandle, parentHandle, visitedItems);
child.Handle = childItem.Handle;
childItem.OwnerHandle = parentHandle;
}
return(nextHandle);
}
private static void BindPointers(IDxfItemInternal item, Dictionary <uint, IDxfItemInternal> handleMap, HashSet <IDxfItemInternal> visitedItems, HashSet <IDxfItemInternal> visitedChildren)
{
if (visitedItems.Add(item))
{
// set initial owners
SetChildOwners(item, visitedChildren);
// set explicit owners
foreach (var child in item.GetPointers())
{
if (handleMap.ContainsKey(child.Handle))
{
child.Item = handleMap[child.Handle];
BindPointers((IDxfItemInternal)child.Item, handleMap, visitedItems, visitedChildren);
SetOwner((IDxfItemInternal)child.Item, item, isWriting: false);
}
}
}
}