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 SetOwner(IDxfItemInternal item, IDxfItemInternal owner, bool isWriting)
{
if (item != null && owner != null)
{
if (isWriting && item is DxfEntity && !(owner is DxfDictionary))
{
// entities can only be parented by a dictionary
return;
}
item.SetOwner(owner);
var hasXData = item as IDxfHasXData;
if (hasXData != null)
{
var reactors = hasXData.ExtensionDataGroups.FirstOrDefault(e => e.GroupName == "ACAD_REACTORS");
if (reactors != null)
{
foreach (var pair in reactors.Items)
{
SetOwnerPair(pair, owner);
}
}
}
}
}
private static uint GetParentHandle(IDxfItemInternal parent, IDxfItemInternal child)
{
if (child is DxfEntity && !(parent is DxfDictionary))
{
// entities can only be parented by a dictionary
return(0u);
}
return(parent.Handle);
}
private static void SetChildOwners(IDxfItemInternal item, HashSet <IDxfItemInternal> visitedChildren)
{
foreach (var child in item.GetChildItems())
{
if (child != null && visitedChildren.Add(child))
{
SetOwner(child, item, isWriting: false);
SetChildOwners(child, visitedChildren);
}
}
}
private static void ClearPointers(IDxfItemInternal item, HashSet <IDxfItemInternal> visitedItems)
{
if (item != null && visitedItems.Add(item))
{
item.Handle = 0u;
foreach (var child in item.GetChildItems())
{
ClearPointers(child, visitedItems);
}
}
}
private static void GatherPointers(IDxfItemInternal item, Dictionary <uint, IDxfItemInternal> handleMap, HashSet <IDxfItemInternal> visitedItems)
{
if (item != null && visitedItems.Add(item))
{
if (item.Handle != 0u)
{
handleMap[item.Handle] = item;
}
foreach (var child in item.GetChildItems())
{
GatherPointers(child, handleMap, visitedItems);
}
}
}
private static void SetOwnerPair(IDxfCodePairOrGroup codePairOrGroup, IDxfItemInternal owner)
{
if (codePairOrGroup.IsCodePair)
{
var pair = (DxfCodePair)codePairOrGroup;
if (pair.Code == 330)
{
pair.Value = DxfCommonConverters.UIntHandle(owner.Handle);
}
}
else
{
foreach (var item in ((DxfCodePairGroup)codePairOrGroup).Items)
{
SetOwnerPair(item, owner);
}
}
}
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);
}
}
}
}
