/*
* Alter NavigationNodeLinks by removing the NavigationLinks following the rule dictated by p_navigationLinkAlterationMethod (see ENavigationLinkRemovalMethod for more).
*/
public static void removeNavigationLinks(NavigationGraph p_navigationGraph, ENavigationLinkAlterationMethod p_navigationLinkAlterationMethod, NavigationNode p_involvedNode)
{
switch (p_navigationLinkAlterationMethod)
{
case ENavigationLinkAlterationMethod.TO:
// We have to :
// * gets NavigationLinks going to the p_involvedNode
// * clear NavigationLinks coming from NavigationNodes that goes to the p_involvedNode
// * clear NavigationLinks going to the p_involvedNode
List <NavigationLink> l_nodesToList = p_navigationGraph.NodeLinksIndexedByEndNode[p_involvedNode];
for (int i = 0; i < l_nodesToList.Count; i++)
{
NavigationLink l_linkTo = l_nodesToList[i];
List <NavigationLink> l_targetList = p_navigationGraph.NodeLinksIndexedByStartNode[l_linkTo.StartNode];
l_targetList.Remove(l_linkTo);
}
p_navigationGraph.NodeLinksIndexedByEndNode[p_involvedNode].Clear();
break;
}
}
/*
* Alter NavigationNodeLinks by restoring NavigationLinks following the rule dictated by p_navigationLinkAlterationMethod (see ENavigationLinkRemovalMethod for more).
* - NavigationNodeLinks are restored from the NavigationGraphSnapshot.
*/
public static void restoreNavigationLinksFromSnapshot(NavigationGraph p_navigationGraph, ENavigationLinkAlterationMethod p_navigationLinkAlterationMethod, NavigationNode p_involvedNode)
{
switch (p_navigationLinkAlterationMethod)
{
case ENavigationLinkAlterationMethod.TO:
// We have to :
// * copy NavigationLinks going to the p_involvedNode (retrieved from snapshot)
// * add NavigationLinks coming from NavigationNodes that goes to the p_involvedNode
List <NavigationLink> l_linksThatPointsTowardsInvolvedNode = p_navigationGraph.NodeLinksIndexedByEndNode[p_involvedNode];
l_linksThatPointsTowardsInvolvedNode.Clear();
l_linksThatPointsTowardsInvolvedNode.AddRange(p_navigationGraph.NavigationGraphSnapshot.NodeLinksIndexedByEndNode[p_involvedNode]);
for (int i = 0; i < l_linksThatPointsTowardsInvolvedNode.Count; i++)
{
NavigationLink l_linkTo = l_linksThatPointsTowardsInvolvedNode[i];
var l_linksFrom_snapshot_enumerator = p_navigationGraph.NavigationGraphSnapshot.NodeLinksIndexedByStartNode[l_linkTo.StartNode].GetEnumerator();
while (l_linksFrom_snapshot_enumerator.MoveNext())
{
NavigationLink l_referenceFromLink = l_linksFrom_snapshot_enumerator.Current;
if (l_referenceFromLink.EndNode == p_involvedNode)
{
p_navigationGraph.NodeLinksIndexedByStartNode[l_referenceFromLink.StartNode].Add(l_referenceFromLink);
}
}
}
break;
}
}
