/// <summary> Remove a successor node
/// </summary>
/// <param name="">node
/// </param>
/// <param name="">engine
/// </param>
/// <param name="">mem
/// @throws AssertException
///
/// </param>
public virtual void removeSuccessorNode(BaseNode node, Rete engine, IWorkingMemory mem)
{
if (removeNode(node))
{
// we retract the memories first, before removing the node
IAlphaMemory alpha = (IAlphaMemory)mem.getAlphaMemory(this);
if (alpha.size() > 0)
{
IEnumerator itr = alpha.GetEnumerator();
while (itr.MoveNext())
{
if (node is BaseAlpha)
{
BaseAlpha next = (BaseAlpha)node;
next.retractFact((IFact)itr.Current, engine, mem);
}
else if (node is BaseJoin)
{
BaseJoin next = (BaseJoin)node;
next.retractRight((IFact)itr.Current, engine, mem);
}
}
}
}
}
/// <summary> method for propogating the retract
/// </summary>
/// <param name="">fact
/// </param>
/// <param name="">engine
///
/// </param>
protected internal virtual void propogateRetract(IFact fact, Rete engine, IWorkingMemory mem)
{
for (int idx = 0; idx < successorNodes.Length; idx++)
{
Object nNode = successorNodes[idx];
if (nNode is BaseAlpha)
{
BaseAlpha next = (BaseAlpha)nNode;
next.retractFact(fact, engine, mem);
}
else if (nNode is BaseJoin)
{
BaseJoin next = (BaseJoin)nNode;
// AlphaNodes always call retractRight in the
// BetaNode
next.retractRight(fact, engine, mem);
}
else if (nNode is TerminalNode)
{
Index inx = new Index(new IFact[] { fact });
((TerminalNode)nNode).retractFacts(inx, engine, mem);
}
}
}
