protected override void VisitExists(ReteBuilderContext context, ExistsElement element)
{
BuildSubnet(context, element.ChildElements.Single());
var betaNode = new ExistsNode(context.BetaSource, context.AlphaSource);
if (context.HasSubnet)
{
betaNode.Conditions.Add(new SubnetCondition());
}
context.BetaSource = BuildBetaMemoryNode(context, betaNode);
context.ResetAlphaSource();
}
private void BuildExistsNode(ReteBuilderContext context, RuleElement element)
{
var node = context.AlphaSource
.Sinks.OfType <ExistsNode>()
.FirstOrDefault(x =>
x.RightSource == context.AlphaSource &&
x.LeftSource == context.BetaSource);
if (node == null)
{
node = new ExistsNode(context.BetaSource, context.AlphaSource);
}
node.NodeInfo.Add(context.Rule, element);
BuildBetaMemoryNode(context, node);
context.ResetAlphaSource();
}
private void BuildExistsNode(ReteBuilderContext context)
{
var node = context.AlphaSource
.Sinks.OfType <ExistsNode>()
.FirstOrDefault(x =>
x.RightSource == context.AlphaSource &&
x.LeftSource == context.BetaSource);
if (node == null)
{
node = new ExistsNode(context.BetaSource, context.AlphaSource);
if (context.HasSubnet)
{
node.Conditions.Insert(0, new SubnetCondition());
}
}
BuildBetaMemoryNode(context, node);
context.ResetAlphaSource();
}