private void BuildJoinNode(ReteBuilderContext context, IEnumerable <ConditionElement> conditions = null)
{
var betaConditions = new List <IBetaCondition>();
if (conditions != null)
{
foreach (var condition in conditions)
{
var betaCondition = ExpressionCompiler.CompileBetaCondition(condition, context.Declarations);
betaConditions.Add(betaCondition);
}
}
var node = context.BetaSource
.Sinks.OfType <JoinNode>()
.FirstOrDefault(x =>
x.RightSource == context.AlphaSource &&
x.LeftSource == context.BetaSource &&
ConditionComparer.AreEqual(x.Conditions, betaConditions));
if (node == null)
{
node = new JoinNode(context.BetaSource, context.AlphaSource, context.HasSubnet);
if (context.HasSubnet)
{
node.Conditions.Insert(0, new SubnetCondition());
}
foreach (var betaCondition in betaConditions)
{
node.Conditions.Add(betaCondition);
}
}
BuildBetaMemoryNode(context, node);
context.ResetAlphaSource();
}