/// <summary>
/// Compiles the joins.
/// </summary>
/// <param name="rule">The rule.</param>
public virtual void compileJoins(Rule.IRule rule)
{
ICondition[] conds = rule.Conditions;
BaseJoin prevJoinNode = null;
BaseJoin joinNode = null;
ICondition prevCE = null;
// only if there's more than 1 condition do we attempt to
// create the join nodes. A rule with just 1 condition has
// no joins
if (conds.Length > 1)
{
// previous Condition
prevCE = conds[0];
//this.compileFirstJoin(engine, memory); moved to the ConditionCompiler.compileFirstJoin method
prevCE.getCompiler(this).compileFirstJoin(prevCE, rule);
// now compile the remaining conditions
for (int idx = 1; idx < conds.Length; idx++)
{
ICondition cdt = conds[idx];
joinNode = cdt.getCompiler(this).compileJoin(cdt, idx, rule);
cdt.getCompiler(this).connectJoinNode(prevCE, cdt, prevJoinNode, joinNode);
// now we set the previous node to current
prevCE = cdt;
prevJoinNode = joinNode;
rule.addJoinNode(joinNode);
}
}
else if (conds.Length == 1)
{
conds[0].getCompiler(this).compileSingleCE(rule);
}
}
public override void compileSingleCE(Rule.IRule rule)
{
ICondition[] conds = rule.Conditions;
ObjectCondition oc = (ObjectCondition) conds[0];
if (oc.Negated)
{
// the ObjectCondition is negated, so we need to
// handle it appropriate. This means we need to
// Add a LIANode to _IntialFact and attach a NOTNode
// to the LIANode.
ObjectTypeNode otn = (ObjectTypeNode) ruleCompiler.Inputnodes.Get(ruleCompiler.Engine.InitFact);
LIANode lianode = ruleCompiler.findLIANode(otn);
NotJoin njoin = new NotJoin(ruleCompiler.Engine.nextNodeId());
njoin.Bindings = new Binding[0];
lianode.addSuccessorNode(njoin, ruleCompiler.Engine, ruleCompiler.Memory);
// Add the join to the rule object
rule.addJoinNode(njoin);
oc.LastNode.addSuccessorNode(njoin, ruleCompiler.Engine, ruleCompiler.Memory);
}
else if (oc.Nodes.Count == 0)
{
// this means the rule has a binding, but no conditions
ObjectTypeNode otn = ruleCompiler.findObjectTypeNode(oc.TemplateName);
LIANode lianode = new LIANode(ruleCompiler.Engine.nextNodeId());
otn.addSuccessorNode(lianode, ruleCompiler.Engine, ruleCompiler.Memory);
rule.Conditions[0].addNode(lianode);
}
}
public override void compileSingleCE(Rule.IRule rule)
{
ICondition[] conds = rule.Conditions;
ICondition condition = conds[0];
ExistCondition cond = (ExistCondition) condition;
BaseNode base_Renamed = cond.LastNode;
BaseJoin bjoin = new ExistJoinFrst(ruleCompiler.Engine.nextNodeId());
if (base_Renamed != null)
{
if (base_Renamed is BaseAlpha)
{
((BaseAlpha) base_Renamed).addSuccessorNode(bjoin, ruleCompiler.Engine, ruleCompiler.Memory);
}
else if (base_Renamed is BaseJoin)
{
((BaseJoin) base_Renamed).addSuccessorNode(bjoin, ruleCompiler.Engine, ruleCompiler.Memory);
}
}
else
{
// the rule doesn't have a literal constraint so we need to Add
// ExistJoinFrst as a child
ObjectTypeNode otn = ruleCompiler.findObjectTypeNode(cond.TemplateName);
otn.addSuccessorNode(bjoin, ruleCompiler.Engine, ruleCompiler.Memory);
}
// important, do not call this before ExistJoinFrst is added
// if it's called first, the List<Object> will return index
// out of bound, since there's nothing in the list
cond.addNode(bjoin);
rule.addJoinNode(bjoin);
}
