/// <summary>
/// Compiles the constraint.
/// </summary>
/// <param name="cnstr">The CNSTR.</param>
/// <param name="templ">The templ.</param>
/// <param name="rule">The rule.</param>
/// <param name="position">The position.</param>
/// <returns></returns>
public virtual BaseAlpha2 compileConstraint(PredicateConstraint cnstr, ITemplate templ, Rule.IRule rule, int position)
{
BaseAlpha2 current = null;
// for now we expect the user to write the predicate in this
// way (> ?bind value), where the binding is first. this
// needs to be updated so that we look at the order of the
// parameters and set the node appropriately
// we only create an AlphaNode if the predicate isn't
// joining 2 bindings.
if (!cnstr.PredicateJoin)
{
if (ConversionUtils.isPredicateOperatorCode(cnstr.FunctionName))
{
int oprCode = ConversionUtils.getOperatorCode(cnstr.FunctionName);
Slot sl = (Slot) templ.getSlot(cnstr.Name).Clone();
Object sval = ConversionUtils.convert(sl.ValueType, cnstr.Value);
sl.Value = sval;
// create the alphaNode
if (rule.RememberMatch)
{
current = new AlphaNode(engine.nextNodeId());
}
else
{
current = new NoMemANode(engine.nextNodeId());
}
current.Slot = sl;
current.Operator = oprCode;
current.incrementUseCount();
// we increment the node use count when when create a new
// AlphaNode for the LiteralConstraint
templ.getSlot(sl.Id).incrementNodeCount();
}
else
{
// the function isn't a built in predicate function that
// returns boolean true/false. We look up the function
IFunction f = engine.findFunction(cnstr.FunctionName);
if (f != null)
{
// we create the alphaNode if a function is found and
// the return type is either boolean primitive or object
if (f.ReturnType == Constants.BOOLEAN_PRIM_TYPE || f.ReturnType != Constants.BOOLEAN_OBJECT)
{
// TODO - need to implement it
}
else
{
// the function doesn't return boolean, so we have to notify
// the listeners the condition is not valid
CompileMessageEventArgs ce = new CompileMessageEventArgs(this, EventType.FUNCTION_INVALID);
ce.Message = INVALID_FUNCTION + " " + f.ReturnType; //$NON-NLS-1$
notifyListener(ce);
}
}
else
{
// we need to notify listeners the function wasn't found
CompileMessageEventArgs ce = new CompileMessageEventArgs(this, EventType.FUNCTION_NOT_FOUND);
ce.Message = FUNCTION_NOT_FOUND + " " + cnstr.FunctionName;
notifyListener(ce);
}
}
}
Binding bind = new Binding();
bind.VarName = cnstr.VariableName;
bind.LeftRow = position;
bind.LeftIndex = templ.getSlot(cnstr.Name).Id;
bind.RowDeclared = position;
// we only Add the binding to the map if it doesn't already exist
if (rule.getBinding(cnstr.VariableName) == null)
{
rule.addBinding(cnstr.VariableName, bind);
}
return current;
}
/// <summary>
/// method creates Bindings from the bound constraint and adds them to
/// the Rule.
/// </summary>
/// <param name="cnstr">The CNSTR.</param>
/// <param name="templ">The templ.</param>
/// <param name="rule">The rule.</param>
/// <param name="position">The position.</param>
/// <returns></returns>
public virtual BaseAlpha2 compileConstraint(BoundConstraint cnstr, ITemplate templ, Rule.IRule rule, int position)
{
BaseAlpha2 current = null;
if (rule.getBinding(cnstr.VariableName) == null)
{
// if the HashMap doesn't already contain the binding, we create
// a new one
if (cnstr.IsObjectBinding)
{
Binding bind = new Binding();
bind.VarName = cnstr.VariableName;
bind.LeftRow = position;
bind.LeftIndex = - 1;
bind.IsObjectVar = true;
rule.addBinding(cnstr.VariableName, bind);
}
else
{
Binding bind = new Binding();
bind.VarName = cnstr.VariableName;
bind.LeftRow = position;
bind.LeftIndex = templ.getSlot(cnstr.Name).Id;
bind.RowDeclared = position;
cnstr.FirstDeclaration = true;
rule.addBinding(cnstr.VariableName, bind);
}
}
return current;
}