// The goal of this class is to make the name of the currently firing
// rule available to that rule's RHS. Oh, the pain!

import jess.*;

public class CurrentRuleName implements JessListener
{
    private String m_name;

    // Only one of these objects should be created, ideally bound to a
    // global variable. The constructor will install the listener with
    // the engine it must have as an argument.
    public CurrentRuleName(Rete engine)
    {
	engine.addJessListener(this);
	engine.setEventMask(engine.getEventMask() |
			    JessEvent.DEFRULE_FIRED);
    }

    // The event handler will store the rule's name in this object,
    // making it available to JESS code.
    public void eventHappened(JessEvent je)
    {
	if (je.getType() == JessEvent.DEFRULE_FIRED)
	    m_name = ((Defrule) je.getObject()).getName();
    }

    // The bean-like method (not that this is intended to be used in
    // defclass, you understand).
    public String getName() { return m_name; }
}