// $Id: CrNoTriggerOrGuard.java,v 1.11 2004/09/21 19:03:26 mvw Exp $
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// File: CrNoTriggerOrGuard.java
// Classes: CrNoTriggerOrGuard.java
// Original Author: jrobbins@ics.uci.edu
// $Id: CrNoTriggerOrGuard.java,v 1.11 2004/09/21 19:03:26 mvw Exp $

package org.argouml.uml.cognitive.critics;

import org.argouml.cognitive.Designer;
import org.argouml.cognitive.critics.Critic;
import org.argouml.model.ModelFacade;
/**
 * A critic that checks for missing trigger and/or guard.
 *
 */
public class CrNoTriggerOrGuard extends CrUML {

    /**
     * The constructor.
     * 
     */
    public CrNoTriggerOrGuard() {
	setHeadline("Add Trigger or Guard to Transistion");
	addSupportedDecision(CrUML.DEC_STATE_MACHINES);
	setKnowledgeTypes(Critic.KT_COMPLETENESS);
	addTrigger("trigger");
	addTrigger("guard");
    }

    /**
     * @see org.argouml.uml.cognitive.critics.CrUML#predicate2(
     * java.lang.Object, org.argouml.cognitive.Designer)
     */
    public boolean predicate2(Object dm, Designer dsgr) {
	if (!(ModelFacade.isATransition(dm))) return NO_PROBLEM;
	Object tr = /*(MTransition)*/ dm;
	Object/*MEvent*/ t = ModelFacade.getTrigger(tr);
	Object g = ModelFacade.getGuard(tr);
	Object sv = ModelFacade.getSource(tr);
	if (!(ModelFacade.isAState(sv))) return NO_PROBLEM;
	if (ModelFacade.getDoActivity(sv) != null) return NO_PROBLEM;
	boolean hasTrigger =
	    (t != null 
            && ModelFacade.getName(t) != null 
            && ModelFacade.getName(t).length() > 0);
	if (hasTrigger) return NO_PROBLEM;
	boolean noGuard = (g == null 
            || ModelFacade.getExpression(g) == null 
            || ModelFacade.getBody(ModelFacade.getExpression(g)) == null 
            || ModelFacade.getBody(ModelFacade.getExpression(g)).toString()
                                .length() == 0);
	if (noGuard) return PROBLEM_FOUND;
	return NO_PROBLEM;
    }

} /* end class CrNoTriggerOrGuard */