// $Id: CrInvalidJoin.java,v 1.9 2004/09/21 19:03:26 mvw Exp $
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// File: CrInvalidJoin.java
// Classes: CrInvalidJoin
// Original Author: jrobbins@ics.uci.edu
// $Id: CrInvalidJoin.java,v 1.9 2004/09/21 19:03:26 mvw Exp $

package org.argouml.uml.cognitive.critics;

import java.util.Collection;
import org.argouml.cognitive.Designer;
import org.argouml.model.ModelFacade;


/** A critic to detect when a join state has the wrong number of
 *  transitions.  Implements constraint [4] on MPseudostate in the UML
 *  Semantics v1.1, pp. 104. */


public class CrInvalidJoin extends CrUML {

    /**
     * The constructor.
     * 
     */
    public CrInvalidJoin() {
	setHeadline("Change Join Transitions");
	addSupportedDecision(CrUML.DEC_STATE_MACHINES);
	addTrigger("outgoing");
    }

    /**
     * @see org.argouml.uml.cognitive.critics.CrUML#predicate2(
     * java.lang.Object, org.argouml.cognitive.Designer)
     */
    public boolean predicate2(Object dm, Designer dsgr) {
	if (!(ModelFacade.isAPseudostate(dm))) return NO_PROBLEM;
	Object k = ModelFacade.getPseudostateKind(dm);
	if (!ModelFacade.
	    equalsPseudostateKind(k,
				  ModelFacade.JOIN_PSEUDOSTATEKIND))
	    return NO_PROBLEM;
	Collection outgoing = ModelFacade.getOutgoings(dm);
	Collection incoming = ModelFacade.getIncomings(dm);
	int nOutgoing = outgoing == null ? 0 : outgoing.size();
	int nIncoming = incoming == null ? 0 : incoming.size();
	if (nOutgoing > 1) return PROBLEM_FOUND;
	if (nIncoming == 1) return PROBLEM_FOUND;
	return NO_PROBLEM;
    }

} /* end class CrInvalidJoin */