/* $Id: CrNoTransitions.java 17849 2010-01-12 19:50:34Z linus $
 *****************************************************************************
 * Copyright (c) 2009 Contributors - see below
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *    maurelio1234
 *****************************************************************************
 *
 * Some portions of this file was previously release using the BSD License:
 */

// Copyright (c) 1996-2007 The Regents of the University of California. All
// Rights Reserved. Permission to use, copy, modify, and distribute this
// software and its documentation without fee, and without a written
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package org.argouml.uml.cognitive.critics;

import java.util.Collection;
import java.util.HashSet;
import java.util.Set;

import org.argouml.cognitive.Critic;
import org.argouml.cognitive.Designer;
import org.argouml.model.Model;
import org.argouml.uml.cognitive.UMLDecision;

/**
 * A critic to detect when a state has no outgoing transitions.
 *
 * @author jrobbins
 */
public class CrNoTransitions extends CrUML {

    /**
     * Constructor.
     */
    public CrNoTransitions() {
        setupHeadAndDesc();
	addSupportedDecision(UMLDecision.STATE_MACHINES);
	setKnowledgeTypes(Critic.KT_COMPLETENESS);
	addTrigger("incoming");
	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 (!(Model.getFacade().isAStateVertex(dm))) {
	    return NO_PROBLEM;
	}
	Object sv = /*(MStateVertex)*/ dm;
	if (Model.getFacade().isAState(sv)) {
	    Object sm = Model.getFacade().getStateMachine(sv);
	    if (sm != null && Model.getFacade().getTop(sm) == sv) {
	        return NO_PROBLEM;
	    }
	}
	Collection outgoing = Model.getFacade().getOutgoings(sv);
	Collection incoming = Model.getFacade().getIncomings(sv);
	boolean needsOutgoing = outgoing == null || outgoing.size() == 0;
	boolean needsIncoming = incoming == null || incoming.size() == 0;
	if (Model.getFacade().isAPseudostate(sv)) {
	    Object k = Model.getFacade().getKind(sv);
	    if (k.equals(Model.getPseudostateKind().getChoice())) {
	        return NO_PROBLEM;
	    }
	    if (k.equals(Model.getPseudostateKind().getJunction())) {
	        return NO_PROBLEM;
	    }
	    if (k.equals(Model.getPseudostateKind().getInitial())) {
                needsIncoming = false;
            }
	}
	if (Model.getFacade().isAFinalState(sv)) {
	    needsOutgoing = false;
	}

	if (needsIncoming && needsOutgoing) {
	    return PROBLEM_FOUND;
	}
	return NO_PROBLEM;
    }

    /*
     * @see org.argouml.uml.cognitive.critics.CrUML#getCriticizedMetatypes()
     */
    public Set<Object> getCriticizedDesignMaterials() {
        Set<Object> ret = new HashSet<Object>();
        ret.add(Model.getMetaTypes().getStateVertex());
        return ret;
    }

}