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// $Id: CrNWayAgg.java,v 1.12 2004/09/21 19:03:27 mvw Exp $
// Copyright (c) 1996-2004 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
// agreement is hereby granted, provided that the above copyright notice
// and this paragraph appear in all copies.  This software program and
// documentation are copyrighted by The Regents of the University of
// California. The software program and documentation are supplied "AS
// IS", without any accompanying services from The Regents. The Regents
// does not warrant that the operation of the program will be
// uninterrupted or error-free. The end-user understands that the program
// was developed for research purposes and is advised not to rely
// exclusively on the program for any reason.  IN NO EVENT SHALL THE
// UNIVERSITY OF CALIFORNIA BE LIABLE TO ANY PARTY FOR DIRECT, INDIRECT,
// SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, INCLUDING LOST PROFITS,
// ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF
// THE UNIVERSITY OF CALIFORNIA HAS BEEN ADVISED OF THE POSSIBILITY OF
// SUCH DAMAGE. THE UNIVERSITY OF CALIFORNIA SPECIFICALLY DISCLAIMS ANY
// WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE
// PROVIDED HEREUNDER IS ON AN "AS IS" BASIS, AND THE UNIVERSITY OF
// CALIFORNIA HAS NO OBLIGATIONS TO PROVIDE MAINTENANCE, SUPPORT,
// UPDATES, ENHANCEMENTS, OR MODIFICATIONS.



// File: CrNWayAgg.java
// Classes: CrNWayAgg
// Original Author: jrobbins@ics.uci.edu
// $Id: CrNWayAgg.java,v 1.12 2004/09/21 19:03:27 mvw Exp $

// 12 Mar 2002: Jeremy Bennett (mail@jeremybennett.com). Code corrected as part
// of fix to issue 619.


package org.argouml.uml.cognitive.critics;

import java.util.Collection;
import java.util.Iterator;
import org.argouml.cognitive.Designer;
import org.argouml.cognitive.critics.Critic;
import org.argouml.model.ModelFacade;
/**
 * 

A critic to check that no end of a 3-way (or more) association is an * aggregation.

* *

This is the third well-formedness rule for associations in the UML 1.3 * standard (see section 2.5.3 of the standard).

* *

Note. This only applies to 3-way or more * associations. There is a separate critic (see {@link * org.argouml.uml.cognitive.critics.CrMultipleAgg}) which deals with * 2-way assocations.

* * @see * ArgoUML User Manual: Two Aggregate ends (roles) in binary * Association */ public class CrNWayAgg extends CrUML { /** *

Constructor for the critic.

* *

Sets up the resource name, which will allow headline and description * to found for the current locale. Provides a design issue category * (CONTAINMENT), a knowledge type (SEMANTICS) and add triggers for * "connection" and "end_aggregation".

*/ public CrNWayAgg() { setResource("CrNWayAgg"); addSupportedDecision(CrUML.DEC_CONTAINMENT); setKnowledgeTypes(Critic.KT_SEMANTICS); // These may not actually make any difference at present (the code // behind addTrigger needs more work). addTrigger("connection"); addTrigger("end_aggregation"); } /** *

The trigger for the critic.

* *

Check that the number of ends more than two, otherwise this should be * handled by the critic for 2-way assocations (see {@link * org.argouml.uml.cognitive.critics.CrMultipleAgg}).

* *

We do not handle association roles, which are a subclass of * association. An association role should be fine, if its parent is OK, * since it must be more tightly constrained than its parent.

* *

Note. ArgoUML does not currently have a constructor to check * that an association role is more tightly constrained than its * parent.

* *

Then loop through the ends, looking for aggregate ends. Note that we * look for aggregation explicitly, rather than just absence of "no * aggregation", so we don't trigger if the aggregation is just * undefined.

* * @param dm the {@link java.lang.Object Object} to be checked against * the critic. * * @param dsgr the {@link org.argouml.cognitive.Designer Designer} * creating the model. Not used, this is for future * development of ArgoUML. * * @return {@link #PROBLEM_FOUND PROBLEM_FOUND} if the critic is * triggered, otherwise {@link #NO_PROBLEM NO_PROBLEM}. */ public boolean predicate2(Object dm, Designer dsgr) { // Only work for associatins if (!(ModelFacade.isAAssociation(dm))) { return NO_PROBLEM; } // Get the assocations and connections. No problem (there is a separate // critic) if this is a binary association or is an association role. Object asc = /*(MAssociation)*/ dm; if (ModelFacade.isAAssociationRole(asc)) { return NO_PROBLEM; } Collection conns = ModelFacade.getConnections(asc); if ((conns == null) || (conns.size() <= 2)) { return NO_PROBLEM; } // Loop through the associations, looking for one with aggregation Iterator assocEnds = conns.iterator(); while (assocEnds.hasNext()) { Object ae = /*(MAssociationEnd)*/ assocEnds.next(); if (ModelFacade.isAggregate(ae) || ModelFacade.isComposite(ae)) { return PROBLEM_FOUND; } } // If drop out, we're OK return NO_PROBLEM; } } /* end class CrNWayAgg.java */
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