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// $Id: ActionNavigability.java,v 1.4 2004/08/14 19:28:19 mvw Exp $
// Copyright (c) 1996-2001 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.

package org.argouml.uml.diagram.ui;

import java.awt.event.*;
import org.argouml.model.ModelFacade;
import org.argouml.uml.ui.UMLAction;

/**
 * A class to perform the action of changing the unidirectional or
 * bidirectional navigation of an association.
 *
 * @author  Bob Tarling
 */
public class ActionNavigability extends UMLAction {
    /**
     * Enumeration constant for BIDIRECTIONAL navigability.
     */
    public static final int BIDIRECTIONAL = 0;
    
    /**
     * Enumeration constant for STARTTOEND navigability.
     */
    public static final int STARTTOEND = 1;
    
    /**
     * Enumeration constant for ENDTOSTART navigability.
     */
    public static final int ENDTOSTART = 2;

    private int nav = BIDIRECTIONAL;
    private Object assocStart = null;
    private Object assocEnd = null;

    /**
     * The ActionNavigability constructor.
     *
     * @param assocStart a MAssociationEnd object at the start
     * of an association.
     * @param assocEnd a MAssociationEnd object at the end of
     * an association.
     * @param nav the type of navigation required in the association
     * being either 
  • BIDIRECTIONAL
  • STARTTOEND *
  • ENDTOSTART
* * @return the constructed class */ public static ActionNavigability newActionNavigability(Object assocStart, Object assocEnd, int nav) { return new ActionNavigability(getDescription(assocStart, assocEnd, nav), assocStart, assocEnd, nav); } /** * Build a description string from the given association ends, * and the navigability. * * @param assocStart association end 1 * @param assocEnd association end 2 * @param nav the navigability * @return the string containing a human-readible indication * of the navigability */ private static String getDescription(Object assocStart, Object assocEnd, int nav) { String startName = ModelFacade.getName(ModelFacade.getType(assocStart)); String endName = ModelFacade.getName(ModelFacade.getType(assocEnd)); if (startName == null || startName.length() == 0) startName = "anon"; if (endName == null || endName.length() == 0) endName = "anon"; if (nav == STARTTOEND) { return startName + " to " + endName; } else if (nav == ENDTOSTART) { return endName + " to " + startName; } else { return "Bidirectional"; } } /** * The constructor. * * @param label the description as build in getDescription * @param theAssociationStart association end 1 * @param theAssociationEnd association end 2 * @param theNavigability the navigability: one of * BIDIRECTIONAL, STARTTOEND, ENDTOSTART */ protected ActionNavigability(String label, Object theAssociationStart, Object theAssociationEnd, int theNavigability) { super(label, NO_ICON); this.nav = theNavigability; this.assocStart = theAssociationStart; this.assocEnd = theAssociationEnd; } /** * To perform the action of changing navigability. * * @see java.awt.event.ActionListener#actionPerformed(java.awt.event.ActionEvent) */ public void actionPerformed(ActionEvent ae) { ModelFacade.setNavigable(assocStart, (nav == BIDIRECTIONAL || nav == ENDTOSTART)); ModelFacade.setNavigable(assocEnd, (nav == BIDIRECTIONAL || nav == STARTTOEND)); } /** * The is action is always enabled. * * @see org.argouml.uml.ui.UMLAction#shouldBeEnabled() */ public boolean shouldBeEnabled() { return true; } } /* end class ActionNavigability */
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