Ptidej-v5.2-master/PADL Creator JavaFile (Eclipse) Tests/data/argouml/trunk/src_new/org/argouml/uml/diagram/ui/ActionNavigability.java
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package org.argouml.uml.diagram.ui;

import java.awt.event.ActionEvent;

import javax.swing.Action;

import org.argouml.i18n.Translator;
import org.argouml.model.Model;
import org.tigris.gef.undo.UndoableAction;

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

    /**
     * Enumeration constant for <code>STARTTOEND</code> navigability.
     */
    public static final int STARTTOEND = 1;

    /**
     * Enumeration constant for <code>ENDTOSTART</code> navigability.
     */
    public static final int ENDTOSTART = 2;

    /**
     * The actual navigability of this action.
     */
    private int nav = BIDIRECTIONAL;

    /**
     * The association start.
     */
    private Object assocStart;

    /**
     * The association end.
     */
    private Object assocEnd;

    /**
     * The <code>ActionNavigability</code> constructor.
     *
     * @param assocStart a <code>MAssociationEnd</code> object at the start
     * of an association.
     * @param assocEnd a <code>MAssociationEnd</code> object at the end of
     * an association.
     * @param nav the type of navigation required in the association
     * being either <ul> <li>BIDIRECTIONAL <li>STARTTOEND
     * <li>ENDTOSTART </ul>
     *
     * @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 =
            Model.getFacade().getName(Model.getFacade().getType(assocStart));
        String endName =
            Model.getFacade().getName(Model.getFacade().getType(assocEnd));

        if (startName == null || startName.length() == 0) {
            startName = Translator.localize("action.navigation.anon");
        }
        if (endName == null || endName.length() == 0) {
            endName = Translator.localize("action.navigation.anon");
        }

        if (nav == STARTTOEND) {
            return Translator.messageFormat(
                    "action.navigation.from-to",
                    new Object[] {
                        startName,
                        endName,
                    }
            );
        } else if (nav == ENDTOSTART) {
            return Translator.messageFormat(
                    "action.navigation.from-to",
                    new Object[] {
                        endName,
                        startName,
                    }
            );
        } else {
            return Translator.localize("action.navigation.bidirectional");
        }
    }

    /**
     * The constructor.
     *
     * @param label   the description as build in <code>getDescription</code>
     * @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, null);
        // Set the tooltip string:
        putValue(Action.SHORT_DESCRIPTION, label);

        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) {
    	super.actionPerformed(ae);
	Model.getCoreHelper().setNavigable(assocStart,
	        (nav == BIDIRECTIONAL || nav == ENDTOSTART));
        Model.getCoreHelper().setNavigable(assocEnd,
                (nav == BIDIRECTIONAL || nav == STARTTOEND));
    }

    /**
     * The is action is always enabled.
     *
     *@return always true (the action is always enabled)
     * @see org.tigris.gef.undo.UndoableAction#isEnabled()
     */
    public boolean isEnabled() {
	return true;
    }
} /* end class ActionNavigability */
