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

import java.awt.event.ActionEvent;
import java.util.Iterator;

import javax.swing.Action;

import org.argouml.application.helpers.ResourceLoaderWrapper;
import org.argouml.i18n.Translator;
import org.argouml.ui.targetmanager.TargetManager;
import org.tigris.gef.undo.UndoableAction;

/**
 * This class adds the common algorithms
 * for handling multiple targets
 * for a radio menuitem to the UMLAction.
 *
 * @author mvw@tigris.org
 */
abstract class AbstractActionRadioMenuItem extends UndoableAction {

    /**
     * @param key the name to be localized
     * @param hasIcon true if an icon should be shown
     */
    public AbstractActionRadioMenuItem(String key, boolean hasIcon) {
        super(Translator.localize(key),
        		hasIcon ? ResourceLoaderWrapper.lookupIcon(key) : null);
        // Set the tooltip string:
        putValue(Action.SHORT_DESCRIPTION, 
                Translator.localize(key));
    }

    /**
     * This action should be enabled when: <ul>
     * <li>all targets are modelelements that support this radiobutton and
     * <li>all targets have the radiobutton on the same item
     *     (mixed is not yet supported, but could be if a tri-state
     *     radiobutton is implemented).
     * </ul>
     */
    public boolean isEnabled() {
        boolean result = true;
        Object commonValue = null; // only initialized to prevent warning
        boolean first = true;
        Iterator i = TargetManager.getInstance().getTargets().iterator();
        while (i.hasNext() && result) {
            Object t = i.next();
            try {
                Object value = valueOfTarget(t);
                if (first) {
                    commonValue = value;
                    first = false;
                }
                result &= commonValue.equals(value);
            } catch (IllegalArgumentException e) {
                result = false; //not supported for this target
            }
        }
        return result;
    }

    /**
     * @param t the target modelelement
     * @return the UML element that represents the radiobutton
     *         for this modelelement
     */
    abstract Object valueOfTarget(Object t);

    /**
     * This action is performed on ALL targets.
     *
     * @see java.awt.event.ActionListener#actionPerformed(java.awt.event.ActionEvent)
     */
    public final void actionPerformed(ActionEvent e) {
        super.actionPerformed(e);
        Iterator i = TargetManager.getInstance().getTargets().iterator();
        while (i.hasNext()) {
            Object t = i.next();
            toggleValueOfTarget(t);
        }
    }

    /**
     * @param t the target modelelement
     */
    abstract void toggleValueOfTarget(Object t);
}

